How secure is this?
We take every measure to keep your wallet secure including encrypting data with isolated encryption hardware and rotating keys to minimize the impact of a breach.
There is another side to this though, your TurboWallet is only as secure as your messenger so be sure to lock down access to your messenger with two-factor authentication (2fa) if it's available and set a password on Telegram (not just your phone number).
DO NOT KEEP LARGE AMOUNT OF CRYPTO IN YOUR TURBOWALLET ACCOUNT!
On another note, each messenger account you use will have a separate wallet/address so if one messenger gets compromised, the others will be safe.
Do you have an API?
Yes, see Developers for more information.