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CrossingKey MCP
com.crossingkeyintelligence/crossingkey-mcp in the official MCP registry.
Endpoint https://mcp.crossingkeyintelligence.com/mcp. Source: github.com/crossingkey-holdings/crossingkey-mcp.
The registry describes it as: Agent-native MCP for governed commerce, x402 payments, paid capabilities, and verifiable receipts.
We read its 28 tools on 2026-10-27. Nothing in them matched our tool-poisoning rules. It also sets server instructions, text a client puts in front of the model on connect; those were read too.
A clean read means these rules found nothing, not that the server is harmless. A server can change its tools at any time, which is why the index reads it again every week.
Tools it advertises
marketplace.describe provider.apply provider.get capability.get capability.search catalog.list commerce.quote creator.apply provider.describe offers.list requirements.check cost.estimate result.preview execution.preflight credits.options x402.compatibility_audit mcp.schema_audit openapi.quality_audit machine_commerce.readiness_audit artifact.integrity_manifest hash.encode secret.scan pii.scan json.repair prompt.audit mcp.launch_audit x402.purchase_path_audit xkey.validate
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The badge reflects the latest weekly read: 
[](https://lazaretto.dev/mcp-registry/com-crossingkeyintelligence-crossingkey-mcp)How this was checked
Lazaretto connects to the endpoint the way any MCP client does, asks the server to introduce itself and list its tools, and reads every name, description, parameter schema and server instruction for tool poisoning: hidden directive blocks, orders to read local secrets, parameters built to carry secrets or the conversation out, orders that redirect another server's tools, and invisible characters. It never calls a tool. What we found across the registry.
To run the same check every time Claude Code adds a server, install the free lazaretto-guard plugin. Browse every server in the index.
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