Checkout Guard — pre-purchase check for shops, payment links and paid APIs

com.oroboros-design.angel由 angel.oroboros-design.com 发布官方发布者v1.0.0更新于 Nov 14, 2026

Pre-purchase check for any shop, checkout or payment link, paid API or x402 endpoint.

发布方自己的服务：Agent safety checks: prompt-injection scan, honeypot check, x402 preflight + crypto data (USDC/x402)

已验证Streamable HTTP可网页运行金融安全与监控

概览

AI 生成的概览

远程 MCP 服务器，在购买前对商店、结账或支付链接、付费 API 或 x402 端点做安全检查，返回 pay、caution 或 do_not_pay 结论。

可以做什么
  • 在智能体付款或调用前对网址执行 preflight 检查：TLS、域名年龄、仿冒域名、跳转到境外网关、支付服务商、页面中的卡号字段、表单以及针对智能体的诱导文字
  • 检查 x402 端点的 USDC 合约、payTo 地址、EIP-712 域和价格陷阱
  • 给出 pay、caution 或 do_not_pay 结论及每一条理由
  • 免费次数用完后，可用银行卡以欧元购买预付费调用包
适用场景
当智能体即将在不熟悉的商店付款、跟随支付链接，或调用未知的付费 API 或 x402 端点，并希望在资金流出前获得第二意见时使用。
运行要求
远程 HTTP 端点，无需安装或账号。可用 X-API-Key 请求头（stdio 桥接用 ANGEL_API_KEY）标识智能体以使用 3 次免费调用。之后每次调用通过 x402 在 Base 上以 USDC 付费、使用预付费 bundle token，或通过 buy_pack_with_card 用银行卡购买。为需要本地进程的客户端提供 Node 18+ 的 stdio 桥接。
安装前请注意
每个智能体 3 次免费调用后为付费服务；付款通过 Base 上的 USDC 或银行卡完成，涉及真实资金。结论为 pay 时，回复可能附带联盟 partner_link，除非将 partner_link 设为 false，运营方会从中获得佣金。被检查的网址会发送到第三方服务器。

安装

在 SourceWeft 中

  1. 打开 控制台中的 Checkout Guard — pre-purchase check for shops, payment links and paid APIs，将其添加到工作区。
  2. 为需要使用其工具的对话启用该服务。

Web executable，通过 Streamable HTTP。 远程服务在工作区中配置后即可从网页运行时运行。

交给智能体安装

把这段提示词粘贴到 Claude Code、Codex、Cursor 等智能体，或 SourceWeft 对话中。智能体会读取该服务器的安装指南，先向你展示发布者、端点和登录方式，经你同意后再把它添加到你的客户端。密钥不会写进任何命令。

阅读 https://sourceweft.com/mcp/com.oroboros-design.angel%2Fcheckout-guard/install.md，并按其中说明把这个 MCP 服务器接入我的客户端。修改任何配置之前，先告诉我它的发布者、端点和登录方式，等我确认。不要把 API 密钥写进命令或我会提交的文件；问我密钥应从哪里获取。

查看智能体所依据的安装指南

其他 MCP 客户端

把它添加到你客户端的 mcpServers 配置中。

{
  "mcpServers": {
    "checkout-guard-pre-purchase-check-for-sh": {
      "type": "http",
      "url": "https://angel.oroboros-design.com/mcp/checkout-guard"
    }
  }
}

README

mcp-checkout-guard

Pre-purchase check for shops, payment links and paid APIs — a single-purpose MCP server for AI agents. No install, no account: it runs as a remote server; this repo also has a zero-dependency stdio bridge.

https://angel.oroboros-design.com/mcp/checkout-guard

Use it

Claude Code

bash
claude mcp add --transport http checkout-guard https://angel.oroboros-design.com/mcp/checkout-guard

Claude Desktop, Cursor, Windsurf, VS Code (remote server)

json
{ "mcpServers": { "checkout-guard": { "url": "https://angel.oroboros-design.com/mcp/checkout-guard" } } }

Any stdio client (Node 18+)

json
{ "mcpServers": { "checkout-guard": { "command": "npx", "args": ["-y", "github:daoudandiaye98-alt/mcp-checkout-guard"] } } }

Then ask your agent, for example: Before paying at https://shop.example.com/checkout, run preflight and stop unless the verdict is pay.

Tools

ToolPriceWhat it does
preflight3 free calls per agent, then 0.25 USDCOne request to the url: TLS, domain age, look-alike domains, redirects to foreign gateways, payment provider, card fields in the page, http forms, text aimed at agents and, for x402, USDC contract, payTo, EIP-712 domain and price traps. Verdict pay, caution or do_not_pay with every reason.
buy_pack_with_card—Prepaid calls by card (Stripe) when the free calls are used up.

Paying

The first 3 paid calls per agent are free (identify your agent with the header X-API-Key, or set ANGEL_API_KEY for the stdio bridge). After that each call is paid per request in USDC on Base via x402 (params._meta["x402/payment"]), with a prepaid pack (bundle_token) or by card (buy_pack_with_card). The 402 answer names the exact amount and the pay-to address before anything is signed.

Disclosure: on verdict pay for a shop with an affiliate programme (for example Amazon), the answer can include a partner_link to the same merchant; Angel may earn a commission if you buy through it, the merchant sets the price, and the checked url is just as safe. Pass partner_link: false to leave it out.

More

  • Same checks as a library: npm i angel-agent-guard · pip install angel-agent-guard (angel-agent-guard)
  • All of Angel's tools in one server: https://angel.oroboros-design.com/agenten/signal/mcp · A2A agent card: https://angel.oroboros-design.com/.well-known/agent.json
  • MCP Registry: com.oroboros-design.angel/checkout-guard

Operated by Oroboros Design (Köln, Germany). MIT licence for the code in this repo.

来源：README.md，提交 f1d563b

工具

2

preflight

Pre-purchase check for any shop, checkout link, payment page, API or x402 endpoint

Before an agent buys, pays or calls an unknown endpoint: one unpaid request to any https shop, checkout or payment link (Stripe, Shopify, PayPal and others), API or x402 endpoint. Checks TLS, domain age, look-alike domains, redirects to foreign gateways, the payment provider, card fields in the page, http forms, text aimed at agents in the page and, for x402, USDC contract, payTo, EIP-712 domain and price traps. Verdict pay, caution or do_not_pay, risk_score, merchant_signals. 0.25 USDC base (new payers 0.25, >10 payments 0.175; 5 pack calls). After: input-guard on the page text you will act on, gas-window before you settle on Base (the result's next field has the exact call).

输入参数url必填methodpayment_txbundle_tokenpartner_linkmax_price_usdpayer_address

buy_pack_with_card

TradeSignal: pack by card

For agents and people without USDC: prepaid packs paid in EUR by card or Link (100 calls €5.00 · 500 calls €25.00 · 5,000 calls €199.00) — including Link's wallet for agents (one-time card, approved by the human). Returns checkout_url; after payment the success page (Accept: application/json) returns the bundle_token, and it is e-mailed. After: get_signals with bundle_token.

输入参数callsemail

版本历史

1
  1. v1.0.0最新Nov 14, 2026

评分

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