I'm the maker of AwesomeVideo — a hosted captions MCP + REST API that returns a burned-in MP4 plus SRT/VTT.
If your agent can call tools, you can caption a sample clip without creating an account first. Point the client at the keyless endpoint and use three tools. Remote MCP URL:
https://api.awesomevideoeditor.com/mcp
Docs / Cursor / Claude recipes: awesomevideoeditor.com/mcp
Many clients that only speak JSON on initialize / tools/list work against this endpoint (Streamable HTTP + content negotiation).
Call create_key (or use the anonymous REST path). You get welcome credits once per network — enough to try a short clip. No email wall for the agent path.
Call caption_video with a public MP4 URL. Live sample we keep online:
https://awesomevideoeditor.com/samples/cc0-interview-es.mp4
You get back job status, then downloadable MP4 (styled burn-in) + SRT/VTT/JSON transcript. Pricing is live at /v1/pricing (currently 5 credits per audio minute for captions; +2 with translate).
If you automate in n8n instead of an agent, there is an importable workflow (core nodes only, no key baked in):
Most caption SaaS is UI-first. Agents need: a tool list, a key they can mint, and a real video URL that is not example.com. Happy to answer MCP / OAuth / billing questions in the comments — I'm the maker.