Truthfully shadchanus is as much as one wants to give combined with how much u can afford.
Sometimes there are “difficult” cases. where the parents or someone else will promise even upto $5,000.
The average these days in my neck of the woods is 1500 to 1800..
but if one cant afford it or was not satisfied with the attitude or service it might be lower.
My mom once did a shidduch and she got a flower arrangement.. from then on when someone asks me how much I charge,,I say I dont charge but whatever it is “I’d like it money” not any kind of gift items..