Mortgage data endpoint on Base, pay-per-request via x402 with USDC.
What it does
This endpoint at `/api/v1/mortgages/17` is part of the lowpaymentfee.com platform, which offers a broad catalog of pay-per-call APIs settled via the x402 protocol on the Base network using USDC. The specific endpoint appears to serve mortgage-related data (resource ID 17), though the exact response schema and input parameters are not documented in the available crawl material. The endpoint is live and returns a valid x402 challenge on POST.
The platform advertises a flat $0.02 per request across its API catalog, and the x402 challenge for this endpoint shows a `maxAmountRequired` of 20,000 base units of USDC (which is $0.02 given USDC's 6 decimals). Payment is made via the x402 exact scheme to a specified wallet address on Base. No API keys or rate limits are advertised — access is gated purely by micropayment. The site lists dozens of endpoints spanning data analytics, AI/ML inference, finance, crypto, and utility services, all at the same price point.
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 spec, no request/response examples, and no description of what mortgage data this endpoint actually returns. The endpoint's purpose must be inferred entirely from its URL path.
Capabilities
Use cases
- —Retrieving mortgage-related data for a specific resource (ID 17)
- —Integrating pay-per-call mortgage information into financial applications
- —Agent-driven lookups of mortgage data without API key management
Fit
Best for
- —Developers needing on-demand mortgage data with no subscription commitment
- —AI agents that can settle x402 micropayments on Base
- —Prototyping financial tools that consume mortgage information
Not for
- —Users who need detailed documentation or guaranteed SLAs before integrating
- —Bulk mortgage data retrieval where per-request costs would accumulate significantly
- —Anyone unable to settle USDC payments on the Base network
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/mortgages/17 \
-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 what the mortgage endpoint actually returns, what inputs it accepts, or what 'mortgages/17' represents. No OpenAPI spec, no examples, and all doc pages are empty. The listing is essentially a stub.
Warnings
- —No documentation available — docs, pricing, API, and README pages all show only 'Connect wallet' with no content
- —No OpenAPI or schema describing request parameters or response format for the mortgages endpoint
- —The specific purpose of '/api/v1/mortgages/17' (resource ID 17) is unknown — it is not listed on the site's homepage catalog
- —Cannot verify what data is returned without making a paid request
Citations
- —The endpoint returns a valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Basehttps://lowpaymentfee.com/api/v1/mortgages/17
- —The platform advertises $0.02 per request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/mortgages/17