Pay-per-call API platform on Base with USDC payments via x402 — $0.02/request, no API keys required.
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/policies/25` is listed as "Premium API Access" and returns JSON. It charges up to 20,000 base units of USDC (0.02 USD per request, since USDC uses 6 decimals) with no API keys, no rate limits, and no commitments required.
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 priced at $0.02 per request and settle via USDC on Base.
This particular endpoint (`/api/v1/policies/25`) is labeled "Premium API Access" but no further documentation describes what data or functionality it actually returns. The docs, pricing, API, and README pages all render only a "Connect wallet" prompt with no substantive content. Without schema details or example responses, the exact purpose of this endpoint remains unclear.
Capabilities
Use cases
- —Programmatic access to a premium API endpoint with per-call USDC micropayments
- —Agent-driven workflows that need keyless, on-demand API access settled on Base
- —Testing x402 payment flows against a live endpoint
Fit
Best for
- —Developers experimenting with x402 payment protocol
- —Agents that need keyless pay-per-use API access
- —Low-volume consumers who want no subscription commitments
Not for
- —Users who need detailed API documentation or response schemas before integrating
- —High-volume use cases where per-request crypto payments add overhead
- —Anyone without a Base-compatible USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/policies/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, confirming pricing and payment details. However, there is no documentation, no OpenAPI schema, no example request/response, and no description of what the endpoint actually returns. The docs pages are empty beyond a wallet-connect prompt. This is effectively a stub listing.
Warnings
- —No documentation available — docs, pricing, API, and README pages all show only 'Connect wallet' with no content
- —The purpose and response format of /api/v1/policies/25 ('Premium API Access') is completely undocumented
- —No OpenAPI schema or example responses are provided
- —No request body schema is documented — unclear what POST body is expected
Citations
- —Endpoint returns 402 with x402 challenge requiring USDC payment on Base networkhttps://lowpaymentfee.com/api/v1/policies/25
- —maxAmountRequired is 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913), equaling $0.02https://lowpaymentfee.com/api/v1/policies/25
- —Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —Platform lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com