Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.
What it does
lowpaymentfee.com is a pay-per-request API platform that uses the x402 protocol to accept USDC payments on the Base network. The specific endpoint `/api/v1/charges/132` is listed as "Premium API Access" and returns a 402 challenge requesting up to 20,000 base units of USDC (i.e., $0.02) per call. The platform advertises no API keys, no rate limits, and instant access — you simply attach an x402 payment header to each request.
The broader platform offers endpoints across four categories: Data & Analytics (metrics, reports, data export, insights), AI & Machine Learning (sentiment analysis, text summarization, classification, embeddings), Finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and Infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are listed at $0.02 per request.
However, the specific endpoint `/api/v1/charges/132` does not clearly map to any of the named API categories on the landing page. There is no OpenAPI schema, no detailed documentation, and no example request/response bodies available from the crawled pages. The docs, pricing, API, and README pages all rendered only a "Connect wallet" prompt with no additional content. As a result, the actual functionality behind this particular endpoint remains unclear.
Capabilities
Use cases
- —Programmatic access to API services without traditional API key registration
- —Agent-driven workflows that need on-demand API calls settled in USDC
- —Paying per request for data, AI inference, or utility endpoints on Base
Fit
Best for
- —Developers or agents who want keyless, pay-as-you-go API access
- —x402-compatible clients on the Base network
- —Low-volume or sporadic API usage where subscriptions are unnecessary
Not for
- —Users who need detailed API documentation or OpenAPI specs before integrating
- —High-volume consumers who would benefit from bulk pricing or subscriptions
- —Anyone without a Base-network USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/charges/132 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI schema, no documentation, no example requests or responses, and the specific function of /api/v1/charges/132 is not explained anywhere in the crawled material. The docs pages are empty beyond a wallet-connect prompt.
Warnings
- —No OpenAPI or schema documentation available for this endpoint
- —The specific endpoint /api/v1/charges/132 does not correspond to any named API on the landing page — its actual functionality is unknown
- —All documentation pages (docs, pricing, API, README) returned only a 'Connect wallet' prompt with no substantive content
- —No example request or response bodies are available to verify what this endpoint actually returns
Citations
- —The endpoint returns a 402 challenge requesting up to 20,000 base units of USDC ($0.02) on Base networkhttps://lowpaymentfee.com/api/v1/charges/132
- —The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —The USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/charges/132
- —The platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com