Mortgage data endpoint on Base, pay-per-call via x402 with USDC.
What it does
This endpoint at `/api/v1/mortgages/91` is part of the lowpaymentfee.com platform, which offers a variety of pay-per-request APIs settled via the x402 protocol on the Base network using USDC. The specific endpoint appears to serve mortgage-related data, though the exact response schema and input parameters are not documented in the available crawl material. The platform advertises a flat $0.02 per request across its API catalog, and the x402 challenge for this endpoint confirms a maxAmountRequired of 20,000 base units of USDC (6 decimals), which equals $0.02.
The platform markets itself as requiring no API keys, no rate limits, and no commitments — callers simply attach an x402 payment header with each request. The endpoint accepts POST requests and returns `application/json`. However, the mortgage endpoint is not listed on the site's main landing page (which showcases data/analytics, AI/ML, finance, and infrastructure APIs), so it may be an unlisted or less-promoted offering. No documentation, request schema, or example responses are available for this specific endpoint.
Because the endpoint's actual functionality (what mortgage data it returns, what inputs it expects) is not documented anywhere in the crawled material, consumers should treat this as a minimally-documented endpoint. The x402 challenge is live and well-formed, confirming the endpoint is operational and accepting payments on Base.
Capabilities
Use cases
- —Retrieving mortgage-related data on a per-request basis without API key registration
- —Integrating mortgage information into agent workflows that can settle payments via x402
- —Programmatic access to mortgage data for financial analysis or comparison tools
Fit
Best for
- —Agents or applications that need on-demand mortgage data with crypto-native payment
- —Developers who want keyless, pay-per-use API access on Base
- —Quick prototyping where avoiding API key signup is valuable
Not for
- —Production systems requiring well-documented request/response schemas
- —High-volume mortgage data pipelines where per-request pricing may not be cost-effective
- —Users who cannot transact in USDC on the Base network
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/mortgages/91 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-header>"Endpoint
Quality
The x402 challenge is live and well-formed, confirming the endpoint is operational. However, there is no documentation for this specific mortgage endpoint — no request schema, no response examples, and the endpoint is not even listed on the provider's landing page. Functionality must be entirely guessed.
Warnings
- —The /api/v1/mortgages/91 endpoint is not listed on the provider's main landing page, suggesting it may be unlisted, experimental, or deprecated.
- —No request or response schema is available for this endpoint; callers have no way to know what inputs are expected or what data is returned.
- —Documentation pages (/docs, /api, /pricing, /README) returned only 'Connect wallet' with no useful content.
Citations
- —The x402 challenge returns maxAmountRequired of 20000 base units of USDC (USD Coin) on Base networkhttps://lowpaymentfee.com/api/v1/mortgages/91
- —The platform advertises $0.02 per request, no API keys, no rate limits, instant access on Base networkhttps://lowpaymentfee.com
- —USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/mortgages/91