x402-gated premium API endpoint on Base, pay-per-call with USDC.
What it does
This endpoint at `/api/v1/ehr/44` is part of the lowpaymentfee.com platform, a collection of x402-protocol pay-per-request APIs spanning data analytics, AI/ML inference, finance, crypto, and utility services. The specific `/api/v1/ehr/44` path is labeled "Premium API Access" but its exact functionality is not documented on the provider's site — the "ehr" prefix may suggest electronic health records or a similar domain, but this is unconfirmed. The endpoint is live and returns a valid x402 challenge.
Payment is settled on the Base network using USDC (contract `0x8335…2913`). The `maxAmountRequired` is 20,000 base units, which at 6 decimals equals $0.02 per request. The platform advertises uniform $0.02/request pricing across all endpoints, no API keys, no rate limits, and instant access. The x402 scheme is "exact" with a 300-second payment timeout.
Documentation is extremely thin — the docs, pricing, API, and README pages all render only a "Connect wallet" prompt with no substantive content. There is no OpenAPI spec, no request/response schema, and no description of what data this endpoint actually returns. The `outputSchema` in the challenge only specifies that the input method is HTTP POST. Without knowing what `/api/v1/ehr/44` returns, callers should treat this as an exploratory integration.
Capabilities
Use cases
- —Accessing premium data behind a per-request USDC paywall
- —Agent-driven API consumption without pre-registration or API keys
- —Programmatic pay-as-you-go data retrieval on Base L2
Fit
Best for
- —Developers wanting zero-signup, pay-per-call API access
- —AI agents with x402-compatible payment capabilities
- —Users who prefer crypto micropayments over subscription billing
Not for
- —Anyone needing detailed documentation or guaranteed SLAs before integration
- —Use cases requiring free or OAuth-authenticated endpoints
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/ehr/44 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-header>"Endpoint
Quality
The endpoint is live and returns a valid x402 challenge, but there is zero documentation on what /api/v1/ehr/44 actually does or returns. No OpenAPI spec, no request/response examples, and the docs pages are empty. The endpoint path is not listed among the provider's advertised APIs, making its purpose unclear.
Warnings
- —The /api/v1/ehr/44 path is not listed among the provider's publicly advertised endpoints — its purpose and response format are unknown.
- —All documentation pages (docs, pricing, API, README) render only 'Connect wallet' with no substantive content.
- —The 'ehr' prefix may relate to electronic health records, which could involve regulated/sensitive data — exercise caution.
- —No request body schema or response schema is available.
Citations
- —The endpoint returns a valid x402 challenge with maxAmountRequired of 20000 base units on Base network using USDChttps://lowpaymentfee.com/api/v1/ehr/44
- —Platform advertises $0.02/request pricing, no API keys, no rate limits, instant access on Base networkhttps://lowpaymentfee.com
- —USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/ehr/44