x402-gated Stripe invoice endpoint on Base, paying $0.02 in USDC per request.
What it does
This endpoint at lowpaymentfee.com provides "Premium API Access" behind an x402 payment wall. It is part of a broader platform that offers a variety of pay-per-request APIs spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities — all priced at $0.02 per call, settled in USDC on the Base network.
The specific endpoint `/api/v1/stripe/invoices/39` appears to be a Stripe invoice-related resource. The x402 challenge confirms it is live, accepts POST requests, and requires an exact payment of 20,000 base units of USDC (0x8335…0913 on Base), which equals $0.02 USD (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 via the x402 payment header.
Documentation is extremely sparse. The docs, API, pricing, and README pages all render only a "Connect wallet" prompt with no substantive content. There is no OpenAPI schema, no request/response examples, and no detailed description of what this specific invoice endpoint returns or what input it expects beyond a POST body. The platform's landing page lists many endpoints but provides no per-endpoint documentation. The actual behavior and response format of this endpoint must be discovered empirically.
Capabilities
Use cases
- —Programmatically accessing Stripe invoice data via a crypto-payment-gated endpoint
- —Integrating pay-per-request invoice retrieval into an agent workflow without API key management
- —Demonstrating x402 protocol usage for micropayment-gated API access
Fit
Best for
- —Developers experimenting with x402 payment protocol on Base
- —Agents that need keyless, pay-per-call API access settled in USDC
- —Projects requiring Stripe invoice data without traditional subscription billing
Not for
- —Users who need detailed API documentation or guaranteed SLAs before integrating
- —High-volume invoice processing where $0.02 per call adds up significantly
- —Anyone without a Base-network USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/stripe/invoices/39 \
-H "X-PAYMENT: <x402-payment-token>" \
-H "Content-Type: application/json"Endpoint
Quality
The endpoint is confirmed live via a valid x402 402 challenge, and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI schema, no request/response examples, and all documentation pages return only a wallet-connect prompt. The purpose of this specific Stripe invoice endpoint is unclear beyond its title. This is effectively a stub listing.
Warnings
- —No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet' with no content.
- —No OpenAPI or schema describing request body or response format for this endpoint.
- —The specific purpose and output of /api/v1/stripe/invoices/39 is undocumented and must be discovered empirically.
- —The endpoint path references a specific invoice ID (39), which may be a demo or placeholder resource.
Citations
- —The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Basehttps://lowpaymentfee.com/api/v1/stripe/invoices/39
- —All APIs on the platform are priced at $0.02 per request 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/39