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/products/64` is listed as "Premium API Access" and charges up to 20,000 base units of USDC (i.e., $0.02) per call. No API keys or rate limits are advertised — callers simply attach an x402 payment header to each request.
The platform organizes its endpoints into 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 listed endpoints share the same $0.02/request pricing.
Documentation is extremely sparse. The docs, API, pricing, and README pages all render only a "Connect wallet" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no detailed description of what the `/api/v1/products/64` endpoint actually returns. The x402 challenge confirms the endpoint is live and accepts POST requests, but the actual payload format and response structure are unknown.
Capabilities
Use cases
- —Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key management
- —Fetching real-time finance data like token quotes, gas estimates, and exchange rates on a per-call basis
- —Running utility operations like geocoding, validation, and data conversion with instant crypto-settled payments
Fit
Best for
- —Agents or apps that need low-friction, keyless API access settled in USDC on Base
- —Developers prototyping with multiple API categories (AI, finance, data) under a single payment model
- —Micropayment use cases where $0.02 per request is cost-effective
Not for
- —Production workloads requiring documented request/response schemas and SLAs
- —Users who need non-crypto payment methods or fiat billing
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/products/64 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-header>"Endpoint
Quality
The x402 challenge confirms the endpoint is live and pricing is clear ($0.02 USDC on Base), but there is zero documentation beyond the landing page catalog. No OpenAPI spec, no request/response schemas, no examples, and all doc pages render only 'Connect wallet'. The purpose of /api/v1/products/64 specifically is unclear beyond the generic label 'Premium API Access'.
Warnings
- —No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet'
- —No OpenAPI or request/response schema provided for any endpoint
- —The specific purpose and payload format of /api/v1/products/64 is undocumented
- —Cannot verify what data or functionality is actually returned by this endpoint
Citations
- —The endpoint charges up to 20,000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network, equivalent to $0.02https://lowpaymentfee.com/api/v1/products/64
- —The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —Available API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure utilitieshttps://lowpaymentfee.com
- —Docs, API, pricing, and README pages render only 'Connect wallet' with no further contenthttps://lowpaymentfee.com/docs