Getplexa MCP server

@getplexa/mcp — Plexa MCP server

A Model Context Protocol server that gives any MCP client (Claude Desktop, Cursor, your own agent) two economic-safety tools from Plexa — the x402-native economic-safety layer for trading agents — paid per call in USDC, no accounts:

It is a thin client of the public API (https://api.getplexa.com) — it pays a 402 automatically, signs the USDC authorization locally with your wallet, and never sees your key. The liquidity engine stays behind the API.

Why

A generic wallet guard answers "can I sign this transaction?". It can't answer the economic question an automated trader actually needs: what price will this swap really fill at under my size, and is this token a trap (rug / honeypot / thin liquidity)? Plexa answers both. This package puts those answers one tool-call away inside any MCP-speaking agent.

Install

Nothing to install — point your MCP client at the package via npx. It is fetched and run on demand.

Claude Desktop

Add to claudedesktopconfig.json (Settings → Developer → Edit Config):

{
  "mcpServers": {
    "plexa": {
      "command": "npx",
      "args": ["-y", "@getplexa/mcp"],
      "env": {
        "PLEXA_BASE_URL": "https://api.getplexa.com",
        "AGENT_WALLET_KEY": "0x<your funded wallet private key>",
        "CHAIN": "base"
      }
    }
  }
}

Cursor

Add to ~/.cursor/mcp.json (or Settings → MCP → Add) — the same mcpServers block as above.

Restart the client. You should see the plexaquote and plexapretrade_check tools available.

Configuration

All configuration is via environment variables (set in the env block of your MCP config):

Funding. Use a dedicated, low-balance wallet with a little USDC on CHAIN to pay per call (quotes $0.02, checks $0.05). The wallet signs an EIP-3009 USDC authorization per request; Plexa returns the result only after the payment settles on-chain (settle-before-serve).

Shortened. The full README is on GitHub.