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 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 at `/api/v1/transactions/345` is listed as "Premium API Access" and returns a 402 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 but appear to require a wallet connection to view, so detailed request/response schemas for individual endpoints are not available from the crawl.
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 via a single paid call
- —Geocoding or data validation as a utility microservice with no subscription commitment
- —Exporting analytics data or generating insights reports on a per-request basis
Fit
Best for
- —AI agents that need diverse utility endpoints behind a single payment protocol
- —Developers who want zero-signup, pay-as-you-go API access on Base
- —Low-volume or bursty workloads where per-request pricing is more economical than subscriptions
Not for
- —High-volume production workloads where $0.02/request adds up quickly compared to bulk-priced alternatives
- —Users who need detailed SLAs, uptime guarantees, or enterprise support
- —Callers without a Base-network USDC wallet or x402-compatible client
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/transactions/345 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The x402 challenge is live and well-formed, confirming the endpoint works and pricing is clear ($0.02 USDC on Base). However, documentation pages all resolve to a 'Connect wallet' stub, so there are no request/response schemas, no OpenAPI spec, and no concrete examples of what this specific endpoint actually returns. The endpoint path '/api/v1/transactions/345' with description 'Premium API Access' is generic and doesn't clarify its function.
Warnings
- —Documentation pages require wallet connection and provide no readable content from crawl
- —The specific function of /api/v1/transactions/345 is unclear — 'Premium API Access' is a generic label
- —No OpenAPI spec, request schema, or response schema available
- —No concrete examples of request bodies or response payloads could be obtained
Citations
- —All endpoints priced at $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, scheme exact, 300s timeouthttps://lowpaymentfee.com/api/v1/transactions/345
- —Platform offers endpoints in Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com