Pay-per-call premium API endpoint on Base via x402, settled in USDC.
What it does
lowpaymentfee.com hosts a collection of pay-per-request API endpoints accessible via the x402 payment protocol on the Base network. This specific endpoint (`/api/endpoint-6`) is listed as "Premium API Access" and accepts USDC payments on Base. The x402 challenge confirms the endpoint is live and requires a maximum of 20,000 base units of USDC (i.e., $0.02 per request, since USDC uses 6 decimals). Payment is made inline via the X-PAYMENT header with no API keys or rate limits required.
The broader lowpaymentfee.com platform advertises endpoints across several categories: Data & Analytics (metrics, reports, data export, insights), AI & Machine Learning (sentiment analysis, text summarization, classification, embeddings), Finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and Infrastructure (geocoding, validation, conversion, generation). All endpoints are priced at $0.02 per request. However, this particular endpoint (`/api/endpoint-6`) does not map to any of the named endpoints on the site, so its exact functionality is unclear.
The endpoint accepts POST requests and returns `application/json`. Settlement occurs on the Base L2 network to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using the USDC contract at `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`. No OpenAPI schema, detailed documentation, or example payloads were found during the crawl — the docs, pricing, and API pages all returned only a "Connect wallet" prompt with no further content.
Capabilities
Use cases
- —Programmatic access to a premium API endpoint with inline USDC micropayments
- —Agent-driven workflows that need keyless, pay-as-you-go API calls on Base
- —Testing x402 payment protocol integrations against a live endpoint
Fit
Best for
- —Developers experimenting with x402 payment flows
- —AI agents that can settle USDC on Base for per-call API access
- —Users who want no-signup, no-API-key access to paid endpoints
Not for
- —Users who need detailed documentation or guaranteed SLAs before integrating
- —Anyone without a Base-compatible USDC wallet
- —Use cases requiring known, well-documented endpoint behavior (this endpoint's function is unspecified)
Quick start
curl -X POST https://lowpaymentfee.com/api/endpoint-6 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>" \
-d '{}'Endpoint
Quality
The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02/request in USDC on Base), but there is no documentation, no OpenAPI schema, no example request/response, and the specific function of /api/endpoint-6 is unknown. The crawled docs/pricing/API pages returned only 'Connect wallet' with no useful content.
Warnings
- —The endpoint path /api/endpoint-6 does not correspond to any named endpoint on the site; its actual functionality is unknown.
- —No OpenAPI schema, request/response examples, or meaningful documentation is available.
- —Docs, pricing, and API pages returned only 'Connect wallet' with no further content.
- —Cannot verify what data or service this endpoint actually provides.
Citations
- —The x402 challenge returns 402 with maxAmountRequired of 20000 base units of USDC on Basehttps://lowpaymentfee.com/api/endpoint-6
- —All endpoints on the site are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/endpoint-6
- —The site lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com