Hello @Pascal , Thanks for using Microsoft Q&A Platform.
Here are the pricing details for the Bing search API.
Make sure you check your subscription and the resource details. If you are using standard (S1) instance, then you will be charged as mentioned here in the screenshot.
If you have created Azure free account, during the first 30 days you have $200 credit in your billing currency to use on any service, except for third-party Marketplace purchases.
You can experiment with different tiers and types of Azure services using the free credit to try out Azure. If you use services or Azure resources that aren’t free during that time, charges are deducted against your credit.
Try to check your Usage once again.
Regards,
Vasavi