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 wall. It is part of a broader platform offering dozens of pay-per-request API endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities — all gated via the x402 protocol on the Base network using USDC.
The specific endpoint `/api/v1/stripe/invoices/189` accepts POST requests and returns JSON. 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). Payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout. No API keys or rate limits are advertised; access is granted purely through the x402 payment header.
Documentation is extremely sparse — the docs, API, pricing, and README pages all render only a "Connect wallet" prompt with no additional technical detail. There is no OpenAPI spec, no request/response schema beyond the x402 challenge's outputSchema stub, and no explanation of what data the Stripe invoices endpoint actually returns. The endpoint is live (returns a valid 402 challenge), but the lack of documentation makes it difficult to know what payload to send or what response to expect.
Capabilities
Use cases
- —Retrieving Stripe invoice data via a pay-per-request model without API keys
- —Programmatic access to invoice information settled in USDC on Base
- —Agent-driven invoice lookups with automatic x402 micropayments
Fit
Best for
- —Developers wanting keyless, pay-per-call access to invoice data
- —AI agents that can settle x402 payments on Base
- —Users who prefer crypto micropayments over subscription billing
Not for
- —Anyone needing detailed API documentation or request/response schemas before integrating
- —High-volume invoice processing where per-request fees add up
- —Users without a Base-compatible USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/stripe/invoices/189 \
-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 nonexistent — every doc page just shows 'Connect wallet'. There is no OpenAPI spec, no request/response schema, and no explanation of what the Stripe invoices endpoint actually does or what inputs it expects. Pricing is clear ($0.02/request) but the functional purpose is opaque.
Warnings
- —No documentation available — all doc pages render only 'Connect wallet'
- —No OpenAPI or request/response schema provided
- —The purpose and expected input/output of the /stripe/invoices/189 endpoint is unclear
- —Cannot verify what data is returned without making a paid request
Citations
- —The endpoint returns a valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Basehttps://lowpaymentfee.com/api/v1/stripe/invoices/189
- —The platform advertises $0.02 per request pricing with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —USDC asset address on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/stripe/invoices/189