Pay-per-call API platform on Base (USDC) offering data, AI, finance, and utility endpoints at $0.02/request.
What it does
lowpaymentfee.com is an x402-enabled API platform that provides a broad catalog of pay-per-request endpoints settled in USDC on the Base network. The specific endpoint `/api/v1/keys/34` is listed as "Premium API Access" and costs up to $0.02 per call (20,000 base units of USDC with 6 decimals). Payment is handled via the x402 protocol — no API keys, accounts, or subscriptions are required; callers attach an X-PAYMENT header with each request.
The wider platform advertises four endpoint 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. The platform claims no rate limits, no minimums, and instant access.
Important caveats: the specific endpoint probed (`/api/v1/keys/34`) does not clearly map to any of the documented API categories — its purpose is ambiguous and may relate to API key generation or retrieval. There is no OpenAPI schema, no request/response examples, and no detailed documentation available from the crawl. The /api, /pricing, and /README pages all returned only a "Connect wallet" prompt with no substantive content. Treat this listing as a lightweight stub until richer documentation surfaces.
Capabilities
Use cases
- —Agents that need on-demand AI inference (sentiment, summarization, classification) without managing API keys
- —Fetching real-time crypto token quotes or gas estimates via a single paid HTTP call
- —Geocoding or data validation as a utility microservice with per-request billing
- —Exporting analytics data or generating reports with zero subscription overhead
Fit
Best for
- —AI agents needing keyless, pay-per-call access to diverse utility endpoints
- —Developers who want to avoid API key management and subscription commitments
- —Crypto-native applications that can settle payments in USDC on Base
Not for
- —High-volume workloads where per-request pricing at $0.02 would be cost-prohibitive compared to bulk plans
- —Users who need detailed SLAs, rate-limit guarantees, or enterprise support
- —Applications that cannot interact with the x402 payment protocol or USDC on Base
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/keys/34 \
-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 OpenAPI schema, no request/response examples, and no meaningful documentation beyond a landing page listing. The specific endpoint path (/api/v1/keys/34) doesn't match any documented API category, making its purpose ambiguous.
Warnings
- —No OpenAPI schema or detailed documentation available
- —The endpoint path /api/v1/keys/34 does not correspond to any documented API category — its actual function is unclear
- —All documentation pages (/api, /pricing, /README) returned only a 'Connect wallet' prompt with no content
- —No request or response examples available; input/output formats are unknown
Citations
- —The platform lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories, all at $0.02/requesthttps://lowpaymentfee.com
- —Pricing is $0.02 per request with no API keys, no rate limits, no minimums, and instant access on the Base networkhttps://lowpaymentfee.com
- —The x402 challenge for /api/v1/keys/34 shows maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Basehttps://lowpaymentfee.com/api/v1/keys/34