Fairly easy,for making the  Bitcoin Price Index,use the following API's :-

http://www.coindesk.com/api/
https://bitcoinaverage.com/en/bitcoin-price/btc-to-usd
Collective List of all the API's https://bitcoinaverage.com/en/api-collections
https://www.quandl.com/collections/markets/bitcoin-data

For,Bitcoin Price Ticker,
http://www.coindesk.com/price/bitcoin-price-ticker-widget/
Collective List of all the API's https://www.cryptonator.com/widget
http://exadex.org/bitcointicker/

For the later part,that is All Cryptos Market Cap,use the following API's :-
https://coinmarketcap.com/api/
http://www.coincap.io/
https://bter.com/api

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