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/29` 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 was successfully captured (HTTP 402 with version 1 challenge), confirming the endpoint is live. The payment is sent 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 doc/pricing/API pages only show a "Connect wallet" prompt), so the actual behavior, request schemas, and response formats for individual endpoints are unknown.
Capabilities
Use cases
- —Agent-driven data retrieval without pre-registration or API keys
- —On-demand AI inference (sentiment, summarization, classification, embeddings) paid per call
- —Fetching real-time crypto gas estimates or token quotes via micropayment
- —Geocoding or data conversion as a utility microservice
Fit
Best for
- —AI agents needing frictionless, keyless API access
- —Developers who want pay-as-you-go pricing without subscriptions
- —x402-compatible clients on the Base network
Not for
- —Users who need detailed API documentation or guaranteed SLAs
- —High-volume batch processing where per-request pricing adds up
- —Users without USDC on Base network
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/transactions/29 \
-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), but there is no documentation, no OpenAPI schema, no request/response examples, and no indication of what this specific '/transactions/29' endpoint actually returns. The docs, pricing, and API pages are all blank beyond a wallet-connect prompt.
Warnings
- —No API documentation available — all doc pages render only 'Connect wallet'
- —No OpenAPI or schema definition found for any endpoint
- —The specific endpoint '/api/v1/transactions/29' labeled 'Premium API Access' has no description of its input/output beyond the generic title
- —Actual functionality behind the listed AI, finance, and utility endpoints is unverifiable from crawled content
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/29
- —Platform advertises endpoints for analytics, AI/ML, finance/Web3, and infrastructure utilitieshttps://lowpaymentfee.com