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free-sign

https://free-sign.com/mcp

answers a handshake

Registry name: com.free-sign/signing
Reports itself as: free-sign 0.0.0
Protocol version: 2025-06-18
Transport: streamable-http
HTTP status: 200
Latency: 204 ms
Tools: 5
Checked: 2026-09-06T02:54:03Z

Tools it reports

create_signing_envelope
verify_document_hash
get_receipt
get_ots_proof
verify_audit_chain

Check it yourself

curl -s -X POST https://free-sign.com/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"}}}'