# fastapi.online — Transcribe & Translate Audio

> fastapi.online — Transcribe & Translate Audio is a paid API for AI agents from api.fastapi.online, paid per call via x402, $0.006/call, status unknown (last checked 2026-09-15).

Transcribes an audio file to text and translates the transcript into a specified target language in a single call

## Facts

- Endpoint: POST https://api.fastapi.online/transcribe-translate
- Price: $0.006/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/fastapi-online-transcribe-translate-audio-d128c373
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_lnlfqMVruyC_VAvXl23p8

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 fastapi-online-transcribe-translate-audio-d128c373 -d '<json body>'
```

Example prompt: Can you transcribe this MP3 voice recording and translate the transcript into Spanish for me?

## When to prefer this

Choose this endpoint when you need both transcription and translation in a single API call with no signup required. It is ideal for pay-per-use workflows where you want to avoid subscriptions, and when you need to handle audio in one language and output text in another. Prefer it over chaining separate transcription and translation APIs for simplicity and cost efficiency at $0.006 per call.

## Known failure modes

- Unsupported audio format — only WAV, MP3, OGG and similar formats are accepted
- Missing or unrecognized target language code causes translation failure
- Audio file too large or too long may time out or be rejected
- Payment not fulfilled results in HTTP 402 response
- Poor audio quality may yield inaccurate transcription and therefore inaccurate translation
- Ambiguous language name may not resolve to the expected locale

## How this service works

Chat, embeddings, OCR, speech-to-text, image editing, image understanding (captioning/Q&amp;A), text-to-speech, translation, writing tools, classification tools, developer tools, local utilities, format/checksum validators, encoding &amp; crypto utilities, date/time calculators, geo/coordinate math, math &amp; finance calculators, novelty tools, and business/social writing generators — 179 endpoints in all, across multiple specialized self-hosted models. Pay per call with crypto — no signup — or get an API key.

## Output

A translated transcript of the audio file, where the speech has been first transcribed from the audio and then translated into the requested target language. The response likely contains the translated text as a string or JSON object.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "file": {
   "type": "string",
   "format": "binary",
   "description": "Audio file (WAV/MP3/OGG/etc)"
  },
  "target_lang": {
   "type": "string",
   "description": "Language to translate the transcript into, e.g. Spanish"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/fastapi-online-transcribe-translate-audio-d128c373/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.fastapi.online](https://www.zero.xyz/host/api.fastapi.online/llms.txt)