Mobelis · January 11, 2018 00:43 · Jan 11, 2018
diff --git a/KrakenPriceTicker.sol b/KrakenPriceTicker.sol
@@ -0,0 +1,41 @@
+/*
+   Kraken-based ETH/XBT price ticker
+
+   This contract keeps in storage an updated ETH/XBT price,
+   which is updated every ~60 seconds.
+*/
+
+pragma solidity ^0.4.0;
+import "github.com/oraclize/ethereum-api/oraclizeAPI.sol";
+
+contract KrakenPriceTicker is usingOraclize {
+
+    uint8 public ETHXBT;
+
+    event newOraclizeQuery(string description);
+    event newKrakenPriceTicker(uint8 price);
+
+
+    function KrakenPriceTicker() public {
+        oraclize_setProof(proofType_TLSNotary | proofStorage_IPFS);
+        ETHXBT = 0;
+        update();
+    }
+
+    function __callback(bytes32 myid, string result, bytes proof) public {
+        if (msg.sender != oraclize_cbAddress()) throw;
+        ETHXBT = ETHXBT + 1;
+        newKrakenPriceTicker(ETHXBT);
+        update();
+    }
+
+    function update() payable public {
+        if (oraclize.getPrice("URL") > this.balance) {
+            newOraclizeQuery("Oraclize query was NOT sent, please add some ETH to cover for the query fee");
+        } else {
+            newOraclizeQuery("Oraclize query counter");
+            oraclize_query(60, "URL", "");
+        }
+    }
+
+}