API reference

Every endpoint, parameter and response of the LeapFun text to speech API, rendered from the live OpenAPI document at https://api.leapfun.ai/v1/openapi.json. Requests use Authorization: Bearer lf_sk_... with a key from Settings → Developer API in the app.

Overview and quickstart openapi.json

Endpoints at a glance

POST /v1/tts — generate speech from text with engine, voice and an optional director's note; returns MP3 bytes with X-Job-Id, X-Credits-Used, X-Engine and X-RateLimit-* headers.
POST /v1/audio/speech — the OpenAI-compatible route: model, voice, input, optional instructions.
GET /v1/voices — the voice catalog, your cloned and designed voices included.
GET /v1/engines — the four engines and their billing.
GET /v1/usage — credit balance and this period's spend.

Errors are JSON: {"error": {"type", "code", "message", "param", "request_id"}}. 402 insufficient_credits, 403 plan_required, 413 text_too_long, 429 rate_limited with Retry-After.