Pay-per-call customer data API on Base via x402 — $0.02/request in USDC.
What it does
This endpoint at lowpaymentfee.com provides access to a "Premium API Access" resource at the path `/api/v1/customers/44`. It is part of a broader platform offering dozens of pay-per-request APIs spanning data & analytics, AI/ML inference, finance & Web3 data, and infrastructure utilities — all settled via the x402 protocol on the Base network using USDC.
The specific endpoint `/api/v1/customers/44` accepts POST requests and returns JSON. The x402 challenge advertises a maximum cost of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 per request (USDC uses 6 decimals). Payment is made inline via the X-PAYMENT header with no API keys, no rate limits, and no upfront commitments. The payment timeout is 300 seconds.
Documentation on the site is extremely thin — the /docs, /pricing, /api, and /README pages all render only a "Connect wallet" prompt with no additional technical detail. There is no OpenAPI spec, no request/response schema beyond the x402 outputSchema stub, and no description of what the `/api/v1/customers/44` resource actually returns. The endpoint is confirmed live (402 challenge captured), but the lack of documentation makes it difficult to know what data or functionality is behind this particular path.
Capabilities
Use cases
- —Fetching customer record data 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 Base
Fit
Best for
- —Developers experimenting with x402 pay-per-call patterns
- —Agents that need keyless, on-demand API access settled in USDC on Base
- —Low-volume or sporadic data retrieval where subscription pricing is wasteful
Not for
- —High-volume bulk data retrieval where per-request fees add up quickly
- —Users who need detailed API documentation or guaranteed SLAs before integrating
- —Anyone without a Base-compatible USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/customers/44 \
-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 no meaningful documentation — every doc page just shows 'Connect wallet'. The purpose of /api/v1/customers/44 is unexplained.
Warnings
- —No OpenAPI or schema documentation available — request body and response format are unknown
- —All documentation pages (/docs, /pricing, /api, /README) render only 'Connect wallet' with no content
- —The specific resource '/api/v1/customers/44' has no description beyond the generic 'Premium API Access' label
- —Cannot verify what data is actually returned by this endpoint
Citations
- —The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Basehttps://lowpaymentfee.com/api/v1/customers/44
- —The USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/customers/44
- —The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —The site offers APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com