SpendPreflight MCP

An MCP server for AI agents to perform risk checks before making x402 payments. It provides sanctions screening, domain age verification, and allow/hold/block decisions for payees, ensuring agents spend money safely without holding funds.

Endpoint and access

No sign-in: your client connects and lists tools immediately, with no account or key.

No sign-inEndpoint checked 2026-10-18Operated by SpendPreflight

MCP endpoint (Streamable HTTP)

https://api.spendpreflight.com/mcp

Vendor documentation

What you can do with it

Screen payee wallet addresses against OFAC sanctions lists
Check domain registration age and DNS presence
Preflight x402 payment challenges against custom risk rules
Get allow, hold, or block decisions with plain reasons

Tools advertised by the last live check:

lint_endpoint
check_payee
preflight_payment
check_endpoint
get_service_info

Connect from your client

Each snippet registers the same endpoint; pick the client you 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.

Claude Code

Run this once in a terminal. It registers a Streamable HTTP server. Use --scope project to write .mcp.json for the repo.

Claude Code configuration

claude mcp add --transport http spendpreflight-mcp https://api.spendpreflight.com/mcp

Codex

Run this once. Codex stores MCP servers in ~/.codex/config.toml (or .codex/config.toml in a trusted project).

Codex configuration

codex mcp add spendpreflight-mcp --url https://api.spendpreflight.com/mcp

Cursor

Merge this server into .cursor/mcp.json in your project, then enable spendpreflight-mcp in your MCP settings.

Cursor configuration

{
  "mcpServers": {
    "spendpreflight-mcp": {
      "url": "https://api.spendpreflight.com/mcp"
    }
  }
}

Cline

Merge this into cline_mcp_settings.json (Cline → MCP Servers → Configure). The type must be streamableHttp for a remote HTTP server.

Cline configuration

{
  "mcpServers": {
    "spendpreflight-mcp": {
      "type": "streamableHttp",
      "url": "https://api.spendpreflight.com/mcp",
      "disabled": false
    }
  }
}

VS Code

Merge this server into .vscode/mcp.json. Use MCP: List Servers to start spendpreflight-mcp and inspect its tools.

VS Code configuration

{
  "servers": {
    "spendpreflight-mcp": {
      "type": "http",
      "url": "https://api.spendpreflight.com/mcp"
    }
  }
}

Gemini CLI

Run this once. It writes .gemini/settings.json in the current project; pass --scope user for ~/.gemini/settings.json.

Gemini CLI configuration

gemini mcp add --transport http spendpreflight-mcp https://api.spendpreflight.com/mcp

Claude Desktop

Merge this into claude_desktop_config.json (macOS: ~/Library/Application Support/Claude/, Windows: %APPDATA%\Claude\), then restart Claude Desktop.

Claude Desktop configuration

{
  "mcpServers": {
    "spendpreflight-mcp": {
      "url": "https://api.spendpreflight.com/mcp"
    }
  }
}

Windsurf

Merge this into ~/.codeium/windsurf/mcp_config.json, then refresh MCP in Cascade. Windsurf remote servers use serverUrl, not url.

Windsurf configuration

{
  "mcpServers": {
    "spendpreflight-mcp": {
      "serverUrl": "https://api.spendpreflight.com/mcp"
    }
  }
}

See all 166

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