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/54`. 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 gated via the x402 payment protocol on the Base network using USDC.
The specific endpoint `/api/v1/mortgages/54` 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`, `/api`, `/pricing`, and `/README` 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, making its exact data schema and response format unclear. There is no OpenAPI spec or detailed documentation available from the crawl.
Capabilities
Use cases
- —Retrieving mortgage-related data for a specific record (ID 54)
- —Integrating mortgage information into financial analysis pipelines
- —Agent-driven lookups of mortgage details with instant crypto payment
Fit
Best for
- —Developers needing pay-per-call mortgage data without API key management
- —AI agents that can settle x402 payments on Base with USDC
- —Quick one-off mortgage data lookups without subscription commitments
Not for
- —Bulk mortgage data downloads or batch processing (pay-per-request model)
- —Users who need detailed documentation or schema guarantees before integrating
- —Anyone without a Base-compatible USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/mortgages/54 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is live (402 challenge confirmed) and pricing is clear at $0.02/request in USDC on Base. However, there is no documentation, no OpenAPI schema, no example request/response, and the mortgage endpoint is not even listed on the provider's homepage catalog. The actual data returned is entirely unknown.
Warnings
- —The /api/v1/mortgages/54 endpoint is not listed on the provider's homepage API catalog — its availability and purpose are unverified beyond the 402 challenge.
- —No documentation, OpenAPI spec, or response schema is available; the data format and fields returned are unknown.
- —All documentation pages (/docs, /api, /pricing, /README) render only a 'Connect wallet' prompt with no useful content.
- —This endpoint references a specific resource ID (54); it is unclear whether other mortgage IDs are available or what the ID represents.
Citations
- —The platform advertises $0.02 per request flat pricing with no API keys, no rate limits, and instant access on Base network.https://lowpaymentfee.com
- —The x402 challenge returns maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base.https://lowpaymentfee.com/api/v1/mortgages/54
- —The endpoint accepts POST requests and returns application/json per the x402 challenge outputSchema.https://lowpaymentfee.com/api/v1/mortgages/54