I'm looking to add a function in my website (Squarespace) that offers instant real estate estimate. I'd like to query multiple website's estimates with a zip code adjustment, then instant publish the result.
For example, someone who wants to see what their house is worth (4603 CREEK SHORE Dr ROCKVILLE, MD 20852), types in all the required fields in my website (address, city, state, zip code), then the script will go out to various public websites such as Zillow, Redfin, etc. and query their estimate together (for example, $200,000 and $250,000, hence $225,000 average). Then I'll have a list of zip codes and their adjustments (for example, zip code 20852 will require a 3.7% increase), my website then will provide the result of $233,325 ($225,000 + 3.7% increase), disclaimer and an offer for professional estimate.
I'm looking for clean codes to accomplish this, and the ability to update zip code adjustments myself easily (since they change on a monthly or quarterly basis).