Developers

Build on loudly

One REST API and one MCP server, over the same core the app runs on — so a script or an agent is bound by exactly the same plan, safety, and credit rules as a person in the app.

Get started

  1. 1. Mint a key in Settings → Developers — it's shown once.
  2. 2. Send it on every request as Authorization: Bearer sk_live_…
  3. 3. Call GET /api/v1/me to confirm, then follow the REST guide.
Guide
REST API guide

Authenticate, a publish-your-first-card quickstart, the endpoints, concepts, errors, and rate limits.

Guide
MCP server guide

Connect an AI agent over MCP — a bearer key for dev clients, Clerk OAuth for the Claude app.

Spec
OpenAPI spec

The full OpenAPI 3.1 description — every request and response shape. Import it into Postman, Insomnia, or Bruno, or generate a client from it.