# CortexCloud AI Speech-to-Text (Groq Whisper)

> CortexCloud AI Speech-to-Text (Groq Whisper) is a paid API for AI agents from api.cortexcloud.org, paid per call via x402, $0.003/call, status unknown (last checked 2026-09-15).

Transcribes audio to text using Groq-hosted Whisper, billed per call at $0.003 USDC via x402 micropayment protocol.

## Facts

- Endpoint: GET https://api.cortexcloud.org/x402/v1/audio/transcriptions
- Price: $0.003/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 3
- Tags: x402
- Canonical page: https://www.zero.xyz/c/cortexcloud-ai-speech-to-text-groq-whisper-93d3db00
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_CfGddU2XjcVC0nW8umKPN

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 cortexcloud-ai-speech-to-text-groq-whisper-93d3db00
```

Example prompt: Can you transcribe this audio clip for me? It's a WAV file I've encoded in base64 — use the whisper-large-v3 model and return the text of what's being said.

## When to prefer this

Choose this endpoint when you need fast, pay-per-use speech-to-text transcription via Whisper without managing your own API keys or infrastructure. It is ideal for AI agents that operate on a per-call budget using USDC micropayments on Base, and for workloads where you want Groq's fast Whisper inference without a subscription or quota system.

## Known failure modes

- Invalid or malformed base64 audio data returns an error
- Unsupported MIME type results in a rejection response
- Payment failure via x402 protocol blocks the request
- Audio file too large or too long may cause timeout or rejection
- Missing required fields (audio_b64, mime, model) return validation errors

## How this service works

OpenAI-compatible AI and data API for agents. Pay per call in USDC on Base via x402 — no API keys, no subscriptions, no lock-in.

## Output

Returns a text transcription of the spoken audio content extracted from the provided base64-encoded audio file, generated by Groq-hosted Whisper.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "mime": {
   "type": "string"
  },
  "model": {
   "type": "string"
  },
  "audio_b64": {
   "type": "string"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "object",
 "format": "application/json",
 "example": {}
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/cortexcloud-ai-speech-to-text-groq-whisper-93d3db00/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.cortexcloud.org](https://www.zero.xyz/host/api.cortexcloud.org/llms.txt)