Pay-per-call API platform on Base via x402 — $0.02/request for data, AI, finance, and utility endpoints.
What it does
lowpaymentfee.com is an x402-enabled API platform that offers a suite of 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 endpoints are priced at $0.02 per request and settle in USDC on the Base network.
The specific endpoint at `/api/v1/charges/346` is listed as "Premium API Access" and accepts POST requests. The x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is made via the x402 exact scheme with no API keys or rate limits required — callers simply attach an X-PAYMENT header to each request.
Documentation is extremely sparse. The crawled docs, API, pricing, and README pages all returned only a "Connect wallet" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no detailed description of what the `/api/v1/charges/346` endpoint specifically returns. The landing page confirms the general platform offering and pricing model, but the exact behavior of this particular charge endpoint is unclear.
Capabilities
Use cases
- —Agents that need on-demand API access without managing API keys or subscriptions
- —Programmatic access to data analytics, AI inference, or financial data with per-call USDC payments
- —Web3-native applications that want to consume utility APIs settled on Base
Fit
Best for
- —Developers wanting zero-commitment, pay-as-you-go API access
- —AI agents with crypto wallets that can settle x402 payments automatically
- —Low-volume or bursty workloads where per-request pricing is more economical than subscriptions
Not for
- —High-volume production workloads where $0.02/request adds up significantly
- —Users without a Base-compatible wallet or USDC holdings
- —Anyone needing detailed API documentation or SLA guarantees before integration
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/charges/346 \
-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 OpenAPI schema, no request/response examples, and no documentation beyond a landing page listing. The specific purpose of /api/v1/charges/346 ('Premium API Access') is undefined — it's unclear what data or service it returns.
Warnings
- —No OpenAPI or schema documentation available for this endpoint
- —All docs/pricing/README pages return only 'Connect wallet' with no usable content
- —The specific behavior and response format of /api/v1/charges/346 is undocumented
- —No request body schema or response examples are available anywhere in the crawl
Citations
- —All endpoints are priced at $0.02 per request with no minimums or commitmentshttps://lowpaymentfee.com
- —Payment settles in USDC on the Base network with no API keys or rate limitshttps://lowpaymentfee.com
- —The x402 challenge shows maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Basehttps://lowpaymentfee.com/api/v1/charges/346
- —Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com