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

com.oroboros-design.angel由 angel.oroboros-design.com 發布官方發布者v1.0.0更新於 Nov 14, 2026

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

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

已驗證Streamable HTTP可網頁執行金融安全與監控

概覽

AI 產生的概覽

遠端 MCP 伺服器，在購買前對商店、結帳或付款連結、付費 API 或 x402 端點做安全檢查，回傳 pay、caution 或 do_not_pay 結論。

可以做什麼
  • 在代理付款或呼叫前對網址執行 preflight 檢查：TLS、網域年齡、仿冒網域、重新導向至境外閘道、付款服務商、頁面中的卡號欄位、表單以及針對代理的誘導文字
  • 檢查 x402 端點的 USDC 合約、payTo 位址、EIP-712 網域與價格陷阱
  • 給出 pay、caution 或 do_not_pay 結論及每一項理由
  • 免費次數用完後，可用信用卡以歐元購買預付呼叫包
適用情境
當代理即將在不熟悉的商店付款、跟隨付款連結，或呼叫未知的付費 API 或 x402 端點，並希望在資金流出前取得第二意見時使用。
執行需求
遠端 HTTP 端點，無需安裝或帳號。可用 X-API-Key 標頭（stdio 橋接用 ANGEL_API_KEY）識別代理以使用 3 次免費呼叫。之後每次呼叫透過 x402 在 Base 上以 USDC 付費、使用預付 bundle token，或透過 buy_pack_with_card 以信用卡購買。為需要本機程序的用戶端提供 Node 18+ 的 stdio 橋接。
安裝前請注意
每個代理 3 次免費呼叫後即為付費服務；付款透過 Base 上的 USDC 或信用卡完成，涉及真實資金。結論為 pay 時，回覆可能附帶聯盟 partner_link，除非將 partner_link 設為 false，營運方會從中取得佣金。被檢查的網址會傳送到第三方伺服器。

安裝

在 SourceWeft 中

  1. 開啟 儀表板中的 Checkout Guard — pre-purchase check for shops, payment links and paid APIs，將其新增到工作區。
  2. 為需要使用其工具的對話啟用該服務。

Web executable，透過 Streamable HTTP。 遠端服務在工作區中設定後即可從網頁執行環境執行。

交給代理程式安裝

把這段提示詞貼上到 Claude Code、Codex、Cursor 等代理程式，或 SourceWeft 對話中。代理程式會讀取該伺服器的安裝指南，先向你展示發布者、端點和登入方式，經你同意後再把它新增到你的客戶端。金鑰不會寫進任何命令。

閱讀 https://sourceweft.com/mcp/com.oroboros-design.angel%2Fcheckout-guard/install.md，並按其中說明把這個 MCP 伺服器接入我的客戶端。修改任何設定之前，先告訴我它的發布者、端點和登入方式，等我確認。不要把 API 金鑰寫進命令或我會提交的檔案；問我金鑰應從哪裡取得。

檢視代理程式所依據的安裝指南

其他 MCP 客戶端

把它新增到你客戶端的 mcpServers 設定中。

{
  "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.

來源：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).

輸入參數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.

輸入參數callsemail

版本歷史

1
  1. v1.0.0最新Nov 14, 2026

評分

已滿足適用檢查項的 100%

該評分衡量此收錄條目的完整程度，依據註冊中心條目、端點與公開來源計算得出。它不是對伺服器本身的評價，也不表示伺服器安全或目前可用：可連通性是帶日期的檢查結果，評分也不包含安裝量或使用者評價。

  • 近 30 天內可連通必需25 分
  • 已宣告認證方式必需10 分
  • 已列出工具必需15 分
  • 描述必需15 分
  • 圖示10 分
  • 文件15 分
  • 授權條款10 分

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