x402-gated Stripe invoice endpoint on Base, paying $0.02 in USDC per request.
What it does
This endpoint at lowpaymentfee.com provides premium API access to a Stripe invoice resource (invoice ID 108) via the x402 payment protocol. It is part of a broader platform that offers a variety of pay-per-call APIs spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities — all gated behind x402 challenges settled in USDC on the Base network.
The specific endpoint `/api/v1/stripe/invoices/108` accepts POST requests and returns `application/json`. The x402 challenge advertises a maximum amount of 20,000 base units of USDC (contract `0x8335…2913` on Base), which equals $0.02 per call (USDC uses 6 decimals). Payment is sent to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` with a timeout of 300 seconds. No API keys or rate limits are required — access is granted purely through the x402 payment header.
Documentation on the site is extremely sparse: the docs, API, pricing, and README pages all render only a "Connect wallet" prompt with no further content. There is no OpenAPI spec, no request/response schema beyond the x402 challenge's `outputSchema`, and no explanation of what data the invoice endpoint actually returns. The platform's landing page lists many other endpoints across categories (analytics, AI, finance, utilities) all at the same $0.02 price point, but details on input parameters and response formats are absent.
Capabilities
Use cases
- —Retrieving Stripe invoice data (invoice 108) via a single paid API call
- —Demonstrating x402 payment protocol integration for agent-to-agent commerce
- —Accessing premium data endpoints without traditional API key management
Fit
Best for
- —Developers experimenting with x402 payment-gated APIs
- —Agents that can settle USDC payments on Base for per-call access
- —Projects needing keyless, pay-as-you-go API access
Not for
- —Users who need detailed API documentation or request/response schemas before integrating
- —High-volume consumers who want subscription-based pricing rather than per-call charges
- —Anyone without a Base-compatible USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/stripe/invoices/108 \
-H "X-PAYMENT: <x402-payment-token>" \
-H "Content-Type: application/json"Endpoint
Quality
The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI spec, no documentation of request parameters or response schema, and the docs/pricing/README pages are all empty. The purpose of this specific invoice endpoint is unclear beyond the generic 'Premium API Access' label.
Warnings
- —No OpenAPI or schema documentation available — request parameters and response format are unknown
- —All documentation pages (docs, API, pricing, README) return only a 'Connect wallet' prompt with no content
- —The specific purpose of /api/v1/stripe/invoices/108 is not explained; 'Premium API Access' is generic
- —This endpoint path references a specific Stripe invoice ID (108), which may be a demo or placeholder
Citations
- —The x402 challenge advertises maxAmountRequired of 20000 base units of USDC on Base networkhttps://lowpaymentfee.com/api/v1/stripe/invoices/108
- —USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/stripe/invoices/108
- —Platform advertises $0.02 per request with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —Docs, API, pricing, and README pages render only 'Connect wallet' with no additional contenthttps://lowpaymentfee.com/docs