Terms of Service

The following capitalised terms have the meanings set out below throughout these Terms:

Agreement

These Terms of Service together with any Order Form, the Privacy Policy, and any policies incorporated by reference.

API

The OrbitAlert application programming interface, including all endpoints, authentication mechanisms, and associated documentation.

API Key

A unique secret credential issued to the Customer that authenticates API requests.

Claim

Any claim, demand, action, proceeding, suit, loss, liability, damage, cost, or expense of any kind.

Customer

The individual or legal entity that has registered an account and agreed to these Terms.

Customer Data

Any data, configurations, or content that the Customer submits to or generates through the Service, including ground station coordinates, alert configurations, and Webhook endpoint URLs.

Documentation

The technical documentation, API reference, and usage guides published by OrbitAlert at orbitalert.net or otherwise made available to the Customer.

Fees

The amounts payable by the Customer for access to the Service as specified in the applicable Order Form or pricing page.

Force Majeure Event

Any event beyond a party's reasonable control, including natural disasters, war, pandemic, cyberattacks, government actions, internet infrastructure failures, or outages of third-party data providers.

Intellectual Property Rights

All patents, copyrights, trademarks, trade secrets, database rights, and all other proprietary rights.

Order Form

A written or electronic ordering document specifying the subscription plan, Fees, and billing terms.

Pass Prediction

A computed estimate of a satellite's visibility window over a specified ground location, including AOS, TCA, and LOS timestamps.

Service

The OrbitAlert satellite pass prediction and webhook notification platform, including the API, dashboard, and all related software, infrastructure, and documentation.

Service Credit

A monetary credit applied to future invoices as the sole remedy for certain SLA failures, as defined in Section 7.

SLA

The service level commitments defined in Section 7.

Subscription Term

The period for which a Customer has purchased access to the Service under an active Order Form or subscription.

TLE Data

Two-Line Element sets sourced from third-party public-domain databases, used as input to orbital propagation algorithms.

Webhook

An HTTP POST notification sent by the Service to a Customer-specified endpoint when a satellite pass event is imminent.

OrbitAlert provides a satellite pass prediction and notification Service. The Service applies SGP4/SDP4 orbital propagation to TLE Data sourced from publicly available databases (including Celestrak) to compute upcoming Pass Predictions for Earth-orbiting satellites. Predictions are delivered to Customer-specified Webhook endpoints and are accessible through the API. The Service also provides live space weather data (Kp index and geomagnetic storm warnings) sourced from the NOAA Space Weather Prediction Center.

Informational purpose only. The Service is provided for informational and operational planning purposes only. Pass Predictions are mathematical estimates subject to inherent uncertainties including TLE epoch age and decay, atmospheric drag, solar radiation pressure, unreported orbital manoeuvres, and algorithm approximations. OrbitAlert makes no warranty that any Pass Prediction will be accurate, complete, or suitable for any operational purpose. The Service must not be used as the sole basis for safety-critical decisions.

OrbitAlert is an actively maintained, continuously improved service. Current uptime and incident history are published publicly at orbitalert.net/status and orbitalert.net/sla. Formal Service Level commitments, where included in the Customer’s plan, are set out in Section 7; how changes to the Service are communicated is set out in Section 10.

Feedback the Customer chooses to provide may be incorporated into the Service without obligation or compensation (see Section 13).

By creating an account and each time the Customer accesses the Service, the Customer represents and warrants to OrbitAlert that:

• If entering into this Agreement on behalf of a legal entity, the Customer has full authority to bind that entity and its affiliates to these Terms.
• The Customer is not a minor and, if an individual, is at least 18 years of age.
• All registration information and billing details provided are accurate, current, and complete.
• The Customer is not: (a) located in, ordinarily resident in, or organised under the laws of any jurisdiction subject to a comprehensive trade embargo or economic sanctions by the EU, US, UN, or UK; (b) listed on any government denied-party, restricted, debarred, or sanctions list; or (c) 50% or more owned or controlled by any such person or entity.
• The Customer’s use of the Service will not violate any applicable law, regulation, or third-party right.
• The Customer has the legal right to operate any Webhook endpoint URL it registers with the Service.
• Any ground station for which the Customer registers alerts is operated in compliance with all applicable national and international radio frequency regulations, including but not limited to licences or authorisations required under the laws of the jurisdiction in which the ground station is located (including, as applicable, regulations issued by the FCC, OFCOM, EETT, or equivalent authority). OrbitAlert is not responsible for assessing, verifying, or ensuring the Customer’s regulatory compliance in this regard.
• The Customer Data it submits does not and will not infringe any third-party Intellectual Property Rights or violate any applicable law.
• The Customer has obtained all necessary consents and authorisations for any personal data it causes to be processed by OrbitAlert through the Service.

These representations and warranties are ongoing. If any of them become untrue, the Customer must immediately notify OrbitAlert and cease using the Service. Breach of any representation or warranty in this section is grounds for immediate termination without refund.

The Customer must provide and maintain accurate, current, and complete account information. The Customer is responsible for all activity under its account, including activity by employees, contractors, or agents to whom it grants access.

The Customer is solely responsible for the security of its login credentials and API Keys. API Keys must not be embedded in publicly accessible code, committed to public repositories, transmitted unencrypted, or shared with unauthorised parties. OrbitAlert is not liable for any loss arising from the Customer’s failure to protect its credentials.

The Customer must notify OrbitAlert immediately at legal@orbitalert.net upon discovering any suspected unauthorised access or credential compromise. Accounts are non-transferable without OrbitAlert’s prior written consent.

Authorised users. The Customer may permit its employees and contractors (“Authorised Users”) to access the Service under the Customer’s account, subject to these Terms. The Customer is fully responsible for the acts and omissions of all Authorised Users as if they were acts or omissions of the Customer. The Customer must ensure all Authorised Users are aware of and comply with these Terms. OrbitAlert may enforce these Terms directly against any Authorised User, and the Customer indemnifies OrbitAlert against any Claim arising from an Authorised User’s breach. The Customer must promptly revoke access of any Authorised User who leaves its organisation or breaches these Terms.

