ZERO Payment Guard MCP Server

About ZERO Payment Guard

Remote MCP server with x402-over-MCP paid tools: x402_preflight ($0.005, checks the asset is canonical Circle USDC, price/scheme/timeout sanity, payTo contract/balance) and usdc_payment_check ($0.002, verifies a Base tx paid native USDC to a recipient). Free sample_report tool. Also plain HTTP x402 routes; see /llms.txt.

ZERO Payment Guard tools (11)

Read from the live server on Nov 13, 2026. These are the tools your AI assistant can call once connected.

company_brief

Paid $0.003 per call (x402, USDC on Base). One call to research a company: everything domain_enrich returns (socials, email provider, SPF/DMARC, DNS provider, RDAP age, tech stack, SaaS signals) plus its homepage and About page as clean Mar

page_extract_batch

Paid $0.008 per call (x402, USDC on Base). Extract up to 10 public web pages in parallel to clean Markdown + metadata. Per-URL errors are inline; fails (not charged) only if no URL succeeds.

domain_enrich

Paid $0.002 per call (x402, USDC on Base). Domain, URL or work email to a company profile from public sources: name, description, logo, social profiles, homepage contact emails/phones; email provider from MX, SPF/DMARC policy; DNS provider;

page_extract

Paid $0.001 per call (x402, USDC on Base). Fetch a public web page and return its main content as clean Markdown plus metadata: title, description, canonical, language, author, dates, OpenGraph/Twitter card, JSON-LD types, headings outline,

x402_preflight

Paid $0.005 per call (x402, USDC on Base). Before your agent pays an unknown x402 endpoint: fetch its 402 unpaid and check the asset is canonical Circle USDC for that network, price/scheme/timeout sanity, and payTo (contract or EOA, USDC ba

usdc_payment_check

Paid $0.002 per call (x402, USDC on Base). Verify a Base mainnet transaction paid native Circle USDC (not bridged USDbC) to a recipient, with minimum amount and confirmations. Use before releasing goods or marking an invoice paid. Verdict p

token_check

Paid $0.003 per call (x402, USDC on Base). Before accepting, swapping or approving a token on Base: is it a contract, ERC-20 metadata, canonical official deployment (USDC, EURC, WETH, cbBTC...), impersonation of a major symbol, upgradeable

basename_resolve

Paid $0.001 per call (x402, USDC on Base). Resolve a Basename (alice.base.eth) to its Base address, or an address to its primary Basename with forward-verification. Use before sending funds to a name.

wallet_snapshot

Paid $0.002 per call (x402, USDC on Base). One call: ETH and canonical Base token balances (native USDC, USDbC, EURC, WETH, cbBTC, cbETH, DAI, USDT), nonce, EOA or contract, flags (fresh/unused address, holds bridged USDbC). Use before send

tx_status

Paid $0.001 per call (x402, USDC on Base). State not_found/pending/success/reverted, block, confirmations, from/to, fee in ETH (incl. L1 fee), method selector, decoded ERC-20 Transfer events with symbols/amounts (canonical tokens flagged).

sample_report

Free: real live x402 preflight of a fixed sample endpoint and a token check of USDC on Base, same shapes as the paid tools.

How to connect ZERO Payment Guard to Claude, Cursor or VS Code

ZERO Payment Guard runs as a hosted remote MCP server at https://zero-payment-guard.worker.beacon.host/mcp. Add that URL to your MCP client's config (Claude Code, Cursor, Windsurf or VS Code) and the tools appear immediately, no install required.

{
  "mcpServers": {
    "zero-payment-guard": {
      "url": "https://zero-payment-guard.worker.beacon.host/mcp"
    }
  }
}

Claude Code: claude mcp add --transport http zero-payment-guard https://zero-payment-guard.worker.beacon.host/mcp. VS Code's .vscode/mcp.json uses a servers key instead of mcpServers (see how). Servers that require OAuth or an API key will prompt on first use.