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/47` is labeled "Premium API Access" and returns JSON via POST.
The 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 are priced uniformly at $0.02 per call.
The x402 challenge was successfully captured, confirming the endpoint is live. Payment is settled on Base using USDC (contract 0x8335…2913) with an exact-scheme challenge requiring a maximum of 20,000 base units (i.e., $0.02 given USDC's 6 decimals). Documentation pages beyond the landing page returned only a "Connect wallet" prompt, so detailed request/response schemas, parameter descriptions, and example payloads are not available from the crawl.
Capabilities
Use cases
- —Querying real-time financial data (prices, exchange rates, gas estimates) without API key management
- —Running AI inference tasks (sentiment, summarization, classification, embeddings) on a per-call payment basis
- —Accessing utility services like geocoding or data validation with instant, keyless access
- —Building agent workflows that pay per request using x402 on Base
Fit
Best for
- —Developers wanting zero-setup, pay-as-you-go API access
- —AI agents that can settle x402 micropayments in USDC on Base
- —Projects needing lightweight, keyless access to diverse API categories
Not for
- —Users who need detailed API documentation or OpenAPI schemas before integrating
- —High-volume consumers who would benefit from bulk pricing or subscription plans
- —Users without a Base-compatible USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/customers/47 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The x402 challenge is live and pricing is clear ($0.02/request in USDC on Base). However, documentation pages are empty beyond the landing page, there is no OpenAPI schema, no request/response examples, and the specific purpose of the /api/v1/customers/47 endpoint is unclear beyond its generic 'Premium API Access' label.
Warnings
- —No OpenAPI or detailed API documentation available — all doc pages returned only 'Connect wallet'
- —The specific endpoint /api/v1/customers/47 is not listed among the advertised catalog endpoints; its exact function is unknown
- —No request body schema or response schema is documented anywhere in the crawl
Citations
- —All endpoints cost $0.02 per request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —The x402 challenge returns maxAmountRequired of 20000 base units in USDC (6 decimals = $0.02) on Basehttps://lowpaymentfee.com/api/v1/customers/47
- —Platform offers endpoints in Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com
- —USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/customers/47