Pay-per-call API platform on Base (USDC) via x402 — $0.02/request, no keys required.
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, settled in USDC on the Base network. The platform requires no API keys, no rate limits, and no upfront commitments — callers simply attach an x402 payment header to each request.
The specific endpoint at `/api/resource/25` is labeled "Premium API Access" and returns a 402 challenge requesting up to 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals) on Base. The payment is made to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using the exact payment scheme. The endpoint accepts POST requests and returns `application/json`.
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 extremely sparse: the docs, API, pricing, and README pages all render only a "Connect wallet" prompt with no further technical detail. No OpenAPI schema, request/response examples, or detailed endpoint documentation were found.
Capabilities
Use cases
- —Programmatic access to utility APIs without managing API keys or subscriptions
- —Agent-driven workflows that need on-demand API calls settled via crypto micropayments
- —Testing x402 payment flows against a live endpoint on Base
Fit
Best for
- —Developers wanting zero-friction, keyless API access via x402
- —AI agents that can autonomously pay per request using USDC on Base
- —Prototyping x402 payment integrations at low cost ($0.02/call)
Not for
- —Users who need detailed API documentation or OpenAPI specs before integrating
- —High-volume production workloads where per-request crypto settlement adds latency
- —Teams that require traditional authentication, SLAs, or support contracts
Quick start
curl -X POST https://lowpaymentfee.com/api/resource/25 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is live and returns a valid x402 402 challenge with clear pricing. However, documentation is essentially nonexistent beyond the landing page — no OpenAPI spec, no request/response examples, no explanation of what /api/resource/25 actually returns. The generic 'Premium API Access' label provides no specificity about the endpoint's function.
Warnings
- —No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet' with no content.
- —The purpose of /api/resource/25 is unclear; 'Premium API Access' is a generic label with no functional description.
- —No OpenAPI schema or request/response examples are provided anywhere.
- —No information on what data or service this specific endpoint actually delivers.
Citations
- —All endpoints priced at $0.02 per request with no API keys, no rate limits, instant access on Base networkhttps://lowpaymentfee.com
- —The x402 challenge requests maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Basehttps://lowpaymentfee.com/api/resource/25
- —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