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 spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities. All endpoints are pay-per-request at $0.02 each, settled in USDC on the Base network. No API keys, rate limits, or subscriptions are required — callers simply attach an x402 payment header to each request.
The specific endpoint at `/api/v1/transfers/184` is listed as "Premium API Access" and its 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. The endpoint accepts POST requests and returns application/json. The broader platform advertises additional endpoint categories including sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, geocoding, validation, and more — all at the same $0.02 per call.
Documentation is extremely sparse. The docs, API, pricing, and README pages all render only a "Connect wallet" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no detailed documentation for any endpoint. The x402 challenge is live and well-formed, confirming the endpoint is operational, but without documentation it is unclear what input the `/api/v1/transfers/184` endpoint expects or what it returns.
Capabilities
Use cases
- —Agent-driven API calls with automatic per-request USDC micropayments
- —Accessing AI inference (sentiment, summarization, classification, embeddings) without API key management
- —Fetching financial data (prices, exchange rates, gas estimates) on a pay-as-you-go basis
- —Utility operations (geocoding, validation, conversion) with no subscription commitment
Fit
Best for
- —Developers or agents wanting frictionless pay-per-call API access without signup
- —Crypto-native workflows that can settle in USDC on Base
- —Low-volume or bursty usage patterns where subscriptions are wasteful
Not for
- —Users needing detailed API documentation or guaranteed SLAs before integration
- —High-volume production workloads where per-call pricing at $0.02 may be expensive compared to bulk plans
- —Users who cannot transact in USDC on the Base network
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/transfers/184 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The x402 challenge is live and well-formed, confirming the endpoint works 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 purpose of the specific '/transfers/184' endpoint is unknown beyond its generic 'Premium API Access' label.
Warnings
- —No API documentation available — docs, pricing, API, and README pages all show only 'Connect wallet'
- —No OpenAPI or JSON schema describing request/response formats for any endpoint
- —The specific purpose of /api/v1/transfers/184 ('Premium API Access') is unclear — it may be a generic or placeholder endpoint
- —Cannot verify what data or functionality any of the advertised endpoints actually provide
Citations
- —All endpoints priced at $0.02 per request with no API keys, rate limits, or minimumshttps://lowpaymentfee.com
- —x402 challenge returns maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base networkhttps://lowpaymentfee.com/api/v1/transfers/184
- —Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com
- —Docs, API, pricing, and README pages render only 'Connect wallet' with no further contenthttps://lowpaymentfee.com/docs