House Appraisal API’s

Hello,

For my class project, we are working on developing a real estate appraiser app. We have all the functionality added except for a way to provide comparables. Currently, a 'customer' can enter in house information, in which an appraiser can go through and add their remarks on the house and generate an estimate. Originally for the appraisal, we were planning on feeding in the house information to the zillow getsearchresults and getcomparables API, but it does not seem to be working anymore. Is there any reliable real-estate API's that can do what is mentioned, or any suggestions on the easiest way to do this?

Thank you!