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

by com.oroboros-design.angel
OverviewDiscussionsAdmin

Server Details

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

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Status
Healthy
Uptime
100.0% over the last 24 hours
Last Tested
Transport
Streamable HTTP · MCP 2025-11-25
URL
Repository
daoudandiaye98-alt/mcp-checkout-guard
GitHub Stars
0
Server Listing
checkout-guard
ChatGPT
–
Claude
–

TDQS

A3.8/5.0

Scored across 2 tools

Disambiguation4/5

The two tools have distinct core jobs: buy_pack_with_card purchases prepaid call packs, while preflight inspects unknown endpoints before payment. However, both touch payment/checkout flows, and the heavy cross-references to absent tools (get_signals, input-guard, gas-window) create some workflow confusion.

Naming Consistency3/5

buy_pack_with_card follows a snake_case verb_noun pattern, while preflight is a single noun-like term. The mixed convention is still readable but not consistent.

Tool Count3/5

Two tools is thin for a server whose descriptions imply a multi-step pre-purchase workflow. The core preflight capability is present, but the surface feels under-provisioned for the apparent scope.

Completeness2/5

The tool descriptions explicitly point to follow-up tools (get_signals, input-guard, gas-window) that are not included in this server, creating dead ends. There are also no tools for managing or inspecting purchased packs beyond the initial purchase.

Available Tools

2 tools
buy_pack_with_cardTradeSignal: pack by cardAInspect

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.

Inputs: calls, email.

preflightPre-purchase check for any shop, checkout link, payment page, API or x402 endpointA
Read-only
Inspect

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).

Inputs: url (required), method, payment_tx, bundle_token, +3 more.

Tool Schema Changelog

Recent tool additions, removals, and schema changes observed during successful MCP inspections.

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