Pay-per-request API platform on Base network via x402 — $0.02/call 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. Every endpoint costs $0.02 per request, paid in USDC on the Base network with no API keys, no rate limits, and no commitments required. The x402 protocol handles payment inline: callers attach a payment header and the server fulfills the request upon verification.
The specific endpoint at `/api/v1/orders/40` is listed as "Premium API Access" and returns an x402 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 but appear to require wallet connection and contain no substantive content, so the actual request/response schemas for individual endpoints are unknown.
Capabilities
Use cases
- —Agents that need on-demand AI inference (sentiment, summarization, classification) without managing API keys
- —Fetching real-time crypto token quotes and gas estimates with per-call payment
- —Geocoding or data validation as a utility service paid in USDC on Base
- —Exporting analytics data or generating reports with no subscription commitment
Fit
Best for
- —AI agents with Base USDC wallets needing low-friction API access
- —Developers who want pay-as-you-go pricing without signup or rate limits
- —Web3-native applications that prefer on-chain payment settlement
Not for
- —High-volume production workloads where $0.02/request adds up significantly
- —Users without a Base network USDC wallet or x402-compatible client
- —Applications requiring detailed API documentation or guaranteed SLAs
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/orders/40 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-header>"Endpoint
Quality
The x402 challenge is live and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI schema, no documentation content (all doc pages just show 'Connect wallet'), no request/response examples, and the specific purpose of the /api/v1/orders/40 endpoint beyond 'Premium API Access' is unknown. The listing is effectively a stub with confirmed liveness.
Warnings
- —No API documentation available — all doc/pricing/README pages require wallet connection and show no content
- —The specific endpoint /api/v1/orders/40 has no description beyond 'Premium API Access'; its actual functionality is unclear
- —No OpenAPI spec or request/response schema provided
- —The platform lists many endpoints but none have documented input/output contracts
Citations
- —Platform offers endpoints at $0.02/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/orders/40
- —Endpoint categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructurehttps://lowpaymentfee.com