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/transfers/143` 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 the same $0.02/request price point.
This particular endpoint (`/api/v1/transfers/143`) falls under "Premium API Access" but the crawled documentation provides no further detail on what data or functionality it returns. The docs, pricing, and API pages all render only a "Connect wallet" prompt with no additional technical documentation or schema information. Without more detail on the response payload, callers should treat this as an exploratory endpoint with uncertain output.
Capabilities
Use cases
- —Programmatic access to premium API data with per-call USDC micropayments
- —Agent-driven workflows that need keyless, pay-as-you-go API access
- —Testing x402 protocol integrations on Base network
Fit
Best for
- —Developers experimenting with x402 payment protocol
- —Agents needing keyless API access with crypto micropayments
- —Low-volume callers who want no subscription commitments
Not for
- —Users who need detailed API documentation or response schemas before calling
- —High-volume production workloads where $0.02/request adds up quickly
- —Users without a Base network USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/transfers/143 \
-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 OpenAPI schema, no documentation beyond a landing page listing, no example request/response payloads, and the docs/pricing/API pages are all empty (just 'Connect wallet'). The specific purpose of /api/v1/transfers/143 is unclear beyond the generic label 'Premium API Access'.
Warnings
- —No documentation available — docs, pricing, and API pages all render only 'Connect wallet' with no content.
- —The specific functionality of /api/v1/transfers/143 is undocumented; 'Premium API Access' is the only description.
- —No request or response schema is provided; callers cannot know what to send or expect back.
- —The platform lists many endpoint categories (AI, finance, analytics, infrastructure) but provides no evidence any of them return real data.
Citations
- —The endpoint returns a 402 challenge requesting up to 20,000 base units of USDC ($0.02) on Base network.https://lowpaymentfee.com/api/v1/transfers/143
- —The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access.https://lowpaymentfee.com
- —The USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913.https://lowpaymentfee.com/api/v1/transfers/143
- —Docs, pricing, and API pages render only 'Connect wallet' with no additional content.https://lowpaymentfee.com/docs