I highly doubt anyone legit would contact you for the sole purpose of it they know where to find match fixing or doing it themselves with a group of people, why would they need to sell you the opportunity for $1k+?

Think about it, they can just make that in a day by match fixing & if they say "No i don't want to take the risk" - Highly doubt they would know about the match fixing scheme they have because it's highly secure, not a lot of people get into a circle like that.