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fastapi.online Audio Duration
x402
fastapi.online Audio Duration is a paid API for AI agents from api.fastapi.online, paid per call via x402, $0.0005/call, status down (last checked 2026-09-15).
Returns the duration of a WAV audio file in seconds
Price / call$0.0005
Success—
StatusDown
How this service works
Chat, embeddings, OCR, speech-to-text, image editing, image understanding (captioning/Q&A), text-to-speech, translation, writing tools, classification tools, developer tools, local utilities, format/checksum validators, encoding & crypto utilities, date/time calculators, geo/coordinate math, math & finance calculators, novelty tools, and business/social writing generators — 179 endpoints in all, across multiple specialized self-hosted models. Pay per call with crypto — no signup — or get an API key.
Output
Returns the duration of the provided WAV audio file, expressed as a numeric value in seconds, allowing the caller to know the exact playback length of the audio without having to play or locally analyze the file.
Example use cases
Validate recording length before upload
“Before I upload this WAV recording to my podcast platform, can you check how many seconds long it is so I know it meets the minimum length requirement?”
Batch audio metadata extraction
“I have a WAV file from my call center recording system — can you measure its duration in seconds so I can log it to my database?”
Check interview clip length
“I recorded an interview as a WAV file and need to know exactly how long it is in seconds before I split it into segments — can you get the duration for me?”
Technical details
Endpoint
POSThttps://api.fastapi.online/audio-durationWhen to prefer
Use this endpoint when you need a quick, pay-per-call, no-signup way to retrieve the duration of a WAV audio file without setting up local audio processing libraries. Ideal for agents that occasionally need audio metadata on demand without managing infrastructure.
Side effects
- Non-WAV file format submitted — may return an error or incorrect result
- Corrupted or malformed WAV file — likely returns an error
- Empty or zero-byte file uploaded — likely returns an error or zero duration
- File too large for single request — may time out or be rejected
- Payment not included or insufficient — returns HTTP 402
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| file | string | WAV audio file |
Tags
x402
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