verify402 MCP

A community MCP server that provides a free preflight gate and paid on-chain truth checks for AI agents. It verifies payment requests and transaction calldata against chain state before signing, returning verdicts like PASS, CAUTION, or BLOCK with typed reasons and verifiable receipts to prevent blind signing.

Package and access

Local package with source-attributed installation metadata. Koskamo does not execute packages during review.

Community listingLocal stdioSource reviewed; not executedPublished by verify402

Vendor documentation

What you can do with it

Run free preflight checks on payment intents before signing
Verify token approvals and spender allowances on-chain
Check if arbitrage opportunities are real net of costs
Audit quotes for fairness and slippage risks

Source and maintenance

Community listingRegistry 1.0.9

mcp-registry: io.github.a32116150-ctrl/verify402-mcp@1.0.9 Source repository Project website

Maintenance checked: Oct 31, 2026, 10:27 PM UTC

Packages and installation

Source-provided package data. Koskamo has not executed or live-probed this package.

verify402-mcp 1.0.9

npm

verify402-mcp package definition

{
  "version": "1.0.9",
  "transport": "stdio",
  "identifier": "verify402-mcp",
  "registryType": "npm",
  "registryBaseUrl": "https://registry.npmjs.org",
  "environmentVariables": [
    {
      "name": "VERIFY402_URL",
      "description": "verify402 base URL"
    },
    {
      "name": "EVM_PRIVATE_KEY",
      "description": "Private key for a dedicated hot wallet. Omit for the free preflight_gate only. verify402-mcp@1.0.9 (this published release) defaults paid calls to Base Sepolia testnet (eip155:84532) for the public demo. Base mainnet (eip155:8453) is an explicit opt-in for a separate deployment and is not enabled by this release. Fund only Base Sepolia testnet USDC for the demo. Never use a main wallet."
    },
    {
      "name": "VERIFY402_NETWORKS",
      "default": "eip155:84532",
      "description": "Comma-separated EVM payment networks for paid calls. Default Base Sepolia testnet (eip155:84532); set eip155:8453 explicitly for Base mainnet. The supported network-to-canonical-asset map is constrained to Base Sepolia and Base mainnet."
    },
    {
      "name": "MAX_PAYMENT_USD",
      "description": "Hard cap on one x402 payment in USD (default 0.25). Enforced before signing."
    },
    {
      "name": "MAX_DAILY_USD",
      "description": "Optional cap for total spend per UTC day across restarts."
    }
  ]
}

Tools

Reported by the attributed source; not independently observed by Koskamo.

No tool definitions available.

Connect from your client

Each snippet configures the same source-provided package; replace placeholders before use.

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Cursor

Merge this local stdio configuration, replace every placeholder environment value, and restart Cursor. Koskamo has not executed this package.

Cursor configuration

{
  "mcpServers": {
    "verify402-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "verify402-mcp@1.0.9"
      ],
      "env": {
        "VERIFY402_URL": "<YOUR_VERIFY402_URL>",
        "EVM_PRIVATE_KEY": "<YOUR_EVM_PRIVATE_KEY>",
        "VERIFY402_NETWORKS": "<YOUR_VERIFY402_NETWORKS>",
        "MAX_PAYMENT_USD": "<YOUR_MAX_PAYMENT_USD>",
        "MAX_DAILY_USD": "<YOUR_MAX_DAILY_USD>"
      }
    }
  }
}

Cline

Merge this local stdio configuration, replace every placeholder environment value, and restart Cline. Koskamo has not executed this package.

Cline configuration

{
  "mcpServers": {
    "verify402-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "verify402-mcp@1.0.9"
      ],
      "env": {
        "VERIFY402_URL": "<YOUR_VERIFY402_URL>",
        "EVM_PRIVATE_KEY": "<YOUR_EVM_PRIVATE_KEY>",
        "VERIFY402_NETWORKS": "<YOUR_VERIFY402_NETWORKS>",
        "MAX_PAYMENT_USD": "<YOUR_MAX_PAYMENT_USD>",
        "MAX_DAILY_USD": "<YOUR_MAX_DAILY_USD>"
      }
    }
  }
}

VS Code

Merge this local stdio configuration, replace every placeholder environment value, and restart VS Code. Koskamo has not executed this package.

VS Code configuration

{
  "servers": {
    "verify402-mcp": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "verify402-mcp@1.0.9"
      ],
      "env": {
        "VERIFY402_URL": "<YOUR_VERIFY402_URL>",
        "EVM_PRIVATE_KEY": "<YOUR_EVM_PRIVATE_KEY>",
        "VERIFY402_NETWORKS": "<YOUR_VERIFY402_NETWORKS>",
        "MAX_PAYMENT_USD": "<YOUR_MAX_PAYMENT_USD>",
        "MAX_DAILY_USD": "<YOUR_MAX_DAILY_USD>"
      }
    }
  }
}

Claude Desktop

Merge this local stdio configuration, replace every placeholder environment value, and restart Claude Desktop. Koskamo has not executed this package.

Claude Desktop configuration

{
  "mcpServers": {
    "verify402-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "verify402-mcp@1.0.9"
      ],
      "env": {
        "VERIFY402_URL": "<YOUR_VERIFY402_URL>",
        "EVM_PRIVATE_KEY": "<YOUR_EVM_PRIVATE_KEY>",
        "VERIFY402_NETWORKS": "<YOUR_VERIFY402_NETWORKS>",
        "MAX_PAYMENT_USD": "<YOUR_MAX_PAYMENT_USD>",
        "MAX_DAILY_USD": "<YOUR_MAX_DAILY_USD>"
      }
    }
  }
}

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