x402-gated Stripe invoice endpoint on Base, paying $0.02 in USDC per request.
What it does
This endpoint at lowpaymentfee.com exposes a specific Stripe invoice resource (`/api/v1/stripe/invoices/23`) behind an x402 payment wall. It is part of a broader platform that offers dozens of pay-per-call APIs spanning data analytics, AI/ML inference, finance/Web3 data, and utility services — all priced at $0.02 per request and settled in USDC on the Base network.
The x402 challenge confirms the endpoint is live and accepts POST requests. Payment is made via the "exact" scheme to a specified wallet address, with the asset being USDC (contract `0x8335…2913` on Base). The maxAmountRequired of 20,000 base units corresponds to $0.02 (USDC uses 6 decimals). No API keys or rate limits are advertised; access is granted purely through the x402 payment header.
The specific functionality of this particular endpoint — a Stripe invoice resource — is not well-documented on the site. The landing page lists many other API categories (analytics, AI, finance, infrastructure) but does not describe a `/stripe/invoices` route. The endpoint's description field simply reads "Premium API Access," which is generic. Without further documentation or example responses, the exact data returned by this invoice endpoint remains unclear.
Capabilities
Use cases
- —Retrieving Stripe invoice data via a single micropayment without needing an API key
- —Programmatic access to invoice information settled on-chain in USDC
- —Agent-driven workflows that need to fetch invoice details with instant crypto payment
Fit
Best for
- —Developers wanting keyless, pay-per-use access to invoice data
- —AI agents that can settle x402 payments on Base
- —Users who prefer on-chain micropayments over subscription billing
Not for
- —Bulk invoice retrieval requiring thousands of calls (no documented batch endpoint)
- —Users who need detailed Stripe dashboard features or webhook integrations
- —Anyone without a Base-compatible USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/stripe/invoices/23 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI schema, no example request/response, and the specific /stripe/invoices/23 route is not documented anywhere on the site. The docs, pricing, and README pages all returned only a 'Connect wallet' prompt with no useful content.
Warnings
- —The /stripe/invoices/23 endpoint is not listed or documented on the provider's landing page — its actual functionality is unknown.
- —All documentation pages (docs, pricing, README, api) returned only 'Connect wallet' with no substantive content.
- —No OpenAPI spec, no example responses, and no request schema are available.
- —The endpoint path references a hardcoded invoice ID (23), suggesting it may be a single-resource endpoint rather than a general-purpose API.
Citations
- —The platform advertises $0.02 per request with no API keys, no rate limits, and instant access on the Base network.https://lowpaymentfee.com
- —The x402 challenge returns maxAmountRequired of 20000 base units in USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, equaling $0.02.https://lowpaymentfee.com/api/v1/stripe/invoices/23
- —The site lists APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories.https://lowpaymentfee.com