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/28` appears to be a Stripe invoice-related API call, though the exact functionality (e.g., fetching invoice details, creating invoices) is not documented beyond the generic title. Payment is settled on the Base network using USDC (contract 0x8335…2913) via the x402 "exact" scheme.
The endpoint charges a maximum of 20,000 base units of USDC per request. Since USDC uses 6 decimals, this equals $0.02 per call — consistent with the site-wide pricing of $0.02/request advertised on the landing page. The provider advertises no API keys, no rate limits, and instant access. The x402 challenge was successfully captured with version 1, a 300-second payment timeout, and POST as the expected HTTP method.
lowpaymentfee.com hosts a broader suite of APIs spanning data analytics, AI/ML inference (sentiment, summarization, classification, embeddings), finance/crypto data feeds, and utility services — all at the same $0.02/request price point. However, this specific listing covers only the `/api/v1/stripe/invoices/28` endpoint. Documentation beyond the landing page is effectively empty (all sub-pages just show "Connect wallet"), so the precise request/response schema for this endpoint is unknown.
Capabilities
Use cases
- —Fetching or interacting with Stripe invoice data via a crypto-paid API call
- —Programmatic invoice access without traditional API key provisioning
- —Agent-driven payment workflows where USDC on Base settles per request
Fit
Best for
- —Developers wanting keyless, pay-per-call access to invoice-related functionality
- —AI agents that can settle x402 payments in USDC on Base
- —Users who prefer crypto micropayments over subscription billing
Not for
- —Users needing detailed API documentation or OpenAPI schemas before integrating
- —High-volume invoice processing where $0.02/call adds up significantly
- —Anyone without a Base-compatible USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/stripe/invoices/28 \
-H "X-PAYMENT: <x402-payment-token>" \
-H "Content-Type: application/json"Endpoint
Quality
The x402 challenge is live and pricing is clear ($0.02/request in USDC on Base). However, there is no documentation, no OpenAPI schema, no request/response examples, and the endpoint's actual functionality (what it returns or accepts) is entirely undocumented. All doc pages return only 'Connect wallet'.
Warnings
- —No documentation available — all doc/pricing/API pages show only 'Connect wallet'
- —No request or response schema provided; exact endpoint behavior is unknown
- —The endpoint path references a specific invoice ID (28), which may be a demo or placeholder
- —Purpose of a 'Stripe invoices' endpoint behind crypto payment is unclear — could be a demo site
Citations
- —The x402 challenge returns maxAmountRequired of 20000 base units of USDC on Base networkhttps://lowpaymentfee.com/api/v1/stripe/invoices/28
- —Site-wide pricing is $0.02 per request 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/28