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/60`. It is part of a broader platform (lowpaymentfee.com) that offers a variety of pay-per-request APIs 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/60` 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 platform's stated flat pricing of $0.02 per request across all endpoints. No API keys are required; payment is handled inline via the X-PAYMENT header.
Documentation is extremely sparse — the docs, pricing, and API pages all render only a "Connect wallet" prompt with no further content. The mortgage endpoint itself is not listed on the homepage's catalog of available APIs, so its exact response schema and the meaning of the path parameter `60` are unknown. It may refer to a specific mortgage product, term length, or record ID, but this cannot be confirmed from available material.
Capabilities
Use cases
- —Retrieving mortgage-related data or calculations on a per-request basis
- —Integrating mortgage information into agent workflows without API key management
- —Programmatic access to mortgage data settled via crypto micropayments
Fit
Best for
- —Developers needing on-demand mortgage data without subscription commitments
- —AI agents that can settle x402 payments on Base with USDC
- —Applications requiring keyless, pay-as-you-go financial data access
Not for
- —Users needing well-documented, schema-specified mortgage APIs with guaranteed SLAs
- —Bulk mortgage data retrieval where per-request pricing would be cost-prohibitive
- —Users who cannot transact in USDC on the Base network
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/mortgages/60 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is live (returns a valid x402 402 challenge), but there is virtually no documentation, no OpenAPI schema, no example requests or responses, and the mortgage endpoint is not even listed on the provider's own homepage catalog. The purpose and response format are entirely unknown.
Warnings
- —The /api/v1/mortgages/60 endpoint is not listed in the provider's own homepage API catalog — its availability and purpose are unverified beyond the 402 challenge.
- —Documentation pages (/docs, /pricing, /api, /README) all render only 'Connect wallet' with no usable content.
- —No request or response schema is available; the meaning of path parameter '60' is unknown.
- —The provider site appears to be a generic multi-category API platform; the quality and provenance of mortgage data is unverifiable.
Citations
- —The x402 challenge advertises maxAmountRequired of 20000 base units of USDC on Base networkhttps://lowpaymentfee.com/api/v1/mortgages/60
- —The platform advertises $0.02 per request flat pricing with no API keys, no rate limitshttps://lowpaymentfee.com
- —USDC asset address on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/mortgages/60
- —The mortgage endpoint is not listed among the homepage's available API cataloghttps://lowpaymentfee.com