# Microsoft AI Audio Transcriptions via OpenRouter

> Microsoft AI Audio Transcriptions via OpenRouter is a paid API for AI agents from Microsoft AI at microsoft-ai.mpp.tempo.xyz, paid per call via MPP, price unknown, status unknown (last checked 2026-10-29).

Transcribes base64-encoded PCM WAV audio (mono, 16-bit, 16 kHz, up to 10 minutes) into text using Microsoft AI speech models

## Facts

- Endpoint: POST https://microsoft-ai.mpp.tempo.xyz/v1/audio/transcriptions?utm_source=zero.xyz
- Price: price unknown
- Payment: MPP
- Status: unknown
- Last checked: 2026-10-29
- Activations on Zero: 0
- Provider: Microsoft AI
- Docs: https://openrouter.ai
- Website: https://openrouter.ai
- Tags: ai
- Canonical page: https://www.zero.xyz/c/microsoft-ai-audio-transcriptions-via-openrouter-6289c0dd
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_ATNWrZQ5cr3G80R_P1eld

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 microsoft-ai-audio-transcriptions-via-openrouter-6289c0dd -d '<json body>'
```

Example prompt: Can you transcribe this audio recording for me? I have a mono 16-bit 16 kHz WAV file encoded in base64 — it's about 3 minutes long and I need the spoken content converted to text using Microsoft's speech model.

## When to prefer this

Choose this endpoint when you need to transcribe short-to-medium duration audio (up to 10 minutes) in mono PCM WAV format via Microsoft AI's speech models, especially when operating in a crypto-native or agent payment context using USDC on-chain micropayments via the MPP/x402 protocol. Prefer this over generic STT APIs when you need Microsoft's specific model quality or when integrating into a Coinbase-curated agent ecosystem.

## Known failure modes

- Audio exceeds 10-minute duration limit — request rejected
- Invalid base64 encoding causes decoding failure
- Audio format mismatch (not mono, not 16-bit, or not 16 kHz) leads to poor results or error
- Unsupported model identifier specified
- Payment failure or insufficient USDC balance prevents call
- Network timeout on large audio payloads

## How this service works

Transcribe base64 PCM WAV (mono, 16-bit, 16 kHz, up to 10 minutes; models and prices at GET /v1/audio/models)

## Output

A text transcript of the spoken content from the provided audio, extracted from the base64-encoded PCM WAV input using the selected Microsoft AI speech model.

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/microsoft-ai-audio-transcriptions-via-openrouter-6289c0dd/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from microsoft-ai.mpp.tempo.xyz](https://www.zero.xyz/host/microsoft-ai.mpp.tempo.xyz/llms.txt)