Change of control — Customer. If the Customer undergoes a change of control (defined as any transaction in which a third party acquires more than 50% of the Customer’s voting shares, or substantially all of its assets), the Customer must notify OrbitAlert in writing within 14 days of the transaction closing. If the acquiring entity: (a) is a direct competitor of OrbitAlert; (b) is subject to trade sanctions or export restrictions; or (c) is prohibited under Section 8 (Prohibited customer categories), OrbitAlert may terminate these Terms on 30 days’ written notice, with a pro-rated refund of prepaid Fees for the period after termination. Failure to provide notice of a change of control is a material breach.

Subscription Fees are charged in advance on a monthly or annual basis as specified at checkout. All prices are in Euros (EUR) and exclude applicable taxes. The Customer is solely responsible for all applicable taxes, duties, and levies including VAT.

Auto-renewal. Subscriptions renew automatically at the end of each billing period at the then-current rate unless cancelled before the renewal date. Cancellation takes effect at the end of the current billing period.

Price changes. OrbitAlert may change Fees upon 30 days’ written notice. Continued use after the effective date constitutes acceptance.

Non-refundable. All Fees are non-refundable except where required by mandatory law. No refunds are issued for: partial billing periods; unused API calls or Webhooks; plan downgrades; Webhook failures caused by Customer misconfiguration; interruptions caused by TLE data inaccuracies; or service changes made under Section 10. If the Customer believes it has been charged incorrectly, it must notify OrbitAlert within 30 days of the charge date.

Late payment. Overdue amounts accrue interest at the statutory rate under Greek law. OrbitAlert may suspend access after 7 days’ notice and may engage a collection agency for persistently overdue accounts.

Withholding. All Fees are payable without deduction or withholding. If any applicable law requires the Customer to withhold taxes, the Customer must gross up the payment so that OrbitAlert receives the full Fee net of any such withholding.

Subject to the exclusions below, OrbitAlert targets the following monthly uptime for the API and Webhook delivery subsystem:

Sole remedy. Service Credits are the Customer’s sole and exclusive remedy for any SLA failure. Credits must be claimed within 30 days of the incident by written notice to legal@orbitalert.net. Credits apply only to future invoices and are not redeemable for cash. Unclaimed credits expire 90 days after issuance.

Exclusions. SLA obligations do not apply to downtime caused by: (a) Customer actions or Customer infrastructure failures, including misconfigured Webhook endpoints; (b) outages of third-party data providers (Celestrak, NOAA SWPC); (c) scheduled maintenance communicated at least 24 hours in advance; (d) Force Majeure Events; or (e) attacks on OrbitAlert infrastructure.

Uptime calculation methodology. Monthly uptime is calculated as: ((total minutes in calendar month − downtime minutes) / total minutes in calendar month) × 100. “Downtime” means a period of at least five (5) consecutive minutes during which the API returns 5xx errors or times out for more than 50% of requests, as measured by OrbitAlert’s internal monitoring systems. Isolated errors, single failed requests, or degraded (but partially functional) service do not constitute Downtime. Scheduled maintenance windows communicated at least 24 hours in advance are excluded from Downtime calculations. OrbitAlert’s measurement of uptime is final and determinative.

Expert determination for disputed outages. If the Customer disputes OrbitAlert’s uptime measurement for any month, the Customer must provide written notice within 30 days of the end of that month, including supporting evidence. The parties shall attempt to resolve the dispute within 14 days. If unresolved, either party may request that an independent technical expert (agreed by both parties or, failing agreement, appointed by the Athens Chamber of Commerce) review the evidence and issue a binding determination. The cost of the expert shall be borne by the losing party. During any dispute, the Customer must continue to pay all undisputed Fees.

Incident communication. OrbitAlert will communicate active incidents and scheduled maintenance via a status page. The Customer is responsible for monitoring the status page. OrbitAlert will also attempt to notify subscribed customers by email for incidents lasting more than 30 minutes, but email notification is not guaranteed and does not affect SLA calculations.

The Customer agrees not to, and not to permit any third party to:

• Resell, sublicense, white-label, or redistribute API access or Pass Prediction outputs as a standalone data product without prior written consent.
• Publish, disclose, or distribute benchmark tests, performance comparisons, or competitive analyses of the Service without OrbitAlert’s prior written consent.
• Use the Service to track satellites or conduct activities that violate export control laws, trade sanctions, arms embargoes, or international regulations (see also Section 16).
• Reverse-engineer, decompile, disassemble, or attempt to derive source code, algorithms, or trade secrets from the Service.
• Circumvent, disable, or interfere with any rate limit, authentication mechanism, or security control.
• Perform load testing, automated scraping, or stress testing against the Service without prior written authorisation from OrbitAlert.
• Introduce malicious code, conduct denial-of-service attacks, or interfere with the availability of the Service to other customers.
• Use the Service in connection with any military targeting, weapons guidance, or activity that could endanger human life.
• Create multiple accounts to circumvent plan quotas or access restrictions.
• Use the Service in any way that infringes third-party rights or violates applicable law.
• Represent to any third party that the Customer is an official partner, reseller, affiliate, or authorised representative of OrbitAlert without OrbitAlert’s prior written consent. This includes using OrbitAlert’s name, logo, or trademarks in any customer-facing marketing, press releases, or social media without approval.
• Use Pass Prediction outputs, Webhook payloads, or any other data produced by the Service as training data, reference data, or ground truth for the development of a competing orbital prediction algorithm, machine-learning model, or satellite tracking product.

