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?
No idea.
We are not connected with social media. This is a place to ask homework questions.
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.