Space-Track

US military space surveillance REST API providing Two-Line Element (TLE) sets, conjunction data messages, orbital element sets, satellite catalog data, and decay predictions for tracked satellites and debris operated by the 18th Space Control Squadron.

Space-Track publishes 7 APIs on the APIs.io network, including Ancillary API, Authentication API, Conjunction Data API, and 4 more. Tagged areas include Space, Satellites, TLE, Orbital Data, and Space Surveillance.

The Space-Track catalog on APIs.io includes 1 JSON-LD context and 1 Spectral governance ruleset.

Space-Track’s developer surface includes authentication, developer portal, documentation, and 11 more developer resources.

🌐 Visit website 📡 Source on GitHub

41.3/100 developing ▬ flat Agent 22/100 agent aware Full breakdown ↓
scored 2026-08-25 · rubric v0.14.0

AccessFreeSelf serve⚡ Free to try

7 APIs

Space Satellites TLEOrbital DataSpace SurveillanceDebris TrackingConjunction DataUS Military

Kin Score

Kin Score How this is scored →
scored 2026-08-25 · rubric v0.14.0

Composite quality — 41.3/100 · developing

Contract Quality 17.3 / 25

Developer Ergonomics 6.2 / 20

Access Clarity 9.2 / 20

Operational Transparency 0.0 / 13

Contract Governance 1.2 / 12

Discoverability 7.4 / 10

Agent readiness — 22/100 · agent aware

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 10

Documented Reversibility 0 / 6

MCP Server 0 / 12

Machine-Readable Auth 10 / 10

Idempotency 0 / 9

Stable Error Semantics 0 / 8

Request/Response Examples 7 / 7

Rate-Limit Signaling 7 / 7

Typed Event Surface 0 / 6

Agent Skills 0 / 5

Well-Known Catalog 0 / 4

Consent & Bot Identity 0 / 3

A2A Agent Card 0 / 8

Dry-Run / Simulate Mode 0 / 4

Delegated User Identity 0 / 6

Protected Resource Metadata 0 / 5

Registration Without a Human 0 / 6

Agentic Commerce Surface 0 / 5

Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. This rating is computed from github.com/api-evangelist/spacetrack: open an issue to ask a question, or submit a pull request to add artifacts. Want it done for you? Prioritized profiling — $2,500 →

APIs 7

Individual APIs this provider publishes, each with its own machine-readable definition.

Rate Limits 1

Documented rate limits and quota policies.

Rate Limits

0 limits

RATE LIMITS

FinOps 1

Cost, billing, and metering signals for API financial operations.

JSON Schema 2

Standalone JSON Schema definitions for this provider's data models.

GP Record

33 properties

JSON SCHEMA

SATCAT Record

24 properties

JSON SCHEMA

Examples 4

Example request and response payloads for these APIs.

Get Started 2

Portal, sign-up, and the first successful call

Portal

Portal

Login

Documentation 2

Reference material describing how the API behaves

Documentation

Documentation

OpenAPI

OpenAPI

Agent Surfaces 1

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess

AgenticAccess

Design & Contract 1

Pagination, idempotency, versioning, errors, and events

JSONLDContext

JSONLDContext

Access & Security 2

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Authentication

Authentication

Operate 2

Status, limits, changes, and where to get help

Contact

Contact

RateLimits

RateLimits

Commercial 3

Pricing, plans, and the legal terms of use

TermsOfService

TermsOfService

Plans

Plans

FinOps

FinOps

Other 1

Properties that don't map to a standard resource type

Registration

Registration

Source (apis.yml)

