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Beta: The Endgame REST API is in beta and not available to all organizations. Contact support@endgame.io to confirm access for your organization.
The Endgame REST API lets you create and manage threads — the same conversational units that power Endgame Chat — from any HTTP client. Start a thread with a prompt, poll it for the assistant’s response, rename it, list an organization’s threads, or delete one. Use it to embed Endgame directly into your own applications, agents, or back-office automations.

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Base URL

https://app.endgame.io
All endpoints in this reference are rooted at /api/v1.

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The 30-second tour

Authenticate with a user-scoped API key and POST a prompt to /threads. The prompt is required — it’s persisted as the first user message and triggers an assistant response that generates asynchronously. You get back the thread plus the IDs of both messages: 
curl -X POST https://app.endgame.io/api/v1/threads \
  -H "Authorization: Bearer eak_your_api_key_here" \
  -H "Content-Type: application/json" \
  -d '{"prompt": "What accounts does my team own?"}'

{
  "thread": {
    "id": "thr_01HZY6P8RB4K5C7X9E2N8MDQ4T",
    "title": "What accounts does my team own?",
    "createdAt": "2026-04-22T14:32:10.000Z",
    "updatedAt": null,
    "accountId": null,
    "secondaryId": null,
    "published": false,
    "deleted": false,
    "threadUrl": null
  },
  "messageId": "msg_...",
  "responseMessageId": "msg_..."
}
Fetch the thread to watch the assistant’s response fill in: 
curl https://app.endgame.io/api/v1/threads/thr_01HZY6P8RB4K5C7X9E2N8MDQ4T \
  -H "Authorization: Bearer eak_your_api_key_here"
The response includes the thread, every message on it, and a derived status object (idle, in_progress, or error) you can poll until the assistant finishes.

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What’s next

Authentication

How to create and use API keys and M2M credentials.

Endpoints

Reference for the five thread endpoints, with examples, errors, rate limits, and pagination.