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 132) behind an x402 payment wall. The site advertises itself as a collection of pay-per-call APIs spanning data analytics, AI/ML inference, finance/Web3, and infrastructure utilities, all priced at $0.02 per request and settled in USDC on the Base network. No API keys, rate limits, or upfront commitments are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof.
The specific endpoint `/api/v1/stripe/invoices/132` is listed under the title "Premium API Access." Its x402 challenge confirms it accepts an exact-scheme payment of up to 20,000 base units of USDC (0x8335…on Base), which equals $0.02 given USDC's 6 decimals. The payment is directed to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout. The endpoint expects HTTP POST and returns application/json.
Documentation beyond the landing page is extremely thin — the /docs, /api, /pricing, and /README pages all render only a "Connect wallet" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema, and no example payloads available. The actual data returned by this invoice endpoint is unknown; it may return Stripe invoice details or some other structured payload. Prospective callers should be aware of this documentation gap.
Capabilities
Use cases
- —Retrieving Stripe invoice data programmatically via a single micropayment
- —Demonstrating x402 payment protocol integration with USDC on Base
- —Agent-driven invoice lookup without pre-registration or API keys
Fit
Best for
- —Developers experimenting with x402 payment-gated APIs
- —Agents that need one-shot invoice data without account setup
- —Low-volume callers who prefer pay-per-request over subscriptions
Not for
- —High-volume invoice processing where per-call fees add up
- —Users who need detailed API documentation or guaranteed SLAs
- —Anyone without a Base-compatible USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/stripe/invoices/132 \
-H "X-PAYMENT: <x402-payment-proof>" \
-H "Content-Type: application/json"Endpoint
Quality
The endpoint is live and returns a valid x402 challenge with clear pricing ($0.02 USDC on Base). However, there is no OpenAPI spec, no request/response schema, no example payloads, and all documentation pages beyond the landing page are empty wallet-connect stubs. The purpose of this specific invoice endpoint is unclear.
Warnings
- —No OpenAPI or schema documentation available — request and response formats are unknown
- —All doc/pricing/README pages render only 'Connect wallet' with no content
- —The specific data returned by /api/v1/stripe/invoices/132 is undocumented
- —The endpoint name 'Premium API Access' is generic and does not describe its function
Citations
- —The site lists all APIs at $0.02 per request with no API keys, no rate limits, and instant access on the Base network.https://lowpaymentfee.com
- —The x402 challenge specifies maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base with a 300-second timeout.https://lowpaymentfee.com/api/v1/stripe/invoices/132
- —Documentation pages (/docs, /api, /pricing, /README) contain only a 'Connect wallet' prompt with no further content.https://lowpaymentfee.com/docs