{"price_usd":"0.10","how":"POST https://graded.sh/v1/topup with header \"Authorization: Bearer <gwk_ key>\". The route is x402-gated (exact scheme, Base USDC): pay 0.10 USDC and your account is credited 1:1. Repeat for more credit. Any x402 v2 client works (e.g. @x402/fetch wrapFetchWithPaymentFromConfig).","fiat":"Card top-up: POST https://graded.sh/v1/stripe/checkout with Authorization: Bearer <gwk_ key> and JSON body {\"pack\": 5 | 10 | 20} (USD). Open the returned url, pay by card, credits land 1:1."}