name: Space-Track
description: US military space surveillance REST API providing Two-Line Element (TLE) sets, conjunction data messages, orbital
  element sets, satellite catalog data, and decay predictions for tracked satellites and debris operated by the 18th Space
  Control Squadron.
accessModel:
  pricing: free
  onboarding: self-serve
  trial: false
  try_now: true
  public: false
  label: Free · Self-serve signup
  confidence: high
  source:
  - plans
  - authentication
  generated: '2026-07-22'
  method: derived
image: https://www.space-track.org/favicon.ico
tags:
- Space
- Satellites
- TLE
- Orbital Data
- Space Surveillance
- Debris Tracking
- Conjunction Data
- US Military
created: '2026-06-13'
modified: '2026-06-13'
url: https://raw.githubusercontent.com/api-evangelist/spacetrack/refs/heads/main/apis.yml
specificationVersion: '0.23'
apis:
- aid: spacetrack:spacetrack-ancillary-api
  name: Space-Track Ancillary API
  description: Launch sites, boxscore, announcements, and other reference data
  humanURL: https://www.space-track.org
  baseURL: https://www.space-track.org
  tags:
  - Ancillary
  properties:
  - type: OpenAPI
    url: openapi/spacetrack-ancillary-api-openapi.yml
  - type: Documentation
    url: https://www.space-track.org/documentation
  - type: TermsOfService
    url: https://www.space-track.org/documentation#user-agreement
  - type: Plans
    url: https://raw.githubusercontent.com/api-evangelist/spacetrack/refs/heads/main/plans/plans.yml
  - type: RateLimits
    url: https://raw.githubusercontent.com/api-evangelist/spacetrack/refs/heads/main/rate-limits/rate-limits.yml
  - type: FinOps
    url: https://raw.githubusercontent.com/api-evangelist/spacetrack/refs/heads/main/finops/finops.yml
  - type: JSONSchema
    url: https://raw.githubusercontent.com/api-evangelist/spacetrack/refs/heads/main/json-schema/gp-record.json
  - type: JSONSchema
    url: https://raw.githubusercontent.com/api-evangelist/spacetrack/refs/heads/main/json-schema/satcat-record.json
  - type: Vocabulary
    url: https://raw.githubusercontent.com/api-evangelist/spacetrack/refs/heads/main/vocabulary/vocabulary.json
  - type: JSONLDContext
    url: https://raw.githubusercontent.com/api-evangelist/spacetrack/refs/heads/main/json-ld/context.jsonld
- aid: spacetrack:spacetrack-authentication-api
  name: Space-Track Authentication API
  description: Session-based authentication via cookie
  humanURL: https://www.space-track.org
  baseURL: https://www.space-track.org
  tags:
  - Authentication
  properties:
  - type: OpenAPI
    url: openapi/spacetrack-authentication-api-openapi.yml
  - type: Documentation
    url: https://www.space-track.org/documentation
  - type: TermsOfService
    url: https://www.space-track.org/documentation#user-agreement
  - type: Plans
    url: https://raw.githubusercontent.com/api-evangelist/spacetrack/refs/heads/main/plans/plans.yml
  - type: RateLimits
    url: https://raw.githubusercontent.com/api-evangelist/spacetrack/refs/heads/main/rate-limits/rate-limits.yml
  - type: FinOps
    url: https://raw.githubusercontent.com/api-evangelist/spacetrack/refs/heads/main/finops/finops.yml
  - type: JSONSchema
    url: https://raw.githubusercontent.com/api-evangelist/spacetrack/refs/heads/main/json-schema/gp-record.json
  - type: JSONSchema
    url: https://raw.githubusercontent.com/api-evangelist/spacetrack/refs/heads/main/json-schema/satcat-record.json
  - type: Vocabulary
    url: https://raw.githubusercontent.com/api-evangelist/spacetrack/refs/heads/main/vocabulary/vocabulary.json
  - type: JSONLDContext
    url: https://raw.githubusercontent.com/api-evangelist/spacetrack/refs/heads/main/json-ld/context.jsonld
- aid: spacetrack:spacetrack-conjunction-data-api
  name: Space-Track Conjunction Data API
  description: Spaceflight safety conjunction data messages (CDM)
  humanURL: https://www.space-track.org
  baseURL: https://www.space-track.org
  tags:
  - Conjunction Data
  properties:
  - type: OpenAPI
    url: openapi/spacetrack-conjunction-data-api-openapi.yml
  - type: Documentation
