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. The specific resource `/api/v1/stripe/invoices/37` appears to be a Stripe invoice-related API endpoint. It accepts POST requests and is gated by an x402 challenge requiring payment in USDC on the Base network.
The endpoint charges a maximum of 0.02 USDC per request (20,000 base units of USDC with 6 decimals). Payment is made to the on-chain address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using the USDC contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913` on Base. The x402 challenge uses the "exact" payment scheme with a 300-second timeout.
The broader lowpaymentfee.com platform advertises a suite of APIs across data/analytics, AI/ML, finance/Web3, and infrastructure categories, all priced at $0.02 per request with no API keys, no rate limits, and instant access. However, the crawled documentation pages (docs, pricing, README) returned only "Connect wallet" with no substantive content, so the actual behavior and response format of this specific invoice endpoint remain unclear. There is no OpenAPI schema, no example responses, and no detailed documentation available from the crawl.
Capabilities
Use cases
- —Programmatically accessing Stripe invoice data via a pay-per-call model
- —Agent-driven invoice retrieval without API key management
- —On-chain micropayment-gated access to financial data
Fit
Best for
- —Agents that need Stripe invoice access without traditional API key provisioning
- —Developers wanting pay-as-you-go access to invoice endpoints
- —Crypto-native workflows settling per-request payments on Base
Not for
- —Users needing detailed API documentation or response schema guarantees before integrating
- —High-volume invoice processing where $0.02/request adds up significantly
- —Anyone requiring non-crypto payment methods
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/stripe/invoices/37 \
-H "X-PAYMENT: <x402-payment-header>" \
-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, no OpenAPI schema, no example request/response, and the docs/pricing/README pages are all empty stubs showing only 'Connect wallet'. The purpose and response format of this specific Stripe invoices endpoint are entirely unclear.
Warnings
- —No OpenAPI schema or detailed documentation available
- —All documentation pages (docs, pricing, README) returned only 'Connect wallet' with no content
- —The specific behavior and response format of /api/v1/stripe/invoices/37 is unknown
- —No example requests or responses are available to verify functionality
- —The endpoint path references a specific invoice ID (37), which may be a demo or placeholder
Citations
- —Endpoint returns x402 challenge with maxAmountRequired of 20000 base units USDC on Basehttps://lowpaymentfee.com/api/v1/stripe/invoices/37
- —Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/stripe/invoices/37
- —Payment timeout is 300 seconds using exact payment schemehttps://lowpaymentfee.com/api/v1/stripe/invoices/37