x402-gated Stripe invoice endpoint on Base, pay $0.02 per request in USDC.
What it does
This endpoint at lowpaymentfee.com provides "Premium API Access" via the x402 payment protocol. It is part of a broader platform offering pay-per-request APIs across categories including data analytics, AI/ML inference, finance/Web3, and infrastructure utilities. The specific endpoint `/api/v1/stripe/invoices/41` appears to be a Stripe invoice-related resource, though the exact response payload is not documented.
Payment is settled on the Base network using USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) at a cost of $0.02 per request (20,000 base units with 6 decimals). The platform advertises no API keys, no rate limits, and instant access — callers simply attach an X-PAYMENT header with a valid x402 payment proof. The endpoint accepts POST requests and returns application/json.
Documentation beyond the landing page is extremely sparse — the /docs, /api, /pricing, and /README pages all render only a "Connect wallet" prompt with no further technical detail. There is no OpenAPI schema, no example request/response bodies, and no description of what data the invoice endpoint actually returns.
Capabilities
Use cases
- —Programmatically retrieving Stripe invoice data without traditional API key management
- —Agent-driven payment workflows where per-call USDC settlement is preferred
- —Integrating invoice lookups into crypto-native applications
Fit
Best for
- —Developers wanting keyless, pay-per-request access to invoice data
- —AI agents with x402-compatible wallets on Base
- —Crypto-native applications needing low-friction API access
Not for
- —Users needing detailed API documentation or guaranteed SLAs
- —High-volume batch invoice processing where per-call fees add up
- —Anyone without a Base-network USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/stripe/invoices/41 \
-H "X-PAYMENT: <x402_payment_proof>" \
-H "Content-Type: application/json"Endpoint
Quality
The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is no documentation of request parameters, response schema, or what the endpoint actually returns. All detail pages render only 'Connect wallet' with no content.
Warnings
- —No documentation available — /docs, /api, /pricing, /README all show only 'Connect wallet'
- —No OpenAPI schema or example responses provided
- —Exact purpose of '/api/v1/stripe/invoices/41' is unclear — could be a demo or placeholder
- —No information on what data is returned in the response body
Citations
- —Endpoint returns 402 with x402 challenge advertising USDC on Base network at 20000 base unitshttps://lowpaymentfee.com/api/v1/stripe/invoices/41
- —Platform advertises $0.02/request pricing with no API keys, no rate limits, instant access on Base networkhttps://lowpaymentfee.com
- —USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/stripe/invoices/41