Data: I do not mean historical SPY options data. But there is a JSON gate for all contract prices from the end of the last trading day - https://query2.finance.yahoo.com/v7/finance/options/spy . With the „?date=“ , one can select any expiration date. The data correspond to the styled html Yahoo page https://finance.yahoo.com/quote/SPY/options?p=SPY .

Subscription: Data subscription is not requested for manual trading with IB. You receive automatically the „delayed“ data and you can manually place orders. I use that for the Z8/Z9 and similar risk premia strategies.

Concerning my problem - the Zorro manual - Z13 : „If you have no market subscription for SPY, set Preload in z.ini and download SPY from another source.“ Which is what I did, providing the .t8 file in the history folder, but Z13 script pulls data from IB plugin and ends with an error 053 :-/.