Prohibited customer categories. The following categories of customers and use cases are prohibited from using the Service, regardless of technical compliance with the above list:

• Organisations or individuals engaged in the surveillance, tracking, or monitoring of individuals without their knowledge or lawful authorisation.
• Organisations subject to comprehensive trade sanctions by the EU, US, UN, or UK at the time of account creation or at any point during the Subscription Term.
• Operators of satellites or ground stations that are not licensed under applicable national radio frequency regulations.
• Any entity whose primary purpose is the development, production, or delivery of autonomous lethal weapons systems.
• Any entity that OrbitAlert reasonably determines, in its sole discretion, poses a material legal, reputational, or regulatory risk to OrbitAlert.

OrbitAlert may suspend or terminate access immediately, without notice and without refund, for violations of this section, and may report violations to applicable authorities.

Each subscription plan includes defined API call quotas and Webhook delivery limits. OrbitAlert may throttle or suspend API access if usage patterns indicate abuse, create system risk, or exceed fair-use limits.

API Key security. API Keys must be treated as passwords. They must not be exposed in client-side code, public repositories, or over unencrypted channels. OrbitAlert may revoke compromised API Keys immediately.

No guaranteed delivery. OrbitAlert implements an exponential retry mechanism for failed Webhook deliveries but does not guarantee delivery within any specified lead time. The Customer is responsible for implementing fallback mechanisms for any operational system that depends on Webhook notifications. OrbitAlert is not liable for any missed pass windows caused by Webhook delivery failure, regardless of cause.

OrbitAlert reserves the right, at any time and without liability, to:

• Add, modify, or remove satellites from the supported catalogue.
• Change TLE data sources, orbital propagation parameters, or prediction algorithms.
• Change API endpoints, request/response formats, or authentication methods. For breaking changes to stable API versions, OrbitAlert will endeavour to provide at least 90 days’ notice. Non-breaking changes (additive fields, new optional parameters) may be deployed without notice.
• Impose or adjust rate limits and usage quotas for individual plans.
• Discontinue any feature, functionality, or integration, with 30 days’ notice where reasonably practicable.
• Perform scheduled or emergency maintenance that temporarily interrupts Service availability.

The Customer’s sole remedy if it objects to a Service modification is to cancel its subscription before the modification takes effect. No refunds are issued for modifications that the Customer finds objectionable unless OrbitAlert removes a feature that was an express material term of the Customer’s Order Form.

No liability for upstream changes. OrbitAlert is not liable for any Pass Prediction inaccuracies or Service disruptions resulting from changes made by Celestrak, Space-Track, NOAA SWPC, or any other third-party data source to their data formats, access policies, or availability.

The Service relies on third-party data sources outside OrbitAlert’s control, including:

• Celestrak / Space-Track.org — TLE sets used for orbital propagation.
• NOAA Space Weather Prediction Center (SWPC) — real-time Kp index and geomagnetic storm data.

OrbitAlert is not responsible for the accuracy, completeness, availability, or timeliness of data from these sources. Service disruptions, data gaps, or inaccuracies originating from third-party sources are not SLA events and do not constitute a breach of these Terms.

Pass Prediction accuracy degrades as TLE epoch age increases. The Customer must not rely solely on OrbitAlert Pass Predictions for activities where TLE staleness could result in mission failure, data loss, equipment damage, or safety risk. This is a known, inherent limitation of all TLE-based prediction systems and is not a defect in the Service.

OrbitAlert and its licensors retain all Intellectual Property Rights in the Service, including all software, algorithms, user interfaces, visual design, trade names, trademarks, and Documentation. These Terms grant the Customer only a limited, non-exclusive, non-transferable, revocable licence to access and use the Service during the Subscription Term for its own internal operational purposes.

The Customer retains all Intellectual Property Rights in Customer Data. By submitting Customer Data, the Customer grants OrbitAlert a non-exclusive, worldwide, royalty-free licence to process, store, and use that data solely to provide and improve the Service.

Pass Prediction outputs are made available for the Customer’s own internal use. The Customer may not redistribute, resell, or republish them as a competing data or API product. The Customer may not use OrbitAlert’s name, logo, or trademarks without prior written consent.

If the Customer provides any suggestions, ideas, enhancement requests, or other feedback relating to the Service (“Feedback”), the Customer grants OrbitAlert a perpetual, irrevocable, worldwide, royalty-free, fully sublicensable licence to use, incorporate, and commercialise such Feedback in any product or service, without obligation, compensation, or attribution to the Customer. OrbitAlert has no obligation to implement or respond to any Feedback.

Each party (“Receiving Party”) may receive Confidential Information from the other party (“Disclosing Party”). “Confidential Information” means information designated as confidential or that should reasonably be understood to be confidential.

The Receiving Party shall: (a) protect Confidential Information with at least the same care as its own confidential information, but no less than reasonable care; (b) use it only to exercise rights or fulfil obligations under these Terms; and (c) not disclose it to any third party without prior written consent, except to employees or contractors bound by equivalent confidentiality obligations.

Obligations do not apply to information that: (a) is or becomes publicly known through no fault of the Receiving Party; (b) was known before disclosure; (c) is received from a third party without restriction; or (d) is independently developed without use of Confidential Information. Disclosure required by law is permitted with prompt written notice and cooperation in seeking a protective order.

Ownership & accuracy. The Customer owns all Customer Data and is solely responsible for its accuracy, legality, and completeness. OrbitAlert is not responsible for errors in Pass Predictions caused by incorrect Customer Data, including inaccurate ground station coordinates.

No sensitive data. The Customer must not submit to the Service any data classified as sensitive under applicable law, including personal data of minors, health data, biometric data, financial account credentials, government identification numbers, or any data whose disclosure would constitute a breach of applicable law or third-party obligation. The Customer indemnifies OrbitAlert against any Claim arising from its breach of this obligation.

Backup. OrbitAlert maintains internal infrastructure backups but does not guarantee recovery of Customer Data in all circumstances. The Customer is responsible for maintaining independent backups of any critical configurations.

