Minimum Amount Required for Native
You can use Marinade Native with as little as 1 SOL. Nonetheless, Marinade will never create smaller stake accounts than 1 SOL, so your stake will not be split across a hundred validators but will stay delegated to a lower number of validators with stake accounts of 1 SOL each.
We recommend using Marinade Native with at least 100 SOL to get your stake fully distributed.