How do I install x402 Wallet?

Pick a client above and copy the generated config. Cursor and VS Code also have a deep link when the server can run locally or remotely.

Is x402 Wallet official?

No. Registry-listed is not the same as vendor-official. Read the methodology for the difference.

How is the trust score calculated?

This listing scores 55 (Fair). The formula is published on the methodology page.

MCPpedia

x402 Wallet MCP Server | MCPpedia

x402 Wallet MCP Server

Name: x402 Wallet MCP Server
Author: nirholas

Self-custodial x402 wallet for AI agents: pay any service in USDC or $THREE from your own key.

Tools Versions Alternatives

Registrynirholas

55Fair

Install

~/Library/Application Support/Claude/claude_desktop_config.json

{
  "mcpServers": {
    "nirholas-x402-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "@three-ws/x402-mcp@0.2.3"
      ],
      "env": {
        "SOLANA_SECRET_KEY": "YOUR_SOLANA_SECRET_KEY",
        "SOLANA_RPC_URL": "https://api.mainnet-beta.solana.com",
        "MAX_PAY_USD": "1",
        "REQUIRE_CONFIRM": "true",
        "THREE_WS_BASE": "https://three.ws"
      }
    }
  }
}

Install guide

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Environment

Name	Required	Notes
SOLANA_SECRET_KEY	No	Base58 (or JSON byte-array) Solana secret key that signs payments and holds the USDC. Not needed for the read tools (find_services, inspect_endpoint, or x402_wallet with an explicit address). Treat like cash. Secret.
SOLANA_RPC_URL	No	Solana mainnet RPC endpoint. Defaults to the public cluster — bring your own (Helius / Quicknode / Triton) for production traffic.
MAX_PAY_USD	No	Max USD a single pay_and_call may spend. Bounds a runaway or injected payment.
REQUIRE_CONFIRM	No	When on (default), pay_and_call refuses until re-issued with confirm:true. Set 0/false to disable the gate.
THREE_WS_BASE	No	Base URL of the three.ws API that serves /api/bazaar/search for find_services. Override only when self-hosting.

x402 Wallet MCP Server

Install

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