Bitcoin SUCCESS sees Australia pledge creation of price stable gold-backed cryptocurrency

A number of cryptocurrencies have risen in popularity over the past 12 months with bitcoin, Ripple, and Ethereum all seeing surges. Richard Hayes, Chief Executive of Perth Mint said: “I think as the world moves through times of increasing uncertainty, you're seeing people look for alternate offerings.
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Why Ticker API is not stable?

I am trying to use Ticker API ( to get current BTC price in USD.

The interesting thing is that script not every time returns the same value. When you visit this page directly, none of the values never changes (well just every 15mins), but on the script it changes on every nth refresh of the page.

Something similar happens if you go to with at least a question mark added. Just refresh it a lot and you will see.

Why this is happening and how to get a stable price every 15mins as their API should provide it?

The script I use:

$  api = ""; $  json = file_get_contents($  api); $  data = json_decode($  json, TRUE); $  rate = $  data["USD"]["sell"]; echo $  rate; 

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