9 files changed, 399 insertions, 515 deletions

diff --git a/src/artifacts/EtherToken.json b/src/artifacts/EtherToken.json
index 49f8541c4..9af54bf93 100644
--- a/src/artifacts/EtherToken.json
+++ b/src/artifacts/EtherToken.json
@@ -233,8 +233,59 @@
       "type": "event"
     }
   ],
-  "unlinked_binary": "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",
+  "unlinked_binary": "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",
   "networks": {
+    "50": {
+      "links": {},
+      "events": {
+        "0xddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef": {
+          "anonymous": false,
+          "inputs": [
+            {
+              "indexed": true,
+              "name": "_from",
+              "type": "address"
+            },
+            {
+              "indexed": true,
+              "name": "_to",
+              "type": "address"
+            },
+            {
+              "indexed": false,
+              "name": "_value",
+              "type": "uint256"
+            }
+          ],
+          "name": "Transfer",
+          "type": "event"
+        },
+        "0x8c5be1e5ebec7d5bd14f71427d1e84f3dd0314c0f7b2291e5b200ac8c7c3b925": {
+          "anonymous": false,
+          "inputs": [
+            {
+              "indexed": true,
+              "name": "_owner",
+              "type": "address"
+            },
+            {
+              "indexed": true,
+              "name": "_spender",
+              "type": "address"
+            },
+            {
+              "indexed": false,
+              "name": "_value",
+              "type": "uint256"
+            }
+          ],
+          "name": "Approval",
+          "type": "event"
+        }
+      },
+      "updated_at": 1502391794392,
+      "address": "0x48bacb9266a570d521063ef5dd96e61686dbe788"
+    },
     "42": {
       "links": {},
       "events": {
@@ -283,10 +334,10 @@
           "type": "event"
         }
       },
-      "updated_at": 1496294576956,
-      "address": "0x771a1bff4a50b59407bee508e9934e8c10feac3e"
+      "updated_at": 1502391794392,
+      "address": "0x05d090b51c40b020eab3bfcb6a2dff130df22e9c"
     },
-    "50": {
+    "1": {
       "links": {},
       "events": {
         "0xddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef": {
@@ -334,10 +385,10 @@
           "type": "event"
         }
       },
-      "updated_at": 1499462280317,
-      "address": "0x48bacb9266a570d521063ef5dd96e61686dbe788"
+      "updated_at": 1502488087000,
+      "address": "0x2956356cd2a2bf3202f771f50d3d14a367b48070"
     }
   },
   "schema_version": "0.0.5",
-  "updated_at": 1499462280317
-}
\ No newline at end of file
+  "updated_at": 1502391794392
+}
diff --git a/src/artifacts/Exchange.json b/src/artifacts/Exchange.json
index a9481d13f..a7eadbe53 100644
--- a/src/artifacts/Exchange.json
+++ b/src/artifacts/Exchange.json
@@ -13,14 +13,14 @@
           "type": "uint256[6]"
         },
         {
-          "name": "canceltakerTokenAmount",
+          "name": "cancelTakerTokenAmount",
           "type": "uint256"
         }
       ],
       "name": "cancelOrder",
       "outputs": [
         {
-          "name": "cancelledTakerTokenAmount",
+          "name": "",
           "type": "uint256"
         }
       ],
@@ -31,11 +31,11 @@
       "constant": true,
       "inputs": [
         {
-          "name": "denominator",
+          "name": "numerator",
           "type": "uint256"
         },
         {
-          "name": "numerator",
+          "name": "denominator",
           "type": "uint256"
         },
         {
@@ -46,7 +46,7 @@
       "name": "isRoundingError",
       "outputs": [
         {
-          "name": "isError",
+          "name": "",
           "type": "bool"
         }
       ],
@@ -108,7 +108,7 @@
       "name": "getPartialAmount",
       "outputs": [
         {
-          "name": "partialValue",
+          "name": "",
           "type": "uint256"
         }
       ],
@@ -132,12 +132,7 @@
         }
       ],
       "name": "batchCancelOrders",
-      "outputs": [
-        {
-          "name": "success",
-          "type": "bool"
-        }
-      ],
+      "outputs": [],
       "payable": false,
       "type": "function"
     },
@@ -176,7 +171,7 @@
       "name": "fillOrdersUpTo",
       "outputs": [
         {
-          "name": "filledTakerTokenAmount",
+          "name": "",
           "type": "uint256"
         }
       ],
@@ -210,7 +205,7 @@
       "name": "isValidSignature",
       "outputs": [
         {
-          "name": "isValid",
+          "name": "",
           "type": "bool"
         }
       ],
@@ -292,12 +287,7 @@
         }
       ],
       "name": "batchFillOrders",
-      "outputs": [
-        {
-          "name": "success",
-          "type": "bool"
-        }
-      ],
+      "outputs": [],
       "payable": false,
       "type": "function"
     },
@@ -330,19 +320,14 @@
         }
       ],
       "name": "batchFillOrKillOrders",
-      "outputs": [
-        {
-          "name": "success",
-          "type": "bool"
-        }
-      ],
+      "outputs": [],
       "payable": false,
       "type": "function"
     },
     {
       "constant": true,
       "inputs": [],
-      "name": "PROXY_CONTRACT",
+      "name": "TOKEN_TRANSFER_PROXY_CONTRACT",
       "outputs": [
         {
           "name": "",
@@ -363,7 +348,7 @@
       "name": "getUnavailableTakerTokenAmount",
       "outputs": [
         {
-          "name": "unavailableTakerTokenAmount",
+          "name": "",
           "type": "uint256"
