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Caption Translate Pack — Video Subtitle Generation & Translation
x402
Caption Translate Pack — Video Subtitle Generation & Translation is a paid API for AI agents from x402.agentutility.ai, paid per call via x402, $0.07/call, status unknown (last checked 2026-09-14).
Transcribes a video URL into SRT subtitles using Whisper v3, then translates those subtitles into any of 100+ target languages in a single API call.
Price / call$0.07
Success—
StatusUnknown
How this service works
Generates translated subtitles from any video URL in one call. Composite: one call runs video-to-subtitles + translate. SRT subtitles are generated via Whisper v3, then the subtitle text is translated into the target language (100+ languages, structure preserved). Returns original subtitles, translated subtitles, and per-component telemetry. Use it for localized video captions, an SRT generator plus translation, or subtitle localization.
Output
Returns a JSON object containing: the original SRT-formatted subtitles, the translated SRT-formatted subtitles (with timestamps preserved), the target language, the video URL, the output format (srt), a degraded boolean flag indicating partial failures, and a components array showing per-step latency and success status for the transcription and translation stages.
Example use cases
Localize course videos for international students
“I have a lecture video at https://university.com/lectures/intro-econ.mp4 and I need SRT subtitle files in Mandarin Chinese for my students in China — can you transcribe and translate the subtitles for me?”
Accessibility captions for social media video
“Can you generate French subtitles for this product demo video at https://cdn.mybrand.com/demo-v2.mp4? I want both the original English and the French translation so I can add them to our Instagram post.”
Subtitle localization for a streaming platform
“We're launching our documentary in Brazil and need Portuguese subtitles. The video is at https://streaming.myplatform.com/docs/nature-ep1.mp4 — please transcribe it and give me the translated SRT file in Brazilian Portuguese.”
Technical details
Endpoint
POSThttps://x402.agentutility.ai/caption-translate-packWhen to prefer
Choose this endpoint when you need both transcription and translation of a video in a single call, rather than chaining two separate services. It is ideal when you already have a public video URL and need localized SRT captions ready to embed. Prefer it over manual pipelines when cost predictability ($0.07/call) and simplicity matter. If you only need transcription without translation, a video-to-subtitles-only endpoint may be cheaper.
Side effects
- Video URL is not publicly accessible or requires authentication — returns error or degraded response
- Video is too long or large and exceeds processing limits
- Unsupported or unrecognized target language code — may fall back or error
- Audio quality too poor for Whisper transcription — may produce inaccurate subtitles
- Network timeout fetching the video URL
- Translation sub-component fails — degraded=true returned with only original subtitles
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"format": "srt",
"degraded": false,
"subtitles": "1\n00:00:00,000 --> 00:00:03,000\nHello.\n",
"video_url": "https://samplelib.com/mp4/sample-5s.mp4",
"components": [
{
"ms": 5100,
"ok": true,
"name": "video-to-subtitles"
},
{
"ms": 1400,
"ok": true,
"name": "translate"
}
],
"composed_of": [
"video-to-subtitles",
"translate"
],
"target_language": "Spanish",
"translated_subtitles": "1\n00:00:00,000 --> 00:00:03,000\nHola.\n"
}
}Tags
x402
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