mfgcalcs

https://www.mfgcalcs.com/api/mcp

answers a handshake

Registry name: com.mfgcalcs/mfgcalcs
Reports itself as: mfgcalcs 1.0.0
Protocol version: 2025-03-26
Transport: streamable-http
HTTP status: 200
Latency: 256 ms
Tools: not listed
Checked: 2026-09-06T07:53:20Z

Check it yourself

curl -s -X POST https://www.mfgcalcs.com/api/mcp \
  -H 'Content-Type: application/json' \
  -H 'Accept: application/json, text/event-stream' \
  -d '{"jsonrpc":"2.0","id":1,"method":"initialize","params":{"protocolVersion":"2025-06-18","capabilities":{},"clientInfo":{"name":"you","version":"0"}}}'