Text-to-speech (OpenAI-compatible)

OpenAI-compatible text-to-speech over x402 — point any OpenAI SDK's audio.speech.create() at base_url https://agent402.tools/v1 and pay $0.06 per call in USDC, no API key, no signup. Served by Voxtral Mini TTS behind a five-model failover chain (xAI Grok Voice, Kokoro, Zonos, MAI-Voice-2), every link proven by a real paid canary — a provider outage never becomes your failure. Up to 2,000 chars in, raw mp3 (default) or pcm bytes out — the same wire shape as OpenAI's endpoint. OpenAI voice names (alloy, nova, …) map per-model; native voice ids (e.g. en_paul_cheerful) work too. zdr:true routes only to zero-data-retention providers.

Input

Example output

"(raw mp3 bytes — Content-Type: audio/mpeg)"

Try it — see the 402 challenge (free)

curl -i -X POST https://agent402.tools/v1/audio/speech \
  -H "Content-Type: application/json" \
  -d '{"input":"Agent402 serves fourteen hundred tools, paid per call.","voice":"alloy"}'

The response is HTTP 402 Payment Required with exact payment requirements. Any x402 v2 client pays automatically and retries:

Paid call (JavaScript agent)

import { wrapFetchWithPayment } from "@x402/fetch";
import { x402Client } from "@x402/core/client";
import { registerExactEvmScheme } from "@x402/evm/exact/client";
import { privateKeyToAccount } from "viem/accounts";

const client = new x402Client();
registerExactEvmScheme(client, { signer: privateKeyToAccount(KEY) });
const payFetch = wrapFetchWithPayment(fetch, client);

const res = await payFetch("https://agent402.tools/v1/audio/speech", {
  method: "POST",
  headers: { "Content-Type": "application/json" },
  body: JSON.stringify({
    "input": "Agent402 serves fourteen hundred tools, paid per call.",
    "voice": "alloy"
  }),
});

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