Pay Mcp

tech.vauban/pay-mcp · v0.19.0

x402 pay tools for MCP clients, plus a `buy` command: read the offer, consent, pay. Starknet, Base.

Set it up

Connect Runs on your machine

Terminal

claude mcp add pay-mcp -e STARKNET_RPC_URL=<STARKNET_RPC_URL> -e PAY_MCP_SEPOLIA_ACCOUNT_ADDRESS=<PAY_MCP_SEPOLIA_ACCOUNT_ADDRESS> -e PAY_MCP_SEPOLIA_PRIVATE_KEY=<PAY_MCP_SEPOLIA_PRIVATE_KEY> -e PAY_MCP_STANDARD_X402_PAYEES=<PAY_MCP_STANDARD_X402_PAYEES> -e PAY_MCP_STANDARD_X402_MAX_WEI=<PAY_MCP_STANDARD_X402_MAX_WEI> -e PAY_MCP_STANDARD_X402_ACCOUNT_ADDRESS=<PAY_MCP_STANDARD_X402_ACCOUNT_ADDRESS> -e PAY_MCP_STANDARD_X402_PRIVATE_KEY=<PAY_MCP_STANDARD_X402_PRIVATE_KEY> -e PAY_MCP_EVM_KEYSTORE_PATH=<PAY_MCP_EVM_KEYSTORE_PATH> -e PAY_MCP_EVM_PASSWORD_PATH=<PAY_MCP_EVM_PASSWORD_PATH> -e PAY_MCP_EVM_NETWORKS=<PAY_MCP_EVM_NETWORKS> -e PAY_MCP_EVM_PAYEES=<PAY_MCP_EVM_PAYEES> -e PAY_MCP_EVM_MAX_PER_PAYMENT=<PAY_MCP_EVM_MAX_PER_PAYMENT> -e PAY_MCP_EVM_MAX_PER_SESSION=<PAY_MCP_EVM_MAX_PER_SESSION> -e PAY_MCP_EVM_I_ACCEPT_MAINNET_SPEND=<PAY_MCP_EVM_I_ACCEPT_MAINNET_SPEND> -e PAY_MCP_EVM_ASSETS=<PAY_MCP_EVM_ASSETS> -- npx -y @vauban-pay/[email protected]

claude_desktop_config.json

{
  "mcpServers": {
    "pay-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "@vauban-pay/[email protected]"
      ],
      "env": {
        "STARKNET_RPC_URL": "<STARKNET_RPC_URL>",
        "PAY_MCP_SEPOLIA_ACCOUNT_ADDRESS": "<PAY_MCP_SEPOLIA_ACCOUNT_ADDRESS>",
        "PAY_MCP_SEPOLIA_PRIVATE_KEY": "<PAY_MCP_SEPOLIA_PRIVATE_KEY>",
        "PAY_MCP_STANDARD_X402_PAYEES": "<PAY_MCP_STANDARD_X402_PAYEES>",
        "PAY_MCP_STANDARD_X402_MAX_WEI": "<PAY_MCP_STANDARD_X402_MAX_WEI>",
        "PAY_MCP_STANDARD_X402_ACCOUNT_ADDRESS": "<PAY_MCP_STANDARD_X402_ACCOUNT_ADDRESS>",
        "PAY_MCP_STANDARD_X402_PRIVATE_KEY": "<PAY_MCP_STANDARD_X402_PRIVATE_KEY>",
        "PAY_MCP_EVM_KEYSTORE_PATH": "<PAY_MCP_EVM_KEYSTORE_PATH>",
        "PAY_MCP_EVM_PASSWORD_PATH": "<PAY_MCP_EVM_PASSWORD_PATH>",
        "PAY_MCP_EVM_NETWORKS": "<PAY_MCP_EVM_NETWORKS>",
        "PAY_MCP_EVM_PAYEES": "<PAY_MCP_EVM_PAYEES>",
        "PAY_MCP_EVM_MAX_PER_PAYMENT": "<PAY_MCP_EVM_MAX_PER_PAYMENT>",
        "PAY_MCP_EVM_MAX_PER_SESSION": "<PAY_MCP_EVM_MAX_PER_SESSION>",
        "PAY_MCP_EVM_I_ACCEPT_MAINNET_SPEND": "<PAY_MCP_EVM_I_ACCEPT_MAINNET_SPEND>",
        "PAY_MCP_EVM_ASSETS": "<PAY_MCP_EVM_ASSETS>"
      }
    }
  }
}

