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/193` is listed as "Premium API Access" and advertises a maximum cost of 20,000 base units of USDC (0.02 USDC, i.e., $0.02) per call. The x402 challenge confirms the endpoint is live, accepts the `exact` payment scheme on Base, and pays out to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3`. The asset contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913` is Base-native USDC.
The broader platform advertises categories including metrics, reports, data export, insights, sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and generation endpoints — all at the same $0.02 price point. However, documentation pages (docs, pricing, README) returned only a "Connect wallet" prompt with no substantive content, so the actual behavior, request/response schemas, and data sources behind these endpoints remain undocumented and unverified.
Capabilities
Use cases
- —Agents needing on-demand API access without pre-registration or API keys
- —Pay-per-use data analytics and reporting
- —Lightweight AI inference (sentiment, summarization, classification, embeddings)
- —Fetching crypto gas estimates, token quotes, or exchange rates
- —Geocoding and data conversion utilities
Fit
Best for
- —AI agents that need frictionless, keyless API access via x402
- —Developers prototyping with low-cost, no-commitment API calls
- —Web3-native applications already operating on Base
Not for
- —High-volume production workloads needing SLAs or guaranteed uptime
- —Users who need detailed API documentation or response schema guarantees
- —Applications requiring non-USDC or non-Base payment rails
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/transactions/193 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The x402 challenge is live and confirms pricing and payment details, but documentation pages are empty (only 'Connect wallet'). No OpenAPI spec, no request/response schemas, and no examples are available. The actual functionality behind 'Premium API Access' and the other listed endpoints is unverifiable from the crawl material.
Warnings
- —Documentation pages (/docs, /pricing, /README) contain no substantive content — only a 'Connect wallet' prompt.
- —No OpenAPI spec or request/response schema is available for any endpoint.
- —The specific purpose of /api/v1/transactions/193 ('Premium API Access') is unclear — it may be a generic or placeholder endpoint.
- —The broad catalog of endpoints (AI, finance, analytics, utilities) is advertised but none could be verified for actual functionality.
- —No information on data sources, model providers, or accuracy guarantees for AI/finance endpoints.
Citations
- —All endpoints priced at $0.02 per request with no API keys, no rate limits, instant access on Base networkhttps://lowpaymentfee.com
- —x402 challenge returns 402 with maxAmountRequired 20000 USDC (0.02 USD) on Base networkhttps://lowpaymentfee.com/api/v1/transactions/193
- —Asset contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 is Base USDChttps://lowpaymentfee.com
- —Platform advertises endpoints for analytics, AI/ML, finance/Web3, and infrastructure utilitieshttps://lowpaymentfee.com