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 & machine learning, finance & Web3, and infrastructure utility categories. All endpoints are priced at $0.02 per request, payable in USDC on the Base network with no API keys, no rate limits, and no commitments required.
The specific endpoint at `/api/v1/customers/97` is labeled "Premium API Access" and accepts POST requests. The x402 challenge confirms it is live, requesting up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is made via the x402 exact scheme, settling 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 generation — all at the same $0.02 price point. However, documentation pages (/docs, /pricing, /api, /README) returned only a "Connect wallet" prompt with no substantive content, so the actual functionality, request/response schemas, and data sources behind these endpoints remain undocumented and unverifiable.
Capabilities
Use cases
- —Accessing premium data or customer records via a single paid POST request
- —Agent-driven workflows that need low-friction, keyless API access settled in USDC
- —Testing x402 payment flows on Base network
Fit
Best for
- —Developers experimenting with x402 payment protocol
- —Agents needing keyless, per-call API access on Base
- —Low-volume consumers who prefer pay-as-you-go pricing
Not for
- —Users who need detailed API documentation or guaranteed SLAs
- —High-volume production workloads requiring predictable bulk pricing
- —Developers who cannot pay in USDC on Base network
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/customers/97 \
-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), but there is no documentation, no OpenAPI schema, no request/response examples, and the purpose of the /customers/97 endpoint is entirely opaque. All doc pages returned only 'Connect wallet' with no content.
Warnings
- —No API documentation available — /docs, /pricing, /api, and /README all returned only 'Connect wallet'
- —The specific endpoint /api/v1/customers/97 has no description beyond 'Premium API Access'; its actual functionality is unknown
- —No request or response schema is documented; callers cannot know what to send or expect back
- —The endpoint path suggests customer data, which could involve PII — exercise caution
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 Basehttps://lowpaymentfee.com/api/v1/customers/97
- —Platform offers endpoints across data & analytics, AI & ML, finance & Web3, and infrastructure categorieshttps://lowpaymentfee.com