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/142` 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 probed (`/api/v1/transfers/142`) does not clearly map to any of the documented API categories on the landing page. Its description is simply "Premium API Access" with no further documentation about what data or functionality it returns. The docs, pricing, and API pages all render only a "Connect wallet" prompt with no additional technical documentation, OpenAPI schema, or example payloads. Without more information, the actual behavior of this endpoint remains unclear.
Capabilities
Use cases
- —Accessing premium API endpoints without traditional API key registration
- —Making one-off API calls paid directly in USDC on Base
- —Agent-driven workflows that need keyless, per-request API access
Fit
Best for
- —Developers who want to pay per request without subscriptions or API keys
- —AI agents that can attach x402 payment headers automatically
- —Users already holding USDC on the Base network
Not for
- —Users who need detailed API documentation or OpenAPI schemas 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/transfers/142 \
-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 beyond a landing page, no example request/response payloads, and the specific endpoint's functionality is undocumented. The docs/pricing/API pages all render only 'Connect wallet' with no useful content.
Warnings
- —The endpoint /api/v1/transfers/142 does not appear in the documented API list on the landing page — its actual functionality is unknown.
- —No OpenAPI spec, no request/response schema, and no example payloads are available.
- —All documentation pages (docs, pricing, API, README) render only a 'Connect wallet' prompt with no technical content.
- —The purpose and output of this specific endpoint cannot be verified from available materials.
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/142
- —The platform lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories, all at $0.02/request.https://lowpaymentfee.com
- —The platform advertises no API keys, no rate limits, instant access, and Base network settlement.https://lowpaymentfee.com
- —USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913.https://lowpaymentfee.com/api/v1/transfers/142