Pay-per-request API platform on Base via x402 — data, AI, finance, and utility endpoints at $0.02/call.
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.
The specific endpoint at `/api/v1/customers/33` is listed as "Premium API Access" and returns a 402 challenge requesting up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02. Payment is made via the x402 exact scheme with no API keys or rate limits required. The endpoint accepts POST requests and returns application/json.
Documentation is extremely sparse — the /docs, /pricing, /api, and /README pages all render only a "Connect wallet" prompt with no further content. There is no OpenAPI spec, no request/response schema documentation, and no examples of what the `/api/v1/customers/33` endpoint actually returns. The endpoint's purpose ("Premium API Access") is vague and does not clearly map to any of the four advertised categories. Without documentation or example responses, the actual functionality of this specific endpoint is unknown.
Capabilities
Use cases
- —Accessing on-demand API services without subscription or API key management
- —Paying per request with USDC on Base for data, AI, or utility endpoints
- —Agent-driven API consumption with x402 payment protocol
Fit
Best for
- —Developers wanting zero-commitment pay-per-use API access
- —AI agents that can settle x402 payments autonomously
- —Users who prefer crypto micropayments over traditional billing
Not for
- —Users needing detailed API documentation or schemas before integrating
- —High-volume consumers who need bulk pricing or rate guarantees
- —Anyone without a Base-compatible USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/customers/33 \
-H "X-PAYMENT: <x402-payment-token>" \
-H "Content-Type: application/json"Endpoint
Quality
The endpoint is live and returns a valid x402 402 challenge, confirming it accepts USDC payments on Base at $0.02. However, there is no OpenAPI spec, no request/response documentation, no examples, and the docs pages are empty. The specific endpoint's purpose ('Premium API Access' at /api/v1/customers/33) is unclear and doesn't match any advertised category. This is effectively a stub listing.
Warnings
- —No documentation available — /docs, /pricing, /api, and /README pages all show only 'Connect wallet'
- —No OpenAPI or schema definition found
- —The endpoint /api/v1/customers/33 ('Premium API Access') does not clearly correspond to any of the advertised API categories
- —No request body schema or response schema documented — actual functionality is unknown
- —No examples of successful responses available
Citations
- —All endpoints priced at $0.02 per request with no API keys, no rate limits, on Base networkhttps://lowpaymentfee.com
- —Endpoint returns 402 challenge requesting maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Basehttps://lowpaymentfee.com/api/v1/customers/33
- —Categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructurehttps://lowpaymentfee.com
- —Docs, pricing, API, and README pages render only 'Connect wallet'https://lowpaymentfee.com/docs