Pay-per-call customer data API on Base via x402, settled in USDC at $0.02/request.
What it does
lowpaymentfee.com hosts a collection of pay-per-request APIs accessible via the x402 protocol on the Base network. The specific endpoint `/api/v1/customers/5` is described as "Premium API Access" and returns JSON. Payment is settled in USDC (contract 0x8335…2913 on Base) with a maximum amount of 20,000 base units, which at 6 decimals equals $0.02 per request. No API keys, rate limits, or upfront commitments are required — callers simply attach an x402 payment header to each POST request.
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 utilities (geocoding, validation, conversion, generation). All endpoints are listed at the same $0.02/request price point.
The specific `/api/v1/customers/5` endpoint does not clearly map to any of the advertised categories, and no documentation, request schema, or response schema is available beyond the x402 challenge. The docs, pricing, and API pages on the site all render only a "Connect wallet" prompt with no further content. Callers should expect a JSON response but the exact fields and request body format are unknown.
Capabilities
Use cases
- —Fetching customer data records on demand with per-call USDC micropayments
- —Integrating pay-as-you-go data access into agent workflows without API key management
- —Demonstrating x402 protocol payment flows on Base
Fit
Best for
- —Developers experimenting with x402 protocol payments
- —Agents needing keyless, pay-per-call data access on Base
- —Low-volume consumers who want no subscription or commitment
Not for
- —High-volume bulk data retrieval where per-call fees add up
- —Users who need detailed API documentation and guaranteed SLAs
- —Anyone without a Base-compatible USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/customers/5 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is live and returns a valid x402 challenge with clear pricing, but there is no OpenAPI schema, no request/response examples, and the docs pages are empty beyond a wallet-connect prompt. The purpose of the /customers/5 endpoint is unclear and doesn't match any advertised category. Effectively a stub listing.
Warnings
- —No request or response schema available — callers must discover the expected body format experimentally
- —Documentation pages (/docs, /pricing, /api, /README) all render only 'Connect wallet' with no usable content
- —The /api/v1/customers/5 endpoint is not listed among the site's advertised APIs; its actual functionality is unknown
- —No OpenAPI spec or ai-plugin manifest found
Citations
- —The x402 challenge returns maxAmountRequired of 20000 in USDC (6 decimals) on Base, equaling $0.02https://lowpaymentfee.com/api/v1/customers/5
- —USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/customers/5
- —All listed endpoints are priced at $0.02/request with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —The site advertises APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com