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AiAgentKarl

x402 Payment Gateway MCP Server

by AiAgentKarl
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Python
Remote

x402 Payment Gateway MCP Server 💰

MCP Server that enables micropayments between AI agents using USDC on Solana. Based on the x402 protocol (HTTP 402 Payment Required).

What is x402?

x402 is a protocol that lets AI agents pay for services automatically. When an agent calls a premium tool, it gets a "402 Payment Required" response with payment instructions. The agent pays via blockchain, then gets access.

Related MCP server: x402 MCP Payment

Features

  • Payment Requests — Create x402-compatible payment requests for any tool

  • On-Chain Verification — Verify USDC payments directly on Solana

  • Tool Pricing — Set per-call prices for individual tools

  • Revenue Tracking — Dashboard with total revenue, per-tool breakdown

  • Payment History — Full audit trail of all transactions

Installation

pip install x402-mcp-server

Configuration

Set your merchant wallet in .env:

MERCHANT_WALLET=YourSolanaWalletAddress
SOLANA_RPC_URL=https://api.mainnet-beta.solana.com

Usage with Claude Code

{
  "mcpServers": {
    "x402": {
      "command": "uvx",
      "args": ["x402-mcp-server"],
      "env": {
        "MERCHANT_WALLET": "YourSolanaWalletAddress"
      }
    }
  }
}

Tools

Tool

Description

create_payment_request

Create a 402 payment request for a tool

verify_payment

Verify on-chain USDC payment

get_payment_status

Check payment status

set_tool_price

Set price for a tool

get_price_list

View all tool prices

list_payments

Payment history

get_revenue

Revenue statistics

Flow

Agent A                    x402 Gateway                 Agent B (Service)
   |                           |                             |
   |-- "Use premium tool" ---->|                             |
   |                           |-- 402 Payment Required ---->|
   |<-- Payment instructions --|                             |
   |                           |                             |
   |-- USDC payment on-chain ->|                             |
   |                           |-- verify_payment ---------->|
   |                           |<-- verified ----------------|
   |<-- Access granted --------|                             |

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License

MIT

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Related MCP Connectors

  • x402-mcp

    Pay for HTTP APIs and charge for your own: x402 micropayments in USDC on Base.

  • Vibe Springs

    Pay-per-use weather, environment, finance, and on-chain intelligence tools for AI agents via x402.

  • spraay-solana-gateway

    Batch send SOL or any SPL token to 1000+ wallets via x402. AI agent payments on Solana.

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