Mortgage data endpoint on Base, paid per-request via x402 with USDC.
What it does
This endpoint at lowpaymentfee.com provides access to mortgage-related data at the path `/api/v1/mortgages/31`. It is part of a broader platform (lowpaymentfee.com) that offers dozens of pay-per-call API endpoints spanning data analytics, AI/ML inference, finance, crypto, and utility services — all settled via the x402 protocol on the Base network using USDC.
The specific endpoint `/api/v1/mortgages/31` is listed under "Premium API Access" and accepts POST requests. The x402 challenge indicates a maximum cost of 20,000 base units of USDC (0.02 USD per request, consistent with the site's uniform $0.02/request pricing). Payment is made on-chain to the specified wallet address on Base, with no API keys or rate limits required. The platform advertises instant access with no minimums or 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 mortgage data is returned or what parameters the POST body accepts. The endpoint is live (returns a proper 402 challenge), but without documentation it is unclear what data fields are available or what input the endpoint expects.
Capabilities
Use cases
- —Retrieving mortgage data or calculations programmatically
- —Integrating mortgage information into financial dashboards
- —Agent-driven mortgage data lookups with micropayments
Fit
Best for
- —Developers needing on-demand mortgage data without subscription commitments
- —AI agents that can settle x402 payments on Base
- —Applications requiring pay-per-call financial data access
Not for
- —Users who need detailed API documentation before integrating
- —Bulk mortgage data retrieval (no documented batch support)
- —Non-crypto payment workflows (only USDC on Base is accepted)
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/mortgages/31 \
-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 request parameters, response schema, or what mortgage data is actually returned. The docs/pricing/README pages are all blank beyond a wallet connect prompt. This is effectively a stub listing.
Warnings
- —No documentation available — docs, pricing, API, and README pages all show only 'Connect wallet' with no content.
- —No OpenAPI or request/response schema provided; unknown what POST body is expected or what data is returned.
- —The endpoint path '/api/v1/mortgages/31' is not listed on the site's homepage among its advertised APIs, raising questions about its purpose.
- —Cannot verify what 'mortgages/31' refers to — could be a specific mortgage record, a calculation endpoint, or something else entirely.
Citations
- —The site advertises $0.02 per request pricing with no API keys, no rate limits, and instant access on the Base network.https://lowpaymentfee.com
- —The x402 challenge returns maxAmountRequired of 20000 base units of USDC (USD Coin, 6 decimals = $0.02) on the Base network.https://lowpaymentfee.com/api/v1/mortgages/31
- —Docs, pricing, API, and README pages render only a 'Connect wallet' prompt with no substantive documentation.https://lowpaymentfee.com/docs