x402-gated Stripe invoice endpoint on Base, paying $0.02 in USDC per request.
What it does
This endpoint at lowpaymentfee.com provides access to a Stripe invoice resource (invoice #14) behind an x402 paywall. It is part of a broader platform that offers dozens of pay-per-call API endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and utility services — all priced at $0.02 per request, settled in USDC on the Base network.
The specific endpoint `/api/v1/stripe/invoices/14` is labeled "Premium API Access" and accepts POST requests. Payment is handled via the x402 protocol: callers receive a 402 challenge containing the payment parameters (asset, amount, payTo address) and must include a valid X-PAYMENT header to proceed. The max amount required is 20,000 base units of USDC (6 decimals), which equals $0.02. The payment is routed to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` on Base mainnet.
Documentation is extremely sparse — the docs, pricing, API, and README pages all render only a "Connect wallet" prompt with no substantive content. There is no OpenAPI schema, no request/response examples, and no description of what data this particular invoice endpoint actually returns. The platform advertises no API keys, no rate limits, and instant access, but the actual behavior and response format of this specific endpoint remain undocumented.
Capabilities
Use cases
- —Retrieving Stripe invoice data via a pay-per-call model without API key management
- —Programmatic access to invoice #14 for automated billing or reconciliation workflows
- —Demonstrating x402 protocol integration for USDC micropayments on Base
Fit
Best for
- —Developers experimenting with x402 payment protocol
- —Agents that need keyless, pay-per-call API access on Base
- —Use cases requiring low-friction micropayment-gated endpoints
Not for
- —Production workflows requiring documented request/response schemas
- —Users who need bulk or subscription-based invoice access at lower per-call cost
- —Anyone needing detailed Stripe invoice management (create, update, delete)
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/stripe/invoices/14 \
-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), but there is no documentation, no OpenAPI schema, no request/response examples, and the docs pages are empty. The purpose of this specific invoice endpoint is unclear beyond its label.
Warnings
- —No documentation available — docs, pricing, API, and README pages all show only 'Connect wallet'
- —No OpenAPI or request/response schema provided; actual response format is unknown
- —The specific purpose of '/api/v1/stripe/invoices/14' (a hardcoded invoice ID) is unclear
- —No information on what data is returned or what POST body is expected
Citations
- —The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Basehttps://lowpaymentfee.com/api/v1/stripe/invoices/14
- —All endpoints on the platform are priced at $0.02 per request with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —The USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/stripe/invoices/14