x402-gated premium API endpoint on Base, pay-per-request with USDC.
What it does
This endpoint at `/api/v1/ehr/43` is part of the lowpaymentfee.com platform, a collection of x402-protocol pay-per-request APIs spanning data analytics, AI/ML inference, finance, and utility services. The specific `/api/v1/ehr/43` path is listed under the title "Premium API Access" but its exact functionality is not documented on the site — the "ehr" path segment suggests it may relate to 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`) via the "exact" scheme. The maximum amount required is 20,000 base units, which at 6 decimals for USDC equals $0.02 per request — consistent with the site's advertised flat pricing of $0.02/request across all endpoints. The platform advertises no API keys, no rate limits, and instant access; callers simply attach an `X-PAYMENT` header with a valid x402 payment proof.
Documentation is extremely sparse. The crawled docs, API, pricing, and README pages all returned only a "Connect wallet" prompt with no substantive content. There is no OpenAPI schema, no request/response examples, and no description of what data this specific endpoint returns. Callers should be prepared to experiment or contact the provider for details on the expected POST body and response format.
Capabilities
Use cases
- —Accessing premium data behind a per-request paywall without API key registration
- —Agent-driven data retrieval with automatic USDC micropayments on Base
- —Programmatic access to an EHR-like resource via x402 protocol
Fit
Best for
- —Developers or agents already set up with x402 payment flows on Base
- —Use cases requiring keyless, pay-as-you-go API access
- —Low-volume or exploratory queries where $0.02/request is acceptable
Not for
- —Users who need detailed API documentation or guaranteed SLAs before integrating
- —High-volume bulk data retrieval where per-request costs add up
- —Anyone needing verified, regulated health data with compliance guarantees
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/ehr/43 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-proof>" \
-d '{}'Endpoint
Quality
The endpoint is live and returns a valid x402 challenge, but there is zero documentation on what /api/v1/ehr/43 actually does, what request body it expects, or what it returns. No OpenAPI spec, no examples, and all doc pages are empty. This is effectively a stub listing.
Warnings
- —The exact purpose of /api/v1/ehr/43 is unknown — 'ehr' may imply health records but this is unconfirmed and undocumented.
- —No OpenAPI schema, request/response examples, or meaningful documentation available.
- —All documentation pages (docs, API, pricing, README) returned only 'Connect wallet' with no content.
- —If this endpoint serves health data, it may fall under regulated categories (HIPAA, etc.) — no compliance information is provided.
- —The endpoint path '/api/v1/ehr/43' does not appear in the site's listed API catalog, raising questions about its intended audience.
Citations
- —The endpoint returns a valid x402 challenge with maxAmountRequired of 20000 base units in USDC on Basehttps://lowpaymentfee.com/api/v1/ehr/43
- —The platform advertises $0.02/request flat pricing with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/ehr/43