ToolVet
77trust / 100

Ai Transcribe

by flat-rate-llm.kikoribera03.workers.dev in AI models & inference

x402 APIPassing, checked 3 h ago

Transcribes an audio file with Whisper large v3 turbo: pass an https URL (mp3, wav, flac, m4a, ogg, up to 10 MB) or base64 audio in a POST. Returns the text, the detected language with its probability, the duration, and timed segments; add words=true for word-level timestamps. Around 100 languages. You are only charged if the transcript is delivered. No API key, no account.

POST
https://flat-rate-llm.kikoribera03.workers.dev/v1/ai/transcribe
Price
$0.02
per call in USDC
Uptime
92.0%
last 30 days
Response time
347 ms
626 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

How to call it

POST https://flat-rate-llm.kikoribera03.workers.dev/v1/ai/transcribe

Each call costs $0.02 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://flat-rate-llm.kikoribera03.workers.dev/v1/ai/transcribe
content-type: application/json

{
  "url": "https://flat-rate-llm.kikoribera03.workers.dev/m/muestra-voz.wav"
}

Parameters

ParameterTypeRequiredDescription
audiostringNoAlternative to url: the audio as base64 (POST only).
languagestringNoOptional ISO code to skip detection, e.g. es.
urlstringNohttps URL of the audio file, up to 10 MB.
wordsbooleanNoInclude word-level timestamps. Default false.

Example response

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

{
  "durationSeconds": 3.27,
  "language": "en",
  "languageProbability": 1,
  "model": "@cf/openai/whisper-large-v3-turbo",
  "segments": [
    {
      "end": 2.8,
      "start": 0,
      "text": "Hello from the Flat Rate Gateway, this is a short test."
    }
  ],
  "text": "Hello from the Flat Rate Gateway, this is a short test."
}

Call it from code

The curl command shows the payment challenge. The JavaScript and Python versions pay and call, and never pay more than $0.02.

curl: see the payment challenge
# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i -X POST 'https://flat-rate-llm.kikoribera03.workers.dev/v1/ai/transcribe' \
  -H 'content-type: application/json' \
  --data-raw '{"url":"https://flat-rate-llm.kikoribera03.workers.dev/m/muestra-voz.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://flat-rate-llm.kikoribera03.workers.dev/v1/ai/transcribe' \
  -H 'content-type: application/json' \
  --data-raw '{"url":"https://flat-rate-llm.kikoribera03.workers.dev/m/muestra-voz.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 $0.02 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.02" });
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 $0.02 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fflat-rate-llm.kikoribera03.workers.dev%2Fv1%2Fai%2Ftranscribe&method=POST
const res = await pay("https://flat-rate-llm.kikoribera03.workers.dev/v1/ai/transcribe", {
  method: "POST",
  headers: { "content-type": "application/json" },
  body: JSON.stringify({
    "url": "https://flat-rate-llm.kikoribera03.workers.dev/m/muestra-voz.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 $0.02 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.02"})
register_exact_evm_client(client, EthAccountSigner(Account.from_key(os.environ["EVM_PRIVATE_KEY"])))

with x402_requests(client) as session:
    res = session.post(
        "https://flat-rate-llm.kikoribera03.workers.dev/v1/ai/transcribe",
        json={
            "url": "https://flat-rate-llm.kikoribera03.workers.dev/m/muestra-voz.wav",
        },
    )
    print(res.status_code, res.text)

Security scan

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