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 set 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, rate limits, or subscriptions are required — callers simply attach an x402 payment header to each request.
The specific endpoint at `/api/v1/transactions/381` is listed as "Premium API Access" and advertises a maximum cost of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The x402 challenge confirms the endpoint is live, accepts POST requests, and returns application/json. The payment is settled to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout.
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 — all at the same $0.02 price point. However, documentation beyond the landing page is essentially empty (all sub-pages just show "Connect wallet"), so the actual behavior, request schemas, and response formats for individual endpoints are undocumented. The specific functionality behind the `/api/v1/transactions/381` path is unclear from available materials.
Capabilities
Use cases
- —Accessing pay-per-call API endpoints without managing API keys or subscriptions
- —Making on-demand requests to data, AI, finance, or utility services with USDC micropayments
- —Integrating x402-compatible agent workflows that settle per-request on Base
Fit
Best for
- —Developers wanting zero-commitment, pay-as-you-go API access
- —AI agents with x402 payment capability on Base
- —Projects needing low-friction API access without signup
Not for
- —Users who need detailed API documentation or guaranteed SLAs
- —High-volume use cases where per-request pricing may add up compared to subscription plans
- —Users without USDC on Base network
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/transactions/381 \
-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 is effectively nonexistent — all doc/pricing/API pages render only 'Connect wallet'. The specific functionality of /api/v1/transactions/381 is undescribed, and no request/response schemas are available. This is essentially a stub listing with a working payment gate.
Warnings
- —Documentation pages (/docs, /api, /pricing, /README) are all empty, showing only 'Connect wallet'
- —The specific functionality of /api/v1/transactions/381 ('Premium API Access') is not documented anywhere
- —No OpenAPI spec, request schema, or response schema available
- —No examples of actual API responses are provided
- —The broad catalog of endpoints listed on the homepage cannot be verified for actual functionality
Citations
- —All endpoints priced at $0.02 per request with no API keys, rate limits, or minimumshttps://lowpaymentfee.com
- —x402 challenge returns maxAmountRequired of 20000 base units of USDC on Base (equals $0.02)https://lowpaymentfee.com/api/v1/transactions/381
- —Payment settled to 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with 300-second timeouthttps://lowpaymentfee.com/api/v1/transactions/381
- —Platform advertises categories: Data & Analytics, AI & Machine Learning, Finance & Web3, Infrastructurehttps://lowpaymentfee.com