Is the Payconiq by Bancontact app free of charge?

Yes, you can download the Payconiq by Bancontact app free of charge from the App Store (iOS) and the Google Play Store (Android). In principle, the bank that issued your Bancontact card(s) could charge a transaction fee. But as far as we know, none of the banks is charging a transaction fee at the present time. Just to be sure, check your bank's Terms of Business.