Pay-per-call premium API on Base via x402 — $0.02/request in USDC, no API keys required.
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-94`) is listed as "Premium API Access" and accepts USDC payments on Base. The x402 challenge confirms the endpoint is live and charges 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 — no API keys, accounts, or rate limits are required.
The broader lowpaymentfee.com platform advertises endpoints across four 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 utilities (geocoding, validation, conversion, generation). All listed endpoints share the same $0.02/request pricing. However, this particular endpoint path (`/api/endpoint-94`) does not correspond to any of the named endpoints on the site's landing page, so its exact functionality is unclear.
The endpoint settles payments to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using USDC at contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913` on Base. The response MIME type is `application/json`. Documentation beyond the landing page is essentially empty (all subpages just show "Connect wallet"), so there is no schema, example request/response, or detailed usage guide available.
Capabilities
Use cases
- —Programmatic access to a premium API endpoint without needing API keys or account signup
- —Agent-driven workflows that pay per call using USDC on Base
- —Testing x402 payment protocol integrations against a low-cost live endpoint
Fit
Best for
- —Developers exploring x402 payment protocol integration
- —AI agents that need keyless, pay-per-use API access
- —Low-cost experimentation with crypto-settled API calls
Not for
- —Users who need detailed documentation or guaranteed SLAs
- —Anyone requiring a known, well-documented API function (the exact capability of /api/endpoint-94 is unspecified)
- —Users without access to USDC on Base
Quick start
curl -X POST https://lowpaymentfee.com/api/endpoint-94 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base). However, the specific endpoint path /api/endpoint-94 is not documented anywhere on the site, there is no OpenAPI schema, no request/response examples, and all documentation pages are empty stubs. The actual functionality behind this endpoint is unknown.
Warnings
- —The endpoint path /api/endpoint-94 does not match any of the named endpoints listed on the provider's landing page — its actual functionality is unknown.
- —All documentation pages (/docs, /api, /pricing, /README) return only 'Connect wallet' with no substantive content.
- —No OpenAPI spec, request schema, or response schema is available.
- —No examples of request or response payloads exist in any crawled material.
Citations
- —The x402 challenge returns maxAmountRequired of 20000 base units of USDC on Base, equating to $0.02 per request.https://lowpaymentfee.com/api/endpoint-94
- —The site advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base network.https://lowpaymentfee.com
- —USDC contract address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 is used for payment on Base.https://lowpaymentfee.com/api/endpoint-94
- —The site lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories.https://lowpaymentfee.com