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 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 at `/api/v1/transactions/224` 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 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
- —Agent-driven data retrieval without API key management
- —On-demand AI inference (sentiment, summarization, classification, embeddings) paid per call
- —Fetching real-time crypto prices, gas estimates, and exchange rates
- —Geocoding and data validation utilities with no subscription commitment
- —Programmatic data export and analytics with micropayments
Fit
Best for
- —AI agents that need keyless, pay-as-you-go API access
- —Developers prototyping with low-commitment per-request pricing
- —Web3-native applications already operating on Base network
Not for
- —High-volume production workloads where per-request pricing becomes expensive
- —Users without USDC on Base network or an x402-compatible client
- —Applications requiring detailed SLAs, guaranteed uptime, or support contracts
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/transactions/224 \
-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 documented request/response formats, and all documentation pages render only 'Connect wallet' with no content. The specific purpose of /api/v1/transactions/224 ('Premium API Access') is vague and undifferentiated from the rest of the catalog. Effectively a stub listing.
Warnings
- —Documentation pages (/docs, /pricing, /api, /README) all render only 'Connect wallet' with no actual content
- —No OpenAPI or schema available — request and response formats for this endpoint are completely unknown
- —The endpoint path '/api/v1/transactions/224' with description 'Premium API Access' is generic and its specific function is unclear
- —No information on uptime, SLAs, rate limits, or data sources
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, equaling $0.02https://lowpaymentfee.com/api/v1/transactions/224
- —Platform offers endpoints in Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com