Is instant checkmate dot com free to use or does it cost money? Are these any providers of this service that are free of charge?

Answer 1

No idea.

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Answer 2

https://www.instantcheckmate.com/?utm_source=GOOGSRCH&traffic[source]=GOOGSRCH&utm_medium=search&traffic[medium]=search&utm_campaign=&traffic[campaign]=:&utm_term=&traffic[term]=&utm_content=&traffic[content]=&s1=&s2=&s3=&s4=&s5=&traffic[funnel]=bg&traffic[sub_id]=&traffic[s2]=&gclid=CjwKCAjwpKveBRAwEiwAo4PqmzYExzRKHwiCMCWip-069II4PNOFa1Q6HT9waHrCTirwcLBZ8KAq1RoCbkkQAvD_BwE

It costs money. I used one of these once and they kept bothering me for months.