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 pay-per-request at $0.02 each, settled in USDC on the Base network. No API keys, accounts, or rate limits are required — callers simply attach an x402 payment header to each request.
The specific endpoint at `/api/v1/customers/63` is listed as "Premium API Access" and returns `application/json`. Its x402 challenge advertises a maxAmountRequired 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 data generation — all at the same $0.02 price point. Documentation pages exist but appear to require a wallet connection to view, so detailed request/response schemas are not available from the crawl.
Capabilities
Use cases
- —Agents making one-off API calls without needing to register or manage API keys
- —Accessing AI inference (sentiment, summarization, classification, embeddings) with per-request crypto payment
- —Fetching real-time finance data (prices, exchange rates, gas estimates) via micropayments
- —Geocoding, validation, and data conversion utilities paid per call
Fit
Best for
- —AI agents that need frictionless, keyless API access
- —Developers experimenting with x402 payment protocol on Base
- —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 who cannot transact in USDC on the Base network
- —Applications requiring detailed SLAs, rate guarantees, or support contracts
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/customers/63 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The x402 challenge is live and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI schema, no documented request/response formats, and all docs/pricing/README pages only show 'Connect wallet' with no substantive content. The specific purpose of /api/v1/customers/63 is unclear beyond the generic 'Premium API Access' label.
Warnings
- —No OpenAPI or request/response schema available — callers must guess at expected input format
- —Documentation, pricing, and README pages are empty or wallet-gated, providing no useful technical detail
- —The specific endpoint /api/v1/customers/63 has an opaque name ('Premium API Access') with no description of what customer data it returns or expects
- —The platform lists many endpoint categories but it is unclear which are actually functional vs. placeholder
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 (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Basehttps://lowpaymentfee.com/api/v1/customers/63
- —Platform offers endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com