Coinigy has a strict encryption system, once your key(s) are in the system they are totally secure. Never has anyone had a key stolen from Coinigy and if for some reason they ever somehow did get stolen they/it would not be usable as they would not be able to decrypt it and on top of that even if they figured out our encryption scheme and had a quantum computer to crack the core algo they would still be useless thanks to IP restrictions.
Following the best practices and recommendations Coinigy has clearly posted such as IP white listing and setting only the minimum permissions required for an api key will ensure that even if your key does get stolen by some intermediary means the unencrypted key will still be useless. It is also advisable to keep your funds offline in cold storage, when you are not actively trading with those funds. This is just good practice however/wherever you choose to trade.
More information can be found at:
https://www.coinigy.com/security/
