Hello Yu Zhong,
Thanks for your question.
Log in to the Azure Portal and go to to Cost Management + Billing.
Select your billing account.
In the Billing Overview, you should see details about your subscription, including the grant amount, used amount, and remaining balance.
See: https://learn.microsoft.com/en-us/microsoft-for-startups/azure-usage?source=recommendations
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Regards,
Abiola