x402-gated Stripe invoice endpoint on Base, pay-per-call with USDC.
What it does
This endpoint at lowpaymentfee.com provides a Stripe invoice-related API behind an x402 payment wall. The specific resource path `/api/v1/stripe/invoices/200` suggests it returns or generates Stripe invoice data. Payment is settled on the Base network using USDC (contract 0x8335…2913) via the x402 "exact" scheme. The maximum amount required per call is 20,000 base units of USDC, which at 6 decimals equals $0.02 per request.
The provider hosts a broader platform offering multiple pay-per-call API categories including Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure utilities — all priced at $0.02 per request. The platform advertises no API keys, no rate limits, and instant access. However, documentation pages (docs, pricing, README) all returned only a "Connect wallet" prompt with no substantive content, so the actual request/response schema for this specific endpoint is unknown.
The endpoint is confirmed live: it returns a proper x402 version-1 challenge with a 402 status code when called via POST without payment. The input method is HTTP POST and the output MIME type is application/json. Beyond that, there is no OpenAPI spec, no request body schema, and no example responses available from the crawled material.
Capabilities
Use cases
- —Retrieving or generating Stripe invoice data without traditional API key authentication
- —Programmatic invoice access settled via on-chain USDC micropayments
- —Agent-driven invoice lookups where pay-per-call is preferred over subscriptions
Fit
Best for
- —Developers wanting keyless, pay-per-call access to Stripe invoice data
- —AI agents that can settle x402 payments on Base
- —Users who prefer on-chain micropayments over subscription billing
Not for
- —Users needing detailed API documentation or request/response schemas before integrating
- —High-volume invoice processing where per-call fees add up
- —Users without a Base-compatible USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/stripe/invoices/200 \
-H "Content-Type: application/json"
# Returns 402 with x402 challenge; attach X-PAYMENT header with signed USDC payment to access.Endpoint
Quality
The endpoint is confirmed live with a valid x402 challenge, but there is no OpenAPI spec, no request/response schema, and all documentation pages are empty (just 'Connect wallet'). The purpose of the specific '/stripe/invoices/200' path is unclear — it could be a demo or a real Stripe integration. Pricing is clear ($0.02/call) but functional details are almost entirely missing.
Warnings
- —No API documentation available — all doc pages return only 'Connect wallet' with no content
- —No request body schema or response schema provided; callers cannot know what to send or expect
- —The endpoint path '/api/v1/stripe/invoices/200' is ambiguous — unclear if '200' is an invoice ID, a status code filter, or something else
- —No OpenAPI or ai-plugin manifest found
- —No robots.txt or agents.txt present
Citations
- —The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Basehttps://lowpaymentfee.com/api/v1/stripe/invoices/200
- —USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/stripe/invoices/200
- —All APIs on the platform are priced at $0.02 per request with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —The platform offers APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com