Export on termination. The Customer may request a machine-readable export of its configurations and delivery logs within 30 days of termination. After this period, OrbitAlert may permanently delete Customer Data.

The Service may be subject to export control laws and regulations, including the U.S. Export Administration Regulations (EAR), the International Traffic in Arms Regulations (ITAR), EU dual-use regulations, and applicable UN, EU, US, and UK sanctions regimes.

The Customer represents and warrants (on an ongoing basis) that: (a) it is not located in, controlled by, or a national of any embargoed jurisdiction; (b) it is not on any government restricted-party list; (c) it will not use the Service in violation of any export control or sanctions law; and (d) it will obtain all necessary licences or authorisations before using the Service in any manner that triggers such obligations.

OrbitAlert may immediately suspend or terminate access, without refund or liability, upon determining that the Customer’s use violates this section.

THE SERVICE IS PROVIDED “AS IS” AND “AS AVAILABLE” WITHOUT WARRANTY OF ANY KIND. TO THE MAXIMUM EXTENT PERMITTED BY APPLICABLE LAW, ORBITALERT EXPRESSLY DISCLAIMS ALL WARRANTIES, WHETHER EXPRESS, IMPLIED, STATUTORY, OR OTHERWISE, INCLUDING IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, TITLE, ACCURACY, AND NON-INFRINGEMENT.

ORBITALERT SPECIFICALLY DISCLAIMS ANY WARRANTY THAT: (A) THE SERVICE WILL MEET THE CUSTOMER’S REQUIREMENTS; (B) THE SERVICE WILL BE UNINTERRUPTED, TIMELY, SECURE, OR ERROR-FREE; (C) ANY PASS PREDICTION, TIMING ESTIMATE, AZIMUTH VALUE, OR SPACE WEATHER READING WILL BE ACCURATE OR FIT FOR OPERATIONAL USE; (D) ANY WEBHOOK WILL BE DELIVERED WITHIN A SPECIFIED LEAD TIME OR AT ALL; (E) DEFECTS WILL BE CORRECTED; OR (F) ANY DATA PROVIDED WILL BE FREE FROM DISRUPTIONS CAUSED BY THIRD-PARTY DATA SOURCE OUTAGES.

THE CUSTOMER ASSUMES ALL RISK ASSOCIATED WITH USING PASS PREDICTIONS FOR OPERATIONAL DECISIONS INCLUDING ANTENNA POSITIONING, DOWNLINK SCHEDULING, AND MISSION PLANNING. USE FOR SAFETY-OF-LIFE SYSTEMS, NAVIGATION, DEFENCE APPLICATIONS, OR ANY CONTEXT WHERE PREDICTION ERROR COULD RESULT IN INJURY, DEATH, PROPERTY DAMAGE, OR MISSION FAILURE IS ENTIRELY AT THE CUSTOMER’S RISK.

No pre-contractual reliance. The Customer acknowledges that it has not relied on any statement, representation, assurance, or warranty made by OrbitAlert or its representatives that is not expressly set out in these Terms.

TO THE MAXIMUM EXTENT PERMITTED BY APPLICABLE LAW, IN NO EVENT SHALL ORBITALERT, ITS AFFILIATES, OFFICERS, DIRECTORS, EMPLOYEES, AGENTS, OR LICENSORS BE LIABLE FOR ANY:

• INDIRECT, INCIDENTAL, SPECIAL, CONSEQUENTIAL, PUNITIVE, OR EXEMPLARY DAMAGES;
• LOSS OF PROFITS, REVENUE, OR ANTICIPATED SAVINGS;
• LOSS OF BUSINESS, CONTRACTS, OR GOODWILL;
• LOSS OF OR CORRUPTION OF DATA OR CONFIGURATIONS;
• MISSED SATELLITE PASS WINDOWS OR DOWNLINK OPPORTUNITIES;
• ANTENNA MISALIGNMENT, EQUIPMENT DAMAGE, OR OPERATIONAL FAILURE;
• MISSION FAILURE, PAYLOAD LOSS, OR DATA COLLECTION GAPS;
• COST OF SUBSTITUTE SERVICES OR PROCUREMENT OF REPLACEMENT GOODS;
• ANY OTHER DIRECT OR INDIRECT COMMERCIAL, OPERATIONAL, OR FINANCIAL LOSS;

WHETHER ARISING UNDER CONTRACT, TORT (INCLUDING NEGLIGENCE), STRICT LIABILITY, OR ANY OTHER LEGAL THEORY, EVEN IF ORBITALERT HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.

ORBITALERT’S TOTAL AGGREGATE LIABILITY TO THE CUSTOMER FOR ALL CLAIMS ARISING UNDER OR RELATED TO THESE TERMS OR THE SERVICE SHALL NOT EXCEED THE TOTAL FEES ACTUALLY PAID BY THE CUSTOMER TO ORBITALERT IN THE THREE (3) CALENDAR MONTHS IMMEDIATELY PRECEDING THE FIRST EVENT GIVING RISE TO THE CLAIM.

THE CUSTOMER ACKNOWLEDGES THAT: (A) THE FEE STRUCTURE REFLECTS THE ALLOCATION OF RISK IN THESE TERMS; (B) ORBITALERT WOULD NOT ENTER INTO THESE TERMS WITHOUT THESE LIMITATIONS; AND (C) THE LIMITATIONS APPLY REGARDLESS OF THE FORM OF ACTION AND REGARDLESS OF WHETHER ANY REMEDY FAILS OF ITS ESSENTIAL PURPOSE.

SOME JURISDICTIONS DO NOT PERMIT CERTAIN LIABILITY EXCLUSIONS OR LIMITATIONS. IN SUCH JURISDICTIONS, THE ABOVE APPLIES TO THE FULLEST EXTENT PERMITTED BY LAW.

