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 90) behind an x402 paywall. It is part of a broader platform that offers dozens of pay-per-request API endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and utility services — all gated via the x402 protocol on the Base network, settled in USDC.
The specific endpoint `/api/v1/stripe/invoices/90` accepts POST requests and returns `application/json`. The x402 challenge advertises a maximum cost of 20,000 base units of USDC (0x8335… on Base), which equals $0.02 per request (USDC uses 6 decimals). The platform's landing page confirms a flat $0.02/request pricing model across all endpoints, with no API keys, no rate limits, and no minimum commitments required.
Documentation is extremely sparse — the /docs, /pricing, /api, and /README pages all render only a "Connect wallet" prompt with no substantive content. There is no OpenAPI spec, no request/response schema documentation, and no usage examples. The exact purpose of the "Stripe invoices" resource and what data it returns are not documented. The endpoint is confirmed live via a valid 402 challenge response.
Capabilities
Use cases
- —Retrieving Stripe invoice data via a single micropayment without needing an API key
- —Programmatic access to invoice records settled on-chain in USDC
- —Agent-driven invoice lookups where per-call billing is preferred over subscriptions
Fit
Best for
- —Agents or services that need one-off invoice data without subscription overhead
- —Developers experimenting with x402 payment flows on Base
- —Use cases requiring keyless, pay-as-you-go API access
Not for
- —High-volume invoice processing where per-call costs add up quickly
- —Users who need detailed API documentation or guaranteed SLAs
- —Anyone requiring non-USDC or non-Base settlement options
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/stripe/invoices/90 \
-H "X-PAYMENT: <x402-payment-token>" \
-H "Content-Type: application/json"Endpoint
Quality
The endpoint is live (valid 402 challenge captured) and pricing is clear ($0.02/request in USDC on Base). However, there is no documentation, no OpenAPI spec, no request/response schema, and no examples. The purpose of the specific 'stripe/invoices/90' resource is undocumented, making this effectively a stub listing.
Warnings
- —No API documentation available — /docs, /pricing, /api, and /README pages all show only 'Connect wallet' with no content.
- —No OpenAPI or request/response schema provided; request body format and response structure are unknown.
- —The specific purpose and data returned by /api/v1/stripe/invoices/90 are not documented anywhere in the crawl material.
- —The endpoint path references a hardcoded invoice ID (90), which may indicate a demo or placeholder resource.
Citations
- —The x402 challenge advertises maxAmountRequired of 20000 base units of USDC on Base networkhttps://lowpaymentfee.com/api/v1/stripe/invoices/90
- —Platform pricing is $0.02 per request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/stripe/invoices/90