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FastX402 Audio Transcription
x402
FastX402 Audio Transcription is a paid API for AI agents from fastx402.tools, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-17).
Transcribes an audio file (mp3, m4a, wav, ogg, webm, flac) at a given URL into text with timestamps and language detection, paid per-call in USDC via x402.
Price / call$0.01
Success—
StatusUnknown
How this service works
146 pay-per-call tools for AI agents, from $0.001 per request in USDC on Base or Solana with x402. No account, no API key.
Output
A JSON object containing the full transcript text, the detected or specified language code (e.g. 'en', 'tr'), an array of timed segments each with start time, end time, and segment text, and the total audio duration in seconds.
Example use cases
Podcast episode transcript extraction
“Transcribe this podcast episode into text with timestamps — the mp3 is at https://media.mypodcast.com/ep100.mp3. Auto-detect the language.”
Multilingual voice memo to text
“I have a Turkish voice memo at https://storage.example.com/memo.m4a — can you transcribe it into text? The language is Turkish (tr).”
Meeting recording caption generation
“Please convert this meeting recording to a timestamped transcript: https://recordings.company.com/standup_2024-06-01.wav. I need the full text and each segment's start and end times.”
Technical details
Endpoint
GEThttps://fastx402.tools/transcribe?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need fast, pay-per-call audio-to-text transcription without setting up an API key or account. It's ideal for AI agents that need occasional or sporadic transcription of publicly accessible audio files in multiple formats and languages, billed precisely per request in USDC on Base. Prefer it over subscription-based services when cost predictability at low volume matters, or when you need automatic language detection alongside timestamped segments.
Side effects
- Unreachable or invalid audio URL returns an error (file must be a publicly accessible http/https link)
- Unsupported file format (only mp3, m4a, wav, ogg, webm, flac accepted) causes a rejection
- Very long audio files may exceed processing limits or increase latency significantly
- Incorrect language code provided causes degraded transcription quality
- Payment failure via x402 (insufficient USDC balance or unsupported wallet) blocks the request
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"text": "And so my fellow Americans ask not what your country can do for you, ask what you can do for your country.",
"language": "en",
"segments": [
{
"end": 10.5,
"text": "And so my fellow Americans ask not what your country can do for you, ask what you can do for your country.",
"start": 0
}
],
"duration_s": 11
}
}Tags
x402
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