ToolVet
77trust / 100

Audio Transcriptions

by Speech-to-text (OpenAI in AI models & inference

x402 APIPassing, checked 3 h ago

OpenAI's own transcription wire: POST multipart/form-data with a `file` part and get the transcript back. Point any Whisper-shaped SDK at this gateway and pay per call with USDC, no account and no API key. Same model and same four-minute cap as /api/transcribe, which takes a URL instead of an upload; /v1/pro/audio/transcriptions takes it to ten minutes.

POST
https://agent402.tools/v1/audio/transcriptions
Price
$0.03
per call in USDC
Uptime
100%
last 30 days
Response time
328 ms
459 ms slowest 5%
Last check
Passed
3 h ago, next any minute now

Run a free test callHow to call it

Reliability

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

How to call it

POST https://agent402.tools/v1/audio/transcriptions

Each call costs $0.03 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/v1/audio/transcriptions
content-type: application/x-www-form-urlencoded

file=%3Caudio+bytes%2C+multipart+part+named+file%3E&language=en

Parameters

ParameterTypeRequiredDescription
diarizestringNo"true" for speaker labels, word timestamps and language_confidence (the scribe-v2 model)
filestring (binary)YesThe audio file, as a multipart part named `file`
languagestringNoOptional ISO-639-1 hint

Example response

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

{
  "duration": 3.2,
  "model": "gpt-transcribe",
  "text": "Example transcript."
}

Call it from code

The curl command shows the payment challenge. The JavaScript and Python versions pay and call, and never pay more than $0.03.

curl: see the payment challenge
# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i -X POST 'https://agent402.tools/v1/audio/transcriptions' \
  -H 'content-type: application/x-www-form-urlencoded' \
  --data-raw 'file=%3Caudio+bytes%2C+multipart+part+named+file%3E&language=en'

# 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/v1/audio/transcriptions' \
  -H 'content-type: application/x-www-form-urlencoded' \
  --data-raw 'file=%3Caudio+bytes%2C+multipart+part+named+file%3E&language=en' \
  | 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 $0.03 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.03" });
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 $0.03 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fagent402.tools%2Fv1%2Faudio%2Ftranscriptions&method=POST
const res = await pay("https://agent402.tools/v1/audio/transcriptions", {
  method: "POST",
  headers: { "content-type": "application/x-www-form-urlencoded" },
  body: new URLSearchParams([["file","<audio bytes, multipart part named file>"],["language","en"]]),
});
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 $0.03 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.03"})
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/v1/audio/transcriptions",
        data={
            "file": "<audio bytes, multipart part named file>",
            "language": "en",
        },
    )
    print(res.status_code, res.text)

Security scan

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Recent checks

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3 h agoPassed402319 ms$0.03
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