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 (resource ID 22) via the x402 payment protocol. The endpoint accepts POST requests and returns JSON. Payment is settled on the Base network using USDC (contract 0x8335…2913) with a maximum cost of $0.02 per request (20,000 base units at 6 decimals). No API keys or rate limits are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof.
The parent site lowpaymentfee.com hosts a broad collection of pay-per-call APIs spanning data analytics, AI/ML inference, finance, crypto, and utility services, all priced at $0.02 per request. However, the specific /api/v1/mortgages/22 endpoint is not listed on the site's landing page among the advertised APIs, and no documentation describes its request body schema or response format. The endpoint is confirmed live (returns a proper 402 challenge), but the lack of any mortgage-specific documentation or examples means the actual data returned is unknown.
Because the crawled docs pages, pricing page, and README all rendered only a "Connect wallet" prompt with no substantive content, there is very little information available about what this mortgage endpoint actually returns or what input it expects beyond a POST request with JSON content type.
Capabilities
Use cases
- —Retrieving mortgage-related data for a specific resource (ID 22)
- —Integrating pay-per-call mortgage information into financial applications
- —Agent-driven lookups of mortgage details without managing API keys
Fit
Best for
- —Developers needing on-demand mortgage data with crypto micropayments
- —AI agents that can settle x402 payments on Base
- —Applications that want keyless, pay-as-you-go API access
Not for
- —Users who need comprehensive mortgage comparison or search across many listings
- —Anyone without a Base-network USDC wallet or x402-compatible client
- —Production use cases requiring documented request/response schemas
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/mortgages/22 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-proof>"Endpoint
Quality
The endpoint is live and returns a valid x402 402 challenge, but there is no documentation, no OpenAPI schema, no request/response examples, and the specific /mortgages/22 path is not even listed among the site's advertised APIs. Effectively a stub with confirmed liveness.
Warnings
- —The /api/v1/mortgages/22 endpoint is not listed among the site's advertised APIs — its purpose and data content are undocumented.
- —All documentation pages (docs, pricing, README, api) returned only a 'Connect wallet' prompt with no usable content.
- —No request body schema or response schema is available; callers must discover behavior experimentally.
- —The endpoint's description is the generic 'Premium API Access' with no mortgage-specific detail.
Citations
- —Endpoint returns a 402 challenge with x402Version 1, accepting USDC on Base network with maxAmountRequired of 20000 base unitshttps://lowpaymentfee.com/api/v1/mortgages/22
- —USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/mortgages/22
- —Site advertises $0.02 per request pricing with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —The /api/v1/mortgages/22 path is not listed among the site's available APIshttps://lowpaymentfee.com