         }
       ],
@@ -385,7 +370,7 @@
       "name": "getOrderHash",
       "outputs": [
         {
-          "name": "orderHash",
+          "name": "",
           "type": "bytes32"
         }
       ],
@@ -434,23 +419,18 @@
         }
       ],
       "name": "fillOrKillOrder",
-      "outputs": [
-        {
-          "name": "success",
-          "type": "bool"
-        }
-      ],
+      "outputs": [],
       "payable": false,
       "type": "function"
     },
     {
       "inputs": [
         {
-          "name": "_ZRX_TOKEN_CONTRACT",
+          "name": "_zrxToken",
           "type": "address"
         },
         {
-          "name": "_PROXY_CONTRACT",
+          "name": "_tokenTransferProxy",
           "type": "address"
         }
       ],
@@ -582,11 +562,37 @@
       ],
       "name": "LogError",
       "type": "event"
+  },
+    {
+      "constant": true,
+      "inputs": [],
+      "name": "EXTERNAL_QUERY_GAS_LIMIT",
+      "outputs": [
+        {
+          "name": "",
+          "type": "uint16"
+        }
+      ],
+      "payable": false,
+      "type": "function"
+    },
+    {
+      "constant": true,
+      "inputs": [],
+      "name": "VERSION",
+      "outputs": [
+        {
+          "name": "",
+          "type": "string"
+        }
+      ],
+      "payable": false,
+      "type": "function"
     }
   ],
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   "networks": {
-    "42": {
+    "50": {
       "links": {},
       "events": {
         "0x0d0b9391970d9a25552f37d436d2aae2925e2bfe1b2a923754bada030c498cb3": {
@@ -716,13 +722,13 @@
           "type": "event"
         }
       },
-      "updated_at": 1499299724252,
-      "address": "0x63869171a246622ef8f9234879ce2c06cebd85f6"
+      "updated_at": 1502391794390,
+      "address": "0xb69e673309512a9d726f87304c6984054f87a93b"
     },
-    "50": {
+    "42": {
       "links": {},
       "events": {
-        "0xcf8bd4f6ec4f39997290cf18413805f1f190eebd60e32ffc174b56d07a355beb": {
+        "0x0d0b9391970d9a25552f37d436d2aae2925e2bfe1b2a923754bada030c498cb3": {
           "anonymous": false,
           "inputs": [
             {
@@ -752,37 +758,22 @@
             },
             {
               "indexed": false,
-              "name": "filledBy",
-              "type": "address"
-            },
-            {
-              "indexed": false,
-              "name": "makerTokenAmount",
-              "type": "uint256"
-            },
-            {
-              "indexed": false,
-              "name": "takerTokenAmount",
-              "type": "uint256"
-            },
-            {
-              "indexed": false,
-              "name": "makerFee",
+              "name": "filledMakerTokenAmount",
               "type": "uint256"
             },
             {
               "indexed": false,
-              "name": "takerFee",
+              "name": "filledTakerTokenAmount",
               "type": "uint256"
             },
             {
               "indexed": false,
-              "name": "expirationTimestampInSec",
+              "name": "paidMakerFee",
               "type": "uint256"
             },
             {
               "indexed": false,
-              "name": "filledTakerTokenAmount",
+              "name": "paidTakerFee",
               "type": "uint256"
             },
             {
@@ -799,7 +790,7 @@
           "name": "LogFill",
           "type": "event"
         },
-        "0x4565177cd5184f550db0ab57b1d5bc808f8e8ba0adcb13fb257f1e7cf019a2b6": {
+        "0x67d66f160bc93d925d05dae1794c90d2d6d6688b29b84ff069398a9b04587131": {
           "anonymous": false,
           "inputs": [
             {
@@ -824,32 +815,12 @@
             },
             {
               "indexed": false,
-              "name": "makerTokenAmount",
-              "type": "uint256"
-            },
-            {
-              "indexed": false,
-              "name": "takerTokenAmount",
-              "type": "uint256"
-            },
-            {
-              "indexed": false,
-              "name": "makerFee",
-              "type": "uint256"
-            },
-            {
-              "indexed": false,
-              "name": "takerFee",
-              "type": "uint256"
-            },
-            {
-              "indexed": false,
-              "name": "expirationTimestampInSec",
+              "name": "cancelledMakerTokenAmount",
               "type": "uint256"
             },
             {
               "indexed": false,
-              "name": "cancelledtakerTokenAmount",
+              "name": "cancelledTakerTokenAmount",
               "type": "uint256"
             },
             {
@@ -882,7 +853,14 @@
           ],
           "name": "LogError",
           "type": "event"
-        },
+        }
+      },
+      "updated_at": 1502391794390,
+      "address": "0x90fe2af704b34e0224bf2299c838e04d4dcf1364"
+    },
+    "1": {
+      "links": {},
+      "events": {
         "0x0d0b9391970d9a25552f37d436d2aae2925e2bfe1b2a923754bada030c498cb3": {
           "anonymous": false,
           "inputs": [
@@ -991,12 +969,29 @@
           ],
           "name": "LogCancel",
           "type": "event"
+        },
+        "0x36d86c59e00bd73dc19ba3adfe068e4b64ac7e92be35546adeddf1b956a87e90": {
+          "anonymous": false,
+          "inputs": [
+            {
+              "indexed": true,
+              "name": "errorId",
+              "type": "uint8"
+            },
+            {
+              "indexed": true,
+              "name": "orderHash",
+              "type": "bytes32"