Mandatory pre-suit notice. Before initiating any legal proceeding against OrbitAlert, the Customer must provide written notice to OrbitAlert at legal@orbitalert.net describing the Claim in reasonable detail, the factual basis for it, and the remedy sought. OrbitAlert shall have 30 days from receipt of such notice to attempt to resolve the Claim informally. Legal proceedings may not be commenced until this 30-day period has expired.

Time limit for notification. The Customer must notify OrbitAlert in writing of any Claim or potential Claim within 30 days of the date on which the Customer first became aware, or ought reasonably to have become aware, of the facts giving rise to the Claim. Failure to provide timely notice under this section shall constitute an irrevocable waiver of the Claim to the maximum extent permitted by applicable law.

No waiver by delay. OrbitAlert’s failure to enforce any provision of these Terms at any time shall not be construed as a waiver of any past, present, or future right to enforce that provision.

The Customer has a duty to take all reasonable steps to mitigate any loss or damage it suffers arising out of or in connection with these Terms or the Service. The Customer must not allow losses to accumulate or compound when reasonable steps could have reduced them. OrbitAlert shall not be liable for any loss or damage that could have been avoided or reduced by the Customer’s reasonable mitigating action.

This duty includes, without limitation: implementing fallback systems if the Customer depends on Webhook notifications for time-critical operations; monitoring for service degradation rather than relying solely on OrbitAlert status communications; and using independent verification for Pass Predictions when precision is operationally critical.

The Customer shall indemnify, defend, and hold harmless OrbitAlert and its affiliates, officers, directors, employees, agents, and licensors from and against any Claims arising out of or in connection with:

• The Customer’s use of the Service in violation of these Terms or applicable law.
• Any Customer Data submitted to the Service, including any Claim that it infringes third-party rights.
• The Customer’s breach of any representation, warranty, or obligation under these Terms.
• The Customer’s violation of any export control law or sanctions regime.
• Any use of Pass Predictions in operational, safety-critical, or defence contexts.
• Any Claim by a third party arising from Customer products or services that incorporate or rely on Service outputs.
• The Customer’s submission of any sensitive, prohibited, or unlawful data under Section 15.

OrbitAlert may assume exclusive control of any indemnified matter at its own expense. The Customer may not settle any such Claim without OrbitAlert’s prior written consent.

Neither party shall be liable for any failure or delay in performing its obligations to the extent caused by a Force Majeure Event. Force Majeure Events include without limitation:

• Outages or disruptions of Celestrak, Space-Track, NOAA SWPC, or any upstream data source.
• Large-scale internet infrastructure failures or routing disruptions.
• DDoS attacks or other cyberattacks on OrbitAlert or its infrastructure providers.
• Government actions, export restrictions, or sanctions affecting service delivery.
• Extreme geomagnetic storms, solar flares, or space weather events disrupting data centres or internet infrastructure.
• Pandemic, epidemic, natural disaster, or acts of war.

OrbitAlert will provide prompt notice of any Force Majeure Event and will use commercially reasonable efforts to resume performance. If a Force Majeure Event continues for more than 30 consecutive days, either party may terminate the affected services without penalty. No SLA Credits are owed for downtime caused by a Force Majeure Event.

By Customer. The Customer may cancel at any time through the dashboard. Cancellation takes effect at the end of the current billing period. No refund is issued for the remaining period.

Emergency suspension. Notwithstanding any notice requirement in these Terms, OrbitAlert may suspend the Customer’s access to the Service immediately and without prior notice if OrbitAlert determines, in its sole and reasonable discretion, that the Customer’s account is: (a) being used to conduct, facilitate, or propagate a cyberattack, DDoS attack, or other malicious activity against OrbitAlert or any third party; (b) subject to an active security breach or credential compromise; (c) being used in a manner that creates immediate legal exposure for OrbitAlert under any export control or sanctions regime; or (d) causing material harm to the availability or integrity of the Service for other customers. OrbitAlert will notify the Customer of the suspension and its reasons as soon as reasonably practicable after the fact, and will restore access if the security concern is resolved to OrbitAlert’s satisfaction.

By OrbitAlert for cause. OrbitAlert may suspend or terminate immediately, without notice or refund, if: (a) the Customer breaches any material provision and fails to cure within 7 days of written notice; (b) the Customer violates Section 8 (Acceptable Use) or Section 16 (Export Controls); (c) Fees remain unpaid after 7 days’ notice; or (d) the Customer becomes insolvent or subject to insolvency proceedings.

By OrbitAlert for convenience. OrbitAlert may terminate upon 30 days’ written notice. In this case, OrbitAlert will refund pro-rated Fees for the period after the effective termination date.

Effect of termination. Upon termination: (a) all licences immediately cease; (b) the Customer must cease all use of the Service and API; (c) each party must return or destroy the other’s Confidential Information on request. Sections 12–22, 24, 25, 27, 29–31, and 34 survive termination.

These Terms are governed by the laws of the Hellenic Republic (Greece) and, where applicable, European Union law, without regard to conflict-of-law principles.

Mandatory negotiation. Before commencing legal proceedings, the parties must attempt good-faith resolution as set out in Section 19. If unresolved after 30 days, either party may refer the dispute to the competent courts of Athens, Greece, which shall have exclusive jurisdiction, except where mandatory consumer protection law requires otherwise.

No class actions. To the maximum extent permitted by applicable law, each party waives the right to participate in a class action, class arbitration, or consolidated proceeding against the other party. All Claims must be brought on an individual basis only.

Attorneys’ fees. In any legal proceeding brought to enforce these Terms or arising from the Customer’s use of the Service, the prevailing party shall be entitled to recover its reasonable attorneys’ fees and court costs from the non-prevailing party, in addition to any other relief to which the prevailing party may be entitled, to the extent permitted by applicable law. For the avoidance of doubt, OrbitAlert shall be entitled to recover attorneys’ fees incurred in enforcing any indemnification obligation of the Customer.

Language. These Terms are in English. In any conflict between the English version and a translation, the English version prevails.

