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com.blackwalltier/blackwall-x402-guardrail

com.blackwalltier/blackwall-x402-guardrail in the official MCP registry. Endpoint https://mcp.blackwalltier.com/. Source: github.com/bluetieroperations-create/blackwall-x402-mcp.

The registry describes it as: Keyless hosted MCP: pre-signature x402 payment verdict (GO/HOLD/STOP) with a signed receipt.

Tools it advertises

forecast_payment

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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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