Hi Aliatoui,
1/ The Lyxor STOXX 600 Banks ETF can be accessed through :
getAlphathonBBs(“BNKa”,asPrice = TRUE)
The data you get is a building block which in the case of an ETF is basically a price series re-based from 100.
On the Alphien platform, investable assets are always represented by building blocks, you can learn more about them in the wiki:
https://wiki.alphien.com/ALwiki/Introduction_to_Alphien_Pillars_and_Building_Blocks
If you want to see all available building blocks for the competition you can use
getAlphathonBBs()
2/ You can adopt any investment horizon you want. If your payout function doesn’t generate a signal, your portfolio will not get re balanced and your strategy will not be penalized by transaction costs.
This page explains how payout signal works with concrete examples:
https://wiki.alphien.com/ALwiki/Creating_a_payout
I hope this helps, let me know if you have any other questions !
Aurian