Pay-per-call customer data API on Base via x402, settled in USDC at $0.02/request.
What it does
This endpoint at lowpaymentfee.com provides premium API access to a customer resource (customer ID 91) via the x402 payment protocol. It accepts HTTP POST requests and returns JSON. Payment is settled on the Base network using USDC (contract 0x8335…2913) with a maximum cost of 20,000 base units, which equals $0.02 per request (USDC uses 6 decimals).
The broader lowpaymentfee.com platform advertises a suite of pay-per-call APIs spanning 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 $0.02 per request with no API keys, no rate limits, and no minimum commitments.
The specific endpoint probed (/api/v1/customers/91) is not explicitly listed on the landing page's catalog, so its exact response schema and purpose are unclear beyond the generic "Premium API Access" description. Documentation pages (/docs, /pricing, /README) returned only a wallet-connect prompt with no substantive content, so detailed request/response schemas, field definitions, and usage examples are unavailable.
Capabilities
Use cases
- —Fetching customer data records on demand with per-request USDC micropayments
- —Integrating pay-as-you-go data access into agent workflows without API key management
- —Demonstrating x402 protocol payment flows on the Base network
Fit
Best for
- —Developers experimenting with x402 pay-per-call protocols
- —Agents needing keyless, on-demand API access settled in USDC
- —Low-volume or sporadic data retrieval where subscription pricing is wasteful
Not for
- —High-volume bulk data retrieval where per-call costs add up quickly
- —Use cases requiring detailed API documentation, SLAs, or guaranteed uptime
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/customers/91 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is live and returns a valid x402 402 challenge, confirming it works. However, the specific /customers/91 resource is not documented on the site, no response schema or example is available, and all documentation pages returned only a wallet-connect stub with no content. The listing is essentially a stub with pricing and protocol details only.
Warnings
- —The /api/v1/customers/91 endpoint is not listed in the site's public API catalog — its purpose and response format are unknown.
- —All documentation pages (/docs, /pricing, /README) returned no substantive content, only a wallet-connect prompt.
- —No OpenAPI spec, request schema, or response schema is available.
- —No information on rate limits, uptime guarantees, or data freshness is provided.
Citations
- —The endpoint returns a 402 x402 challenge requesting USDC payment on Base network with maxAmountRequired of 20000 base unitshttps://lowpaymentfee.com/api/v1/customers/91
- —USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/customers/91
- —All listed APIs are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —The platform offers APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com