Pay-per-call API platform on Base (USDC) offering data, AI, finance, and utility endpoints at $0.02/request.
What it does
lowpaymentfee.com is an x402-enabled API platform that provides a broad catalog of pay-per-request endpoints settled in USDC on the Base network. The specific endpoint at `/api/v1/keys/79` is listed as "Premium API Access" and costs up to $0.02 per call (20,000 base units of USDC with 6 decimals). Payment is handled via the x402 protocol — no API keys, accounts, or subscriptions are required; callers simply attach an X-PAYMENT header with a valid payment proof.
The wider platform advertises four endpoint 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.
However, the specific endpoint probed here (`/api/v1/keys/79`) does not clearly map to any of the named API categories on the landing page. Its description is simply "Premium API Access," and no documentation, request/response schemas, or usage examples are available. The crawled docs, pricing, and README pages all returned only a "Connect wallet" prompt with no additional content. Without knowing what this endpoint actually returns, callers should treat it as an opaque paid resource until further documentation is published.
Capabilities
Use cases
- —Programmatic access to paid API resources without account signup or API key management
- —Agent-driven workflows that need on-demand API calls settled in USDC on Base
- —Exploring x402 protocol integration for pay-per-request microservices
Fit
Best for
- —Developers or agents wanting frictionless pay-per-call access without subscriptions
- —x402 protocol integrators looking for low-cost test endpoints
- —Crypto-native applications that settle in USDC on Base
Not for
- —Users who need detailed API documentation or guaranteed SLAs before paying
- —High-volume consumers seeking bulk pricing or rate-limited tiers
- —Anyone without a Base-compatible USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/keys/79 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-proof>"Endpoint
Quality
The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no request/response schema, and no explanation of what /api/v1/keys/79 actually does. The crawled pages beyond the landing page returned no useful content. This is effectively a stub listing.
Warnings
- —No documentation available — /api, /pricing, and /README pages all returned only 'Connect wallet' with no content.
- —The endpoint path /api/v1/keys/79 does not match any of the named APIs on the landing page; its actual functionality is unknown.
- —No request or response schema is provided; callers cannot know what to send or what to expect back.
- —No OpenAPI spec, ai-plugin manifest, or agents.txt found.
Citations
- —The endpoint returns a 402 challenge requesting up to 20,000 base units of USDC (asset 0x8335…) on Base network.https://lowpaymentfee.com/api/v1/keys/79
- —The platform lists endpoints at $0.02/request with no API keys, no rate limits, and instant access on Base network.https://lowpaymentfee.com
- —USDC contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 is the canonical USDC on Base with 6 decimals.https://lowpaymentfee.com