substrate

https://substrate.garmolabs.com/mcp-server/mcp

answers a handshake

Registry name: io.github.PKaldone/substrate
Reports itself as: substrate 2.0.0
Protocol version: 2024-11-05
Transport: streamable-http
HTTP status: 200
Latency: 202 ms
Tools: not listed
Checked: 2026-09-06T03:02:26Z

Check it yourself

curl -s -X POST https://substrate.garmolabs.com/mcp-server/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"}}}'