ISS Location API (Open Notify) website screenshot

ISS Location API (Open Notify)

Open Notify is a free, open-source project by Nathan Bergey that exposes real-time NASA and ISS data as simple REST endpoints. The service provides the current latitude and longitude of the International Space Station (updated every five seconds as the ISS travels at roughly 28,000 km/h), a count and roster of all humans currently in space across all spacecraft, and historical ISS pass-time predictions for any point on Earth. All endpoints are unauthenticated, return JSON, and are free to use without registration. The ISS pass-time prediction endpoint has been retired; the location and astronaut endpoints remain live and operational.

ISS Location API (Open Notify) publishes 2 APIs on the APIs.io network: Astronauts API and ISS Location API. Tagged areas include Space, ISS, International Space Station, NASA, and Location.

The ISS Location API (Open Notify) catalog on APIs.io includes 1 JSON-LD context and 1 Spectral governance ruleset.

ISS Location API (Open Notify)’s developer surface includes documentation and 7 more developer resources.

39.7/100 thin ▬ flat Agent 28/100 agent aware Full breakdown ↓
scored 2026-07-28 · rubric v0.6
AccessFreeOpen⚡ Free to try
3 APIs
SpaceISSInternational Space StationNASALocationGeolocationAstronautsReal-TimeOpen SourcePublic APIFree

Kin Score

Kin Score Kin Score How this is scored →
scored 2026-07-28 · rubric v0.6
Composite quality — 39.7/100 · thin
Contract Quality 14.4 / 25
Developer Ergonomics 1.7 / 20
Commercial Clarity 5.8 / 20
Operational Transparency 3.4 / 13
Governance 7.0 / 12
Discoverability 7.4 / 10
Agent readiness — 28/100 · agent aware
Machine-Readable Contract 18 / 18
Agentic Access Contract 10 / 10
MCP Server 0 / 12
Machine-Readable Auth 0 / 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
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/iss-api: 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 3

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

People in Space Right Now

Returns a JSON object containing the total count of humans currently in space and an array of crew member objects, each with the person's name and the spacecraft they are aboard...

ISS Location API (Open Notify) Astronauts API

Endpoints for retrieving information about humans currently in space

ISS Location API (Open Notify) ISS Location API

Endpoints for retrieving the current position of the International Space Station

Pricing Plans 1

Published pricing tiers and plan structures.

Iss Api Plans

1 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Iss Api Rate Limits

2 limits

RATE LIMITS

FinOps 1

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

Semantic Vocabularies 1

JSON-LD contexts and semantic vocabularies used across these APIs.

context Context

0 classes · 9 properties

JSON-LD

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

ISS Location API (Open Notify) API Rules

5 rules · 4 warnings 1 info

SPECTRAL

JSON Schema 2

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

Astronauts Response

3 properties

JSON SCHEMA

ISS Location Response

3 properties

JSON SCHEMA

Examples 2

Example request and response payloads for these APIs.

Astronauts Response

3 fields

EXAMPLE

Iss Location Response

3 fields

EXAMPLE

Security Posture 1

Authentication, domain security, vulnerability disclosure, and trust-center signals.

Iss Api Domain Security

no transport/DNS hardening detected

SECURITY

Agentic Access 1

Recommended x-agentic-access execution contracts for AI agents.

Iss Api Agentic Access

4 operations

4 operations · 0 acting

AGENTIC

Resources

Documentation 2

Reference material describing how the API behaves

Agent Surfaces 1

MCP servers, agent skills, and machine-readable catalogs

Build 2

SDKs, sample code, and the tooling you integrate with

Access & Security 1

Authentication, authorization, and security posture

Commercial 1

Pricing, plans, and the legal terms of use

Company 1

The organization behind the API

Source (apis.yml)

apis.yml Raw ↑
aid: iss-api
url: https://raw.githubusercontent.com/api-evangelist/iss-api/refs/heads/main/apis.yml
name: ISS Location API (Open Notify)
kind: API
description: Open Notify is a free, open-source project by Nathan Bergey that exposes real-time NASA and ISS data as simple
  REST endpoints. The service provides the current latitude and longitude of the International Space Station (updated every
  five seconds as the ISS travels at roughly 28,000 km/h), a count and roster of all humans currently in space across all
  spacecraft, and historical ISS pass-time predictions for any point on Earth. All endpoints are unauthenticated, return JSON,
  and are free to use without registration. The ISS pass-time prediction endpoint has been retired; the location and astronaut
  endpoints remain live and operational.
accessModel:
  pricing: free
  onboarding: open
  trial: false
  try_now: true
  public: true
  label: Free · Open access
  confidence: medium
  source:
  - plans
  generated: '2026-07-22'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/iss-api.png
tags:
- Space
- ISS
- International Space Station
- NASA
- Location
- Geolocation
- Astronauts
- Real-Time
- Open Source
- Public API
- Free
created: '2026-06-13'
modified: '2026-06-13'
specificationVersion: '0.19'
apis:
- aid: iss-api:astronauts-in-space
  name: People in Space Right Now
  description: Returns a JSON object containing the total count of humans currently in space and an array of crew member objects,
    each with the person's name and the spacecraft they are aboard. Covers all crewed spacecraft, not only the ISS. Requires
    no parameters or authentication.
  image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg
  humanURL: http://open-notify.org/Open-Notify-API/People-In-Space/
  baseURL: http://api.open-notify.org
  tags:
  - Astronauts
  - Crew
  - People in Space
  - ISS
  - Real-Time
  properties:
  - type: Documentation
    url: http://open-notify.org/Open-Notify-API/People-In-Space/
  - type: GitHubRepository
    url: https://github.com/open-notify/Open-Notify-API
  contact:
  - FN: Open Notify
    url: http://open-notify.org/
- aid: iss-api:iss-api-astronauts-api
  name: ISS Location API (Open Notify) Astronauts API
  description: Endpoints for retrieving information about humans currently in space
  humanURL: http://open-notify.org/Open-Notify-API/ISS-Location-Now/
  baseURL: http://api.open-notify.org
  tags:
  - Astronauts
  properties:
  - type: OpenAPI
    url: openapi/iss-api-astronauts-api-openapi.yml
  - type: Documentation
    url: http://open-notify.org/Open-Notify-API/ISS-Location-Now/
  - type: GitHubRepository
    url: https://github.com/open-notify/Open-Notify-API
- aid: iss-api:iss-api-iss-location-api
  name: ISS Location API (Open Notify) ISS Location API
  description: Endpoints for retrieving the current position of the International Space Station
  humanURL: http://open-notify.org/Open-Notify-API/ISS-Location-Now/
  baseURL: http://api.open-notify.org
  tags:
  - ISS Location
  properties:
  - type: OpenAPI
    url: openapi/iss-api-iss-location-api-openapi.yml
  - type: Documentation
    url: http://open-notify.org/Open-Notify-API/ISS-Location-Now/
  - type: GitHubRepository
    url: https://github.com/open-notify/Open-Notify-API
common:
- type: AgenticAccess
  url: agentic-access/iss-api-agentic-access.yml
- type: DomainSecurity
  url: security/iss-api-domain-security.yml
- type: Website
  url: http://open-notify.org/
- type: Documentation
  url: http://open-notify.org/Open-Notify-API/
- type: GitHubRepository
  url: https://github.com/open-notify/Open-Notify-API
- type: GitHubOrganization
  url: https://github.com/open-notify
- type: ReadTheDocs
  url: https://open-notify-api.readthedocs.io/en/latest/
- type: License
  url: https://github.com/open-notify/Open-Notify-API/blob/master/LICENSE
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com