x402-gated Stripe invoice endpoint on Base, paid per-call in USDC.
What it does
This endpoint at lowpaymentfee.com provides access to a Stripe invoice resource (invoice ID 6) behind an x402 paywall. The endpoint accepts POST requests and returns JSON. 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 equals $0.02 USD (USDC uses 6 decimals).
The hosting site lowpaymentfee.com advertises a broad catalog of pay-per-call APIs spanning data analytics, AI/ML inference (sentiment analysis, summarization, classification, embeddings), finance/crypto market data, and utility services—all priced at $0.02 per request with no API keys, no rate limits, and no commitments. However, this specific endpoint (/api/v1/stripe/invoices/6) is not listed among the publicly advertised APIs on the landing page, and its exact response payload is undocumented. The description field in the x402 challenge simply reads "Premium API Access," giving no further detail about what data or functionality is returned.
Because the crawled documentation pages (/docs, /api, /pricing, /README) all returned only a "Connect wallet" prompt with no substantive content, there is no schema documentation, example request/response, or detailed description available for this endpoint. The endpoint is confirmed live (402 challenge captured), but its actual utility remains unclear.
Capabilities
Use cases
- —Retrieving Stripe invoice data without traditional API key authentication
- —Programmatic access to invoice information via crypto micropayment
- —Agent-driven invoice lookup settled in USDC on Base
Fit
Best for
- —Developers wanting keyless, pay-per-call access to invoice data
- —AI agents that can settle x402 payments on Base
- —Users who prefer crypto micropayments over subscription billing
Not for
- —Users needing well-documented API schemas and example responses
- —High-volume invoice retrieval where $0.02/call adds up quickly
- —Anyone requiring non-crypto payment methods
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/stripe/invoices/6
# Returns 402 with x402 challenge; attach 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), but there is zero documentation on the request body, response schema, or what 'Premium API Access' actually returns. All doc pages are empty. The specific invoice endpoint is not listed on the site's own catalog.
Warnings
- —No documentation available — /docs, /api, /pricing, and /README pages all return only a wallet-connect prompt with no content.
- —This specific endpoint (/api/v1/stripe/invoices/6) is not listed among the site's advertised APIs; its purpose is unclear.
- —No request or response schema is provided; the actual data returned is unknown.
- —The endpoint name suggests it returns a single hardcoded Stripe invoice (ID 6), which may have very limited utility.
Citations
- —The x402 challenge requires 20,000 base units of USDC on Base network (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913).https://lowpaymentfee.com/api/v1/stripe/invoices/6
- —The site advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base network.https://lowpaymentfee.com
- —Documentation pages (/docs, /api, /pricing, /README) contain only a 'Connect wallet' prompt with no substantive content.https://lowpaymentfee.com/docs