    url: https://www.space-track.org/documentation
  - type: TermsOfService
    url: https://www.space-track.org/documentation#user-agreement
  - type: Plans
    url: https://raw.githubusercontent.com/api-evangelist/spacetrack/refs/heads/main/plans/plans.yml
  - type: RateLimits
    url: https://raw.githubusercontent.com/api-evangelist/spacetrack/refs/heads/main/rate-limits/rate-limits.yml
  - type: FinOps
    url: https://raw.githubusercontent.com/api-evangelist/spacetrack/refs/heads/main/finops/finops.yml
  - type: JSONSchema
    url: https://raw.githubusercontent.com/api-evangelist/spacetrack/refs/heads/main/json-schema/gp-record.json
  - type: JSONSchema
    url: https://raw.githubusercontent.com/api-evangelist/spacetrack/refs/heads/main/json-schema/satcat-record.json
  - type: Vocabulary
    url: https://raw.githubusercontent.com/api-evangelist/spacetrack/refs/heads/main/vocabulary/vocabulary.json
  - type: JSONLDContext
    url: https://raw.githubusercontent.com/api-evangelist/spacetrack/refs/heads/main/json-ld/context.jsonld
- aid: spacetrack:spacetrack-decay-predictions-api
  name: Space-Track Decay Predictions API
  description: Satellite reentry and decay predictions
  humanURL: https://www.space-track.org
  baseURL: https://www.space-track.org
  tags:
  - Decay Predictions
  properties:
  - type: OpenAPI
    url: openapi/spacetrack-decay-predictions-api-openapi.yml
  - type: Documentation
    url: https://www.space-track.org/documentation
  - type: TermsOfService
    url: https://www.space-track.org/documentation#user-agreement
  - type: Plans
    url: https://raw.githubusercontent.com/api-evangelist/spacetrack/refs/heads/main/plans/plans.yml
  - type: RateLimits
    url: https://raw.githubusercontent.com/api-evangelist/spacetrack/refs/heads/main/rate-limits/rate-limits.yml
  - type: FinOps
    url: https://raw.githubusercontent.com/api-evangelist/spacetrack/refs/heads/main/finops/finops.yml
  - type: JSONSchema
    url: https://raw.githubusercontent.com/api-evangelist/spacetrack/refs/heads/main/json-schema/gp-record.json
  - type: JSONSchema
    url: https://raw.githubusercontent.com/api-evangelist/spacetrack/refs/heads/main/json-schema/satcat-record.json
  - type: Vocabulary
    url: https://raw.githubusercontent.com/api-evangelist/spacetrack/refs/heads/main/vocabulary/vocabulary.json
  - type: JSONLDContext
    url: https://raw.githubusercontent.com/api-evangelist/spacetrack/refs/heads/main/json-ld/context.jsonld
- aid: spacetrack:spacetrack-general-perturbations-api
  name: Space-Track General Perturbations API
  description: Current and historical SGP4 keplerian element sets (TLE/OMM)
  humanURL: https://www.space-track.org
  baseURL: https://www.space-track.org
  tags:
  - General Perturbations
  properties:
  - type: OpenAPI
    url: openapi/spacetrack-general-perturbations-api-openapi.yml
  - type: Documentation
    url: https://www.space-track.org/documentation
  - type: TermsOfService
    url: https://www.space-track.org/documentation#user-agreement
  - type: Plans
    url: https://raw.githubusercontent.com/api-evangelist/spacetrack/refs/heads/main/plans/plans.yml
  - type: RateLimits
    url: https://raw.githubusercontent.com/api-evangelist/spacetrack/refs/heads/main/rate-limits/rate-limits.yml
  - type: FinOps
    url: https://raw.githubusercontent.com/api-evangelist/spacetrack/refs/heads/main/finops/finops.yml
  - type: JSONSchema
    url: https://raw.githubusercontent.com/api-evangelist/spacetrack/refs/heads/main/json-schema/gp-record.json
  - type: JSONSchema
    url: https://raw.githubusercontent.com/api-evangelist/spacetrack/refs/heads/main/json-schema/satcat-record.json
  - type: Vocabulary
    url: https://raw.githubusercontent.com/api-evangelist/spacetrack/refs/heads/main/vocabulary/vocabulary.json
  - type: JSONLDContext
    url: https://raw.githubusercontent.com/api-evangelist/spacetrack/refs/heads/main/json-ld/context.jsonld
- aid: spacetrack:spacetrack-satellite-catalog-api
  name: Space-Track Satellite Catalog API
  description: Catalog metadata for all tracked Earth-orbiting objects
  humanURL: https://www.space-track.org
