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 `/api/v1/keys/82` 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 attach an X-PAYMENT header with a signed USDC payment to each request.
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 listed endpoints share the same $0.02/request pricing. The platform claims no rate limits, no minimums, and instant access.
Important caveat: the specific endpoint probed (`/api/v1/keys/82`) 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, OpenAPI spec, or usage examples are available. The /api, /pricing, and /README pages all returned only a "Connect wallet" prompt with no substantive content. Without schema details or response examples, it is unclear what data or functionality this particular endpoint returns.
Capabilities
Use cases
- —Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key management
- —Fetching real-time financial data such as token quotes, gas estimates, and exchange rates on a per-call basis
- —Running data analytics queries and exporting data with per-request billing
- —Using utility services like geocoding, validation, and conversion via micropayments
Fit
Best for
- —Agents or applications that need on-demand API access without subscriptions or accounts
- —Developers who want to pay per request in USDC on Base with no minimum commitment
- —Prototyping and low-volume use cases where per-call pricing is more economical than monthly plans
Not for
- —High-volume production workloads where per-request pricing at $0.02 may be expensive compared to bulk plans
- —Users who need detailed API documentation, SLAs, or guaranteed uptime
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/keys/82 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <signed-x402-payment-header>"Endpoint
Quality
The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI spec, no documentation, no request/response schema, and the specific endpoint's purpose ('Premium API Access') is vague. The /api, /pricing, and /README pages returned no useful content.
Warnings
- —No OpenAPI or schema documentation available for this endpoint or any endpoint on the platform
- —The specific endpoint /api/v1/keys/82 does not correspond to any named API in the site's catalog — its actual functionality is unknown
- —All documentation pages (/api, /pricing, /README) returned only 'Connect wallet' with no content
- —No response examples or error handling documentation available
Citations
- —The endpoint returns a 402 challenge requesting up to 20,000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base networkhttps://lowpaymentfee.com/api/v1/keys/82
- —The platform lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories, all priced at $0.02/requesthttps://lowpaymentfee.com
- —The platform advertises no API keys, no rate limits, instant access, and Base network settlementhttps://lowpaymentfee.com