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 upfront commitments. The specific endpoint at `/api/v1/orders/65` is labeled "Premium API Access" and returns `application/json` via POST.
The platform advertises four endpoint 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). All are listed at the same $0.02 price point.
The probed endpoint (`/api/v1/orders/65`) returned a valid x402 challenge with `maxAmountRequired` of 20000 base units of USDC (0x8335… on Base, 6 decimals), which equals $0.02. Payment is sent to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using the "exact" scheme. The endpoint is live and responds correctly to the x402 protocol. Documentation pages beyond the landing page were essentially empty (showing only "Connect wallet"), so details about request/response schemas for individual endpoints are unavailable.
Capabilities
Use cases
- —Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key management
- —Fetching real-time finance data like token quotes, gas estimates, and exchange rates on a per-call basis
- —Running data analytics queries and exporting data with per-request billing
- —Using utility services like geocoding, validation, and conversion with zero setup
Fit
Best for
- —Agents or developers who want instant, keyless API access paid in USDC
- —Low-volume or bursty workloads where per-request pricing avoids subscription waste
- —Web3-native applications that can settle payments on Base
Not for
- —High-volume production workloads where $0.02/request adds up quickly without volume discounts
- —Users who need detailed API documentation, SDKs, or OpenAPI specs before integrating
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/orders/65 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is live and returns a valid x402 challenge, and the landing page lists available endpoints with pricing. However, there is no OpenAPI spec, no documentation beyond the landing page, no request/response schema examples, and the specific purpose of /api/v1/orders/65 ("Premium API Access") is unclear. Most doc pages returned only "Connect wallet" with no content.
Warnings
- —No OpenAPI or schema documentation available for any endpoint
- —Documentation pages (/docs, /api, /pricing, /README) are effectively empty — only show 'Connect wallet'
- —The specific function of /api/v1/orders/65 ('Premium API Access') is not explained anywhere; it does not match any of the advertised endpoint paths
- —Request and response body formats are unknown — no examples or schemas provided
Citations
- —All endpoints cost $0.02 per request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —The platform offers endpoints in four categories: Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructurehttps://lowpaymentfee.com
- —x402 challenge returned maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Basehttps://lowpaymentfee.com/api/v1/orders/65