Pay-per-request API platform on Base network via x402 — $0.02/call in USDC.
What it does
lowpaymentfee.com is an x402-enabled API platform that offers a broad collection of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities. All endpoints are pay-per-request at $0.02 each, settled in USDC on the Base network. No API keys, accounts, or rate limits are required — callers simply attach an x402 payment header to each request.
The specific endpoint `/api/v1/policies/100` is listed as "Premium API Access" and returns an x402 challenge requesting up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The payment scheme is "exact" with a 300-second timeout. 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 the actual request/response schemas for individual endpoints are unknown.
Capabilities
Use cases
- —Agents needing 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, data validation, or format conversion as utility calls from automated workflows
- —Exporting analytics data or generating insights reports on a pay-as-you-go basis
- —Demonstrating or testing x402 payment protocol integrations at low cost
Fit
Best for
- —AI agents that need keyless, pay-per-request access to diverse utility endpoints
- —Developers prototyping x402 payment flows on Base
- —Applications requiring low-cost micropayment-gated API calls without subscriptions
Not for
- —High-volume production workloads where per-request pricing adds up (no bulk discounts documented)
- —Users who need detailed API documentation or guaranteed SLAs (docs pages are currently empty)
- —Applications requiring non-USDC or non-Base-network payment settlement
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/policies/100 \
-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), but there is no OpenAPI schema, no documented request/response formats, and all documentation pages render only 'Connect wallet' with no content. The specific endpoint '/api/v1/policies/100' has a generic 'Premium API Access' description with no indication of what data it actually returns. Effectively a stub listing.
Warnings
- —Documentation pages (/docs, /pricing, /api, /README) all render only 'Connect wallet' with no usable content
- —No OpenAPI or schema available — request and response formats for all endpoints are unknown
- —The endpoint name 'Premium API Access' and path '/api/v1/policies/100' give no clear indication of what data is returned
- —Cannot verify that the advertised AI, finance, and utility endpoints actually function — only the /api/v1/policies/100 endpoint was probed
Citations
- —The platform lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories, all at $0.02/requesthttps://lowpaymentfee.com
- —Pricing is $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/policies/100