# x402.dellbot.win Speech-to-Text (Whisper/Parakeet/xAI)

> x402.dellbot.win Speech-to-Text (Whisper/Parakeet/xAI) is a paid API for AI agents from x402.dellbot.win, paid per call via x402, $0.050000/call, not verified (last probed 2026-10-23); live alternatives: Speech to Text Transcription ($0.01) and medien.halowerk.com Speech-to-Text ($0.02).

Agents call it through Zero, which pays per call: no API key and no wallet of your own. New accounts start with $5.

Live alternatives for the same use case:
- [Speech to Text Transcription](https://www.zero.xyz/c/speech-to-text-transcription-whisper-24094a07) ($0.01)
- [medien.halowerk.com Speech-to-Text](https://www.zero.xyz/c/medien-halowerk-com-speech-to-text-stt-22257e66) ($0.02)

Transcribes audio files (WAV/FLAC/M4A/MP3/OGG/WEBM) to text using Whisper Large v3, NVIDIA Parakeet, fal Wizper, or xAI STT, returning JSON with text, duration, and optional timestamps

## Facts

- Endpoint: POST https://x402.dellbot.win/transcribe?utm_source=zero.xyz
- Price: $0.050000/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-23
- Last successful call: 2026-07-24
- Success rate: 90% of calls made through Zero
- Rating: 2.7 / 5 from 2 reviews
- Activations on Zero: 29
- Tags: x402
- Canonical page: https://www.zero.xyz/c/x402-dellbot-win-0e0cce50
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_6CIY6CfbfhwKon7oD5E7S

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 x402-dellbot-win-0e0cce50 -d '<json body>'
```

Example prompt: Transcribe this meeting recording (meeting.mp3, about 4 minutes long) to text using Whisper Large v3 and include word-level timestamps so I know when each part was said.

## When to prefer this

Choose this endpoint when you need affordable, multi-model speech-to-text transcription via a pay-per-call x402 micropayment model ($0.05 USDC). Ideal for agents needing Whisper Large v3 quality or NVIDIA Parakeet/xAI STT alternatives without a subscription, for audio files under 5 minutes. Prefer over managed STT APIs when minimizing cost per call or when operating in an x402-enabled payment flow.

## Known failure modes

- Audio duration exceeds 300 seconds → HTTP 400 error; check duration before sending
- Unsupported audio format → error response; only WAV/FLAC/M4A/MP3/OGG/WEBM accepted
- Invalid model name specified → fallback or error
- Payment not included or insufficient → x402 payment required error
- File too large or corrupted → upload or processing error
- Language hint not recognized → may fall back to auto-detection

## Output

A JSON object containing: `text` (the full transcription string), `duration` (length of audio in seconds), and optionally `timestamps` (word- or segment-level timing data if requested). Returns HTTP 400 if audio exceeds 300 seconds.

## 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": {
     "type": "object",
     "required": [
      "file"
     ],
     "properties": {
      "file": {
       "type": "string",
       "format": "binary",
       "description": "Audio file (WAV/FLAC/M4A/MP3/OGG/WEBM), max 300s duration, <25MB"
      },
      "model": {
       "enum": [
        "fal-ai/wizper",
        "nvidia/parakeet-tdt-0.6b-v3",
        "openai/whisper-large-v3",
        "stt-xai-v1"
       ],
       "type": "string"
      },
      "language": {
       "type": "string",
       "description": "ISO 639-1 hint (e.g. en); optional"
      },
      "timestamps": {
       "type": "boolean",
       "default": false
      },
      "response_format": {
       "enum": [
        "json",
        "text"
       ],
       "type": "string",
       "default": "json"
      }
     }
    },
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "POST",
      "PUT",
      "PATCH"
     ],
     "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": {
      "text": {
       "type": "string"
      },
      "duration": {
       "type": "number"
      },
      "timestamps": {
       "type": "object"
      }
     }
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/x402-dellbot-win-0e0cce50/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402.dellbot.win](https://www.zero.xyz/host/x402.dellbot.win/llms.txt)