Cognitive Services Pricing - Bing Spell Check API

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Bing Spell Check API v5 pricing

Existing customers who are using existing Bing API keys v5 for Spell check will be able to continue to use them:

  • until 16th October 2018 for direct customers;
  • until the end of their respective contracts for EA customers;

However, the creation of new Bing API keys (v5) will not be available starting 16th October 2017 onwards.

Spell check v5 pricing

Standard S1 Standard S2 Standard S3
Price (per month) $5 $50 $450
Maximum transactions included in tier 10,000 1,00,000 10,00,000
Overage rate (per 1,00,000 transactions) N/A $50 $50

Bing Spell Check API is licenced separately and is governed by the following Terms of Use.

Support & SLA

  • Free billing and subscription management support are included.
  • We guarantee that Cognitive Services running in the standard tier will be available at least 99.9 percent of the time. No SLA is provided for the free trial. Read the SLA.


  • Bing Search APIs are invoiced based on number of transactions (also known as API calls). These plans are pay-as-you-go and does not incur additional cost for complex queries and more than 10 results (up to 50 results in most cases).

  • If you happen to exceed the mentioned number of transactions per second (TPS), your usage will be throttled to be within the mentioned limit. If your application needs to have higher TPS than the ones mentioned on this page, please reach out to the Azure support team.

  • For billing purposes, a transaction is a successful Bing API call request (though there are caveats for DoS attacks). For logging and reporting purposes such as for the Bing Statistics Add-in, it is any Bing API call irrespective of whether it is successful or not.

  • You can change the tier of service anytime. Please make sure you use appropriate keys in your API calls. If you are having enterprise agreement with Microsoft, please work with your account executive.


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