+            }
+          ],
+          "name": "LogError",
+          "type": "event"
         }
       },
-      "updated_at": 1499462280316,
-      "address": "0xb69e673309512a9d726f87304c6984054f87a93b"
+      "updated_at": 1502480340000,
+      "address": "0x12459C951127e0c374FF9105DdA097662A027093"
     }
   },
   "schema_version": "0.0.5",
-  "updated_at": 1499462280316
+  "updated_at": 1502391794390
 }
diff --git a/src/artifacts/Mintable.json b/src/artifacts/Mintable.json
deleted file mode 100644
index 9dd879108..000000000
--- a/src/artifacts/Mintable.json
+++ /dev/null
@@ -1,189 +0,0 @@
-{
-  "contract_name": "Mintable",
-  "abi": [
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "name": "_spender",
-          "type": "address"
-        },
-        {
-          "name": "_value",
-          "type": "uint256"
-        }
-      ],
-      "name": "approve",
-      "outputs": [
-        {
-          "name": "success",
-          "type": "bool"
-        }
-      ],
-      "payable": false,
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "totalSupply",
-      "outputs": [
-        {
-          "name": "",
-          "type": "uint256"
-        }
-      ],
-      "payable": false,
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "name": "_from",
-          "type": "address"
-        },
-        {
-          "name": "_to",
-          "type": "address"
-        },
-        {
-          "name": "_value",
-          "type": "uint256"
-        }
-      ],
-      "name": "transferFrom",
-      "outputs": [
-        {
-          "name": "success",
-          "type": "bool"
-        }
-      ],
-      "payable": false,
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [
-        {
-          "name": "_owner",
-          "type": "address"
-        }
-      ],
-      "name": "balanceOf",
-      "outputs": [
-        {
-          "name": "balance",
-          "type": "uint256"
-        }
-      ],
-      "payable": false,
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "name": "_value",
-          "type": "uint256"
-        }
-      ],
-      "name": "mint",
-      "outputs": [],
-      "payable": false,
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "name": "_to",
-          "type": "address"
-        },
-        {
-          "name": "_value",
-          "type": "uint256"
-        }
-      ],
-      "name": "transfer",
-      "outputs": [
-        {
-          "name": "success",
-          "type": "bool"
-        }
-      ],
-      "payable": false,
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [
-        {
-          "name": "_owner",
-          "type": "address"
-        },
-        {
-          "name": "_spender",
-          "type": "address"
-        }
-      ],
-      "name": "allowance",
-      "outputs": [
-        {
-          "name": "remaining",
-          "type": "uint256"
-        }
-      ],
-      "payable": false,
-      "type": "function"
-    },
-    {
-      "anonymous": false,
-      "inputs": [
-        {
-          "indexed": true,
-          "name": "_from",
-          "type": "address"
-        },
-        {
-          "indexed": true,
-          "name": "_to",
-          "type": "address"
-        },
-        {
-          "indexed": false,
-          "name": "_value",
-          "type": "uint256"
-        }
-      ],
-      "name": "Transfer",
-      "type": "event"
-    },
-    {
-      "anonymous": false,
-      "inputs": [
-        {
-          "indexed": true,
-          "name": "_owner",
-          "type": "address"
-        },
-        {
-          "indexed": true,
-          "name": "_spender",
-          "type": "address"
-        },
-        {
-          "indexed": false,
-          "name": "_value",
-          "type": "uint256"
-        }
-      ],
-      "name": "Approval",
-      "type": "event"
-    }
-  ],
-  "unlinked_binary": "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",
-  "networks": {},
-  "schema_version": "0.0.5",
-  "updated_at": 1499462278466
-}
\ No newline at end of file
diff --git a/src/artifacts/Token.json b/src/artifacts/Token.json
index cfb56586e..9487c0782 100644
--- a/src/artifacts/Token.json
+++ b/src/artifacts/Token.json
@@ -169,8 +169,8 @@
       "type": "event"
     }
   ],
-  "unlinked_binary": "0x6060604052341561000c57fe5b5b6101e08061001c6000396000f3006060604052361561005c5763ffffffff60e060020a600035041663095ea7b3811461005e57806318160ddd1461009157806323b872dd146100b357806370a08231146100ec578063a9059cbb1461005e578063dd62ed3e1461014d575bfe5b341561006657fe5b61007d600160a060020a0360043516602435610181565b604080519115158252519081900360200190f35b341561009957fe5b6100a161018a565b60408051918252519081900360200190f35b34156100bb57fe5b61007d600160a060020a0360043581169060243516604435610190565b604080519115158252519081900360200190f35b34156100f457fe5b6100a1600160a060020a036004351661019a565b60408051918252519081900360200190f35b341561006657fe5b61007d600160a060020a0360043516602435610181565b604080519115158252519081900360200190f35b341561015557fe5b6100a1600160a060020a0360043581169060243516610181565b60408051918252519081900360200190f35b60005b92915050565b60005b90565b60005b9392505050565b60005b919050565b60005b92915050565b60005b929150505600a165627a7a72305820fdbf6d7c43240d51b292524e87c255de3b211ebfa0c7d4b726d8dc0da2a05e180029",
+  "unlinked_binary": "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",
   "networks": {},
   "schema_version": "0.0.5",
-  "updated_at": 1499462278465
+  "updated_at": 1502391792217
 }
\ No newline at end of file
