Pay-per-call API platform on Base (USDC) via x402 — $0.02/request, no API keys required.
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 utility services. Every endpoint costs $0.02 per request, paid in USDC on the Base network. The x402 protocol means there are no API keys, no sign-ups, and no rate limits — callers simply attach an X-PAYMENT header with a valid payment proof to each request.
The specific endpoint at `/api/v1/accounts/84` is listed as "Premium API Access" and accepts POST requests. 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 payment is settled on-chain to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout window.
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 thin (docs, pricing, and API pages all render only a "Connect wallet" prompt), so the actual request/response schemas for this and other endpoints are unknown.
Capabilities
Use cases
- —Accessing premium API data without creating an account or managing API keys
- —Agent-driven workflows that need on-demand API calls settled in USDC on Base
- —Programmatic access to analytics, AI inference, or financial data with per-request billing
Fit
Best for
- —Developers or agents who want zero-signup, pay-as-you-go API access
- —x402-compatible clients that can construct USDC payment proofs on Base
- —Low-volume or bursty workloads where per-call pricing is more economical than subscriptions
Not for
- —Users who need detailed API documentation or OpenAPI schemas before integrating
- —High-volume production workloads where $0.02/request adds up significantly
- —Callers who cannot transact in USDC on the Base network
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/accounts/84 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-proof>"Endpoint
Quality
The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI schema, no documentation of request/response formats, and the docs/pricing/API pages are all empty beyond a wallet-connect prompt. The purpose of the specific /api/v1/accounts/84 endpoint is unclear beyond the generic label "Premium API Access."
Warnings
- —No OpenAPI or request/response schema available — callers cannot determine what to POST or what the response looks like.
- —Documentation pages (/docs, /pricing, /api, /README) all render only 'Connect wallet' with no usable content.
- —The specific purpose of /api/v1/accounts/84 ('Premium API Access') is ambiguous and not documented.
- —Cannot verify what data or service this endpoint actually returns.
Citations
- —The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Base networkhttps://lowpaymentfee.com/api/v1/accounts/84
- —USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/accounts/84
- —All endpoints priced at $0.02 per request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com