x402check MCP

An MCP server that provides pre-payment risk checks for AI agents and wallets. It screens counterparties against OFAC SDN lists, phishing feeds, and drainer infrastructure, simulates transactions, and returns signed attestations to ensure agents only pay verified recipients.

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Package and access

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

Community listingLocal stdioSource reviewed; not executedPublished by caiovicentino

You need:Every check is paid; there is no free tier.

Vendor documentation

What you can do with it

Screen counterparty addresses against sanctions and phishing feeds before payment
Simulate transactions to detect hidden recipients or drainer code
Enforce signing guards that only allow transactions after verified risk checks
Verify signed attestations to ensure verdicts are authentic and bound to requests

Source and maintenance

Community listingRegistry 0.3.3

mcp-registry: io.github.caiovicentino/x402check@0.3.3 Source repository Project website

Maintenance checked: Oct 31, 2026, 10:59 PM UTC

Packages and installation

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

@x402check/mcp 0.3.3

npm

@x402check/mcp package definition

{
  "version": "0.3.3",
  "transport": "stdio",
  "identifier": "@x402check/mcp",
  "registryType": "npm",
  "registryBaseUrl": "https://registry.npmjs.org",
  "environmentVariables": [
    {
      "name": "X402CHECK_CREDIT_TOKEN",
      "format": "string",
      "description": "Prepaid credit token (x402c_…, from POST https://x402check.xyz/v1/credits): $0.001 a check"
    },
    {
      "name": "X402CHECK_PAYER_KEY",
      "format": "string",
      "description": "Private key of a dedicated low-balance wallet: pays the x402 resources x402check_pay clears, and per-call checks without credits"
    },
    {
      "name": "X402CHECK_BUDGET_USD",
      "format": "string",
      "default": "1.00",
      "description": "Spend cap for this server process: the payer's spend (checks and resources), and separately what checks spend from prepaid credits"
    },
    {
      "name": "X402CHECK_PINNED_KEYS",
      "format": "string",
      "description": "Comma-separated RFC 7638 thumbprints of the attestation keys accepted (default: x402check's own keys, for its own issuer)"
    },
    {
      "name": "X402CHECK_MAX_PAYMENT_USD",
      "format": "string",
      "default": "0.05",
      "description": "The most a single payment may cost (a check or a resource)"
    }
  ]
}

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.

This server is operated by the named third party. Listing and endpoint checks are not an endorsement or a security audit. Review the operator's permissions, terms, and data handling before connecting. How listings are checked and corrected.

Cursor

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

Cursor configuration

{
  "mcpServers": {
    "x402check-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "@x402check/mcp@0.3.3"
      ],
      "env": {
        "X402CHECK_CREDIT_TOKEN": "<YOUR_X402CHECK_CREDIT_TOKEN>",
        "X402CHECK_PAYER_KEY": "<YOUR_X402CHECK_PAYER_KEY>",
        "X402CHECK_BUDGET_USD": "<YOUR_X402CHECK_BUDGET_USD>",
        "X402CHECK_PINNED_KEYS": "<YOUR_X402CHECK_PINNED_KEYS>",
        "X402CHECK_MAX_PAYMENT_USD": "<YOUR_X402CHECK_MAX_PAYMENT_USD>"
      }
    }
  }
}

Cline

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

Cline configuration

{
  "mcpServers": {
    "x402check-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "@x402check/mcp@0.3.3"
      ],
      "env": {
        "X402CHECK_CREDIT_TOKEN": "<YOUR_X402CHECK_CREDIT_TOKEN>",
        "X402CHECK_PAYER_KEY": "<YOUR_X402CHECK_PAYER_KEY>",
        "X402CHECK_BUDGET_USD": "<YOUR_X402CHECK_BUDGET_USD>",
        "X402CHECK_PINNED_KEYS": "<YOUR_X402CHECK_PINNED_KEYS>",
        "X402CHECK_MAX_PAYMENT_USD": "<YOUR_X402CHECK_MAX_PAYMENT_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": {
    "x402check-mcp": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "@x402check/mcp@0.3.3"
      ],
      "env": {
        "X402CHECK_CREDIT_TOKEN": "<YOUR_X402CHECK_CREDIT_TOKEN>",
        "X402CHECK_PAYER_KEY": "<YOUR_X402CHECK_PAYER_KEY>",
        "X402CHECK_BUDGET_USD": "<YOUR_X402CHECK_BUDGET_USD>",
        "X402CHECK_PINNED_KEYS": "<YOUR_X402CHECK_PINNED_KEYS>",
        "X402CHECK_MAX_PAYMENT_USD": "<YOUR_X402CHECK_MAX_PAYMENT_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": {
    "x402check-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "@x402check/mcp@0.3.3"
      ],
      "env": {
        "X402CHECK_CREDIT_TOKEN": "<YOUR_X402CHECK_CREDIT_TOKEN>",
        "X402CHECK_PAYER_KEY": "<YOUR_X402CHECK_PAYER_KEY>",
        "X402CHECK_BUDGET_USD": "<YOUR_X402CHECK_BUDGET_USD>",
        "X402CHECK_PINNED_KEYS": "<YOUR_X402CHECK_PINNED_KEYS>",
        "X402CHECK_MAX_PAYMENT_USD": "<YOUR_X402CHECK_MAX_PAYMENT_USD>"
      }
    }
  }
}

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