diff --git a/src/artifacts/TokenRegistry.json b/src/artifacts/TokenRegistry.json
index 7eb24c3d9..7683b8530 100644
--- a/src/artifacts/TokenRegistry.json
+++ b/src/artifacts/TokenRegistry.json
@@ -12,7 +12,7 @@
       "name": "getTokenAddressByName",
       "outputs": [
         {
-          "name": "tokenAddress",
+          "name": "",
           "type": "address"
         }
       ],
@@ -28,7 +28,7 @@
         },
         {
           "name": "_ipfsHash",
-          "type": "bytes32"
+          "type": "bytes"
         }
       ],
       "name": "setTokenIpfsHash",
@@ -47,7 +47,7 @@
       "name": "getTokenAddressBySymbol",
       "outputs": [
         {
-          "name": "tokenAddress",
+          "name": "",
           "type": "address"
         }
       ],
@@ -60,6 +60,10 @@
         {
           "name": "_token",
           "type": "address"
+        },
+        {
+          "name": "_index",
+          "type": "uint256"
         }
       ],
       "name": "removeToken",
@@ -78,32 +82,28 @@
       "name": "getTokenMetaData",
       "outputs": [
         {
-          "name": "tokenAddress",
+          "name": "",
           "type": "address"
         },
         {
-          "name": "name",
-          "type": "string"
-        },
-        {
-          "name": "symbol",
+          "name": "",
           "type": "string"
         },
         {
-          "name": "url",
+          "name": "",
           "type": "string"
         },
         {
-          "name": "decimals",
+          "name": "",
           "type": "uint8"
         },
         {
-          "name": "ipfsHash",
-          "type": "bytes32"
+          "name": "",
+          "type": "bytes"
         },
         {
-          "name": "swarmHash",
-          "type": "bytes32"
+          "name": "",
+          "type": "bytes"
         }
       ],
       "payable": false,
@@ -130,23 +130,6 @@
           "type": "address"
         },
         {
-          "name": "_url",
-          "type": "string"
-        }
-      ],
-      "name": "setTokenUrl",
-      "outputs": [],
-      "payable": false,
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "name": "_token",
-          "type": "address"
-        },
-        {
           "name": "_name",
           "type": "string"
         },
@@ -155,20 +138,16 @@
           "type": "string"
         },
         {
-          "name": "_url",
-          "type": "string"
-        },
-        {
           "name": "_decimals",
           "type": "uint8"
         },
         {
           "name": "_ipfsHash",
-          "type": "bytes32"
+          "type": "bytes"
         },
         {
           "name": "_swarmHash",
-          "type": "bytes32"
+          "type": "bytes"
         }
       ],
       "name": "addToken",
@@ -216,20 +195,16 @@
           "type": "string"
         },
         {
-          "name": "url",
-          "type": "string"
-        },
-        {
           "name": "decimals",
           "type": "uint8"
         },
         {
           "name": "ipfsHash",
-          "type": "bytes32"
+          "type": "bytes"
         },
         {
           "name": "swarmHash",
-          "type": "bytes32"
+          "type": "bytes"
         }
       ],
       "payable": false,
@@ -264,32 +239,28 @@
       "name": "getTokenByName",
       "outputs": [
         {
-          "name": "tokenAddress",
+          "name": "",
           "type": "address"
         },
         {
-          "name": "name",
-          "type": "string"
-        },
-        {
-          "name": "symbol",
+          "name": "",
           "type": "string"
         },
         {
-          "name": "url",
+          "name": "",
           "type": "string"
         },
         {
-          "name": "decimals",
+          "name": "",
           "type": "uint8"
         },
         {
-          "name": "ipfsHash",
-          "type": "bytes32"
+          "name": "",
+          "type": "bytes"
         },
         {
-          "name": "swarmHash",
-          "type": "bytes32"
+          "name": "",
+          "type": "bytes"
         }
       ],
       "payable": false,
@@ -304,7 +275,7 @@
         },
         {
           "name": "_swarmHash",
-          "type": "bytes32"
+          "type": "bytes"
         }
       ],
       "name": "setTokenSwarmHash",
@@ -336,32 +307,28 @@
       "name": "getTokenBySymbol",
       "outputs": [
         {
-          "name": "tokenAddress",
+          "name": "",
           "type": "address"
         },
         {
-          "name": "name",
-          "type": "string"
-        },
-        {
-          "name": "symbol",
+          "name": "",
           "type": "string"
         },
         {
-          "name": "url",
+          "name": "",
           "type": "string"
         },
         {
-          "name": "decimals",
+          "name": "",
           "type": "uint8"
         },
         {
-          "name": "ipfsHash",
-          "type": "bytes32"
+          "name": "",
+          "type": "bytes"
         },
         {
-          "name": "swarmHash",
-          "type": "bytes32"
+          "name": "",
+          "type": "bytes"
         }
       ],
       "payable": false,
@@ -401,7 +368,7 @@
       "anonymous": false,
       "inputs": [
         {
-          "indexed": false,
+          "indexed": true,
           "name": "token",
           "type": "address"
         },
@@ -417,23 +384,18 @@
         },
         {
           "indexed": false,
-          "name": "url",
-          "type": "string"
-        },
-        {
-          "indexed": false,
           "name": "decimals",
