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mcp/harbor
Verified official

blackwall x402 guardrail MCP

v0.1.2

com.blackwalltier/blackwall-x402-guardrail

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

transport:streamable-http
View source Website

Target client

run in your project directory 

claude mcp add --transport http blackwall-x402-guardrail https://mcp.blackwalltier.com

Adds it for this project only. Append --scope user to make it available everywhere. Claude Code docs

This listing does not declare its tools. Connect the server and your client will discover them on the handshake.