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This question already has an answer here:

I need to build an web application C# and below is what I'm stuck with

Can I use Stack Exchange's API with Key? Do they have a "hello world" key can be used for learning purpose. I wish to get the count of response posted for any question on Stack Exchange ...

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migrated from Jun 26 '14 at 16:09

This question came from our site for professional programmers interested in conceptual questions about software development.

marked as duplicate by Tim Stone Jul 8 '14 at 2:52

This question was marked as an exact duplicate of an existing question.

This question appears to be off-topic because it is about the API, not general programming questions. – Telastyn Jun 26 '14 at 15:24
So far, this is a duplicate of Looking for a beginner's tutorial to using the API. – Brock Adams Jun 26 '14 at 21:35
up vote 0 down vote accepted

You can use the API without a key, you'll just have lower limits without it. From the application registration form:

Upon registering, you'll be provided an API key which grants your app a much larger per-day request quota than using the API anonymously.

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