  baseURL: https://www.space-track.org
  tags:
  - Satellite Catalog
  properties:
  - type: OpenAPI
    url: openapi/spacetrack-satellite-catalog-api-openapi.yml
  - type: Documentation
    url: https://www.space-track.org/documentation
  - type: TermsOfService
    url: https://www.space-track.org/documentation#user-agreement
  - type: Plans
    url: https://raw.githubusercontent.com/api-evangelist/spacetrack/refs/heads/main/plans/plans.yml
  - type: RateLimits
    url: https://raw.githubusercontent.com/api-evangelist/spacetrack/refs/heads/main/rate-limits/rate-limits.yml
  - type: FinOps
    url: https://raw.githubusercontent.com/api-evangelist/spacetrack/refs/heads/main/finops/finops.yml
  - type: JSONSchema
    url: https://raw.githubusercontent.com/api-evangelist/spacetrack/refs/heads/main/json-schema/gp-record.json
  - type: JSONSchema
    url: https://raw.githubusercontent.com/api-evangelist/spacetrack/refs/heads/main/json-schema/satcat-record.json
  - type: Vocabulary
    url: https://raw.githubusercontent.com/api-evangelist/spacetrack/refs/heads/main/vocabulary/vocabulary.json
  - type: JSONLDContext
    url: https://raw.githubusercontent.com/api-evangelist/spacetrack/refs/heads/main/json-ld/context.jsonld
- aid: spacetrack:spacetrack-tracking-and-impact-prediction-api
  name: Space-Track Tracking and Impact Prediction API
  description: Reentry tracking and impact prediction messages (TIP)
  humanURL: https://www.space-track.org
  baseURL: https://www.space-track.org
  tags:
  - Tracking and Impact Prediction
  properties:
  - type: OpenAPI
    url: openapi/spacetrack-tracking-and-impact-prediction-api-openapi.yml
  - type: Documentation
    url: https://www.space-track.org/documentation
  - type: TermsOfService
    url: https://www.space-track.org/documentation#user-agreement
  - type: Plans
    url: https://raw.githubusercontent.com/api-evangelist/spacetrack/refs/heads/main/plans/plans.yml
  - type: RateLimits
    url: https://raw.githubusercontent.com/api-evangelist/spacetrack/refs/heads/main/rate-limits/rate-limits.yml
  - type: FinOps
    url: https://raw.githubusercontent.com/api-evangelist/spacetrack/refs/heads/main/finops/finops.yml
  - type: JSONSchema
    url: https://raw.githubusercontent.com/api-evangelist/spacetrack/refs/heads/main/json-schema/gp-record.json
  - type: JSONSchema
    url: https://raw.githubusercontent.com/api-evangelist/spacetrack/refs/heads/main/json-schema/satcat-record.json
  - type: Vocabulary
    url: https://raw.githubusercontent.com/api-evangelist/spacetrack/refs/heads/main/vocabulary/vocabulary.json
  - type: JSONLDContext
    url: https://raw.githubusercontent.com/api-evangelist/spacetrack/refs/heads/main/json-ld/context.jsonld
common:
- type: AgenticAccess
  url: agentic-access/spacetrack-agentic-access.yml
- type: DomainSecurity
  url: security/spacetrack-domain-security.yml
- type: Authentication
  url: authentication/spacetrack-authentication.yml
- type: Portal
  url: https://www.space-track.org
- type: Documentation
  url: https://www.space-track.org/documentation
- type: Login
  url: https://www.space-track.org/auth/login
- type: Registration
  url: https://www.space-track.org/auth/createAccount
- type: TermsOfService
  url: https://www.space-track.org/documentation#user-agreement
- type: Contact
  url: https://www.space-track.org/contactus/
- type: Plans
  url: https://raw.githubusercontent.com/api-evangelist/spacetrack/refs/heads/main/plans/plans.yml
- type: RateLimits
  url: https://raw.githubusercontent.com/api-evangelist/spacetrack/refs/heads/main/rate-limits/rate-limits.yml
- type: FinOps
  url: https://raw.githubusercontent.com/api-evangelist/spacetrack/refs/heads/main/finops/finops.yml
- type: OpenAPI
  url: https://raw.githubusercontent.com/api-evangelist/spacetrack/refs/heads/main/openapi/openapi.json
- type: JSONLDContext
  url: https://raw.githubusercontent.com/api-evangelist/spacetrack/refs/heads/main/json-ld/context.jsonld
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com

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