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 payment protocol on the Base network. This specific endpoint (`/api/v1/customers/73`) is listed as "Premium API Access" and returns JSON data when a valid x402 payment header is supplied. Payment is settled in USDC (contract 0x8335…2913 on Base) with a maximum cost of $0.02 per request (20,000 base units at 6 decimals). No API keys, rate limits, or upfront commitments are required — each call is individually paid.
The broader lowpaymentfee.com platform advertises endpoints across several 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 uniformly priced at $0.02 per request.
The specific `/api/v1/customers/73` endpoint appears to be a customer-record lookup, but the crawled documentation is extremely thin — the docs, API, pricing, and README pages all render only a "Connect wallet" prompt with no further detail. There is no OpenAPI schema, no request/response examples, and no description of what fields the customer object contains. The endpoint is confirmed live (returns a proper 402 challenge), but the lack of documentation makes it difficult to know exactly what data is returned.
Capabilities
Use cases
- —Retrieving customer record data on a per-call payment basis without API key management
- —Integrating pay-as-you-go data access into autonomous agent workflows
- —Accessing structured customer data with crypto-native micropayments
Fit
Best for
- —Agents or services that need on-demand data access without subscription overhead
- —Developers experimenting with x402 payment protocol integrations
- —Use cases requiring keyless, permissionless API access on Base
Not for
- —High-volume bulk data retrieval where per-call pricing becomes expensive
- —Users who need detailed API documentation and response schemas before integration
- —Non-crypto workflows that cannot produce x402 payment headers
Quick start
# Requires an x402-compatible client that can sign USDC payments on Base
curl -X POST https://lowpaymentfee.com/api/v1/customers/73 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <signed-x402-payment-header>"Endpoint
Quality
The endpoint is confirmed live with a valid 402 challenge and clear pricing ($0.02 USDC on Base). However, there is no OpenAPI schema, no request/response examples, and the documentation pages are empty beyond a wallet-connect prompt. The purpose of the /customers/73 endpoint is unclear beyond its title.
Warnings
- —No OpenAPI or schema documentation available — response format is unknown
- —Docs, API, pricing, and README pages all render only 'Connect wallet' with no usable content
- —The specific purpose and fields of /api/v1/customers/73 are undocumented
- —This may be a demo/showcase site rather than a production data provider
Citations
- —Endpoint returns 402 with x402 challenge advertising USDC on Base at maxAmountRequired 20000https://lowpaymentfee.com/api/v1/customers/73
- —All endpoints priced at $0.02 per request with no API keys, no rate limits, instant access on Base networkhttps://lowpaymentfee.com
- —USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/customers/73