To name a few,
avast, bitdefender, mcaffe, ... etc..
As the subject says. do they really provide enough security with transactions especially in crypto?
No bud. You are taking it all wrong. Firstly an antivirus is not at all necessary in smartphones since most smartphones these days are either Android or iOS.
Both of these Operating Systems are quite secure and doesn't get affected by viruses easily. So you don't need any antivirus for your smartphone.
Even if you install an antivirus on your smartphone it will not add any layer of security to crypto transactions.
For Desktop/Laptop PCs you can install an anti-malware application that can remove any malwares in your PC. Malware Bytes would be best one in this case.
Windows Defender comes pre-installed in Windows Operating Systems which as a pretty good security against viruses. So you would just need an anti-malware app for better security on your PC.
This will ensure that your PC is safe from viruses and hence your crypto transactions will be safe.