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 utility services. 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/charges/187` is listed as "Premium API Access" and requires a maximum of 20,000 base units of USDC (i.e., $0.02, since USDC uses 6 decimals). The x402 challenge confirms the endpoint is live, accepts the "exact" payment scheme on Base, and responds with `application/json`. The payment is directed to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` with a 300-second timeout.
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. However, documentation beyond the landing page is essentially empty (all sub-pages just show "Connect wallet"), so the actual request/response schemas for individual endpoints are unknown. Without OpenAPI specs or usage examples, callers will need to experiment or contact the provider to understand input formats and response structures.
Capabilities
Use cases
- —Accessing premium API endpoints without subscriptions or API keys
- —Making micropayment-gated API calls settled in USDC on Base
- —Agent-driven workflows that need on-demand paid API access
Fit
Best for
- —Developers wanting zero-commitment pay-per-use API access
- —AI agents that can handle x402 payment challenges natively
- —Users who prefer crypto-settled micropayments over traditional billing
Not for
- —Users who need detailed API documentation and schemas before integrating
- —High-volume callers who would benefit from bulk pricing or subscriptions
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/charges/187 \
-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 spec, no documentation, no request/response schema, and no usage examples. All doc pages return only 'Connect wallet'. The specific purpose of /api/v1/charges/187 beyond 'Premium API Access' is unknown.
Warnings
- —No OpenAPI or schema documentation available — request/response formats are unknown
- —All documentation pages (/docs, /api, /pricing, /README) are empty, showing only 'Connect wallet'
- —The specific functionality of /api/v1/charges/187 ('Premium API Access') is not described anywhere
- —Cannot verify what data or service this endpoint actually returns
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 (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, equaling $0.02https://lowpaymentfee.com/api/v1/charges/187
- —Payment directed to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with 300-second timeouthttps://lowpaymentfee.com/api/v1/charges/187