APY is calculated based on sampling the value of totalAssets / totalSupply of a vault. This sample can be taken at different intervals and is then extrapolated to a yearly value.

Variations between Daily, Weekly and Monthly APY for the same vault are to be expected as the true APY changes over time for many yield opportunities. It is even possible that APY could be negative for some period of time, depending on the mechanics of the vault.

All protocols tend to calculate their APY in different ways. Superform standardizes APY calculation so sometimes it will differ from what you see on a protocol's app.

Yield earned on Superform is automatically accrued to your position as the value of the assets in the vault increases over time. There is no need to claim anything; when you withdraw your position, you will simply receive more than you deposited (assuming the vault returned a positive APY during that period). For example, if you deposited $1000 in a vault with steady 10% APY, in 1 year you would be able to withdraw $1100.