This is the most cheap, yet reliable, fast zillow API.

/search

• Search Properties lists on zillow by address
• Search Properties lists on zillow by filtered URL

/property-info

• Get property details by property_address
• Get property details by property_url
• Get property details by property_zpid

In property info, there are two options one get you minmalistic, another get you advanced output.

Just Like you see on zillow.com

Cheap
Reliable
Fast