ToolVet
81trust / 100

Tts

by Text-to-speech in AI models & inference

x402 APIPassing, checked 4 h ago

Convert text to speech with the eleven-v4-turbo model: returns audio (the base64-encoded file in the format asked for: mp3, opus, aac, flac, wav or pcm) with model, voice, format and chars (the characters spoken). The ten standard voice names each map to their own voice, or name one of 21 named voices directly; the answer names the voice that spoke. 90+ languages.

POST
https://agent402.tools/api/tts
Price
$0.12
per call in USDC
Uptime
100%
last 30 days
Response time
221 ms
405 ms slowest 5%
Last check
Passed
4 h ago, next any minute now

Run a free test callHow to call it

Reliability

All checks passedSome failedAll failedNot checked

Status and outage history · Atom feed · Watch with other listings

How to call it

POST https://agent402.tools/api/tts

Each call costs $0.12 in USDC on Base, paid with the request over x402.

Run a free test callOne unpaid request, the way an agent sends it. You see the payment challenge it gets back. Nothing is charged.

Example request

From the listing.

POST https://agent402.tools/api/tts
content-type: application/json

{
  "format": "mp3",
  "text": "Hello from Agent402!",
  "voice": "alloy"
}

Parameters

ParameterTypeRequiredDescription
formatstringNoAudio format: mp3, opus, aac, flac, wav, pcm (default: mp3)
textstringYesText to convert to speech (max 2000 chars)
voicestringNoVoice: alloy, ash, ballad, coral, echo, fable, nova, onyx, sage, shimmer (default: alloy), each mapped to its own voice, or a named voice (george, sarah, adam, alice, bella, bill, brian, callum, charlie, chris, daniel, eric, harry, jessica, laura, liam, lily, matilda, river, roger, will)

Example response

The provider's example. We can't check it without paying.

{
  "audio": "<base64-encoded audio>",
  "chars": 20,
  "format": "mp3",
  "model": "elevenlabs/eleven-v4-turbo",
  "provider": "openrouter",
  "voice": "river"
}

Call it from code

The curl command shows the payment challenge. The JavaScript and Python versions pay and call, and never pay more than $0.12.

curl: see the payment challenge
# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i -X POST 'https://agent402.tools/api/tts' \
  -H 'content-type: application/json' \
  --data-raw '{"format":"mp3","text":"Hello from Agent402!","voice":"alloy"}'

# x402 v2 sends the challenge base64-encoded in the PAYMENT-REQUIRED header (v1 sends it in the body).
# To read the header:
curl -sS -g -o /dev/null -D - -X POST 'https://agent402.tools/api/tts' \
  -H 'content-type: application/json' \
  --data-raw '{"format":"mp3","text":"Hello from Agent402!","voice":"alloy"}' \
  | grep -i '^payment-required:' | cut -d' ' -f2 | tr -d '\r' | base64 --decode
JavaScript: pay and call
// npm i @x402/fetch @x402/evm viem
import { wrapFetchWithPayment, x402Client } from "@x402/fetch";
import { registerExactEvmScheme } from "@x402/evm/exact/client";
import { privateKeyToAccount } from "viem/accounts";

// Pays at most $0.12 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.12" });
registerExactEvmScheme(client, { signer: privateKeyToAccount(process.env.EVM_PRIVATE_KEY) });
const pay = wrapFetchWithPayment(fetch, client);

// Not sure it's safe to pay? ToolVet checks it first for $0.005. Pay for that from a separate
// client: this one is capped at $0.12 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fagent402.tools%2Fapi%2Ftts&method=POST
const res = await pay("https://agent402.tools/api/tts", {
  method: "POST",
  headers: { "content-type": "application/json" },
  body: JSON.stringify({
    "format": "mp3",
    "text": "Hello from Agent402!",
    "voice": "alloy"
  }),
});
console.log(res.status, await res.text());
Python: pay and call
# pip install "x402[requests,evm]"
import os
from eth_account import Account
from x402 import x402ClientSync
from x402.http.clients import x402_requests
from x402.mechanisms.evm import EthAccountSigner
from x402.mechanisms.evm.exact.register import register_exact_evm_client

# Pays at most $0.12 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.12"})
register_exact_evm_client(client, EthAccountSigner(Account.from_key(os.environ["EVM_PRIVATE_KEY"])))

with x402_requests(client) as session:
    res = session.post(
        "https://agent402.tools/api/tts",
        json={
            "format": "mp3",
            "text": "Hello from Agent402!",
            "voice": "alloy",
        },
    )
    print(res.status_code, res.text)

Security scan

No findings

We scan names, descriptions and tool definitions for hidden instructions and other prompt-injection patterns.

Recent checks

WhenResultHTTPTimePrice
4 h agoPassed402201 ms$0.12
8 h agoPassed402215 ms$0.12
13 h agoPassed402193 ms$0.12
17 h agoPassed402194 ms$0.12
21 h agoPassed402196 ms$0.12
Show 10 older checks
25 h agoPassed402275 ms$0.12
29 h agoPassed402188 ms$0.12
33 h agoPassed402190 ms$0.12
37 h agoPassed402188 ms$0.12
41 h agoPassed402189 ms$0.12
45 h agoPassed402206 ms$0.12
2 days agoPassed402189 ms$0.12
2 days agoPassed402221 ms$0.12
2 days agoPassed402338 ms$0.12
3 days agoPassed402204 ms$0.12

History

11 Oct 2026Price changed from $0.05 to $0.12