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Agent Tools UK — Audio/Video Transcription (Whisper)
x402
Agent Tools UK — Audio/Video Transcription (Whisper) is a paid API for AI agents from agent-tools-production-e6aa.up.railway.app, paid per call via x402, $0.03/call, status unknown (last checked 2026-10-15).
Transcribes speech from an audio or video file (up to 15 minutes) using Whisper, returning full text, detected language, duration, and timestamped segments.
Price / call$0.03
Success—
StatusUnknown
How this service works
Transcribe speech from an audio or video file (mp3, m4a, wav, ogg, mp4, webm) up to 15 minutes, using Whisper. Language is detected automatically. Use when you need the words from a voice note, meeting, podcast clip or video. Send {url} or {base64}, optional language (2-letter code). Returns {language, duration, text, segments with start/end times}. Errors: 413 over 15 minutes, 422 not audio.
Output
Returns a JSON object containing: the detected language code, total audio duration in seconds, full transcript text as a single string, and an array of segments each with start time, end time, and the spoken text for that segment.
Example use cases
Transcribe a team meeting recording
“I have a recording of our team standup from this morning at https://storage.example.com/standup-2024-01-15.m4a — can you transcribe it and give me the full text with timestamps so I can pull out action items?”
Caption a customer video testimonial
“Please transcribe this customer testimonial video at https://cdn.example.com/testimonial.mp4 — I need the words and segment timings so I can add captions to it.”
Convert a voice memo to written notes
“I recorded a quick voice memo with some ideas and saved it as a base64 string — can you transcribe it for me? The language should be Spanish (es) if that helps.”
Technical details
Endpoint
POSThttps://agent-tools-production-e6aa.up.railway.app/v1/transcribe?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need accurate speech-to-text with automatic language detection and timestamped segment output from common audio/video formats (mp3, m4a, wav, ogg, mp4, webm) up to 15 minutes. Prefer it over generic STT services when you need both full text and per-segment timestamps in a single call, and when you want Whisper-quality multilingual transcription without managing your own Whisper infrastructure.
Side effects
- 413 error if the audio or video file exceeds 15 minutes in length
- 422 error if the file is not a recognised audio or video format
- File fetch failure if the provided URL is not publicly accessible
- Base64 decode error if the encoded content is malformed or too large (>20 MB)
- Low accuracy if audio quality is very poor or contains heavy background noise
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| url | string | Public URL of the file. Provide url OR base64. |
| base64 | string | File contents, base64-encoded (max 20 MB). Provide url OR base64. |
| language | string | Optional 2-letter language code, e.g. en |
Tags
x402
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