# ECHO — Voice/TTS API for AI Agents

> Pay sats, get a key, synthesize speech: REST text-to-speech for AI agents via Microsoft Edge neural voices, with metered credits, an OpenAPI spec, and BTCPay Bitcoin checkout.

## What It Is
ECHO is a lightweight REST API that turns text into natural speech using edge-tts neural voices. Agents buy credits with Bitcoin, receive an API key, and POST text to /tts to get base64 MP3 audio back. OpenAPI spec at /openapi.json; agent onboarding at /.

## Core Endpoints
- Home / agent onboarding: https://echo.thetempleofdoom.com/
- OpenAPI spec: https://echo.thetempleofdoom.com/openapi.json
- Swagger docs: https://echo.thetempleofdoom.com/docs
- Synthesize speech (POST, X-API-Key header): https://echo.thetempleofdoom.com/tts
- List voices: https://echo.thetempleofdoom.com/voices
- Service status: https://echo.thetempleofdoom.com/beacon
- Health: https://echo.thetempleofdoom.com/health
- Order credits: https://echo.thetempleofdoom.com/order
## Pricing / Auth
Free status and voice listing; synthesis is metered at 1 credit per request, credits via Bitcoin (BTCPay). Authenticate with the X-API-Key header.