It’s very, very high.
You are putting down a hefty chunk of cash in addition to the high monthly rate. I’d walk.
Start by going through the marketplace advertised deals as a benchmark and see if you can negotiate a better deal.
How did you approach this deal? Did you say you wanted a lease payment of no more than $450 a month?
Any time I see a deal like this, or at $499, $599, etc. I believe the dealer is trying to make you buy a payment instead of giving you their best deal. They sell you a payment instead of giving you a good deal.
What is the MSRP of this vehicle and how much of a discount off did they quote? I think these Ioniqs are going for about 6% off MSRP plus base rate money factor. Look at some of the pre-negotiated deals to see how your deal stacks up.