Voxel Worlds API — free mock REST API for testing

An original block-building sandbox inspired by voxel games. Practice world seeds, coordinate resources, inventory conflicts and optimistic concurrency.

The Voxel Worlds API models block worlds with players, inventories and integer coordinates. Coordinates are bounded, so it is a compact place to practise boundary testing — the off-by-one at the edge of a valid range, which is the class of bug that unit tests catch and integration tests usually do not.

Base URL: https://funapi.dev/api/voxel/v1 · 6 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/voxel/v1/worlds — List worlds. No token, no signup:

curl -i https://funapi.dev/api/voxel/v1/worlds

answers 200 OK with:

{
  "total": 1,
  "data": [
    {
      "id": 1,
      "name": "Blockshire",
      "seed": 424242,
      "biome": "meadow",
      "difficulty": "normal",
      "_v": 1
    }
  ]
}

Open and run this endpoint

What you can practise here

• Place a block exactly on the world boundary, then one block past it, and compare the two responses.
• Add an item beyond a player's inventory capacity and read the error.
• Join a world that is full and check the conflict.
• Send a floating-point coordinate where an integer is required and read the validation failure.

worlds

procedural block worlds

• GET /voxel/v1/worlds — List worlds · Responds with 200 Link to this endpoint
• GET /voxel/v1/worlds/{id} — Get a world · Responds with 200 404 Link to this endpoint
• POST /voxel/v1/worlds — Generate a world from a seed (requires Bearer auth) · Responds with 201 400 401 Link to this endpoint
• GET /voxel/v1/worlds/{id}/blocks/{x}/{y}/{z} — Inspect a block at coordinates · Responds with 200 404 Link to this endpoint

players

survival stats and inventory

• GET /voxel/v1/players — List players · Responds with 200 Link to this endpoint
• POST /voxel/v1/players/{id}/inventory — Add an inventory item (409 on duplicate) (requires Bearer auth) · Responds with 200 404 409 Link to this endpoint

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All 39 mock REST APIs

Last updated 6 September 2026