# Caption Translate Pack — Video Subtitle Generation & Translation

> 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.

## Facts

- Endpoint: POST https://x402.agentutility.ai/caption-translate-pack
- Price: $0.07/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/caption-translate-pack-video-subtitle-generation-translation-356a7fe7
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_wbvGHSLtrxUh1Vf8UieC9

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability caption-translate-pack-video-subtitle-generation-translation-356a7fe7 -d '<json body>'
```

Example prompt: Can you generate translated SRT subtitles for this video (https://example.com/myvideo.mp4) in Spanish? I need both the original English subtitles and the Spanish translation.

## When to prefer this

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.

## Known failure modes

- 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

## 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.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method",
    "bodyType",
    "body"
   ],
   "properties": {
    "body": {
     "required": [
      "video_url",
      "target_language"
     ],
     "properties": {
      "video_url": {
       "type": "string",
       "description": "Public http(s) URL of the video. Max 2048 chars."
      },
      "target_language": {
       "type": "string",
       "description": "Target language name or ISO code (e.g. 'Spanish', 'es'). Max 60 chars."
      }
     }
    },
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "POST"
     ],
     "type": "string"
    },
    "bodyType": {
     "enum": [
      "json",
      "form-data",
      "text"
     ],
     "type": "string"
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "properties": {
      "format": {
       "type": "string"
      },
      "degraded": {
       "type": "boolean"
      },
      "subtitles": {
       "type": "string"
      },
      "video_url": {
       "type": "string"
      },
      "components": {
       "type": "array",
       "items": {
        "type": "object",
        "properties": {
         "ms": {
          "type": "integer"
         },
         "ok": {
          "type": "boolean"
         },
         "name": {
          "type": "string"
         }
        }
       }
      },
      "composed_of": {
       "type": "array",
       "items": {
        "type": "string"
       }
      },
      "target_language": {
       "type": "string"
      },
      "translated_subtitles": {
       "type": "string"
      }
     }
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "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"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/caption-translate-pack-video-subtitle-generation-translation-356a7fe7/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402.agentutility.ai](https://www.zero.xyz/host/x402.agentutility.ai/llms.txt)