x402-gated premium API endpoint on Base, pay-per-request with USDC.
What it does
This endpoint at `/api/v1/ehr/82` is part of the lowpaymentfee.com platform, a collection of x402-protocol pay-per-call APIs spanning data analytics, AI/ML inference, finance, crypto, and utility services. The specific resource at `/ehr/82` is labeled "Premium API Access" but its exact functionality is not documented — the path segment "ehr" suggests it may relate to electronic health records or a similar domain, though 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 `maxAmountRequired` is 20,000 base units, which at 6 decimals for USDC equals $0.02 per request — consistent with the platform's advertised flat $0.02/request pricing across all endpoints. No API keys are required; access is granted by including a valid `X-PAYMENT` header with each POST request. The platform advertises no rate limits and no minimum commitments.
Documentation is extremely sparse. The docs, pricing, API, and README pages all render 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. The `outputSchema` in the x402 challenge only confirms the HTTP POST method. Prospective users should treat this as an exploratory endpoint until the provider publishes proper documentation.
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 network
Fit
Best for
- —Developers experimenting with x402 payment-gated APIs
- —AI agents that can settle USDC payments on Base per call
- —Users who want keyless, commitment-free API access
Not for
- —Production workloads requiring documented request/response schemas
- —Users who need free or fiat-only payment options
- —Applications requiring guaranteed SLAs or support
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/ehr/82 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is live and returns a valid x402 challenge, but there is zero documentation on what the /ehr/82 resource actually does, no request/response schema, and no examples. The docs pages are empty. This is effectively a stub listing.
Warnings
- —The exact purpose of /api/v1/ehr/82 is unknown — 'ehr' may imply health data, which could be a regulated category (HIPAA, etc.)
- —No documentation exists beyond the x402 challenge; docs/pricing/README pages are blank
- —No request body schema or response schema is available
- —The 'Premium API Access' label is generic and shared across the platform; it does not describe this specific endpoint
Citations
- —Platform advertises $0.02/request flat pricing with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —x402 challenge returns maxAmountRequired of 20000 base units in USDC on Base networkhttps://lowpaymentfee.com/api/v1/ehr/82
- —USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/ehr/82