x402-gated Stripe invoice endpoint on Base, pay-per-call with USDC.
What it does
This endpoint at lowpaymentfee.com provides a Stripe invoice resource behind an x402 paywall. When called via POST at `/api/v1/stripe/invoices/80`, it returns a 402 challenge requiring payment in USDC on the Base network. The maximum amount required is 20,000 base units of USDC (6 decimals), which equals $0.02 per request.
The broader lowpaymentfee.com platform advertises a suite of pay-per-call APIs spanning data & analytics (metrics, reports, data export, insights), AI & machine learning (sentiment analysis, text summarization, classification, embeddings), finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are listed at $0.02 per request, settled in USDC on Base via the x402 protocol. The platform claims no API keys, no rate limits, no minimums, and instant access.
The specific endpoint being listed here (`/api/v1/stripe/invoices/80`) appears to be a Stripe invoice-related resource, but there is no documentation explaining what data it returns or what input it expects beyond a POST request. The docs, pricing, API, and README pages all returned only a "Connect wallet" prompt with no substantive content. Without schema details or example responses, the actual functionality of this particular endpoint remains unclear.
Capabilities
Use cases
- —Retrieving or generating Stripe invoice data via a single paid API call
- —Programmatic access to invoice resources without API key management
- —Agent-driven invoice lookups settled in USDC on Base
Fit
Best for
- —Developers who want keyless, pay-per-call access to invoice data
- —AI agents that can settle x402 payments in USDC on Base
- —Users who prefer crypto micropayments over subscription billing
Not for
- —Users who need detailed API documentation before integrating
- —High-volume use cases where per-call pricing may add up
- —Anyone requiring non-crypto payment methods
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/stripe/invoices/80
# Returns 402 with x402 challenge; attach X-PAYMENT header with USDC payment proof on Base to access.Endpoint
Quality
The endpoint is live and returns a valid x402 challenge with clear pricing ($0.02 USDC on Base). However, there is no documentation, no OpenAPI schema, no example request/response, and the docs pages are empty stubs. The purpose of this specific invoice endpoint is unclear beyond its URL path.
Warnings
- —No API documentation available — docs, pricing, API, and README pages all return only a wallet-connect prompt with no content.
- —No request or response schema provided; the actual data returned by this endpoint is unknown.
- —The endpoint path suggests Stripe invoice data but no confirmation of what is returned exists in the crawl material.
- —The platform lists many endpoints but none have documented schemas or examples.
Citations
- —The endpoint returns a 402 challenge requiring USDC payment on Base network with maxAmountRequired of 20000 base unitshttps://lowpaymentfee.com/api/v1/stripe/invoices/80
- —USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/stripe/invoices/80
- —All endpoints 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