Yes, if you are already running a campaign that is performing well and you don't want to worry about adding budget every time it finishes you can now set an automatic 'refill' that will add money from your Wallet when it's about to end.
1. Go to: https://adf.ly/advertiser
2. Click on the little configuration icon on the right side of the campaign you wish to auto top up and open the 'Configure Campaign' box.
3. Tick the box next to 'Auto topup'.
4. Click 'Update' to save the changes.
This campaign will automatically be 'replicated' as soon as it finishes so you will not stop receiving traffic. The funds will be deducted from your Wallet and it will continue as long as it has enough credit.
To stop the Auto topup just uncheck the box, the traffic will stop when the current campaign runs out of budget.