# Caption402

> Captions and subtitles for AI agents: send a direct link to a video or audio file, get timed SRT and WebVTT subtitles in the spoken language plus translations, with the transcript. $0.05/minute in USDC via x402 v2. No account.

## Captions
- GET https://caption402.com/api/captions?url=https://example.com/video.mp4&translate=fr-CA,es
- POST https://caption402.com/api/captions {"url":"https://example.com/video.mp4","translate":["fr-CA","es"]}
- Returns: language (detected), duration_s, captions.{lang}.srt and .vtt (inline text) plus srt_url / vtt_url download links (kept 24 h), text (full transcript), cues. include_words=1 adds word timestamps.
- Optional: language=xx (spoken language, otherwise detected), vocabulary="names, product terms" (spelling hints).
- Price: $0.05 per started minute for the spoken language, +$0.02 per minute per translation, $0.10 minimum, up to 30 minutes and 5 translations. Quoted exactly from the duration before payment; charged only if captions are delivered. Typical processing: 10-90 seconds.
- Default x402 clients cap one payment at $1: that covers 20 minutes without translation, or 14 minutes with one translation.

## Free
- Test clip: https://caption402.com/sample.mp3 (18 s of English speech; a paid call on it costs the $0.10 minimum)
- GET https://caption402.com/api/captions/quote?url=...&translate=... -> duration and exact price
- GET https://caption402.com/api/sample/captions -> sample result
- GET https://caption402.com/api/languages

## Rules
Direct media file links only (mp4, mov, webm, mkv, mp3, m4a, wav, ogg...). YouTube, TikTok, Netflix, social and streaming platforms are refused. Only submit media you own or have the right to caption. Private and local network addresses are blocked.
Abuse ends access for the paying wallet. Terms: https://caption402.com/terms · Abuse: abuse@caption402.com
Agent skill: https://caption402.com/skill.md

## Related
- Geo402 (https://geo402.com): fetch any public web page from a residential IP in 190+ countries, paid per page via x402.
- ASIN402 (https://asin402.com): structured Amazon prices, price history and analysis across 11 marketplaces, paid via x402.