Method to test google passed proxies

How do they do that?

I bet it's not only to open Google's home page, just like when testing a proxy if it works, and then search for specific strings.

Do they perform random searches?

The reason I asked is I want to automate this thing. Using ScrapeBox to test this a few times a day becomes boring.

Whoer.net can help you find the quality of your proxy; the disguise rate should be 100% and you can achieve that by going an extra step by replacing your device's time with the time of the region where your proxy is actually located.

scrapebox could test for google proxies.

You can use residential proxies with a largr pool IPs,
Or you can try serp API, Here is a nice list,

• Bright Data: $500 for 200K searches – <all search engines supported> – depend on requests – No client library
• SerpApi: $3K for 1K searches – <10 search engines supported> – $1 free credit – client libraries provided
• DataForSEO: $50 for 50K searches – <5 search engines supported> – 100 searches free – client libraries provided
• Apify Google Scraper: Free, but you need proxies – <Google only> – Free to use – Node.js library only
• Proxycrawl Google Scraper: $29 for 50K searches – <Google only> – Free trial available – No client library
• Serpstack: $29 for 5K searches – <Google only> – 100 searches free – No client library
• Scale SERP: $0.29 for 1K searches – <Google only> – 125 searches free – client libraries provided
• ScraperAPI: $29 for 250K requests – <all SERPs> – 5K API calls free
• Zenserp: $29 for 5K searches – <Google and YouTube> – 50 searches free – client libraries provided
• Value SERP: $1.5 for 1K searches – <Google only> – 100 searches free – No client library
• Whatsmyserp: $45 for 5K searches – <Google only> – 100 searches free – No client library
• SERPMaster: $20 for 5K searches – <Google only> – 250 searches free – No client library
• SerpsBOT: $1 for 1K searches – <4 search engines supported> – 1000 free credits – No library supported
• ScrapingBee: $29 for 4K searches – <Google only> – 40 free searches – client libraries provided
• GeoRanker: $300 for 300K searches – <10 search engines supported> – 7 days (payment method required) – No client library