Transcribe audio/video to LRC, SRT, WebVTT, ASS, TTML and create karaoke videos

Transcribe audio or video files to time-synced lyrics or subtitle formats like LRC, SRT, WebVTT, ASS, and TTML, and create karaoke videos.

Karadeo — Agent & AI Integration Guide

Karadeo is a karaoke and lyrics tooling platform. This document describes all available APIs, tools, and agent integration surfaces.

Authentication

All API endpoints require a Bearer API key from https://karadeo.com/dashboard.

Authorization: Bearer kd_<your-api-key>

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MCP Server

Karadeo exposes a full MCP (Model Context Protocol) server for AI agent tool use.

Endpoint: POST https://karadeo.com/api/mcp
Transport: Streamable HTTP (JSON-RPC 2.0)
Discovery: https://karadeo.com/.well-known/mcp/server-card.json

Initialize

{"jsonrpc":"2.0","id":1,"method":"initialize","params":{}}

List Tools

{"jsonrpc":"2.0","id":2,"method":"tools/list","params":{}}

Call Tool

{
  "jsonrpc": "2.0",
  "id": 3,
  "method": "tools/call",
  "params": {
    "name": "transcribe",
    "arguments": {
      "audio_url": "https://example.com/song.mp3",
      "format": "lrc"
    }
  }
}

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REST API

Transcribe

Convert audio or video to time-synced lyrics or subtitle files.

Endpoint: POST https://karadeo.com/api/transcribe
Docs: https://karadeo.com/resources/karadeo-lyrics-api
OpenAPI: https://karadeo.com/api/doc

Request body (JSON):

Field	Type	Required	Description
fileUrl	string	yes	Publicly accessible audio/video URL
format	string	no	lrc, srt, ass, webvtt, ttml, txt (default: lrc)
transcriptText	string	no	Known lyrics to align instead of auto-transcribing
isWordLevel	boolean	no	Word-level timing (default: false)

Example:

curl -X POST https://karadeo.com/api/transcribe \
  -H "Authorization: Bearer kd_your_key" \
  -H "Content-Type: application/json" \
  -d '{"fileUrl":"https://example.com/song.mp3","format":"lrc"}'

Response: Plain text subtitle file with appropriate Content-Type header.

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WebMCP (Browser)

Karadeo registers browser tools via navigator.modelContext.registerTool() on every page load.

Available tools:

• list-karaoke-tools — list all Karadeo tools with URLs
• navigate-to-tool — navigate to a specific tool page
• list-karaoke-templates — list available karaoke video templates

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Discovery Endpoints

Endpoint	Description
/.well-known/agent-skills/index.json	Agent Skills Discovery index (RFC v0.2.0)
/.well-known/mcp/server-card.json	MCP Server Card (SEP-1649)
/.well-known/api-catalog	API Catalog (RFC 9727)
/.well-known/oauth-authorization-server	OAuth discovery metadata (RFC 8414)

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Content Policy

Content-Signal: ai-train=no, search=yes, ai-input=no

AI agents may read this site for tool use. Training on site content is not permitted.