Pay-per-request API platform on Base network via x402 — $0.02/call in USDC, 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/products/18` is listed as "Premium API Access" and returns JSON content. The x402 challenge indicates a max cost of 20,000 base units of USDC (0.02 USD per request), consistent with the site's advertised $0.02/request pricing across all endpoints.
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 uniformly at $0.02 per request.
The platform advertises no API keys, no rate limits, and instant access. Payment is handled entirely through the x402 protocol — callers send a payment proof in the X-PAYMENT header with each request. The endpoint accepts POST requests and settles payments to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using USDC (`0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`) on Base. However, the specific functionality of the `/api/v1/products/18` endpoint is unclear — the description is generic ("Premium API Access") and no documentation, request schema, or response schema is available beyond the x402 challenge metadata.
Capabilities
Use cases
- —Programmatic access to a premium API endpoint with per-request USDC micropayments
- —Agent-driven workflows that need keyless, on-demand API access settled on Base
- —Testing x402 protocol integrations with a low-cost live endpoint
Fit
Best for
- —Developers experimenting with x402 payment protocol
- —AI 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 guaranteed SLAs
- —High-volume use cases where $0.02/request adds up significantly
- —Anyone without a Base-network USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/products/18 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-proof>"Endpoint
Quality
The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base). However, there is no documentation for what /api/v1/products/18 actually returns, no request/response schema, and the crawled docs/pricing/README pages are all blank beyond a 'Connect wallet' prompt. The specific functionality of this endpoint is unknown.
Warnings
- —No documentation available — docs, pricing, and README pages all render only a 'Connect wallet' prompt with no content
- —The specific functionality of /api/v1/products/18 ('Premium API Access') is undefined; it does not map to any of the named endpoints on the landing page
- —No request or response schema provided; callers cannot know what to send or expect back
- —No OpenAPI spec or AI plugin manifest available
Citations
- —The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Basehttps://lowpaymentfee.com/api/v1/products/18
- —USDC contract address on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/products/18
- —All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —The platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com