           "type": "uint8"
         },
         {
           "indexed": false,
           "name": "ipfsHash",
-          "type": "bytes32"
+          "type": "bytes"
         },
         {
           "indexed": false,
           "name": "swarmHash",
-          "type": "bytes32"
+          "type": "bytes"
         }
       ],
       "name": "LogAddToken",
@@ -443,7 +405,7 @@
       "anonymous": false,
       "inputs": [
         {
-          "indexed": false,
+          "indexed": true,
           "name": "token",
           "type": "address"
         },
@@ -459,23 +421,18 @@
         },
         {
           "indexed": false,
-          "name": "url",
-          "type": "string"
-        },
-        {
-          "indexed": false,
           "name": "decimals",
           "type": "uint8"
         },
         {
           "indexed": false,
           "name": "ipfsHash",
-          "type": "bytes32"
+          "type": "bytes"
         },
         {
           "indexed": false,
           "name": "swarmHash",
-          "type": "bytes32"
+          "type": "bytes"
         }
       ],
       "name": "LogRemoveToken",
@@ -485,7 +442,7 @@
       "anonymous": false,
       "inputs": [
         {
-          "indexed": false,
+          "indexed": true,
           "name": "token",
           "type": "address"
         },
@@ -507,7 +464,7 @@
       "anonymous": false,
       "inputs": [
         {
-          "indexed": false,
+          "indexed": true,
           "name": "token",
           "type": "address"
         },
@@ -529,41 +486,19 @@
       "anonymous": false,
       "inputs": [
         {
-          "indexed": false,
-          "name": "token",
-          "type": "address"
-        },
-        {
-          "indexed": false,
-          "name": "oldUrl",
-          "type": "string"
-        },
-        {
-          "indexed": false,
-          "name": "newUrl",
-          "type": "string"
-        }
-      ],
-      "name": "LogTokenUrlChange",
-      "type": "event"
-    },
-    {
-      "anonymous": false,
-      "inputs": [
-        {
-          "indexed": false,
+          "indexed": true,
           "name": "token",
           "type": "address"
         },
         {
           "indexed": false,
           "name": "oldIpfsHash",
-          "type": "bytes32"
+          "type": "bytes"
         },
         {
           "indexed": false,
           "name": "newIpfsHash",
-          "type": "bytes32"
+          "type": "bytes"
         }
       ],
       "name": "LogTokenIpfsHashChange",
@@ -573,35 +508,35 @@
       "anonymous": false,
       "inputs": [
         {
-          "indexed": false,
+          "indexed": true,
           "name": "token",
           "type": "address"
         },
         {
           "indexed": false,
           "name": "oldSwarmHash",
-          "type": "bytes32"
+          "type": "bytes"
         },
         {
           "indexed": false,
           "name": "newSwarmHash",
-          "type": "bytes32"
+          "type": "bytes"
         }
       ],
       "name": "LogTokenSwarmHashChange",
       "type": "event"
     }
   ],
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-              "indexed": false,
+              "indexed": true,
               "name": "token",
               "type": "address"
             },
@@ -617,33 +552,28 @@
             },
             {
               "indexed": false,
-              "name": "url",
-              "type": "string"
-            },
-            {
-              "indexed": false,
               "name": "decimals",
               "type": "uint8"
             },
             {
               "indexed": false,
               "name": "ipfsHash",
-              "type": "bytes32"
+              "type": "bytes"
             },
             {
               "indexed": false,
               "name": "swarmHash",
-              "type": "bytes32"
+              "type": "bytes"
             }
           ],
           "name": "LogAddToken",
           "type": "event"
         },
-        "0xc9ec69d3b744b4ec70f035ed0a15ed7029e668bfb9f326e657878b2b38a90da2": {
+        "0x32c54f1e2ea75844ded7517e7dbcd3895da7cd0c28f9ab9f9cf6ecf5f83762c6": {
           "anonymous": false,
           "inputs": [
             {
-              "indexed": false,
+              "indexed": true,
               "name": "token",
               "type": "address"
             },
@@ -659,23 +589,18 @@
             },
             {
               "indexed": false,
-              "name": "url",
-              "type": "string"
-            },
-            {
-              "indexed": false,
               "name": "decimals",
               "type": "uint8"
             },
             {
               "indexed": false,
               "name": "ipfsHash",
-              "type": "bytes32"
+              "type": "bytes"
             },
             {
               "indexed": false,
               "name": "swarmHash",
-              "type": "bytes32"
+              "type": "bytes"
             }
           ],
           "name": "LogRemoveToken",
@@ -685,7 +610,7 @@
           "anonymous": false,
           "inputs": [
             {
-              "indexed": false,
+              "indexed": true,
               "name": "token",
               "type": "address"
             },
@@ -707,7 +632,7 @@
           "anonymous": false,
           "inputs": [
             {
-              "indexed": false,
+              "indexed": true,
               "name": "token",
               "type": "address"
             },
