x402-gated Stripe invoice endpoint on Base, paid per-call in USDC.
What it does
This endpoint at lowpaymentfee.com provides "Premium API Access" behind an x402 payment wall. The specific resource `/api/v1/stripe/invoices/16` appears to be part of a broader platform that offers dozens of pay-per-call APIs spanning data analytics, AI/ML inference, finance/Web3 data, and utility services. All endpoints on the platform use the x402 protocol and settle payments in USDC on the Base network.
The x402 challenge for this particular endpoint advertises a maximum cost of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 per request — consistent with the site's uniform $0.02/request pricing. Payment is made via the "exact" scheme to wallet 0x1A2B…85F3 with a 300-second timeout. The endpoint accepts HTTP POST requests and returns application/json.
The platform advertises no API keys, no rate limits, and instant access. However, documentation pages (/docs, /pricing, /api, /README) all returned only a "Connect wallet" prompt with no substantive content, so the actual request/response schemas for this invoice endpoint are unknown. It is unclear what data or functionality the `/stripe/invoices/16` resource specifically returns — the name suggests it may relate to Stripe invoice data, but no documentation confirms this.
Capabilities
Use cases
- —Retrieving Stripe invoice data via a pay-per-call model without API keys
- —Programmatic access to invoice information settled in USDC on Base
- —Agent-driven invoice lookups with x402 micropayments
Fit
Best for
- —Developers wanting keyless, pay-per-request API access
- —Agents that can settle x402 payments in USDC on Base
- —Use cases requiring low-cost per-call pricing ($0.02/request)
Not for
- —Users who need detailed API documentation or request/response schemas before integrating
- —High-volume use cases where subscription pricing would be more economical
Quick start
# The endpoint requires an x402 payment header (USDC on Base, $0.02/call)
curl -X POST https://lowpaymentfee.com/api/v1/stripe/invoices/16 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402_payment_token>"Endpoint
Quality
The x402 challenge is live and pricing is clear ($0.02 USDC on Base), but there is zero documentation on what this endpoint actually accepts or returns. All doc pages show only 'Connect wallet' with no content. The specific purpose of /stripe/invoices/16 is opaque.
Warnings
- —No request or response schema available — the endpoint's actual functionality is undocumented
- —All documentation pages (/docs, /pricing, /api, /README) returned only 'Connect wallet' with no substantive content
- —The specific resource '/api/v1/stripe/invoices/16' purpose is unclear — it may be a demo or placeholder
- —Cannot verify what data the endpoint returns without making a paid request
Citations
- —The x402 challenge advertises maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base networkhttps://lowpaymentfee.com/api/v1/stripe/invoices/16
- —The platform advertises uniform $0.02/request pricing with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —The platform offers APIs across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com
- —Documentation pages returned only 'Connect wallet' with no substantive contenthttps://lowpaymentfee.com/docs