ANY CLAIM ARISING OUT OF OR RELATING TO THESE TERMS, THE SERVICE, OR THE RELATIONSHIP BETWEEN THE PARTIES MUST BE COMMENCED WITHIN ONE (1) YEAR AFTER THE DATE ON WHICH THE PARTY ASSERTING THE CLAIM FIRST KNEW, OR SHOULD REASONABLY HAVE KNOWN, OF THE FACTS GIVING RISE TO THE CLAIM.

CLAIMS NOT COMMENCED WITHIN THIS PERIOD ARE PERMANENTLY BARRED, REGARDLESS OF ANY LONGER STATUTORY LIMITATION PERIOD THAT WOULD OTHERWISE APPLY.

This contractual limitation applies to all Claims including those arising in contract, tort (including negligence), equity, or under statute, to the maximum extent permitted by applicable law. The parties expressly agree that this limitation is reasonable and reflects a fair allocation of risk given the Fees charged for the Service.

OrbitAlert reserves the right to audit the Customer’s use of the Service to verify compliance with these Terms, including without limitation compliance with plan quotas, the acceptable use restrictions in Section 8, the export control obligations in Section 16, and the prohibition on reselling or sublicensing in Section 8.

Automated monitoring. OrbitAlert continuously monitors API usage patterns, request volumes, source IP addresses, and Webhook delivery targets. The Customer consents to this monitoring as a condition of access to the Service. Monitoring data may be used as evidence of a breach.

On-request audit. Upon reasonable written notice (which may be as short as 24 hours if OrbitAlert reasonably suspects a material breach), OrbitAlert may request that the Customer provide records, logs, or written attestations sufficient to verify its compliance. The Customer must respond within 10 business days. Failure to cooperate with an audit request within that period shall constitute a material breach of these Terms.

Cost of audit. If an audit reveals that the Customer has exceeded its plan quotas, engaged in reselling, or otherwise materially breached these Terms, OrbitAlert may: (a) invoice the Customer for any unpaid Fees corresponding to actual usage above plan limits; (b) recover the reasonable costs of conducting the audit; and (c) exercise any other remedy available under these Terms.

Notwithstanding any other provision of these Terms, OrbitAlert may collect, process, and use data about the Customer’s use of the Service — including API request patterns, Webhook delivery success rates, query parameters, and performance metrics — for the following purposes:

• Improving the reliability, performance, and features of the Service.
• Generating aggregated, anonymised industry benchmarks and statistics.
• Internal security monitoring and anomaly detection.
• Capacity planning and infrastructure provisioning.
• Producing aggregate reports published externally (e.g., “average Webhook delivery latency across all customers”).

All such data is used only in aggregated and anonymised form that does not identify the Customer or any individual. Nothing in this section permits OrbitAlert to disclose Customer Data to third parties in identifiable form or to use Customer Data in a manner that violates the Privacy Policy.

The Customer is solely responsible for the security, availability, and correct configuration of any Webhook endpoint URL it registers with the Service. This includes but is not limited to:

• Ensuring the endpoint is served over HTTPS with a valid TLS certificate. OrbitAlert will not deliver Webhooks to plaintext HTTP endpoints in production.
• Implementing authentication or signature verification on the endpoint to prevent unauthorised parties from submitting fake Webhook payloads.
• Ensuring the endpoint is not publicly documented, listed, or otherwise discoverable in a way that could expose pass prediction data to unauthorised parties.
• Monitoring the endpoint for availability so that delivery failures are detected promptly.

No liability for endpoint compromise. OrbitAlert is not responsible for any unauthorised access to, interception of, or misuse of Webhook payloads once they have been delivered to the Customer’s endpoint. If the Customer’s endpoint is compromised and pass prediction data is disclosed to unauthorised third parties, this is entirely the Customer’s responsibility.

No liability for endpoint unavailability. If the Customer’s Webhook endpoint is unavailable, returns errors, or is misconfigured, OrbitAlert will attempt delivery in accordance with its retry policy but bears no liability for any missed pass notifications resulting from endpoint unavailability, regardless of cause.

Payload verification. OrbitAlert recommends that the Customer verify Webhook payloads using the HMAC signature header included with each delivery. OrbitAlert is not responsible for any harm resulting from the Customer’s failure to implement payload verification.

Financial assurance. If OrbitAlert reasonably determines that the Customer’s financial condition has materially deteriorated (including, without limitation, payment defaults, insolvency proceedings, or significant adverse changes in creditworthiness), OrbitAlert may, upon written notice, require the Customer to provide a prepayment or deposit equal to up to three (3) months of Fees as a condition of continued access to the Service.

Set-off. OrbitAlert may set off any amount owed by the Customer to OrbitAlert (including outstanding Fees, audit costs, or indemnification amounts) against any credit, refund, or other amount that OrbitAlert owes to the Customer. The Customer may not set off any amount it believes OrbitAlert owes it against Fees due to OrbitAlert without OrbitAlert’s prior written consent.

Survival of payment obligations. Cancellation or termination of a subscription does not extinguish any Fees that accrued prior to the effective date of cancellation. All outstanding Fees remain due and payable immediately upon termination, regardless of the reason for termination.

Disputed Fees. The Customer must pay all undisputed Fees on time. The existence of a Fee dispute does not entitle the Customer to withhold payment of undisputed amounts or to suspend performance of any obligation under these Terms.

If any governmental authority, regulatory body, or law enforcement agency initiates an investigation, audit, inquiry, or proceeding that relates to or arises from the Customer’s use of the Service or the Customer’s business (a “Regulatory Matter”), the Customer shall:

• Promptly notify OrbitAlert in writing upon becoming aware of any Regulatory Matter that could involve OrbitAlert or the Service.
• Cooperate fully with OrbitAlert in responding to any related information requests or subpoenas directed at OrbitAlert.
• Indemnify OrbitAlert for all reasonable legal fees, expert costs, response costs, and other expenses OrbitAlert incurs as a result of any Regulatory Matter arising from the Customer’s use of the Service or breach of these Terms.