@@ -725,84 +650,62 @@
           "name": "LogTokenSymbolChange",
           "type": "event"
         },
-        "0x6b45310c970f5d74814e429bdacd69c748dcb086cd38b6ddb7c2029be609e168": {
+        "0x5b19f79ac4e8cfa820815502e11615f1a449e28155dc289ec5cac1a11f908694": {
           "anonymous": false,
           "inputs": [
             {
-              "indexed": false,
-              "name": "token",
-              "type": "address"
-            },
-            {
-              "indexed": false,
-              "name": "oldUrl",
-              "type": "string"
-            },
-            {
-              "indexed": false,
-              "name": "newUrl",
-              "type": "string"
-            }
-          ],
-          "name": "LogTokenUrlChange",
-          "type": "event"
-        },
-        "0xe46a8f26cfc48c12e40cf50c1063e5913b2a17da6aa396f9b008b2dfd6f273b5": {
-          "anonymous": false,
-          "inputs": [
-            {
-              "indexed": false,
+              "indexed": true,
               "name": "token",
               "type": "address"
             },
             {
               "indexed": false,
               "name": "oldIpfsHash",
-              "type": "bytes32"
+              "type": "bytes"
             },
             {
               "indexed": false,
               "name": "newIpfsHash",
-              "type": "bytes32"
+              "type": "bytes"
             }
           ],
           "name": "LogTokenIpfsHashChange",
           "type": "event"
         },
-        "0xa9fd216856477e73d11c1a9140fa3d425fce2e10a5475a996440b31c2e8f1ea4": {
+        "0xc3168fdc13112e44a031057dbf6c609b33353addb4d8037d24543e22cbfe2acd": {
           "anonymous": false,
           "inputs": [
             {
-              "indexed": false,
+              "indexed": true,
               "name": "token",
               "type": "address"
             },
             {
               "indexed": false,
               "name": "oldSwarmHash",
-              "type": "bytes32"
+              "type": "bytes"
             },
             {
               "indexed": false,
               "name": "newSwarmHash",
-              "type": "bytes32"
+              "type": "bytes"
             }
           ],
           "name": "LogTokenSwarmHashChange",
           "type": "event"
         }
       },
-      "updated_at": 1496294576947,
-      "address": "0x0fea265f59495859467e648ec99a87549aa6ede0"
+      "updated_at": 1502391794385,
+      "address": "0x0b1ba0af832d7c05fd64161e0db78e85978e8082"
     },
-    "50": {
+    "42": {
       "links": {},
       "events": {
-        "0x469f18a43061267ac6162ca1cec0c14a425189c7a19f52d6dc04419f3c12bb24": {
+        "0xd8d928b0b50ca11d9dc273236b46f3526515b03602f71f3a6af4f45bd9fa9144": {
           "anonymous": false,
           "inputs": [
             {
-              "indexed": false,
+              "indexed": true,
               "name": "token",
               "type": "address"
             },
@@ -818,33 +721,28 @@
             },
             {
               "indexed": false,
-              "name": "url",
-              "type": "string"
-            },
-            {
-              "indexed": false,
               "name": "decimals",
               "type": "uint8"
             },
             {
               "indexed": false,
               "name": "ipfsHash",
-              "type": "bytes32"
+              "type": "bytes"
             },
             {
               "indexed": false,
               "name": "swarmHash",
-              "type": "bytes32"
+              "type": "bytes"
             }
           ],
           "name": "LogAddToken",
           "type": "event"
         },
-        "0xc9ec69d3b744b4ec70f035ed0a15ed7029e668bfb9f326e657878b2b38a90da2": {
+        "0x32c54f1e2ea75844ded7517e7dbcd3895da7cd0c28f9ab9f9cf6ecf5f83762c6": {
           "anonymous": false,
           "inputs": [
             {
-              "indexed": false,
+              "indexed": true,
               "name": "token",
               "type": "address"
             },
@@ -860,23 +758,18 @@
             },
             {
               "indexed": false,
-              "name": "url",
-              "type": "string"
-            },
-            {
-              "indexed": false,
               "name": "decimals",
               "type": "uint8"
             },
             {
               "indexed": false,
               "name": "ipfsHash",
-              "type": "bytes32"
+              "type": "bytes"
             },
             {
               "indexed": false,
               "name": "swarmHash",
-              "type": "bytes32"
+              "type": "bytes"
             }
           ],
           "name": "LogRemoveToken",
@@ -886,7 +779,7 @@
           "anonymous": false,
           "inputs": [
             {
-              "indexed": false,
+              "indexed": true,
               "name": "token",
               "type": "address"
             },
@@ -908,7 +801,7 @@
           "anonymous": false,
           "inputs": [
             {
-              "indexed": false,
+              "indexed": true,
               "name": "token",
               "type": "address"
             },
@@ -926,77 +819,224 @@
           "name": "LogTokenSymbolChange",
           "type": "event"
         },
-        "0x6b45310c970f5d74814e429bdacd69c748dcb086cd38b6ddb7c2029be609e168": {
+        "0x5b19f79ac4e8cfa820815502e11615f1a449e28155dc289ec5cac1a11f908694": {
+          "anonymous": false,
+          "inputs": [
+            {
