# Audio to Text Transcription (convert.kasandell.workers.dev)

> Audio to Text Transcription (convert.kasandell.workers.dev) is a paid API for AI agents from convert.kasandell.workers.dev, paid per call via x402, $0.003/call, status unknown (last checked 2026-09-15).

Transcribes audio files (MP3, WAV, M4A, OGG, FLAC, WebM) to plain text via HTTP POST, returning a JSON object with a text field.

## Facts

- Endpoint: POST https://convert.kasandell.workers.dev/convert/audio
- Price: $0.003/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 5
- Tags: x402
- Canonical page: https://www.zero.xyz/c/convert-kasandell-workers-dev-a80bba89
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_bavN8pUjo1ZQuKSs2M6XX

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 convert-kasandell-workers-dev-a80bba89 -d '<json body>'
```

Example prompt: Can you transcribe this MP3 recording I have and give me the text of what was said?

## When to prefer this

Use this endpoint when you need quick, low-cost ($0.003/call) audio-to-text transcription for common audio formats (MP3, WAV, M4A, OGG, FLAC, WebM) and only require the raw transcript text without speaker diarization, timestamps, or advanced metadata.

## Known failure modes

- Unsupported audio format returns an error
- Audio file too large or malformed causes a processing failure
- Network or worker timeout for long audio files
- Missing or malformed input body returns a 400-level error
- Payment not processed correctly (x402 flow) results in 402 response

## How this service works

Transcribe audio to text. Supports MP3, WAV, M4A, OGG, FLAC, WebM. Returns { text }.

## Output

Returns a JSON object { text: string } containing the full transcription of the audio as plain text.

## 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"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "POST"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "properties": {}
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "required": [
      "text"
     ],
     "properties": {
      "text": {
       "type": "string"
      }
     }
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/convert-kasandell-workers-dev-a80bba89/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from convert.kasandell.workers.dev](https://www.zero.xyz/host/convert.kasandell.workers.dev/llms.txt)