x402-gated Stripe invoice endpoint on Base, pay-per-call with USDC.
What it does
This endpoint at lowpaymentfee.com provides "Premium API Access" behind an x402 payment challenge. It is part of a broader platform offering pay-per-request APIs across data analytics, AI/ML inference, finance/Web3, and infrastructure utilities — all settled on the Base network using USDC via the x402 protocol.
The specific endpoint `/api/v1/stripe/invoices/186` appears to be a Stripe invoice-related resource. The x402 challenge indicates a maximum cost of 20,000 base units of USDC (0x8335… on Base), which equals $0.02 per request (USDC uses 6 decimals). The payment scheme is "exact" with a 300-second timeout. The endpoint accepts POST requests and returns application/json.
The platform advertises a simple pricing model of $0.02 per request with no API keys, no rate limits, no minimums, and instant access. Documentation pages (docs, pricing, README) were largely empty beyond a "Connect wallet" prompt, so detailed request/response schemas and usage examples are not available from the crawl. The endpoint is confirmed live — it returned a proper 402 challenge during probing.
Capabilities
Use cases
- —Programmatically accessing Stripe invoice data via a pay-per-call model
- —Integrating invoice retrieval into agent workflows without API key management
- —Paying for API access with USDC on Base without subscriptions
Fit
Best for
- —Agents or developers who want keyless, pay-per-use API access
- —Users who prefer crypto-native (USDC on Base) payment for API calls
- —Low-volume or sporadic usage where per-request billing is more economical
Not for
- —High-volume users who need bulk pricing or subscription discounts
- —Users who need detailed API documentation and request/response schemas upfront
- —Anyone unable to settle payments in USDC on the Base network
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/stripe/invoices/186 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is live and returns a valid x402 challenge, but documentation is essentially absent — docs, pricing, and README pages only show 'Connect wallet'. No request/response schema, no usage examples, and the specific purpose of the '/stripe/invoices/186' resource is unclear. The listing is effectively a stub with confirmed liveness.
Warnings
- —Documentation pages (docs, pricing, README) are empty beyond a wallet-connect prompt
- —No request body schema or response schema available — unclear what data to POST or what is returned
- —The endpoint path references a specific invoice ID (186), which may be a demo or placeholder resource
- —The generic 'Premium API Access' description does not clarify what this endpoint actually does
Citations
- —The platform charges $0.02 per request with no API keys, no rate limits, and no minimumshttps://lowpaymentfee.com
- —The x402 challenge specifies maxAmountRequired of 20000 base units of USDC on Base with a 300-second timeouthttps://lowpaymentfee.com/api/v1/stripe/invoices/186
- —USDC contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/stripe/invoices/186