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All right guys it's time for the boss level challenge.

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And in this challenge we're going to be using what we learned in previous modules to build out the functionality

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of our app so that we can actually get real time data for the price of bitcoin theorem and like coins

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to give our app its full functionality.

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And we're going to be using the API provided by coin API dot Io.

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So if you head over to this Web address and take a look at their API docs you'll see that they can provide

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a whole bunch of data on a lot of different coins.

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But what we're mostly interested in is the exchange rates.

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So and to rest api exchange rates you can see that the way that you would be out to get the price of

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bitcoin or any other cryptocurrency that they provide has a U.R.L. that look something like this.

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So you have the base U.R.L. up to here and then you have the cryptocurrency identifier.

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And then after a fourth flash you have the fiat currencies such as U.S. dollars or pounds sterling or

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euros.

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And this will give you back a piece of Jason data that looks something like this where you can tap into

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this rate object and get hold of the current value.

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Say for example in this case the price of bitcoins in U.S. dollars.

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But that's not it.

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We also have to provide a way of authenticating ourselves.

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So an API key just like what we did in the Kliman app when we worked with the open weather map API.

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So in order to get hold of an API key you have to head over to coin API dot Io slash pricing and we're

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just going to go for the free one which limits us to 100 daily requests.

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But that's more than enough to complete our challenge.

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So now if you click on get an API key fill in your email and your name the title you can leave us students

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and company size leave as one to 10 and then click on get a free API key and then go into the email

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that you typed in and you should find an email from KOIN API dot Io giving you access to your API key.

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So then the final U.R.L. that you're looking at will look something like this.

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So it's rest coin API dot I O slash version 1 V1 slash exchange rate slash the cryptocurrency and then

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slash the fiat currency and all of these symbols already listed in the starting projects so you don't

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have to worry about that.

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And then at the end of the URL we can tag on the API key just like what we did with the parameters in

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the open weather map API and then we can set it equal to the API that they sent us through email like

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this.

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And now when I go ahead and hit enter you can see it gives me back that data and the current price of

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bitcoin in U.S. dollars and this works for of course any other currency.

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So say if we wanted to know it in euros or if we wanted to know the price of Varian.

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So this is going to be the U.R.L. that you're going to be working with in order to complete this challenge.