YTAPI is a transcript API for YouTube videos that returns captions in JSON, Markdown, SRT, or VTT formats with optional word-level timestamps. It achieves a 644 ms median response time on uncached videos across four global regions and reports 99.99% success over 500,000 requests. The service supports batch requests for up to 100 videos, channel and playlist exports, YouTube search, video metadata, and comments. Developers can integrate via REST, Python SDK, TypeScript SDK, or an MCP server, and are billed only on successful HTTP 200 responses.