How do I get a Bing API key?

A new Bing API gives you an official permission to send automated queries when fetching data from the search engine's database.

The amount of automated queries you may send with a new Bing Search API per month depends on the package you choose. There is a free package that has 5,000 transactions per month. Also, if you need to run more searches, you may sign up for one of the paid packages. Bing offers some paid packages that include from 10,000 to 2,500,000 transactions per month, according to the number of search requests you need to perform through Bing Search API.

To get a new Bing Search API - Web Results Only key, you need to sign up to the Bing service on the Windows Azure Marketplace.

Once you have applied for one of the available packages by clicking on the Sign Up button, you will get redirected to the page where you need to log into your Microsoft account. If you don’t have any, please create it one from this page (the procedure is rather simple and won't take you more than 2 monutes).

When done, click on the Sign Up button on the page that opens  to complete the subscription Bing Search API.

Finally please lauch  SEO PowerSuite apps go to Preferences -> Search Engines API Keys, enable an appropriate checkbox and paste the key into the adjacent field.