Pay-per-call API platform on Base network via x402 — $0.02/request 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. The specific endpoint `/api/endpoint-43` is labeled "Premium API Access" and accepts USDC payments on Base. The x402 challenge indicates a maximum amount of 20,000 base units of USDC (6 decimals), which equals $0.02 per request. No API keys or rate limits are advertised; callers pay per request using an X-PAYMENT header.
The broader 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 are priced at $0.02 per request.
However, the specific endpoint `/api/endpoint-43` does not correspond to any of the named endpoints on the site's landing page. Its exact functionality is undocumented — the description simply says "Premium API Access" with no input/output schema, no examples, and no further documentation. The docs, pricing, and API pages all returned only a "Connect wallet" prompt with no substantive content. Without knowing what this endpoint actually does, callers should treat it as an opaque premium endpoint with unknown behavior.
Capabilities
Use cases
- —Programmatic access to an unnamed premium API service for $0.02 per call
- —Agent-driven workflows that need keyless, pay-as-you-go API access on Base
- —Testing x402 payment flows against a live endpoint
Fit
Best for
- —Developers experimenting with x402 payment protocol
- —Agents that need low-cost per-request API access without signup
- —Crypto-native applications settling microtransactions on Base
Not for
- —Users who need documented input/output schemas before calling
- —Anyone requiring guaranteed SLAs or support
- —Use cases requiring free or subscription-based pricing
Quick start
curl -X POST https://lowpaymentfee.com/api/endpoint-43 \
-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), but there is no documentation, no input/output schema, no examples, and the endpoint path doesn't match any named service on the site. The docs/pricing/API pages are all empty. This is effectively a stub listing.
Warnings
- —Endpoint /api/endpoint-43 is not listed among the named endpoints on the landing page — its actual functionality is unknown.
- —No input or output schema is provided; callers cannot know what to send or what to expect back.
- —All documentation pages (docs, pricing, API, README) returned only 'Connect wallet' with no content.
- —The platform's legitimacy and reliability are unverifiable from available materials.
Citations
- —The x402 challenge returns maxAmountRequired of 20000 base units of USDC on Base networkhttps://lowpaymentfee.com/api/endpoint-43
- —USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/endpoint-43
- —All listed endpoints are priced at $0.02 per request with no API keys, no rate limitshttps://lowpaymentfee.com
- —Platform advertises endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com