Pay-per-request API platform on Base network via x402 — $0.02/call in USDC.
What it does
lowpaymentfee.com is an x402-enabled API marketplace that offers a variety of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and utility services. All endpoints are pay-per-request at $0.02 each, settled in USDC on the Base network. No API keys, accounts, or rate limits are required — callers simply attach an x402 payment header to each request.
The specific endpoint at `/api/v1/products/80` is listed as "Premium API Access" and returns `application/json`. The x402 challenge indicates a maxAmountRequired of 20,000 base units of USDC (0x8335… on Base), which equals $0.02 given USDC's 6 decimals. Payment is made to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using the "exact" scheme with a 300-second timeout.
The broader platform advertises endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and generation — all at the same $0.02 price point. However, documentation beyond the landing page is essentially empty (all sub-pages just show "Connect wallet"), so the actual input/output schemas, supported parameters, and response formats for any of these endpoints are unknown. The `/api/v1/products/80` endpoint specifically lacks any description of what "Premium API Access" actually returns.
Capabilities
Use cases
- —Agents needing on-demand API access without pre-registration or API keys
- —Programmatic access to various utility and data endpoints with crypto micropayments
- —Testing x402 payment protocol integrations on Base network
Fit
Best for
- —Developers wanting zero-friction API access with no signup
- —AI agents that can settle x402 payments autonomously on Base
- —Users who prefer pay-as-you-go pricing with no commitments
Not for
- —Users who need detailed API documentation and well-defined schemas before integrating
- —High-volume consumers who would benefit from bulk pricing or subscriptions
- —Users without access to USDC on the Base network
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/products/80 \
-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, there is no documentation, no OpenAPI schema, no description of what this specific endpoint actually returns, and all doc/pricing/API pages are empty beyond a 'Connect wallet' prompt. The listing is effectively a stub with unknown functionality.
Warnings
- —No documentation available — all sub-pages (docs, api, pricing, README) return only 'Connect wallet'
- —The purpose and response format of /api/v1/products/80 ('Premium API Access') is completely undocumented
- —No OpenAPI spec or input/output schema provided
- —Cannot verify what data or service this endpoint actually delivers
Citations
- —All endpoints priced at $0.02 per request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —x402 challenge shows maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base with 300s timeouthttps://lowpaymentfee.com/api/v1/products/80
- —Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com