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/15`) is described by the provider as "Premium API Access" and returns JSON. Payment is settled in USDC (contract 0x8335…2913 on Base) using the x402 exact-payment scheme.
The x402 challenge captured from the endpoint confirms it is live, accepting POST requests with a maxAmountRequired of 20,000 base units. Since USDC uses 6 decimals, this translates to $0.02 per request — consistent with the site-wide pricing of $0.02/request advertised on the landing page. The provider advertises no API keys, no rate limits, and instant access.
The broader lowpaymentfee.com platform also offers endpoints for analytics/metrics, AI inference (sentiment, summarization, classification, embeddings), finance/crypto data, and utility services, all at the same $0.02 price point. However, this listing covers only the `/api/v1/customers/15` endpoint. Documentation pages (/docs, /pricing, /README) returned minimal content (just a "Connect wallet" prompt), so the request/response schema for this specific endpoint is unknown beyond the fact that it accepts POST and returns application/json.
Capabilities
Use cases
- —Retrieving customer record data on a per-call payment basis without needing an API key
- —Agent-driven workflows that need to fetch structured customer information and pay per request
- —Demonstrating x402 payment protocol integration for data access
Fit
Best for
- —Developers experimenting with x402 pay-per-call patterns
- —AI agents that need keyless, on-demand data access settled in USDC
- —Low-volume or sporadic API consumers who prefer no subscriptions
Not for
- —High-volume bulk data retrieval where per-call costs add up
- —Use cases requiring detailed API documentation or guaranteed SLAs
- —Users without a Base-network USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/customers/15 \
-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. However, there is no OpenAPI schema, no documentation of request/response payloads, and the docs/pricing/README pages are empty stubs. The purpose of the '/customers/15' resource is unclear beyond the generic 'Premium API Access' label.
Warnings
- —No request or response schema available — the input/output format for /api/v1/customers/15 is undocumented.
- —Documentation pages (/docs, /pricing, /README) returned only 'Connect wallet' with no actual content.
- —The endpoint path '/api/v1/customers/15' with a hardcoded ID is unusual; it is unclear whether this is a demo resource or a real data endpoint.
- —The broader platform lists many endpoint categories (AI, finance, analytics) but none match this specific customers endpoint, raising questions about its purpose.
Citations
- —The x402 challenge returns maxAmountRequired of 20000 base units in USDC on Base networkhttps://lowpaymentfee.com/api/v1/customers/15
- —Site-wide pricing is $0.02 per request with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/customers/15