What are best Api's to get competitive crypto rates of different exchanges by currency?

What are best Api's to get competitive crypto rates of different exchanges by currency?

I am working on side project to extract real time crypto currency exchange rates from third party apis, inspired from http://bitcoin-analytics.com/

There is https://coincap.io/ and they also provide https://graphql.coincap.io/.

My question is, is there any chance to get such data by passing only currency parameters and getting the competitive rate.

If you have any idea or reference, please do help. Thanks for your time.

http://bit.ly/2Wwef1Z

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