Mortgage data endpoint on Base, pay-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/53`. It is part of a broader platform (lowpaymentfee.com) that offers a variety of pay-per-call APIs 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/53` is listed under "Premium API Access" and accepts POST requests. The x402 challenge indicates a maximum cost of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 per request (USDC uses 6 decimals). The platform advertises no API keys, no rate limits, and instant access — payment is handled entirely through the x402 payment header.
Documentation is extremely sparse. The crawled docs, API, pricing, and README pages all returned only a "Connect wallet" prompt with no substantive content. There is no OpenAPI schema, no request/response examples, and no description of what data the mortgages endpoint actually returns. The endpoint path suggests it retrieves data for a specific mortgage record (ID 53), but the actual payload structure, required POST body fields, and response format are unknown. The platform appears live (root returns 200, x402 challenge is valid), but the lack of documentation makes integration difficult without experimentation.
Capabilities
Use cases
- —Retrieving mortgage record data programmatically with per-call USDC payment
- —Integrating mortgage information into financial dashboards or agent workflows
- —Exploring x402-based pay-per-request API patterns on Base
Fit
Best for
- —Developers experimenting with x402 payment protocol on Base
- —Agents needing on-demand mortgage data without API key management
- —Low-volume, pay-as-you-go mortgage data retrieval
Not for
- —Users who need detailed API documentation before integrating
- —High-volume mortgage data consumers who need bulk pricing or SLAs
- —Anyone without a Base-compatible USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/mortgages/53 \
-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 request/response schemas, no OpenAPI spec, and no examples. The mortgage endpoint's purpose and data model are entirely opaque. This is effectively a stub listing.
Warnings
- —No documentation available — docs, API, pricing, and README pages all return only a wallet-connect prompt with no content
- —No OpenAPI or schema describing request body or response format for /api/v1/mortgages/53
- —The specific purpose of the mortgages/53 endpoint is unclear — it is not listed on the homepage's API catalog
- —Cannot verify what data is returned without making a paid request
Citations
- —The x402 challenge returns maxAmountRequired of 20000 base units of USDC on Base networkhttps://lowpaymentfee.com/api/v1/mortgages/53
- —The platform advertises $0.02 per request, no API keys, no rate limits, instant access, Base networkhttps://lowpaymentfee.com
- —USDC contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/mortgages/53
- —Docs, API, pricing, and README pages return only a Connect wallet prompthttps://lowpaymentfee.com/docs