Orcalize

Coinprice.sol

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+pragma solidity ^0.4.20;
+/*
+  Import the Oraclize contract
+
+  Outside of Remix, direct imports from GitHub may not be supported.
+  Instead, use a local import or just paste the Oraclize code in directly
+*/
+import "./OraclizeI.sol";
+
+contract Coinprice is usingOraclize {
+
+    // Define variables
+    uint public USDPrice; // number obtained from random.org
+
+    // Constructor
+    function Template() public  {
+        // do any setup here
+    }
+
+    // Query Oraclize to get random number
+    function getPriceOfEther() public payable {
+        // require ETH to cover callback gas costs
+        require(msg.value >= 0.004 ether); // 200,000 gas * 20 Gwei = 0.004 ETH
+
+        // send query
+        bytes32 queryId = oraclize_query( 
+          "nested", 
+          "[URL] ['json(https://api.coinmarketcap.com/v2/ticker/1027/).data.quotes.USD.price']"
+        );
+    }
+
+    // Callback function for Oraclize once it retreives the data 
+    function __callback(bytes32 queryId, string result, bytes proof) public {
+        // only allow Oraclize to call this function
+        require(msg.sender == oraclize_cbAddress());
+
+        // set random number, result is of the form: [268]
+        // if we also returned serialNumber, form would be "[3008768, [268]]"
+        USDPrice = parseInt(result); 
+    }
+
+}