Transcribe long audio: up to 60 minutes of MP3 or WAV, with subtitles

$0.05 per call · failed calls are never charged · no account needed: a card key or USDC

Transcribe a podcast, meeting, interview or lecture: up to 60 minutes of MP3 or WAV (25 MB) by URL or uploaded in a POST body, 90+ languages, Whisper large-v3-turbo. Parts are joined, so subtitles=srt or vtt and timestamps=true cover the whole recording; longer audio is refused before anything runs. Use for meeting notes, podcast show notes, video subtitles and interviews; for a short clip in any format, transcribe costs less.

Buy credits by card (from $1) Example result (JSON)

Inputs

NameTypeDescription
url (required)stringAbsolute http(s) URL of an MP3 or WAV file (max 25 MB, 60 minutes); or POST the file itself (raw body, multipart `file` part, or base64 in JSON)
subtitlesstringsrt or vtt: also return subtitle text for the whole recording
timestampsstringtrue: also return timed segments and words
languagestringSpoken language code such as en, sv or de (default: detected per part)

Request

Over HTTP, with a card key from /credits:

curl -H "Authorization: Bearer adt_…" "https://tools.funwords.eu/transcribe/long?url=https%3A%2F%2Fupload.wikimedia.org%2Fwikipedia%2Fcommons%2F7%2F77%2FTofino_pronunciation.mp3"

Without a key, the same URL answers 402 Payment Required with x402 and MPP terms, so an agent with a wallet pays per call in USDC (Base, Polygon, Arbitrum or Solana over x402; Base or Tempo over MPP) and retries.

Example result

{
  "url": "https://upload.wikimedia.org/wikipedia/commons/7/77/Tofino_pronunciation.mp3",
  "format": "mp3",
  "durationSeconds": 1,
  "parts": 1,
  "text": "Tofino.",
  "language": "en",
  "wordCount": 1,
  "model": "@cf/openai/whisper-large-v3-turbo"
}

From an AI agent (MCP)

Add the MCP server to Claude, Cursor or any MCP client. This tool is transcribe_long, and the first 25 successful calls are free:

https://tools.funwords.eu/mcp

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