~/.cursor/mcp.json

{
  "mcpServers": {
    "pay-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "@vauban-pay/[email protected]"
      ],
      "env": {
        "STARKNET_RPC_URL": "<STARKNET_RPC_URL>",
        "PAY_MCP_SEPOLIA_ACCOUNT_ADDRESS": "<PAY_MCP_SEPOLIA_ACCOUNT_ADDRESS>",
        "PAY_MCP_SEPOLIA_PRIVATE_KEY": "<PAY_MCP_SEPOLIA_PRIVATE_KEY>",
        "PAY_MCP_STANDARD_X402_PAYEES": "<PAY_MCP_STANDARD_X402_PAYEES>",
        "PAY_MCP_STANDARD_X402_MAX_WEI": "<PAY_MCP_STANDARD_X402_MAX_WEI>",
        "PAY_MCP_STANDARD_X402_ACCOUNT_ADDRESS": "<PAY_MCP_STANDARD_X402_ACCOUNT_ADDRESS>",
        "PAY_MCP_STANDARD_X402_PRIVATE_KEY": "<PAY_MCP_STANDARD_X402_PRIVATE_KEY>",
        "PAY_MCP_EVM_KEYSTORE_PATH": "<PAY_MCP_EVM_KEYSTORE_PATH>",
        "PAY_MCP_EVM_PASSWORD_PATH": "<PAY_MCP_EVM_PASSWORD_PATH>",
        "PAY_MCP_EVM_NETWORKS": "<PAY_MCP_EVM_NETWORKS>",
        "PAY_MCP_EVM_PAYEES": "<PAY_MCP_EVM_PAYEES>",
        "PAY_MCP_EVM_MAX_PER_PAYMENT": "<PAY_MCP_EVM_MAX_PER_PAYMENT>",
        "PAY_MCP_EVM_MAX_PER_SESSION": "<PAY_MCP_EVM_MAX_PER_SESSION>",
        "PAY_MCP_EVM_I_ACCEPT_MAINNET_SPEND": "<PAY_MCP_EVM_I_ACCEPT_MAINNET_SPEND>",
        "PAY_MCP_EVM_ASSETS": "<PAY_MCP_EVM_ASSETS>"
      }
    }
  }
}

.vscode/mcp.json

{
  "servers": {
    "pay-mcp": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "@vauban-pay/[email protected]"
      ],
      "env": {
        "STARKNET_RPC_URL": "<STARKNET_RPC_URL>",
        "PAY_MCP_SEPOLIA_ACCOUNT_ADDRESS": "<PAY_MCP_SEPOLIA_ACCOUNT_ADDRESS>",
        "PAY_MCP_SEPOLIA_PRIVATE_KEY": "<PAY_MCP_SEPOLIA_PRIVATE_KEY>",
        "PAY_MCP_STANDARD_X402_PAYEES": "<PAY_MCP_STANDARD_X402_PAYEES>",
        "PAY_MCP_STANDARD_X402_MAX_WEI": "<PAY_MCP_STANDARD_X402_MAX_WEI>",
        "PAY_MCP_STANDARD_X402_ACCOUNT_ADDRESS": "<PAY_MCP_STANDARD_X402_ACCOUNT_ADDRESS>",
        "PAY_MCP_STANDARD_X402_PRIVATE_KEY": "<PAY_MCP_STANDARD_X402_PRIVATE_KEY>",
        "PAY_MCP_EVM_KEYSTORE_PATH": "<PAY_MCP_EVM_KEYSTORE_PATH>",
        "PAY_MCP_EVM_PASSWORD_PATH": "<PAY_MCP_EVM_PASSWORD_PATH>",
        "PAY_MCP_EVM_NETWORKS": "<PAY_MCP_EVM_NETWORKS>",
        "PAY_MCP_EVM_PAYEES": "<PAY_MCP_EVM_PAYEES>",
        "PAY_MCP_EVM_MAX_PER_PAYMENT": "<PAY_MCP_EVM_MAX_PER_PAYMENT>",
        "PAY_MCP_EVM_MAX_PER_SESSION": "<PAY_MCP_EVM_MAX_PER_SESSION>",
        "PAY_MCP_EVM_I_ACCEPT_MAINNET_SPEND": "<PAY_MCP_EVM_I_ACCEPT_MAINNET_SPEND>",
        "PAY_MCP_EVM_ASSETS": "<PAY_MCP_EVM_ASSETS>"
      }
    }
  }
}

