Pay-per-call API platform on Base via x402 — $0.02/request for data, AI, finance, and utility endpoints.
What it does
lowpaymentfee.com is an x402-enabled API platform that offers a collection of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and general utility services. All endpoints are priced at $0.02 per request, paid in USDC on the Base network with no API keys, rate limits, or subscriptions required.
The specific endpoint at `/api/v1/charges/77` is listed as "Premium API Access" and accepts POST requests. The x402 challenge confirms it is live, requesting up to 20,000 base units of USDC (0.02 USDC, i.e., $0.02) per call on Base. Payment is made via the x402 exact scheme to the specified wallet address. The response MIME type is application/json.
The broader platform advertises endpoints across 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 visible content. No OpenAPI schema, request/response examples, or detailed endpoint documentation were found in the crawl.
Capabilities
Use cases
- —Agents needing on-demand AI inference (sentiment, summarization, classification, embeddings) without API key management
- —Fetching real-time financial data such as token prices, exchange rates, and gas estimates via micropayment
- —Running data analytics queries and exporting reports with per-request billing
- —Geocoding, validation, and data conversion as utility microservices
Fit
Best for
- —AI agents that need keyless, pay-per-use access to diverse API endpoints
- —Developers prototyping with low-commitment, no-subscription API access
- —Web3-native applications already operating on the Base network
Not for
- —High-volume production workloads where per-request pricing at $0.02 adds up significantly
- —Users who need detailed API documentation, schemas, or SLAs before integration
- —Applications that cannot handle x402 payment flows or USDC on Base
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/charges/77 \
-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 there is no OpenAPI schema, no request/response examples, and documentation pages are empty (wallet-gated). The specific purpose of the /charges/77 endpoint beyond 'Premium API Access' is unclear. Effectively a stub listing.
Warnings
- —No OpenAPI or endpoint schema available — request and response formats are unknown
- —Documentation pages (/docs, /api, /pricing, /README) returned no useful content beyond 'Connect wallet'
- —The specific function of /api/v1/charges/77 ('Premium API Access') is not documented; it may be a generic or placeholder endpoint
- —No rate limit, SLA, or uptime information provided
Citations
- —All endpoints priced at $0.02 per request with no API keys, rate limits, or minimumshttps://lowpaymentfee.com
- —Endpoint categories include Data & Analytics, AI & ML, Finance & Web3, and Infrastructurehttps://lowpaymentfee.com
- —x402 challenge returns 402 with maxAmountRequired of 20000 base units USDC on Base (= $0.02)https://lowpaymentfee.com/api/v1/charges/77
- —Payment asset is USDC at contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/charges/77