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 collection of endpoints spanning data analytics, AI/ML inference, finance/crypto market data, and general utility services. All endpoints are paid per-request using USDC on the Base network via the x402 protocol, with no API keys, rate limits, or subscriptions required.
The specific endpoint at `/api/v1/item/44` is listed as "Premium API Access" and accepts POST requests. The x402 challenge indicates a maximum cost of 20,000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base), which equals $0.02 per request (USDC uses 6 decimals). The platform advertises a uniform $0.02 price across all its endpoints.
The broader platform offers endpoints in 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). Documentation pages exist at /docs, /pricing, and /README but all returned only a "Connect wallet" prompt with no substantive content during crawl. The exact input/output schemas for `/api/v1/item/44` and other endpoints are not documented in the crawled material, making it unclear what data this specific endpoint returns or what request body it expects.
Capabilities
Use cases
- —Accessing AI inference (sentiment, summarization, classification, embeddings) without subscriptions or API keys
- —Fetching real-time financial data and crypto market quotes on a per-request basis
- —Running data analytics and generating reports with pay-as-you-go pricing
- —Using utility services like geocoding, validation, and conversion without rate limits
Fit
Best for
- —Agents and developers who want instant, keyless API access paid in USDC
- —Low-volume or bursty workloads where per-request pricing is more economical than subscriptions
- —Web3-native applications that can settle payments on Base
Not for
- —High-volume production workloads where bulk/subscription pricing would be cheaper
- —Users without USDC on Base or unfamiliar with crypto payment flows
- —Applications requiring detailed SLAs, guaranteed uptime, or enterprise support
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/item/44 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>" \
-d '{}'Endpoint
Quality
The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base per request). However, the specific endpoint /api/v1/item/44 has no documented input/output schema, no examples, and all documentation pages returned only 'Connect wallet' with no content. The purpose of 'item/44' specifically is unknown. This is effectively a stub listing.
Warnings
- —The exact purpose and schema of /api/v1/item/44 are undocumented — 'Premium API Access' is a generic label with no specifics.
- —All documentation pages (/docs, /pricing, /README) returned only 'Connect wallet' with no substantive content.
- —No OpenAPI spec, no request/response examples, and no detailed endpoint descriptions are available.
- —The platform lists many endpoints but it is unclear whether they all function or are placeholders.
Citations
- —The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Basehttps://lowpaymentfee.com/api/v1/item/44
- —USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base networkhttps://lowpaymentfee.com/api/v1/item/44
- —Platform advertises $0.02/request uniform pricing with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com