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x402-mcp-server
x402 Payment Gateway for AI Agents β enable micropayments between agents using USDC on Solana
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x402 Payment Gateway MCP Server π°
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.
Features
- Payment Requests β Create x402-compatible payment requests for any tool
- On-Chain Verification β Verify USDC payments directly on Solana
- Tool Pricing β Set per-call prices for individual tools
- Revenue Tracking β Dashboard with total revenue, per-tool breakdown
- Payment History β 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