+              "indexed": true,
+              "name": "token",
+              "type": "address"
+            },
+            {
+              "indexed": false,
+              "name": "oldIpfsHash",
+              "type": "bytes"
+            },
+            {
+              "indexed": false,
+              "name": "newIpfsHash",
+              "type": "bytes"
+            }
+          ],
+          "name": "LogTokenIpfsHashChange",
+          "type": "event"
+        },
+        "0xc3168fdc13112e44a031057dbf6c609b33353addb4d8037d24543e22cbfe2acd": {
+          "anonymous": false,
+          "inputs": [
+            {
+              "indexed": true,
+              "name": "token",
+              "type": "address"
+            },
+            {
+              "indexed": false,
+              "name": "oldSwarmHash",
+              "type": "bytes"
+            },
+            {
+              "indexed": false,
+              "name": "newSwarmHash",
+              "type": "bytes"
+            }
+          ],
+          "name": "LogTokenSwarmHashChange",
+          "type": "event"
+        }
+      },
+      "updated_at": 1502391794385,
+      "address": "0xf18e504561f4347bea557f3d4558f559dddbae7f"
+    },
+    "1": {
+      "links": {},
+      "events": {
+        "0xd8d928b0b50ca11d9dc273236b46f3526515b03602f71f3a6af4f45bd9fa9144": {
+          "anonymous": false,
+          "inputs": [
+            {
+              "indexed": true,
+              "name": "token",
+              "type": "address"
+            },
+            {
+              "indexed": false,
+              "name": "name",
+              "type": "string"
+            },
+            {
+              "indexed": false,
+              "name": "symbol",
+              "type": "string"
+            },
+            {
+              "indexed": false,
+              "name": "decimals",
+              "type": "uint8"
+            },
+            {
+              "indexed": false,
+              "name": "ipfsHash",
+              "type": "bytes"
+            },
+            {
+              "indexed": false,
+              "name": "swarmHash",
+              "type": "bytes"
+            }
+          ],
+          "name": "LogAddToken",
+          "type": "event"
+        },
+        "0x32c54f1e2ea75844ded7517e7dbcd3895da7cd0c28f9ab9f9cf6ecf5f83762c6": {
           "anonymous": false,
           "inputs": [
             {
+              "indexed": true,
+              "name": "token",
+              "type": "address"
+            },
+            {
+              "indexed": false,
+              "name": "name",
+              "type": "string"
+            },
+            {
+              "indexed": false,
+              "name": "symbol",
+              "type": "string"
+            },
+            {
+              "indexed": false,
+              "name": "decimals",
+              "type": "uint8"
+            },
+            {
+              "indexed": false,
+              "name": "ipfsHash",
+              "type": "bytes"
+            },
+            {
               "indexed": false,
+              "name": "swarmHash",
+              "type": "bytes"
+            }
+          ],
+          "name": "LogRemoveToken",
+          "type": "event"
+        },
+        "0x4a6dbfc867b179991dec22ff19960f0a94d8d9d891fc556f547764670340e8ae": {
+          "anonymous": false,
+          "inputs": [
+            {
+              "indexed": true,
               "name": "token",
               "type": "address"
             },
             {
               "indexed": false,
-              "name": "oldUrl",
+              "name": "oldName",
               "type": "string"
             },
             {
               "indexed": false,
-              "name": "newUrl",
+              "name": "newName",
               "type": "string"
             }
           ],
-          "name": "LogTokenUrlChange",
+          "name": "LogTokenNameChange",
           "type": "event"
         },
-        "0xe46a8f26cfc48c12e40cf50c1063e5913b2a17da6aa396f9b008b2dfd6f273b5": {
+        "0x53d878a6530e56c9bc96548fa0a8cae4f1d1f49c86b0e934c086b992ebb6998f": {
           "anonymous": false,
           "inputs": [
             {
+              "indexed": true,
+              "name": "token",
+              "type": "address"
+            },
+            {
               "indexed": false,
+              "name": "oldSymbol",
+              "type": "string"
+            },
+            {
+              "indexed": false,
+              "name": "newSymbol",
+              "type": "string"
+            }
+          ],
+          "name": "LogTokenSymbolChange",
+          "type": "event"
+        },
+        "0x5b19f79ac4e8cfa820815502e11615f1a449e28155dc289ec5cac1a11f908694": {
+          "anonymous": false,
+          "inputs": [
+            {
+              "indexed": true,
               "name": "token",
               "type": "address"
             },
             {
               "indexed": false,
               "name": "oldIpfsHash",
-              "type": "bytes32"
+              "type": "bytes"
             },
             {
               "indexed": false,
               "name": "newIpfsHash",
-              "type": "bytes32"
+              "type": "bytes"
             }
           ],
           "name": "LogTokenIpfsHashChange",
           "type": "event"
         },
-        "0xa9fd216856477e73d11c1a9140fa3d425fce2e10a5475a996440b31c2e8f1ea4": {
+        "0xc3168fdc13112e44a031057dbf6c609b33353addb4d8037d24543e22cbfe2acd": {
