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 ID 89) behind an x402 paywall. It is part of a broader platform that offers a variety of pay-per-request APIs spanning data analytics, AI/ML inference, finance/Web3 data, and utility services — all priced at $0.02 per call, settled in USDC on the Base network.
The specific endpoint `/api/v1/stripe/invoices/89` accepts POST requests and returns `application/json`. Payment is handled via the x402 protocol: callers must include an `X-PAYMENT` header with a valid payment proof. The challenge advertises a max amount of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The payment is sent to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` with a 300-second timeout.
The platform advertises no API keys, no rate limits, and instant access. However, documentation beyond the landing page is extremely thin — the docs, API, pricing, 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 detailed description of what this particular invoice endpoint returns or what input it expects. The endpoint is confirmed live (402 challenge captured), but the lack of documentation makes it difficult to use without experimentation.
Capabilities
Use cases
- —Retrieving Stripe invoice data via a crypto-settled pay-per-request model
- —Programmatic access to invoice #89 without traditional API key authentication
- —Agent-driven invoice lookups settled in USDC on Base
Fit
Best for
- —Developers wanting keyless, pay-per-use API access settled on-chain
- —Agents that can handle x402 payment challenges natively
- —Users who prefer USDC micropayments over subscription billing
Not for
- —Users needing detailed API documentation or OpenAPI specs before integrating
- —High-volume invoice retrieval where per-call pricing adds up
- —Anyone without a Base-compatible USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/stripe/invoices/89
# Returns 402 with x402 challenge; include X-PAYMENT header with valid payment proof to access.Endpoint
Quality
The endpoint is confirmed live with a valid x402 402 challenge, but documentation is essentially nonexistent — docs/pricing/API pages all show only 'Connect wallet'. No OpenAPI schema, no request/response examples, and no description of what the invoice endpoint actually returns. The purpose of this specific endpoint (Stripe invoice #89) is unclear.
Warnings
- —Documentation pages (docs, pricing, API, README) contain no substantive content — only a 'Connect wallet' prompt
- —No OpenAPI or schema available; request body format and response structure are unknown
- —The endpoint references a specific Stripe invoice ID (89) — unclear if this is a demo or a real resource
- —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/89
- —Platform advertises $0.02 per request, no API keys, no rate limits, instant access, Base networkhttps://lowpaymentfee.com
- —USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/stripe/invoices/89