Pay-per-call premium API endpoint on Base via x402 — $0.02/request in USDC.
What it does
This endpoint at `/api/endpoint-70` is part of the lowpaymentfee.com platform, which offers a collection of pay-per-request APIs spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities. All endpoints are accessed via the x402 payment protocol, settling in USDC on the Base network. The platform advertises a flat $0.02 per request with no API keys, no rate limits, and instant access.
The specific endpoint `/api/endpoint-70` is labeled "Premium API Access" but its exact functionality is not documented beyond that generic title. It does not appear in the site's listed API catalog (which uses `/api/v1/` and `/api/v2/` path prefixes), so its purpose is unclear. The x402 challenge confirms it is live and accepts POST requests, requiring up to 20,000 base units of USDC (0.02 USD) per call on the Base network. The response MIME type is `application/json`.
Documentation on the site is extremely thin — the docs, pricing, API, and README pages all render only a "Connect wallet" prompt with no substantive content. There is no OpenAPI schema, no request/response examples, and no description of what this particular endpoint returns. Prospective users should be aware that while the payment mechanism is functional, the actual service behind this endpoint is undocumented.
Capabilities
Use cases
- —Programmatic access to a pay-per-call API without requiring API keys or subscriptions
- —Agent-driven workflows that need on-demand API calls settled in USDC on Base
- —Testing x402 payment protocol integrations against a live endpoint
Fit
Best for
- —Developers exploring x402 payment-gated APIs
- —Agents that can settle USDC micropayments on Base
- —Users who want keyless, commitment-free API access
Not for
- —Users who need documented request/response schemas before integrating
- —Applications requiring free or fiat-settled API access
- —Production workloads that depend on well-documented endpoint behavior
Quick start
curl -X POST https://lowpaymentfee.com/api/endpoint-70 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-header>"Endpoint
Quality
The x402 challenge is live and pricing is clear ($0.02 USDC on Base), but the endpoint's actual functionality is completely undocumented. No OpenAPI schema, no request/response examples, and the docs pages are empty. The generic title 'Premium API Access' provides no insight into what the endpoint does.
Warnings
- —Endpoint functionality is entirely undocumented — 'Premium API Access' is a generic label with no specifics
- —This endpoint path (/api/endpoint-70) does not appear in the site's listed API catalog
- —All documentation pages (docs, pricing, API, README) render only a 'Connect wallet' prompt with no content
- —No OpenAPI schema or request/response examples available
- —Cannot determine what data or service this endpoint actually provides
Citations
- —The platform charges $0.02 per request with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —The x402 challenge requires up to 20,000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base networkhttps://lowpaymentfee.com/api/endpoint-70
- —The site lists APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com