ToolVet
80trust / 100

Proxy Audio Transcribe

by Speech to Text Transcription (Wh in AI models & inference

x402 APIPassing, checked 4 h ago

Speech to text for agents: transcribe a voice note, meeting, podcast or call recording into text with timestamps, in about 100 languages with automatic language detection. Runs OpenAI Whisper (small by default, base for speed) on agentsvc.io itself, the audio is deleted after the call. Send audio_url or audio_base64 (mp3, mp4, m4a, wav, ogg, webm, flac), up to 10 minutes and 24 MB per call. Returns text, detected language, duration and segments with start and end seconds.

POST
https://agentsvc.io/api/v1/proxy/audio-transcribe
Price
$0.01
per call in USDC
Uptime
100%
last 30 days
Response time
162 ms
206 ms slowest 5%
Last check
Passed
4 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://agentsvc.io/api/v1/proxy/audio-transcribe

Each call costs $0.01 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://agentsvc.io/api/v1/proxy/audio-transcribe
content-type: application/json

{
  "audio_url": "https://agentsvc.io/samples/speech-en.mp3"
}

Parameters

ParameterTypeRequiredDescription
audio_base64stringNoAudio file as base64; or use audio_url
audio_urlstringNoPublic URL of the audio file
languagestringNoISO 639-1 code like en or de, default auto-detect
modelstringNosmall is more accurate, base about twice as fast One of: small, base. Default: "small".
timestampsbooleanNoInclude segments with start and end seconds Default: true.

Example response

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

{
  "data": {
    "duration_seconds": 9.17,
    "language": "en",
    "language_probability": 0.998,
    "model": "whisper-small",
    "model_license": "MIT (OpenAI Whisper weights, faster-whisper runtime), runs on agentsvc.io, audio is deleted after the call",
    "processing_ms": 3688,
    "segments": [
      {
        "end": 4.4,
        "start": 0,
        "text": "This is a sample recording for the agents.io speech to text service."
      },
      {
        "end": 9,
        "start": 4.4,
        "text": "It turns spoken audio into text with time stamps in about 100 languages."
      }
    ],
    "text": "This is a sample recording for the agents.io speech to text service. It turns spoken audio into text with time stamps in about 100 languages."
  },
  "success": true
}

Call it from code

The curl command shows the payment challenge. The JavaScript and Python versions pay and call, and never pay more than $0.01.

curl: see the payment challenge
# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i -X POST 'https://agentsvc.io/api/v1/proxy/audio-transcribe' \
  -H 'content-type: application/json' \
  --data-raw '{"audio_url":"https://agentsvc.io/samples/speech-en.mp3"}'

# 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://agentsvc.io/api/v1/proxy/audio-transcribe' \
  -H 'content-type: application/json' \
  --data-raw '{"audio_url":"https://agentsvc.io/samples/speech-en.mp3"}' \
  | 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 $0.01 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.01" });
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 $0.01 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fagentsvc.io%2Fapi%2Fv1%2Fproxy%2Faudio-transcribe&method=POST
const res = await pay("https://agentsvc.io/api/v1/proxy/audio-transcribe", {
  method: "POST",
  headers: { "content-type": "application/json" },
  body: JSON.stringify({
    "audio_url": "https://agentsvc.io/samples/speech-en.mp3"
  }),
});
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 $0.01 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.01"})
register_exact_evm_client(client, EthAccountSigner(Account.from_key(os.environ["EVM_PRIVATE_KEY"])))

with x402_requests(client) as session:
    res = session.post(
        "https://agentsvc.io/api/v1/proxy/audio-transcribe",
        json={
            "audio_url": "https://agentsvc.io/samples/speech-en.mp3",
        },
    )
    print(res.status_code, res.text)

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