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/99`) is described 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 20,000 base units, which equals $0.02 per request (USDC uses 6 decimals). No API keys or rate limits are advertised; access is gated entirely by the on-chain micropayment.
The broader lowpaymentfee.com platform offers endpoints across several categories—data & analytics, AI/ML inference (sentiment, summarization, classification, embeddings), finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation)—all priced at $0.02 per call. However, this listing covers only the `/api/v1/customers/99` endpoint, which appears to be a customer-record lookup. The exact schema of the response body is not documented; the x402 challenge confirms the output MIME type is `application/json` and the HTTP method is POST.
Documentation on the site is extremely thin—most pages beyond the landing page render only a "Connect wallet" prompt with no further content. There is no OpenAPI spec, no example request/response payloads, and no detailed field-level documentation available from the crawl. The endpoint is confirmed live (402 challenge captured successfully).
Capabilities
Use cases
- —Retrieving customer record data on demand with per-call USDC micropayments
- —Agent-driven data retrieval without pre-provisioned API keys
- —Integrating pay-as-you-go customer data into automated workflows
Fit
Best for
- —Developers or agents needing keyless, pay-per-call API access
- —Use cases where on-chain USDC micropayments on Base are preferred over subscriptions
- —Prototyping or low-volume access to customer data without signup
Not for
- —High-volume bulk data retrieval where per-call costs add up
- —Users who cannot transact in USDC on the Base network
- —Applications requiring detailed API documentation or SLAs
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/customers/99 \
-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 spec, no request/response schema, and documentation pages are empty beyond the landing page. The purpose of the /customers/99 endpoint is unclear beyond its generic title.
Warnings
- —No OpenAPI or schema documentation available; response format is unknown
- —All documentation pages beyond the landing page return only a 'Connect wallet' prompt with no content
- —The specific purpose and data returned by /api/v1/customers/99 is undocumented
- —No example requests or responses are available from the provider
Citations
- —The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units in USDC on Basehttps://lowpaymentfee.com/api/v1/customers/99
- —All APIs are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/customers/99