ToolVet
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Transcribe Pro

by Speech-to-text (Pro) in AI models & inference

x402 APIPassing, checked 20 min ago

Transcribe audio to text with the gpt-transcribe model - the same model as /api/transcribe with a longer cap. Provide a URL to an audio file and get back the transcript; add diarize:true for speaker labels, word timestamps and a language confidence score (the scribe-v2 model). No API key needed; pay per call via x402. Max 10 minutes of audio, 25 MB file size.

POST
https://agent402.tools/api/transcribe-pro
Price
$0.1
per call in USDC
Uptime
100%
last 30 days
Response time
221 ms
352 ms slowest 5%
Last check
Passed
20 min ago, next in 10 min

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/api/transcribe-pro

Each call costs $0.1 in USDC on Polygon, 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/transcribe-pro
content-type: application/json

{
  "url": "https://agent402.tools/fixtures/sample-speech.wav"
}

Parameters

ParameterTypeRequiredDescription
diarizebooleanNotrue: transcribe with the scribe-v2 model and add speaker labels and word timestamps (`words`, `speakers`) and `language_confidence` (0 to 1, the model's confidence in the detected language). Same price and cap. Default false
languagestringNoOptional ISO-639-1 language code (e.g. 'en', 'es', 'fr') for better accuracy
urlstringYesURL of the audio file to transcribe (mp3, wav, m4a, ogg, flac, webm)

Example response

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

{
  "duration": 12.6,
  "language": "en",
  "model": "gpt-transcribe",
  "provider": "openai",
  "text": "Hi, this is the Agent402 sample recording. Can you hear me clearly? Yes, loud and clear. There are two of us on this clip, so the transcript can tell us apart."
}

Call it from code

The curl command shows the payment challenge. The JavaScript and Python versions pay and call, and never pay more than $0.1.

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/transcribe-pro' \
  -H 'content-type: application/json' \
  --data-raw '{"url":"https://agent402.tools/fixtures/sample-speech.wav"}'

# 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/transcribe-pro' \
  -H 'content-type: application/json' \
  --data-raw '{"url":"https://agent402.tools/fixtures/sample-speech.wav"}' \
  | 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 $0.1 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.1" });
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 $0.1 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fagent402.tools%2Fapi%2Ftranscribe-pro&method=POST
const res = await pay("https://agent402.tools/api/transcribe-pro", {
  method: "POST",
  headers: { "content-type": "application/json" },
  body: JSON.stringify({
    "url": "https://agent402.tools/fixtures/sample-speech.wav"
  }),
});
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 $0.1 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.1"})
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/transcribe-pro",
        json={
            "url": "https://agent402.tools/fixtures/sample-speech.wav",
        },
    )
    print(res.status_code, res.text)

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