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mcp/harbor
Verified official

Base Tx Preflight MCP

v1.0.0

com.madebydevx.preflight/preflight

Simulate a Base tx before signing: revert reason, gas limit, full fee in ETH/USD. Paid x402.

transport:streamable-http tools:2
Website

Target client

run in your project directory 

claude mcp add --transport http preflight https://preflight.madebydevx.com/mcp

setup guides: Claude Code Claude Desktop Cursor VS Code Zed Windsurf Cline Gemini CLI Grok ChatGPT Claude.ai LangChain

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

preflight_quote

preflight quote

preflight_validate

preflight validate

All 2 tools, one page each

Mutating and Read-only are read off each tool's name, not its schema — a hint, not a guarantee. Check the server's own documentation before granting access.