Pay-per-call premium API access on Base network via x402, $0.02/request in USDC.
What it does
This endpoint at lowpaymentfee.com provides "Premium API Access" via the x402 payment protocol. The site offers a collection of APIs spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities — all priced at $0.02 per request, paid in USDC on the Base network with no API keys, rate limits, or commitments required.
The specific endpoint `/api/resource/15` is one of potentially many resources on the platform. The x402 challenge confirms it accepts exact-scheme payments of up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. Payments are sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout. The endpoint accepts POST requests and returns application/json.
Documentation is extremely sparse — the docs, pricing, and API pages all render only a "Connect wallet" prompt with no further technical detail. The site's landing page lists various API paths (analytics, AI, finance, utilities) but provides no request/response schemas, parameter descriptions, or example payloads. It is unclear what data or functionality `/api/resource/15` specifically returns.
Capabilities
Use cases
- —Accessing premium data or AI endpoints without traditional API key registration
- —Making one-off API calls paid per-request via USDC on Base
- —Integrating pay-as-you-go API services into crypto-native applications
Fit
Best for
- —Developers wanting keyless, pay-per-call API access
- —Crypto-native agents that can settle USDC on Base
- —Low-volume or sporadic API consumers who prefer no subscriptions
Not for
- —Users without USDC on Base network
- —High-volume consumers needing bulk pricing or SLAs
- —Developers requiring detailed API documentation and schemas before integration
Quick start
# Send a POST with x402 payment header to access the resource
curl -X POST https://lowpaymentfee.com/api/resource/15 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no request/response schema, and no indication of what /api/resource/15 actually returns. Effectively a stub listing.
Warnings
- —No API documentation available — docs/pricing/API pages only show 'Connect wallet'
- —No request or response schema provided for /api/resource/15
- —Unclear what specific data or functionality this endpoint delivers
- —No OpenAPI spec or examples available
Citations
- —The endpoint returns a 402 challenge accepting USDC on Base with maxAmountRequired of 20000 base units ($0.02)https://lowpaymentfee.com/api/resource/15
- —All APIs are priced at $0.02/request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —The site lists APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com