x402-gated Stripe invoice endpoint on Base, paid per-call in USDC.
What it does
This endpoint at lowpaymentfee.com provides "Premium API Access" behind an x402 payment wall. The specific resource `/api/v1/stripe/invoices/55` appears to be a Stripe invoice-related API call, though the exact functionality (e.g., fetching invoice details, creating invoices) is not documented beyond the generic title. Payment is settled on the Base network using USDC (contract 0x8335…2913) via the x402 "exact" scheme.
The provider's landing page advertises a broad catalog of pay-per-call APIs spanning data/analytics, AI/ML (sentiment, summarization, classification, embeddings), finance/Web3 (price feeds, exchange rates, gas estimates), and infrastructure utilities (geocoding, validation, conversion). Most listed endpoints are priced at $0.02 per request. However, this particular endpoint (`/api/v1/stripe/invoices/55`) is not among those listed on the homepage and carries a different price: the x402 challenge specifies a maxAmountRequired of 20,000 base units of USDC (6 decimals), which equals $0.02 — consistent with the site-wide pricing.
Documentation is extremely sparse. The /docs, /api, /pricing, and /README pages all render only a "Connect wallet" prompt with no substantive content. There is no OpenAPI spec, no request/response schema, and no usage examples. The endpoint is confirmed live (returns a proper 402 challenge), but without documentation it is unclear what request body is expected or what the response payload looks like.
Capabilities
Use cases
- —Programmatically accessing Stripe invoice data via a pay-per-call model without API keys
- —Agent-driven invoice retrieval settled in USDC on Base
- —Integrating invoice lookups into automated financial workflows
Fit
Best for
- —Developers wanting keyless, pay-per-call access to invoice data
- —AI agents that can settle x402 payments on Base in USDC
- —Users who prefer crypto micropayments over subscription billing
Not for
- —Users needing detailed API documentation or request/response schemas before integrating
- —High-volume invoice processing where per-call pricing adds up
- —Anyone requiring non-crypto payment methods
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/stripe/invoices/55 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is live and returns a valid x402 challenge, but there is zero documentation on request format, response schema, or what the endpoint actually does beyond the generic 'Premium API Access' label. No OpenAPI spec, no examples, and all doc pages are blank wallet-connect screens.
Warnings
- —No documentation available — /docs, /api, /pricing, and /README all show only 'Connect wallet' with no content
- —No request or response schema provided; unclear what POST body is expected
- —The specific endpoint /api/v1/stripe/invoices/55 is not listed among the provider's advertised APIs on the homepage
- —The hardcoded '55' in the path suggests this may be a single fixed resource rather than a parameterized endpoint
Citations
- —The x402 challenge specifies maxAmountRequired of 20000 base units of USDC on Base networkhttps://lowpaymentfee.com/api/v1/stripe/invoices/55
- —The provider advertises $0.02 per request pricing with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/stripe/invoices/55
- —Documentation pages (/docs, /api, /pricing, /README) render only a 'Connect wallet' prompthttps://lowpaymentfee.com/docs