Replace the values in angle brackets with your own. Keys stay on your machine; we never see them.

Tools

This server runs locally, so its tools are listed by your MCP client once it starts.

Environment variables

Name	Description
`STARKNET_RPC_URL` Optional	Starknet RPC endpoint. Optional. The buy command contacts no node unless you name one (a Starknet mainnet node; the chain it serves must then be the offer's). The chain-reading tools default to a public node not operated by Vauban.
`PAY_MCP_SEPOLIA_ACCOUNT_ADDRESS` Optional	Starknet Sepolia account address for make_payment signer mode. Optional; without it make_payment uses the sponsored mode, which calls the sponsor over the network and settles a real Sepolia transfer it funds.
`PAY_MCP_SEPOLIA_PRIVATE_KEY` Optional, secret	Private key for that account. Optional; never required to try the tools.
`PAY_MCP_STANDARD_X402_PAYEES` Optional	Standard x402 path (Starknet): comma-separated payTo addresses pay_for_resource may pay. Empty pays nobody (fail closed). * pays any payee: avoid it.
`PAY_MCP_STANDARD_X402_MAX_WEI` Optional	Standard x402 path: cap on one payment in atomic units (default 0.1 STRK).
`PAY_MCP_STANDARD_X402_ACCOUNT_ADDRESS` Optional	Standard x402 path: a signer of its own (falls back to PAY_MCP_SEPOLIA_*).
`PAY_MCP_STANDARD_X402_PRIVATE_KEY` Optional, secret	Private key for that account. Optional.
`PAY_MCP_EVM_KEYSTORE_PATH` Optional	EVM path: path to your Web3 Secret Storage v3 keystore. Never a key in the environment.
`PAY_MCP_EVM_PASSWORD_PATH` Optional	EVM path: path to the file holding that keystore's password.
`PAY_MCP_EVM_NETWORKS` Optional	EVM path: comma-separated CAIP-2 networks pay_for_resource may pay on, e.g. eip155:84532. Empty pays nothing (fail closed).
`PAY_MCP_EVM_PAYEES` Optional	EVM path: comma-separated payTo addresses pay_for_resource may pay. Empty pays nobody (fail closed). * pays any payee, up to the session cap: avoid it.
`PAY_MCP_EVM_MAX_PER_PAYMENT` Optional	EVM path: cap on one payment, in atomic units of the asset (1000000 = 1 USDC). No default: unset refuses.
`PAY_MCP_EVM_MAX_PER_SESSION` Optional	EVM path: cap on the total value of the signed authorizations this process hands over, per network and asset, never credited back. No default: unset refuses.
`PAY_MCP_EVM_I_ACCEPT_MAINNET_SPEND` Optional	EVM path: comma-separated CAIP-2 value networks you consent to spend real money on, each named (e.g. eip155:8453). Required for any network other than Base Sepolia and Ethereum Sepolia.
`PAY_MCP_EVM_ASSETS` Optional	EVM path: comma-separated <CAIP-2>/<token address> entries payable. Default: the network's known USDC only.

Details

Package	`@vauban-pay/[email protected]` (NPM, stdio)
First published	23 Oct 2026
Last updated	23 Oct 2026
Registry name	`tech.vauban/pay-mcp`

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Local install

Installed and run on your own machine, so there is no public endpoint to check.

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