Security & Testing

x402check.dev

Provides trust and safety preflight checks for x402 payment endpoints, including payTo wallet verification, batch seller URL checks, and tool comparisons before payment.

x402 supported1 endpoint4 known toolsFirst detected November 1, 2026Last detected November 1, 2026

ENDPOINT 1

https://x402check.dev/mcp

No auth detected

MCP server metadata

Name: x402check
Version: 0.2.2

Capabilities

tools

Server instructions

Before any x402 payment, call preflight_check (or verify_payto). To compare sellers, call compare_tools / preflight_batch. Unit $0.002/URL. Deny pay when verdict=avoid; escalate on caution; still enforce maxAmount on ok. We probe the endpoint's live 402 + history (not wallet OFAC/simulation).

Known tools 4

preflight_check

Mandatory trust preflight before paying any x402 endpoint.

Inferred read-only

verify_payto

Verify the payTo / receiving wallet an x402 seller demands before you sign.

Inferred read-only

preflight_batch

Trust-check up to 25 x402 seller URLs in one request.

Inferred read-only

compare_tools

Compare several x402 tools before choosing which to pay.

Potential side effects

CONNECT WITH APPROVAL

Client installation

Review this server and its permissions before adding it. Secret placeholders must be set locally.

Codex

~/.codex/config.toml

[mcp_servers.x402check]
url = "https://x402check.dev/mcp"
enabled = true

Claude Code

.mcp.json

{
  "mcpServers": {
    "x402check": {
      "type": "http",
      "url": "https://x402check.dev/mcp"
    }
  }
}

Claude Desktop

Settings → Connectors → Add custom connector

Name: x402check
Remote MCP URL: https://x402check.dev/mcp

Add this remote URL as a custom connector in Claude Desktop. Availability depends on the user plan and workspace policy.

Cursor

.cursor/mcp.json

{
  "mcpServers": {
    "x402check": {
      "url": "https://x402check.dev/mcp"
    }
  }
}

Visual Studio Code

.vscode/mcp.json

Add to Visual Studio Code

{
  "servers": {
    "x402check": {
      "type": "http",
      "url": "https://x402check.dev/mcp"
    }
  }
}

Generic MCP

Client-specific MCP configuration

{
  "name": "x402check",
  "transport": "streamable-http",
  "url": "https://x402check.dev/mcp"
}

MCP Inspector

Run the official MCP Inspector locally and enter the indexed Streamable HTTP endpoint.

TRUST AND VERIFICATION EVIDENCE

Loading Trust v2 evidence…

Checking the associated registrable domain. The BuiltWith key remains server-side.

Indexed

Evidence is source-attributed and does not guarantee that a third-party server is safe. Risk labels are conservative metadata heuristics.