Is there any Credit card that gives fixed % of cashback/reward on any transaction?

Yes. Amazon pay ICICI credit card flat 1% on every transaction. Axis ace

many cards give 1%

Tata plus and infinity, airtel axis, icici amazon, and some others are there, all gives 1% cashback...

Axis Ace gives 1.5% unlimited cashback on every online and offline spend. 5% cashback on GPAY utility bill payments and recharges up to Rs.500.

Amazon ICICI gives 1% cashback on online & offline spends including gold purchases.

I don't know any card which don't give fixed % of cashback. 😁 Even the worst card in the world (simple save SBI) gives a fixed % amount of cashback 

Vu+

I'm also looking for one such cc which doesn't have exclusions like utility, fuel, jewellery and so on. But didn't find one cc which covers all, got to use multiple cc to cover all these.