Mortgage data API endpoint on Base, paid per-request via x402 with USDC.
What it does
This endpoint at lowpaymentfee.com provides access to mortgage-related data via a pay-per-call x402 protocol. The specific resource `/api/v1/mortgages/6` is part of a broader platform that hosts dozens of API endpoints spanning data analytics, AI/ML inference, finance, crypto, and utility services. All endpoints on the platform use the x402 payment protocol, settling in USDC on the Base network.
The x402 challenge for this endpoint specifies a maximum amount of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 per request (USDC uses 6 decimals). The platform advertises uniform $0.02/request pricing across all endpoints, with no API keys, no rate limits, and no minimum commitments required. Payment is made inline via the X-PAYMENT header.
Documentation is extremely sparse — the docs, pricing, API, and README pages all render only a "Connect wallet" prompt with no substantive content. The mortgage endpoint itself is not listed on the homepage's catalog of available APIs, making its exact input/output schema unclear. It accepts POST requests and returns application/json, but the specific fields for mortgage data (e.g., whether it returns rates, amortization schedules, or property data) cannot be determined from available materials.
Capabilities
Use cases
- —Retrieving mortgage-related financial data programmatically
- —Integrating mortgage information into financial dashboards or calculators
- —Agent-driven mortgage data lookups with micropayment settlement
Fit
Best for
- —Developers needing pay-per-call mortgage data without subscription commitments
- —AI agents that can settle x402 payments on Base in USDC
- —Prototyping financial applications that need on-demand mortgage info
Not for
- —Users who need detailed API documentation or schema definitions before integrating
- —High-volume mortgage data consumers who need bulk pricing or SLAs
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/mortgages/6 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02/request in USDC on Base), but there is no documentation, no input/output schema, and the mortgage endpoint is not even listed on the provider's own homepage catalog. It is impossible to determine what data this endpoint actually returns.
Warnings
- —The /api/v1/mortgages/6 endpoint is not listed in the provider's own homepage API catalog, raising questions about whether it is a production endpoint or a test/placeholder.
- —All documentation pages (docs, pricing, API, README) render only 'Connect wallet' with no actual content.
- —No input or output schema is available; the exact data returned by this mortgage endpoint is unknown.
- —The endpoint path includes a hardcoded ID ('6'), suggesting it may reference a specific mortgage record rather than being a general query endpoint.
Citations
- —The x402 challenge specifies maxAmountRequired of 20000 base units of USDC on Base networkhttps://lowpaymentfee.com/api/v1/mortgages/6
- —The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —USDC asset address on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/mortgages/6
- —Docs, pricing, API, and README pages show only 'Connect wallet' with no substantive documentationhttps://lowpaymentfee.com/docs