Mortgage data endpoint on Base, paid per-call with USDC via x402.
What it does
This endpoint at lowpaymentfee.com provides access to mortgage-related data at the path `/api/v1/mortgages/73`. It is part of a broader platform (lowpaymentfee.com) that offers dozens of pay-per-request API endpoints 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/73` 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. The platform advertises no rate limits and instant access.
Documentation is extremely sparse — the docs, pricing, API, and README pages all render only a "Connect wallet" prompt with no substantive content. The endpoint path suggests it returns data about a specific mortgage (ID 73), but there is no schema documentation, example request/response, or description of what fields are returned. The mortgage endpoint is not listed on the homepage's catalog of available APIs, which raises questions about whether it is a production endpoint or a test/demo resource.
Capabilities
Use cases
- —Retrieving mortgage data for a specific mortgage record
- —Integrating mortgage information into financial dashboards
- —Agent-driven lookups of mortgage details with micropayments
Fit
Best for
- —Developers needing on-demand mortgage data without subscription commitments
- —AI agents that can settle USDC payments on Base via x402
- —Prototyping pay-per-call financial data integrations
Not for
- —Bulk mortgage data retrieval (no documented batch endpoints)
- —Users who need detailed API documentation or guaranteed SLAs
- —Anyone without a Base-compatible USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/mortgages/73 \
-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). However, there is no documentation, no request/response schema, no examples, and the mortgage endpoint is not even listed on the provider's homepage catalog. The docs/pricing/README pages are all empty. This is effectively a stub listing.
Warnings
- —No documentation available — docs, pricing, API, and README pages all show only 'Connect wallet' with no content.
- —The /api/v1/mortgages/73 endpoint is not listed in the provider's homepage API catalog, raising questions about its status.
- —No request body schema or response schema is documented anywhere.
- —The nature of the data returned (what mortgage fields, data source, freshness) is entirely unknown.
Citations
- —The x402 challenge advertises maxAmountRequired of 20000 base units of USDC on Base networkhttps://lowpaymentfee.com/api/v1/mortgages/73
- —Platform pricing is $0.02 per request with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/mortgages/73
- —Docs, pricing, API, and README pages render only 'Connect wallet' with no substantive contenthttps://lowpaymentfee.com/docs