Bradley Eggers The number of transactions to a resource are counted under TPS and they vary from pricing tier of your resource to the kind of API being called.
For example: The free tier allows all APIs mentioned above except custom search, but the TPS and the monthly usage limit is very limited to making a few calls not exceeding 1000 transactions/month. If you are just testing basic scenarios this should be enough or you can move to a higher tier for higher limits. Every time you make a call to the API the transaction is counted so if you are calling the API in your application then the usage limit might not be in limited control if the app is made public.
Every search feature has its own API, so you can use the relevant API to make a call independently of another. The total transactions though count under the single resource.
Ex: Web search uses https://api.bing.microsoft.com/v7.0/search
News search uses https://api.bing.microsoft.com/v7.0/news
The keys used to call both the APIs can be of a single resource, this ensures the total count is summed up against the resource.
The use and display requirements cover all the services and you need to ensure to comply to these requirements if you are planning to use the bing search APIs.
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