Mortgage data endpoint on Base, pay-per-call with USDC via x402 protocol.
What it does
This endpoint at lowpaymentfee.com provides access to mortgage-related data at the path `/api/v1/mortgages/69`. 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.
The specific endpoint `/api/v1/mortgages/69` accepts POST requests and returns JSON. Payment is settled in USDC on Base (contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`). The maximum amount required per call is 20,000 base units of USDC (6 decimals), which equals $0.02 USD. This is consistent with the platform's uniform $0.02/request pricing across all listed endpoints. No API keys or rate limits are advertised; access is granted immediately upon valid x402 payment.
Documentation on the site is extremely thin — the docs, pricing, API, and README pages all render only a "Connect wallet" prompt with no additional technical detail. There is no OpenAPI spec, no request/response schema, and no example payloads available. The endpoint path suggests it returns data about a specific mortgage record (ID 69), but the exact fields, input parameters, and response structure are unknown. The platform appears to be a demonstration or early-stage deployment of x402-gated APIs.
Capabilities
Use cases
- —Retrieving mortgage record data programmatically with per-call USDC payment
- —Integrating mortgage information into agent workflows without API key management
- —Demonstrating x402 protocol payment flows for financial data access
Fit
Best for
- —Developers experimenting with x402 payment protocol
- —Agents needing on-demand mortgage data without subscription commitments
- —Projects requiring keyless, pay-per-use financial data endpoints
Not for
- —Production systems requiring documented request/response schemas
- —Bulk mortgage data retrieval (no batch endpoint documented)
- —Users without USDC on Base network
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/mortgages/69 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-header>"Endpoint
Quality
The endpoint is live and returns a valid x402 402 challenge, confirming it is operational. However, there is no OpenAPI spec, no documented request/response schema, no examples, and the docs pages are empty stubs. The specific purpose of the /mortgages/69 endpoint is unclear beyond the URL path. This is effectively a stub listing.
Warnings
- —No OpenAPI or schema documentation available — request and response formats are unknown
- —All documentation pages (docs, pricing, API, README) render only 'Connect wallet' with no content
- —The /api/v1/mortgages/69 path is not listed among the platform's advertised endpoints, suggesting it may be a test or unlisted resource
- —Platform appears to be early-stage or a demo deployment
Citations
- —The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Basehttps://lowpaymentfee.com/api/v1/mortgages/69
- —Platform-wide pricing is $0.02 per request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/mortgages/69