Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.
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 pay-per-request at $0.02 each, settled in USDC on the Base network. No API keys, rate limits, or commitments are required — callers simply attach an x402 payment header to each request.
The specific endpoint at `/api/v1/products/40` is listed as "Premium API Access" and returns `application/json`. The x402 challenge indicates a maxAmountRequired of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is made via the "exact" scheme to the specified payTo address, with a 300-second timeout.
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. However, the specific functionality behind the `/api/v1/products/40` endpoint is not documented beyond its title "Premium API Access," and the site's docs, pricing, and API pages appear to require wallet connection to view content. Without further documentation, the exact input/output schema for this endpoint remains unknown.
Capabilities
Use cases
- —Accessing premium API data with per-request USDC micropayments on Base
- —Agent-driven workflows that need keyless, pay-as-you-go API access
- —Programmatic access to various utility and data endpoints without subscription commitments
Fit
Best for
- —Developers wanting zero-commitment, pay-per-use API access
- —AI agents that can settle x402 payments autonomously on Base
- —Users who prefer crypto-native micropayments over traditional API key subscriptions
Not for
- —Users who need detailed API documentation and schemas before integrating
- —High-volume consumers who would benefit from bulk pricing or subscriptions
- —Developers without access to USDC on the Base network
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/products/40 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-header>"Endpoint
Quality
The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base). However, the specific functionality of /api/v1/products/40 is undocumented, there is no OpenAPI schema, no request/response examples, and the docs pages all render as just 'Connect wallet' with no usable content. The listing is essentially a stub with confirmed liveness and pricing.
Warnings
- —The exact functionality of /api/v1/products/40 ('Premium API Access') is not documented — it is unclear what data or service it provides.
- —All documentation pages (docs, pricing, API, README) render only 'Connect wallet' with no visible content, suggesting docs may be gated or incomplete.
- —No OpenAPI schema, request format, or response examples are available for this endpoint.
- —The platform lists many endpoints on its homepage but none have detailed documentation visible without wallet connection.
Citations
- —The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base networkhttps://lowpaymentfee.com/api/v1/products/40
- —USDC contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/products/40
- —All endpoints priced at $0.02 per request with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com