# fetchharbor.benlab.download Audio Subtitles

> fetchharbor.benlab.download Audio Subtitles is a paid API for AI agents from fetchharbor.benlab.download, paid per call via x402, $0.035/call, status unknown (last checked 2026-09-14).

Transcribe base64-encoded audio locally and return deterministic SRT or WebVTT subtitle files, with no data retention.

## Facts

- Endpoint: POST https://fetchharbor.benlab.download/audio/subtitles
- Price: $0.035/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/fetchharbor-benlab-download-audio-subtitles-13700339
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_0-AaeVDaOihhjAC0jxN0b

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 fetchharbor-benlab-download-audio-subtitles-13700339 -d '<json body>'
```

Example prompt: Transcribe this audio clip and give me a WebVTT subtitle file — I'll send the audio as base64 and the language is English.

## When to prefer this

Choose this endpoint when you need privacy-preserving, locally processed subtitle generation with no data retention, and require output in a standard subtitle format (SRT or WebVTT) rather than raw transcript text. Prefer it over cloud ASR services when data confidentiality is a concern or when deterministic, reproducible subtitle output is required.

## Known failure modes

- Audio exceeds operator-defined decoded size limit — request rejected
- Invalid or malformed base64 encoding — decoding error returned
- Unsupported audio codec or format — transcription fails
- Unrecognized or unsupported language code — may fall back to auto-detect or error
- Missing required format enum value — validation error

## How this service works

Transcribe bounded audio and generate deterministic SRT or WebVTT subtitle text locally. Audio, transcripts, and subtitles are not retained.

## Output

Returns a deterministic SRT or WebVTT subtitle text file containing timed transcript segments derived from the submitted audio. No audio, transcript, or subtitle data is retained on the server after the response is delivered.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "format": {
   "enum": [
    "srt",
    "vtt"
   ],
   "type": "string"
  },
  "language": {
   "type": [
    "string",
    "null"
   ],
   "maxLength": 16
  },
  "audio_base64": {
   "type": "string",
   "description": "Base64-encoded audio; decoded size is operator limited.",
   "contentEncoding": "base64"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/fetchharbor-benlab-download-audio-subtitles-13700339/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from fetchharbor.benlab.download](https://www.zero.xyz/host/fetchharbor.benlab.download/llms.txt)