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 #137) behind an x402 paywall. It is part of a broader platform offering pay-per-request APIs across data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities — all priced at $0.02 per call, settled in USDC on the Base network.
The specific endpoint `/api/v1/stripe/invoices/137` is labeled "Premium API Access" and accepts POST requests. Payment is handled via the x402 protocol: callers receive a 402 challenge containing the USDC asset address on Base (0x8335…2913), a payTo wallet, and a maxAmountRequired of 20,000 base units (i.e., $0.02 given USDC's 6 decimals). No API keys or rate limits are advertised; access is granted per-payment with a 300-second timeout window.
The platform's landing page lists additional endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, geocoding, validation, and more — all at the same $0.02 price point. However, documentation pages (/docs, /api, /pricing, /README) returned only a "Connect wallet" prompt with no substantive content, so the actual request/response schemas for this invoice endpoint are unknown. The exact data returned by this specific Stripe invoices endpoint is not documented.
Capabilities
Use cases
- —Retrieving Stripe invoice data via a single micropayment without API key registration
- —Programmatic access to invoice #137 details for automated billing workflows
- —Agent-driven payment-gated API consumption on Base L2
Fit
Best for
- —Developers wanting keyless, pay-per-use API access settled in USDC on Base
- —AI agents that can handle x402 payment challenges natively
- —Users needing quick one-off access to a Stripe invoice resource without subscription
Not for
- —Bulk invoice retrieval requiring batch endpoints or pagination
- —Users who need detailed API documentation and request/response schemas before integrating
- —Anyone without USDC on Base network
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/stripe/invoices/137
# Returns 402 with x402 challenge. Supply X-PAYMENT header with valid USDC payment proof on Base to access.Endpoint
Quality
The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base). However, there is no documentation of request parameters, response schema, or what data the Stripe invoices endpoint actually returns. All doc pages are empty stubs showing only 'Connect wallet'.
Warnings
- —No API documentation available — /docs, /api, /pricing, and /README pages all return only a 'Connect wallet' prompt with no content.
- —The request body schema and response format for this endpoint are completely undocumented.
- —It is unclear what data 'Premium API Access' for Stripe invoice #137 actually returns — the endpoint name is generic.
- —The platform appears to be a demo or early-stage project; many listed endpoints may not be fully functional.
Citations
- —The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units in USDC on Base networkhttps://lowpaymentfee.com/api/v1/stripe/invoices/137
- —All APIs are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —The USDC asset address on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/stripe/invoices/137
- —Documentation pages (/docs, /api, /pricing, /README) show only 'Connect wallet' with no substantive contenthttps://lowpaymentfee.com/docs