What is the APY for staking in the Avalanche Wallet?
It is roughly 9.2%.
What is the delegation fee?
The delegation fee set by validators is the portion of the rewards that are paid to the validators. The minimum is 2%.
So what will I get at the end of the staking period if there is a delegation fee?
Example: You earn 10 AVAX from your staking period, 0.2 AVAX goes to the validator for the delegation fee. This provides a net of 9.8 AVAX for your rewards.
What is the minimum amount I can delegate/stake in the wallet?
Users must have 25 AVAX to delegate/stake in the wallet.
Why was 25 AVAX chosen and will that change?
25 AVAX is baked into the genesis block, as a network parameter. Changing it would require a network upgrade. Ava Labs' plan has been to make network parameters themselves decided by consensus (e.g. voting), but that code hasn't been written yet.
The lower limit is an anti-Sybil mechanism. If it wasn't there I could create a billion 0.000000001 AVAX delegations, which would not be good for network health.