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 broad catalog of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and utility services. Every endpoint costs $0.02 per request, paid in USDC on the Base network with no API keys, no rate limits, and no upfront commitments. The specific endpoint at `/api/v1/customers/31` is labeled "Premium API Access" and returns JSON via POST.
The platform advertises four endpoint families: 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 are priced uniformly at $0.02 per call.
The x402 challenge for this particular endpoint specifies a maxAmountRequired of 20000 base units of USDC (0x8335… on Base, 6 decimals), which equals $0.02. Payment is settled on-chain to the provider's wallet. No OpenAPI schema, detailed documentation, or example request/response payloads were found in the crawl — the docs, pricing, and README pages all rendered only a "Connect wallet" prompt with no additional content.
Capabilities
Use cases
- —Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key management
- —Fetching real-time financial data such as token quotes, exchange rates, and gas estimates
- —Running utility operations like geocoding, validation, and data conversion on a per-call basis
- —Integrating pay-per-use analytics and data export into agent workflows
Fit
Best for
- —Agents or developers who want zero-signup, pay-per-call API access
- —Use cases requiring small, infrequent API calls where subscription pricing is wasteful
- —Crypto-native workflows that can settle USDC on Base
Not for
- —High-volume production workloads where per-call pricing at $0.02 adds up quickly
- —Users who need detailed API documentation, SDKs, or OpenAPI specs before integrating
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/customers/31 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is live and returns a valid x402 challenge with clear pricing. However, there is no OpenAPI schema, no example request/response payloads, and the docs/pricing/README pages are empty beyond a wallet-connect prompt. The specific purpose of `/api/v1/customers/31` (labeled 'Premium API Access') is unclear and not documented.
Warnings
- —No OpenAPI or schema documentation available for any endpoint
- —The docs, pricing, and README pages render only a 'Connect wallet' prompt with no usable content
- —The specific endpoint /api/v1/customers/31 is not listed on the homepage catalog — its purpose is undocumented
- —No example request or response bodies are available; integration requires trial and error
Citations
- —All endpoints cost $0.02 per request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —The platform offers Data & Analytics, AI & ML, Finance & Web3, and Infrastructure endpoint familieshttps://lowpaymentfee.com
- —x402 challenge specifies maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Basehttps://lowpaymentfee.com/api/v1/customers/31