Mortgage data API endpoint on Base, pay-per-call via x402 with USDC.
What it does
This endpoint at lowpaymentfee.com provides access to mortgage-related data at the path `/api/v1/mortgages/33`. It is part of a broader platform (lowpaymentfee.com) that offers dozens of pay-per-request API endpoints spanning data analytics, AI/ML inference, finance, crypto, and utility services — all gated via the x402 payment protocol on the Base network using USDC.
The specific endpoint `/api/v1/mortgages/33` 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). This is consistent with the site's uniform $0.02/request pricing across all endpoints. Payment is made via the x402 exact scheme — no API keys, subscriptions, or rate limits are required.
Documentation is extremely sparse. The landing page lists available endpoints and pricing but provides no request/response schemas, parameter descriptions, or example payloads for any endpoint, including this mortgage one. The `/docs`, `/api`, `/pricing`, and `/README` pages all render only a "Connect wallet" prompt with no substantive content. The mortgage endpoint path (`/mortgages/33`) suggests it may return data for a specific mortgage record (ID 33), but the exact data model, accepted parameters, and response structure are unknown.
Capabilities
Use cases
- —Retrieving mortgage record data programmatically with per-call USDC payment
- —Integrating mortgage information into financial dashboards or agent workflows
- —Querying specific mortgage details without API key registration
Fit
Best for
- —Developers wanting keyless, pay-per-call access to mortgage data
- —AI agents that can settle x402 payments on Base
- —Quick one-off mortgage data lookups without subscription commitments
Not for
- —Users needing detailed API documentation or guaranteed response schemas before integrating
- —Bulk mortgage data retrieval where per-call pricing would be cost-prohibitive
- —Users without a Base-compatible USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/mortgages/33 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-header>"Endpoint
Quality
The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02/request in USDC on Base). However, there is no documentation, no request/response schema, no examples, and no explanation of what the mortgage endpoint actually returns. The docs, pricing, and README pages are all empty beyond a wallet-connect prompt. This is effectively a stub listing.
Warnings
- —No API documentation available — all doc pages render only 'Connect wallet'
- —No request or response schema provided for /api/v1/mortgages/33
- —The endpoint path suggests a single mortgage record (ID 33); unclear if other IDs are available or what data is returned
- —The 'Premium API Access' title is generic and does not describe the actual functionality
Citations
- —Uniform pricing of $0.02 per request across all endpointshttps://lowpaymentfee.com
- —No API keys, no rate limits, instant access on Base networkhttps://lowpaymentfee.com
- —x402 challenge returns maxAmountRequired of 20000 base units of USDC (USD Coin) on Basehttps://lowpaymentfee.com/api/v1/mortgages/33
- —USDC contract address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/mortgages/33