This really depends on the Network that you are staking with. See our Network specific staking FAQ's for additional information.
At ValidatorNode, we do not deliberately put a minimum/maximum filter as a prerequisite to get you onboard. You can start generating a proportionate passive income by staking as little or as much you want.
However, depending on the partner network our high-value “Delegators/Staking-partners” do benefit from exclusive offers and opportunities.
You can also use this smart “Staking Income Calculator” tool to get an estimate of your fixed earnings.