x402-gated Stripe invoice endpoint on Base, paying $0.02 per request in USDC.
What it does
This endpoint at lowpaymentfee.com provides x402-protocol access to a Stripe invoice resource (`/api/v1/stripe/invoices/99`). It is part of a broader platform offering pay-per-call APIs across data analytics, AI/ML inference, finance/Web3, and infrastructure utility categories — all priced at $0.02 per request and settled in USDC on the Base network.
The specific endpoint probed (`/api/v1/stripe/invoices/99`) returns a valid x402 challenge (HTTP 402) requesting payment of 20,000 base units of USDC (0x8335…2913 on Base, 6 decimals → $0.02) via the "exact" scheme. Payment is directed to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout. The response MIME type is `application/json` and the method is POST.
Documentation on the site is extremely thin — 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, and no explanation of what data the `/stripe/invoices/99` endpoint actually returns. The landing page lists many other endpoints but does not include this specific Stripe invoices path, so its purpose and payload remain unclear. Treat this listing as a stub until richer documentation becomes available.
Capabilities
Use cases
- —Retrieving Stripe invoice data via a single paid API call
- —Programmatic access to invoice records without API key management
- —Agent-driven invoice lookups settled in USDC on Base
Fit
Best for
- —Agents or bots that need keyless, pay-per-call access to invoice data
- —Developers who prefer crypto micropayments over subscription billing
- —Workflows requiring on-demand Stripe invoice retrieval
Not for
- —Users needing detailed API documentation or request/response schemas before integrating
- —High-volume batch invoice processing where per-call pricing is inefficient
- —Anyone requiring non-crypto payment rails
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/stripe/invoices/99 \
-H "X-PAYMENT: <x402-payment-token>" \
-H "Content-Type: application/json"Endpoint
Quality
The endpoint is live and returns a well-formed x402 challenge with clear pricing ($0.02 USDC on Base). However, there is no OpenAPI spec, no request/response schema, no documentation beyond a wallet-connect prompt, and the specific /stripe/invoices/99 path is not listed on the landing page. The actual functionality and response payload are unknown.
Warnings
- —No OpenAPI or schema documentation available for this endpoint
- —Docs, API, pricing, and README pages all render only 'Connect wallet' with no content
- —The /api/v1/stripe/invoices/99 path is not listed among the site's advertised endpoints — its purpose is unclear
- —No request body schema or response examples are provided anywhere
Citations
- —The endpoint returns a valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Basehttps://lowpaymentfee.com/api/v1/stripe/invoices/99
- —The platform advertises $0.02 per request pricing with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/stripe/invoices/99