None of the banks have implemented this for merchants yet.
We bank with HDFC, ICICI, Kotak, SBI, and more. So if you have SBI, on Kite, the fund transfers happen to the SBI exchange client account.
HDFC Bank is from where you receive the fund withdrawal payouts, but we have backups for that as well. We are working on enabling instant payouts through another bank for <Rs 50k withdrawals.