How to find how many pages of my site Google has indexed

Normally I use site: to find how many pages of my site Google has indexed. Eg:

site:www.sev.com.au

This still works fine when manually searching at the google website. However, when I use the same search using Google API, the returned estimatedTotalResultsCount is 0. It used to work but around April this year, it suddenly started returning a 0 value and has ever since. Does anyone know how I can find out how many pages of a specific website Google has indexed using Google API? Thanx!

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(Tell you by a secret): site:www.sev.com.au in google search box

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