Kotoba Speech-to-Text

Turns speech into text

Liveby Kotoba Technologies

Accurate transcription of an audio clip in one request, with word timestamps, tuned for Japanese and East Asian languages.

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How it works

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Pay only when it worksEach use comes out of your balance. If it fails, you aren't charged.

For developersSummary, tool id, API call and input schema

Speech to text API by Kotoba Technologies, callable through Superpowers. It costs $0.270 per request, charged only when the call succeeds. Call it with one API key: POST /v1/run with "tool": "fal.kotoba-technologies-kotoba-stt-v1-speech-to-text", or over MCP with run_tool. 4 other providers in this category take the same input and can be compared side by side.

Tool id
Price per call: $0.270 / request

Call it

Also over MCP as run_tool

curl -X POST https://superpowers.tools/v1/run \
  -H 'Authorization: Bearer $SP_KEY' \
  -d '{"tool":"fal.kotoba-technologies-kotoba-stt-v1-speech-to-text","input":{"audio_url":"","language":""},"idempotency_key":"example-request-1"}'

Input

4 fields · 2 required

{
  "type": "object",
  "required": [
    "audio_url",
    "language"
  ],
  "properties": {
    "diarization": {
      "type": "boolean",
      "description": "Attribute words to speakers (`speaker_id` on each word; models with speaker tokens only). Word times are null unless `with_timestamps` is also set.",
      "default": false
    },
    "audio_url": {
      "type": "string",
      "description": "Speech to transcribe: an https:// URL on fal's CDN (Playground uploads and microphone recordings) or a base64 data: URI. Up to 2 minutes."
    },
    "language": {
      "type": "string",
      "description": "Language spoken in the audio.",
      "enum": [
        "ja",
        "en",
        "ko",
        "zh",
        "es",
        "zh-hk",
        "zh-tw"
      ]
    },
    "with_timestamps": {
      "type": "boolean",
      "description": "Return `words` with start and end times for each word.",
      "default": false
    }
  }
}