Pay-per-call API platform on Base via x402 — data, AI, finance, and utility endpoints at $0.02/request.
What it does
lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of pay-per-request 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 utilities (geocoding, validation, conversion, generation). All endpoints are priced at $0.02 per request, paid in USDC on the Base network via the x402 protocol.
The specific endpoint at `/api/v1/transfers/95` 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. Payment is made by including an X-PAYMENT header with each request — no API keys, accounts, or rate limits are required. The x402 challenge specifies the "exact" payment scheme with a 300-second timeout.
Documentation is extremely sparse. The landing page lists available endpoints and pricing, but the /docs, /pricing, /api, and /README pages all render only a "Connect wallet" prompt with no additional content. There is no OpenAPI specification, no request/response schema documentation, and no usage examples. It is unclear what data or functionality the `/api/v1/transfers/95` endpoint specifically returns, as the description is generic ("Premium API Access") and does not match any of the named categories on the homepage.
Capabilities
Use cases
- —Accessing AI inference (sentiment, summarization, classification, embeddings) without signup or API keys
- —Fetching real-time financial data (prices, exchange rates, gas estimates) on a per-call basis
- —Running utility operations (geocoding, validation, conversion) with instant crypto micropayments
- —Integrating pay-per-use data analytics into agent workflows
Fit
Best for
- —Developers who want instant API access without account creation
- —AI agents that can settle payments via x402 on Base
- —Projects needing low-cost, no-commitment API calls at $0.02 each
Not for
- —Users who need detailed API documentation or OpenAPI specs before integrating
- —Applications requiring high-volume bulk pricing or subscription plans
- —Developers who cannot transact in USDC on the Base network
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/transfers/95 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI schema, no request/response documentation, no examples, and the specific endpoint's purpose ('Premium API Access' at /transfers/95) is ambiguous and doesn't map to any named service on the homepage. Docs pages are empty.
Warnings
- —No OpenAPI or schema documentation available — all docs pages render only 'Connect wallet'
- —The endpoint path /api/v1/transfers/95 does not match any of the named endpoints on the homepage; its actual functionality is unknown
- —No request body schema or response format documented anywhere
- —No examples of successful responses available
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/transfers/95
- —Available API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructurehttps://lowpaymentfee.com
- —Docs, pricing, API, and README pages render only 'Connect wallet' with no additional contenthttps://lowpaymentfee.com/docs