Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.
What it does
lowpaymentfee.com is an x402-enabled API platform that offers a variety of endpoints across data analytics, AI/ML inference, finance/Web3, and infrastructure utilities. All endpoints are priced at $0.02 per request, paid in USDC on the Base network with no API keys, no rate limits, and no commitments required. The x402 protocol handles payment inline: callers attach a payment header to each request and receive the response immediately.
The specific endpoint being listed here (`/api/v1/customers/94`) is described as "Premium API Access" and returns `application/json`. Its x402 challenge advertises a max amount of 20,000 base units of USDC (0x8335… on Base), which equals $0.02 given USDC's 6 decimals. The endpoint accepts POST requests and is discoverable.
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 per-call price point. Documentation pages exist at /docs, /pricing, and /api but currently render only a "Connect wallet" prompt with no substantive content, so detailed request/response schemas are unavailable.
Capabilities
Use cases
- —Agents that need on-demand API access without managing API keys or subscriptions
- —Fetching real-time finance and crypto data (prices, exchange rates, gas estimates) with per-call payment
- —Running lightweight AI inference tasks (sentiment, summarization, classification, embeddings) at $0.02 each
- —Geocoding, data validation, and utility conversions without rate-limit concerns
Fit
Best for
- —AI agents and bots that can attach x402 payment headers automatically
- —Developers who want zero-commitment, pay-as-you-go API access
- —Use cases requiring small, infrequent API calls where subscriptions are wasteful
Not for
- —High-volume production workloads where per-call pricing becomes expensive at scale
- —Users who need detailed API documentation and typed schemas before integrating
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/customers/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, there is no OpenAPI schema, no request/response examples, and all documentation pages render only a wallet-connect prompt. The specific purpose of /api/v1/customers/94 is unclear beyond the generic 'Premium API Access' label.
Warnings
- —Documentation pages (/docs, /pricing, /api, /README) all render only 'Connect wallet' with no usable content
- —No OpenAPI or schema available — request and response formats are unknown
- —The specific endpoint /api/v1/customers/94 is not listed among the advertised APIs on the homepage; its purpose is unclear
- —No information about data sources, model providers, or SLAs
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 returns maxAmountRequired of 20000 base units of USDC (USD Coin) on Base networkhttps://lowpaymentfee.com/api/v1/customers/94
- —Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com