Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.
What it does
lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and utility services. All endpoints are paid per-request using USDC on the Base network at a flat rate of $0.02 per call, with no API keys, no rate limits, and no minimum commitments required.
The specific endpoint at `/api/v1/payments/348` is listed as "Premium API Access" and returns a valid x402 challenge requesting up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is made via the x402 exact scheme by including an X-PAYMENT header. The endpoint accepts POST requests and returns application/json.
The broader platform advertises 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 (geocoding, validation, conversion, generation). Documentation pages exist at /docs, /pricing, and /api but currently render only a "Connect wallet" prompt with no substantive content, so detailed request/response schemas for individual endpoints are unavailable.
Capabilities
Use cases
- —Agents that need on-demand AI inference (sentiment, summarization, classification, embeddings) without API key management
- —Fetching real-time crypto token quotes, gas estimates, or exchange rates with per-call payment
- —Running geocoding or data validation utilities with zero setup and pay-as-you-go pricing
- —Exporting analytics data or generating insights reports via programmatic access
Fit
Best for
- —AI agents needing keyless, pay-per-call access to diverse utility endpoints
- —Developers who want to avoid subscription commitments and pay only for usage
- —Web3-native applications that can settle payments in USDC on Base
Not for
- —High-volume batch processing where per-call pricing at $0.02 would be cost-prohibitive
- —Users who need detailed API documentation or guaranteed SLAs (docs are currently sparse)
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/payments/348 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The x402 challenge is live and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI schema, no request/response examples, and all documentation pages render only 'Connect wallet' with no content. The specific functionality behind '/api/v1/payments/348' ('Premium API Access') is vague and undocumented.
Warnings
- —Documentation pages (/docs, /pricing, /api, /README) all render only 'Connect wallet' with no usable content.
- —The specific purpose of /api/v1/payments/348 ('Premium API Access') is not documented — it is unclear what data or service it returns.
- —No OpenAPI spec or request/response schema is available for any endpoint.
- —No information on uptime, SLAs, or rate limits beyond the marketing claim of 'no rate limits'.
Citations
- —Flat pricing of $0.02 per request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —x402 challenge returns maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, equaling $0.02https://lowpaymentfee.com/api/v1/payments/348
- —Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com
- —Documentation pages render only 'Connect wallet' with no substantive contenthttps://lowpaymentfee.com/docs