           "anonymous": false,
           "inputs": [
             {
-              "indexed": false,
+              "indexed": true,
               "name": "token",
               "type": "address"
             },
             {
               "indexed": false,
               "name": "oldSwarmHash",
-              "type": "bytes32"
+              "type": "bytes"
             },
             {
               "indexed": false,
               "name": "newSwarmHash",
-              "type": "bytes32"
+              "type": "bytes"
             }
           ],
           "name": "LogTokenSwarmHashChange",
           "type": "event"
         }
       },
-      "updated_at": 1499462280314,
-      "address": "0x0b1ba0af832d7c05fd64161e0db78e85978e8082"
+      "updated_at": 1502488442000,
+      "address": "0x926a74c5c36adf004c87399e65f75628b0f98d2c"
     }
   },
   "schema_version": "0.0.5",
-  "updated_at": 1499462280314
-}
\ No newline at end of file
+  "updated_at": 1502391794385
+}
diff --git a/src/contract_wrappers/exchange_wrapper.ts b/src/contract_wrappers/exchange_wrapper.ts
index 5d7521e89..a324b8554 100644
--- a/src/contract_wrappers/exchange_wrapper.ts
+++ b/src/contract_wrappers/exchange_wrapper.ts
@@ -669,7 +669,7 @@ export class ExchangeWrapper extends ContractWrapper {
         );
 
         const wouldRoundingErrorOccur = await this._isRoundingErrorAsync(
-            signedOrder.takerTokenAmount, fillTakerAmount, signedOrder.makerTokenAmount,
+            fillTakerAmount, signedOrder.takerTokenAmount, signedOrder.makerTokenAmount,
         );
         if (wouldRoundingErrorOccur) {
             throw new Error(ExchangeContractErrs.OrderFillRoundingError);
@@ -713,7 +713,7 @@ export class ExchangeWrapper extends ContractWrapper {
                                         makerTokenAmount: BigNumber.BigNumber): Promise<boolean> {
         const exchangeInstance = await this._getExchangeContractAsync();
         const isRoundingError = await exchangeInstance.isRoundingError.call(
-            demoninator, numerator, makerTokenAmount,
+            numerator, demoninator, makerTokenAmount,
         );
         return isRoundingError;
     }
diff --git a/src/contract_wrappers/token_registry_wrapper.ts b/src/contract_wrappers/token_registry_wrapper.ts
index d15e5c4f7..eaaea150d 100644
--- a/src/contract_wrappers/token_registry_wrapper.ts
+++ b/src/contract_wrappers/token_registry_wrapper.ts
@@ -30,8 +30,7 @@ export class TokenRegistryWrapper extends ContractWrapper {
                 address: metadata[0],
                 name: metadata[1],
                 symbol: metadata[2],
-                url: metadata[3],
-                decimals: metadata[4].toNumber(),
+                decimals: metadata[3].toNumber(),
             };
         });
         return tokens;
diff --git a/src/schemas/token_schema.ts b/src/schemas/token_schema.ts
index 1236e07c1..e9e359fdf 100644
--- a/src/schemas/token_schema.ts
+++ b/src/schemas/token_schema.ts
@@ -5,18 +5,7 @@ export const tokenSchema = {
         symbol: {type: 'string'},
         decimals: {type: 'number'},
         address: {$ref: '/addressSchema'},
-        url: {
-            oneOf: [
-                {
-                    type: 'string',
-                    format: 'uri',
-                },
-                {
-                    enum: [''],
-                },
-            ],
-        },
     },
-    required: ['name', 'symbol', 'decimals', 'address', 'url'],
+    required: ['name', 'symbol', 'decimals', 'address'],
     type: 'object',
 };
diff --git a/src/types.ts b/src/types.ts
index 851995cf7..81ff30dc5 100644
--- a/src/types.ts
+++ b/src/types.ts
@@ -54,7 +54,7 @@ export interface ExchangeContract extends ContractInstance {
         call: (orderHash: string) => BigNumber.BigNumber;
     };
     isRoundingError: {
-        call: (takerTokenAmount: BigNumber.BigNumber, fillTakerAmount: BigNumber.BigNumber,
+        call: (fillTakerAmount: BigNumber.BigNumber, takerTokenAmount: BigNumber.BigNumber,
                makerTokenAmount: BigNumber.BigNumber, txOpts?: TxOpts) => Promise<boolean>;
     };
     fillOrder: {
@@ -85,10 +85,10 @@ export interface ExchangeContract extends ContractInstance {
                       v: number[], r: string[], s: string[], txOpts?: TxOpts) => number;
     };
     cancelOrder: {
-        (orderAddresses: OrderAddresses, orderValues: OrderValues, canceltakerTokenAmount: BigNumber.BigNumber,
+        (orderAddresses: OrderAddresses, orderValues: OrderValues, cancelTakerTokenAmount: BigNumber.BigNumber,
          txOpts?: TxOpts): ContractResponse;
         estimateGas: (orderAddresses: OrderAddresses, orderValues: OrderValues,
-                      canceltakerTokenAmount: BigNumber.BigNumber,
+                      cancelTakerTokenAmount: BigNumber.BigNumber,
                       txOpts?: TxOpts) => number;
     };
     batchCancelOrders: {
@@ -275,15 +275,14 @@ export interface SignedOrder extends Order {
     ecSignature: ECSignature;
 }
 
-//                          [address, name, symbol, projectUrl, decimals, ipfsHash, swarmHash]
-export type TokenMetadata = [string, string, string, string, BigNumber.BigNumber, string, string];
+//                          [address, name, symbol, decimals, ipfsHash, swarmHash]
+export type TokenMetadata = [string, string, string, BigNumber.BigNumber, string, string];
 
 export interface Token {
     name: string;
     address: string;
     symbol: string;
     decimals: number;
-    url: string;
 }
 
 export interface TxOpts {