OrbitAlert's right to cooperate. OrbitAlert reserves the right to respond to any lawful governmental or regulatory request or subpoena relating to the Service or the Customer’s account, including by disclosing Customer Data to the extent required by law, without incurring any liability to the Customer. OrbitAlert will, where legally permitted, provide the Customer with reasonable advance notice of such disclosure.

Suspension during investigation. OrbitAlert may suspend the Customer’s access to the Service without liability if a governmental authority requests suspension or if OrbitAlert reasonably determines that continued provision of the Service during a Regulatory Matter poses legal, reputational, or operational risk to OrbitAlert.

Given the specialized nature of the Service, the following additional disclaimers apply and are incorporated into the general disclaimer in Section 17:

Unreported orbital manoeuvres. Satellite operators may perform orbit-raising, station-keeping, collision avoidance, or deorbit manoeuvres at any time without public notice. Such manoeuvres immediately invalidate any Pass Predictions computed from pre-manoeuvre TLE Data. OrbitAlert has no way to detect or compensate for unreported manoeuvres and accepts no liability for prediction errors caused by them.

Satellite decommissioning and deorbit. If a satellite ceases to function, re-enters the atmosphere, or is decommissioned, Pass Predictions based on its last known TLE may continue to appear valid for a period after the event. OrbitAlert does not monitor satellite operational status and will continue to generate predictions based on available TLE Data regardless of satellite health. The Customer is responsible for cross-checking satellite operational status with authoritative sources.

Catalogue number ambiguity. The Customer is responsible for correctly identifying satellites by their NORAD catalogue number or internationally recognised designator. OrbitAlert is not responsible for predictions generated for the wrong satellite due to Customer misidentification.

Atmospheric and ionospheric conditions.Pass Predictions do not account for real-time atmospheric ducting, tropospheric refraction anomalies beyond standard models, or ionospheric conditions that may affect radio propagation on specific passes. The Kp index provided is a planetary-average indicator; local ionospheric conditions may differ significantly.

Ground station elevation mask. OrbitAlert computes passes based on the elevation mask value submitted by the Customer. The Customer is responsible for setting an accurate elevation mask that reflects the actual radio frequency horizon at its ground station, accounting for local terrain, buildings, and obstructions. Passes computed with an incorrect elevation mask are not a defect in the Service.

Coordinate system. All coordinates are computed in the WGS-84 reference frame. The Customer is responsible for ensuring that ground station coordinates submitted to the Service are in WGS-84 and are accurate to the precision required for its operations.

No accuracy guarantee. OrbitAlert does not make any representation regarding the accuracy of Pass Predictions beyond what is inherently achievable with SGP4/SDP4 propagation and TLE Data of the epoch age available at the time of computation. Predictions for low Earth orbit satellites with TLE ages exceeding 48 hours may have timing errors exceeding several minutes. This is an inherent characteristic of the prediction method and is not a failure of the Service.

OrbitAlert takes the security of its Service seriously. If the Customer or any Authorised User discovers a potential security vulnerability, misconfiguration, or exposure in the Service, the Customer must:

• Report the vulnerability promptly and in good faith to OrbitAlert at legal@orbitalert.net with the subject line “Security Disclosure”, including a description of the vulnerability, steps to reproduce it, and its potential impact.
• Allow OrbitAlert a minimum of 90 days from the date of report to investigate and remediate the vulnerability before making any public disclosure.
• Not exploit the vulnerability beyond what is strictly necessary to confirm its existence and report it to OrbitAlert.
• Not access, modify, delete, or exfiltrate any data belonging to OrbitAlert or any other customer during the course of security research.

Prohibition on unauthorised testing. The Customer must not conduct any security scanning, penetration testing, vulnerability assessment, or other security research against the Service or OrbitAlert’s infrastructure without prior written authorisation from OrbitAlert. Unauthorised testing is a material breach of these Terms and may constitute a criminal offence under applicable computer misuse laws.

No liability for good-faith reporting.OrbitAlert will not pursue legal action against any Customer who reports a vulnerability in good faith in accordance with this section and does not violate its obligations above. This commitment does not extend to vulnerabilities discovered through or in connection with any unauthorised access, data exfiltration, or exploitation of OrbitAlert systems.

By creating an account, the Customer consents to receive electronic communications from OrbitAlert including service announcements, billing notices, security alerts, and Terms updates. Electronic notices are effective when sent to the Customer’s registered email address. The Customer is responsible for keeping its email address current. OrbitAlert is not liable for missed notices due to an outdated or blocked address.

Electronic signatures. The Customer agrees that clicking “I agree”, creating an account, or otherwise affirmatively indicating acceptance of these Terms constitutes a valid, legally binding electronic signature equivalent to a handwritten signature, in accordance with applicable electronic signature laws including the EU eIDAS Regulation.

OrbitAlert may modify these Terms at any time. Material changes will be communicated via email or in-dashboard notice at least 14 days before taking effect. Non-material changes (editorial, formatting, clarifications) may be made without notice.

Continued use of the Service after the effective date of revised Terms constitutes acceptance. The Customer’s sole remedy if it objects to any change is to cease using the Service and cancel before the effective date.

Entire agreement

These Terms, together with the Privacy Policy, any Data Processing Agreement, and any applicable Order Form, constitute the entire agreement between the parties regarding the Service and supersede all prior representations, negotiations, and agreements on the same subject matter.

No oral modifications

No modification of these Terms is valid unless made in writing and signed (including electronically) by authorised representatives of both parties. No statement, promise, or representation made by OrbitAlert's employees or agents outside these Terms creates any obligation, and the Customer may not rely on any such statement.

Precedence

In the event of conflict between these Terms and any Order Form or other document, these Terms prevail unless the Order Form expressly and specifically overrides a named provision.

