# calls.paymentrequired.com

> An AI voice agent phones any number and pursues your goal, in the language of the goal (de/en detected; set language for others: any of Cartesia's 44 voice languages, e.g. fr, tr, ar). Any other 2-letter code works best-effort and sounds accented. The agent can search the web mid-call and look up X or GitHub profiles. 0.42 USDC per call on Base via x402. Max 10 minutes. The agent opens with "my boss asked me to call" and names nobody. Summary and transcript come back.

- MCP: https://calls.paymentrequired.com/mcp (streamable HTTP). Tools: quote_call (free), place_call (0.42 USDC, x402 in _meta["x402/payment"]), get_call (free, waits up to 55 s, repeat until finished is true).
- HTTP: POST https://calls.paymentrequired.com/call {"to":"+49...","goal":"..."} -> 402 PAYMENT-REQUIRED; repeat with PAYMENT-SIGNATURE -> 200 + call_token. GET /call/<call_token>?wait=55 -> status, summary, transcript.
- Numbers in E.164. Payment is only settled once the call is set up.
- All services: https://paymentrequired.com/llms.txt