Space Agency API — free mock REST API for testing

Run a small space program: schedule launches, scrub them for weather, and actually light the candle — a slow, risky operation that sometimes aborts. Probe pings take seconds, ideal for exercising client timeouts.

The Space Agency API launches rockets, scrubs launches and talks to probes with a deliberate signal delay measured in seconds. The slow probe endpoints exist so you can test timeouts against something that genuinely takes time, rather than mocking a delay and hoping your client behaves the same way.

Base URL: https://funapi.dev/api/space/v1 · 9 endpoints · OpenAPI 3.1 spec and Postman collection available. New here? Read the getting started guide.

Example request and response

GET https://funapi.dev/api/space/v1/launches — List launches, filter by status. No token, no signup:

curl -i https://funapi.dev/api/space/v1/launches

answers 200 OK with:

{
  "total": 3,
  "data": [
    {
      "id": 1,
      "mission": "Artemis Redux",
      "vehicle": "Kestrel IX",
      "window": "2026-08-01T12:00:00Z",
      "status": "scheduled",
      "scrubCount": 0
    },
    {
      "id": 2,
      "mission": "Red Rover Resupply",
      "vehicle": "Pelican Heavy",
      "window": "2026-07-04T04:30:00Z",
      "status": "launched",
      "scrubCount": 1
    },
    {
      "id": 3,
      "mission": "Solar Sail Trials",
      "vehicle": "Kestrel IX",
      "window": "2026-06-20T22:00:00Z",
      "status": "scrubbed",
      "scrubCount": 3
    }
  ]
}

Open and run this endpoint

What you can practise here

• Call a probe endpoint with a client timeout shorter than the signal lag and confirm the timeout actually fires.
• Schedule a launch, scrub it, and try to scrub it again for the conflict.
• Assign crew beyond a mission's capacity and read the error.
• Request telemetry for a probe that is out of range and handle the failure.

launches

countdowns and scrubs

• GET /space/v1/launches — List launches, filter by status · Responds with 200 400 Link to this endpoint
• GET /space/v1/launches/{id} — Get one launch · Responds with 200 404 Link to this endpoint
• POST /space/v1/launches — Schedule a launch (requires Bearer auth) · Responds with 201 400 401 Link to this endpoint
• POST /space/v1/launches/{id}/scrub — Scrub a scheduled launch (requires Bearer auth) · Responds with 200 401 404 409 Link to this endpoint
• POST /space/v1/launches/{id}/launch — Light the candle — slow & occasionally aborts (admin only) (requires Bearer auth) · Responds with 200 401 403 404 409 Link to this endpoint
• GET /space/v1/launches/{id}/countdown — T-minus for a scheduled launch · Responds with 200 404 409 Link to this endpoint

crew

astronauts on the roster

• GET /space/v1/astronauts — List astronauts · Responds with 200 Link to this endpoint
• GET /space/v1/astronauts/{id} — Get one astronaut · Responds with 200 404 Link to this endpoint

probes

deep space, slow answers

• GET /space/v1/probes/{id}/ping — Ping a deep-space probe — takes ~3s · Responds with 200 404 Link to this endpoint

Related APIs

• Superhero API — Heroes, powers & nemeses. Great for nested resources.
• Dino Park API — Dinosaurs, enclosures & the occasional breach.

All 39 mock REST APIs

Use this response elsewhere

• JSON to TypeScript on fundata.dev — an interface for this response
• JSON to Zod on fundata.dev — a runtime validator for it
• mock API data on fundata.dev — thousands of records of the same shape for your own fixtures

Last updated 2 October 2026