@Rova Joro I believe you are referring to Bing APIs as per the tags on this thread. You should get the relevant information of pricing from this page which is based on the number of transactions for a pay as you go account which is billed monthly as per your subscription billing cycle. The pricing is changing on May 1st 2023 and you might want to consider the new pricing table also before taking a decision.
The documentation of bing search APIs is also a good source of information if you would like to explore more.
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