Can I use credit card top up grab wallet to pay insurance policy premiums via mobile AXS?

Grab is not accepted in AXS anymore.

If you happened to have grabpay card(virtual/physical), you can actually schedule the payment via cardup.co. It charges you 2.25*-2.6% and dont gives grab reward points. However given you get extra 5% via grab from UOB One, you still earn some cashback off.

Use my promo code CHUNCHUANL50 to get $20 off your 1st payment if you are keen to explore!

*2.25% when used promo code GET225, valid until 30/6/2020​​​

1. Get a GrabPay MasterCard

2. Use your different credit card to top up your GrabPay MasterCard

3. Use your GrabPay Mastercard to pay for the insurance premiums on AXS or SAM machines update GPMC is not usable on AXS machine now

You get credit card points for topping up GrabPay and Grab Reward points for using GrabPayMasterCard!​​​

As shared on https://community.whatcard.sg/t/axs-has-for-now..., you could consider "paying your AXS bills using your Grabpay Mastercard under “Credit Cards” option of the AXS app."
So you may top up your Grabpay wallet using any of your credit cards, then paying your bills with the Grabpay Mastercard that's linked to your Grabpay wallet.

No you can no longer do so as grabpay wallet just got deactivated on AXS. You can do so with the grabpay mastercard though!