No third-party beneficiaries

These Terms are for the sole benefit of OrbitAlert and the Customer. No third party — including the Customer's own end-users, employees, or clients — shall have any right to enforce any provision of these Terms or to make any Claim against OrbitAlert as a result of the Customer's use of the Service.

Severability

If any provision of these Terms is found to be invalid, illegal, or unenforceable, it shall be modified to the minimum extent necessary to make it enforceable, or severed if modification is not possible. The remaining provisions continue in full force and effect.

No waiver

Failure to enforce any provision at any time does not waive the right to enforce it in the future. A waiver of any breach does not constitute a waiver of any subsequent breach of the same or any other provision.

Cumulative remedies

The rights and remedies of OrbitAlert under these Terms are cumulative and not exclusive of any rights or remedies provided by law. No single or partial exercise of any right or remedy prevents further exercise of that right or remedy.

Assignment

The Customer may not assign or transfer any rights or obligations under these Terms without OrbitAlert's prior written consent. OrbitAlert may assign these Terms in connection with a merger, acquisition, reorganisation, or sale of substantially all of its assets, upon notice to the Customer. Any purported assignment in violation of this provision is void.

Relationship of parties

The parties are independent contractors. Nothing in these Terms creates any partnership, joint venture, agency, franchise, or employment relationship. Neither party has authority to bind the other.

Anti-corruption and bribery

Each party represents and warrants that it has not and will not, directly or indirectly, offer, pay, promise, or authorise the payment of any money, gift, or other thing of value to any government official, political party, or any other person for the purpose of improperly influencing any act or decision, or securing any improper advantage, in connection with these Terms or the Service. Each party shall comply with all applicable anti-corruption and anti-bribery laws, including the U.S. Foreign Corrupt Practices Act (FCPA), the UK Bribery Act 2010, and applicable EU and Greek anti-corruption laws. Breach of this provision is grounds for immediate termination without refund and shall trigger the Customer's indemnification obligations under Section 21.

Confidential pricing

The Customer agrees to keep confidential the specific pricing, discounts, credits, and commercial terms applicable to its subscription, and shall not disclose them to any third party (including competitors of OrbitAlert) without OrbitAlert's prior written consent. This obligation does not apply to disclosure required by law or to the Customer's professional advisers under an obligation of confidentiality.

Sovereign immunity waiver

If the Customer is a government entity or an entity owned or controlled by a government, the Customer hereby irrevocably and unconditionally waives, to the fullest extent permitted by applicable law, any right of sovereign immunity from suit, jurisdiction, attachment, or enforcement that it may otherwise be entitled to claim in connection with any dispute arising under these Terms.

Non-solicitation

During the Subscription Term and for twelve (12) months following its expiry or termination, the Customer shall not, directly or indirectly, solicit, recruit, or induce any employee, contractor, or consultant of OrbitAlert who was involved in the provision of the Service to the Customer, to leave OrbitAlert's employ or engagement. A general public job posting not specifically targeted at OrbitAlert personnel does not constitute a breach of this provision.

Open source components

The Service incorporates open source software components licensed under various open source licences (including MIT, Apache 2.0, and BSD licences). These components remain subject to their respective open source licences. Nothing in these Terms grants the Customer any rights in or to such open source components beyond what is already provided by the applicable open source licences. A list of material open source components used in the Service is available upon request at legal@orbitalert.net.

Business continuity and insolvency

In the event that OrbitAlert becomes insolvent, makes an assignment for the benefit of creditors, or is subject to liquidation proceedings, OrbitAlert will use commercially reasonable efforts to: (a) provide the Customer with at least 30 days' written notice before ceasing to operate the Service; and (b) make Customer Data available for export during that notice period. OrbitAlert recommends that Customers operating production systems maintain local copies of critical configurations and do not rely solely on OrbitAlert's infrastructure for mission continuity.

Accessibility

OrbitAlert aims to make the dashboard accessible to users with disabilities and targets conformance with WCAG 2.1 Level AA guidelines for the core dashboard interface. Accessibility is an ongoing effort; if you encounter a barrier, please contact us at legal@orbitalert.net and we will make reasonable efforts to address it. Accessibility conformance claims do not create any legal obligation beyond OrbitAlert's obligation to make reasonable efforts to improve accessibility over time.

Injunctive relief

The Customer acknowledges that a breach of Sections 8, 12, or 16 would cause irreparable harm to OrbitAlert for which monetary damages would be an inadequate remedy. Accordingly, OrbitAlert shall be entitled to seek injunctive or other equitable relief without the requirement to post a bond or security and without limiting any other remedy available.

Publicity

OrbitAlert may identify the Customer as a user of the Service in marketing materials, case studies, and investor presentations, using the Customer's name and logo, unless the Customer opts out by written notice to legal@orbitalert.net. This right does not extend to disclosing any Confidential Information.

Benchmark restrictions

The Customer may not publish, disclose, or make available to any third party the results of any benchmark test or performance comparison of the Service without OrbitAlert's prior written consent. Unauthorised benchmarks or competitive analyses constitute a material breach of these Terms.

Insurance

The Customer is strongly advised to maintain appropriate business insurance for any operational losses arising from reliance on satellite pass predictions, including but not limited to equipment damage, mission loss, and data collection gaps. OrbitAlert does not provide or act as a substitute for insurance coverage of any kind.

Government use

If the Customer is a government entity, the Service and Documentation are 'commercial items' as defined under applicable government procurement regulations. Government use is subject to these Terms.

Notices

All legal notices under these Terms must be sent in writing to OrbitAlert at legal@orbitalert.net. Notices to the Customer are sent to the registered account email. Notices are effective upon confirmed receipt.

Headings

Section headings are for convenience only and shall have no legal or contractual effect.

Counterparts

These Terms may be executed or accepted in counterparts, each of which shall be deemed an original. Electronic records of acceptance shall have the same legal effect as a written original.

For questions about these Terms, billing enquiries, or to report a violation of acceptable use, contact OrbitAlert at: