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/187` 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 categories including 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). However, documentation pages beyond the landing page returned only a "Connect wallet" prompt with no actual API docs, schemas, or example payloads. The exact functionality of the `/api/v1/transactions/187` endpoint specifically is unclear from available material.
Capabilities
Use cases
- —Accessing data analytics and reports on a per-request basis without subscriptions
- —Running AI inference tasks (sentiment, summarization, classification, embeddings) with per-call payment
- —Fetching real-time crypto and finance data (prices, gas estimates, exchange rates)
- —Using utility services like geocoding and data validation without API key management
Fit
Best for
- —Agents and developers who want zero-setup, keyless API access
- —Low-volume or bursty workloads where per-request pricing is more economical than subscriptions
- —Crypto-native applications already operating on the Base network
Not for
- —High-volume production workloads where per-request costs add up quickly
- —Users who need detailed API documentation, schemas, or SLAs before integrating
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/transactions/187 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is live and returns a valid x402 402 challenge, confirming pricing and payment details. However, there is no OpenAPI schema, no request/response examples, and all documentation pages beyond the landing page are empty ('Connect wallet' only). The specific purpose of /api/v1/transactions/187 is not documented. This is effectively a stub listing.
Warnings
- —No API documentation available — all doc pages return only 'Connect wallet' with no content
- —The specific functionality of /api/v1/transactions/187 ('Premium API Access') is undocumented
- —No request or response schemas are provided for any endpoint
- —No examples, error codes, or rate limit information available
Citations
- —All endpoints priced at $0.02/request with no API keys, no rate limits, 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/187
- —Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com