"Handshake" matching MCP connectors:

Real MCP handshake witness graded per-client, signed expiring receipt.

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Arclan MCP RegistryA

ai.arclan

MCP registry: 138k servers crawled, handshake-validated, reliability-scored. 744 production-safe.

{"jsonrpc":"2.0","id":1,"method":"tools/call","params":{"name":"whoami","arguments":{}}} free no key

Find MCP servers and check whether they actually respond, via live handshake probes.