Koskamo

x402-presign-guard MCP

A community MCP server providing pre-sign transaction safety for AI agents. It decodes EVM calldata to detect drainer patterns such as unlimited approvals or transfers to malicious contracts, returning a GO/HOLD/BLOCK verdict. It supports pay-per-call settlement in USDC via x402 or flat MCP keys.

Package and access

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

x402-presign-guard MCP logo, by kaito3636Community listingLocal stdioSource reviewed; not executedPublished by kaito3636
Vendor documentation

What you can do with it

  • Decode EVM calldata to identify malicious spenders
  • Flag NFT drainer patterns like setApprovalForAll
  • Return GO/HOLD/BLOCK verdicts before signing
  • Check ERC-20 token safety for trading agents

Source and maintenance

Community listingRegistry 0.1.1
mcp-registry: io.github.kaito3636/x402-presign-guard@0.1.1Source repository
Maintenance checked

Packages and installation

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

x402-presign-guard 0.1.1

npm
x402-presign-guard package definition
{
  "version": "0.1.1",
  "transport": "stdio",
  "identifier": "x402-presign-guard",
  "registryType": "npm"
}

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": {
    "x402-presign-guard-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "x402-presign-guard@0.1.1"
      ]
    }
  }
}

Cline

Merge this local stdio configuration, replace every placeholder environment value, and restart Cline. Koskamo has not executed this package.
Cline configuration
{
  "mcpServers": {
    "x402-presign-guard-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "x402-presign-guard@0.1.1"
      ]
    }
  }
}

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": {
    "x402-presign-guard-mcp": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "x402-presign-guard@0.1.1"
      ]
    }
  }
}

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": {
    "x402-presign-guard-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "x402-presign-guard@0.1.1"
      ]
    }
  }
}

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