diff --git a/package-lock.json b/package-lock.json
index ae238d7..a55053a 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1314,6 +1314,7 @@
       "requires": {
         "anymatch": "1.3.2",
         "async-each": "1.0.1",
+        "fsevents": "1.1.3",
         "glob-parent": "2.0.0",
         "inherits": "2.0.3",
         "is-binary-path": "1.0.1",
@@ -2258,6 +2259,910 @@
       "integrity": "sha1-FQStJSMVjKpA20onh8sBQRmU6k8=",
       "dev": true
     },
+    "fsevents": {
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+      "resolved": "https://registry.npmjs.org/fsevents/-/fsevents-1.1.3.tgz",
+      "integrity": "sha512-WIr7iDkdmdbxu/Gh6eKEZJL6KPE74/5MEsf2whTOFNxbIoIixogroLdKYqB6FDav4Wavh/lZdzzd3b2KxIXC5Q==",
+      "dev": true,
+      "optional": true,
+      "requires": {
+        "nan": "2.8.0",
+        "node-pre-gyp": "0.6.39"
+      },
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+            "json-stable-stringify": "1.0.1"
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+          }
+        },
+        "string-width": {
+          "version": "1.0.2",
+          "bundled": true,
+          "dev": true,
+          "requires": {
+            "code-point-at": "1.1.0",
+            "is-fullwidth-code-point": "1.0.0",
+            "strip-ansi": "3.0.1"
+          }
+        },
+        "string_decoder": {
+          "version": "1.0.1",
+          "bundled": true,
+          "dev": true,
+          "requires": {
+            "safe-buffer": "5.0.1"
+          }
+        },
+        "stringstream": {
+          "version": "0.0.5",
+          "bundled": true,
+          "dev": true,
+          "optional": true
+        },
+        "strip-ansi": {
+          "version": "3.0.1",
+          "bundled": true,
+          "dev": true,
+          "requires": {
+            "ansi-regex": "2.1.1"
+          }
+        },
+        "strip-json-comments": {
+          "version": "2.0.1",
+          "bundled": true,
+          "dev": true,
+          "optional": true
+        },
+        "tar": {
+          "version": "2.2.1",
+          "bundled": true,
+          "dev": true,
+          "requires": {
+            "block-stream": "0.0.9",
+            "fstream": "1.0.11",
+            "inherits": "2.0.3"
+          }
+        },
+        "tar-pack": {
+          "version": "3.4.0",
+          "bundled": true,
+          "dev": true,
+          "optional": true,
+          "requires": {
+            "debug": "2.6.8",
+            "fstream": "1.0.11",
+            "fstream-ignore": "1.0.5",
+            "once": "1.4.0",
+            "readable-stream": "2.2.9",
+            "rimraf": "2.6.1",
+            "tar": "2.2.1",
+            "uid-number": "0.0.6"
+          }
+        },
+        "tough-cookie": {
+          "version": "2.3.2",
+          "bundled": true,
+          "dev": true,
+          "optional": true,
+          "requires": {
+            "punycode": "1.4.1"
+          }
+        },
+        "tunnel-agent": {
+          "version": "0.6.0",
+          "bundled": true,
+          "dev": true,
+          "optional": true,
+          "requires": {
+            "safe-buffer": "5.0.1"
+          }
+        },
+        "tweetnacl": {
+          "version": "0.14.5",
+          "bundled": true,
+          "dev": true,
+          "optional": true
+        },
+        "uid-number": {
+          "version": "0.0.6",
+          "bundled": true,
+          "dev": true,
+          "optional": true
+        },
+        "util-deprecate": {
+          "version": "1.0.2",
+          "bundled": true,
+          "dev": true
+        },
+        "uuid": {
+          "version": "3.0.1",
+          "bundled": true,
+          "dev": true,
+          "optional": true
+        },
+        "verror": {
+          "version": "1.3.6",
+          "bundled": true,
+          "dev": true,
+          "optional": true,
+          "requires": {
+            "extsprintf": "1.0.2"
+          }
+        },
+        "wide-align": {
+          "version": "1.1.2",
+          "bundled": true,
+          "dev": true,
+          "optional": true,
+          "requires": {
+            "string-width": "1.0.2"
+          }
+        },
+        "wrappy": {
+          "version": "1.0.2",
+          "bundled": true,
+          "dev": true
+        }
+      }
+    },
     "function-bind": {
       "version": "1.1.1",
       "resolved": "https://registry.npmjs.org/function-bind/-/function-bind-1.1.1.tgz",
@@ -3423,6 +4328,13 @@
       "integrity": "sha1-MHXOk7whuPq0PhvE2n6BFe0ee6s=",
       "dev": true
     },
+    "nan": {
+      "version": "2.8.0",
+      "resolved": "https://registry.npmjs.org/nan/-/nan-2.8.0.tgz",
+      "integrity": "sha1-7XFfP+neArV6XmJS2QqWZ14fCFo=",
+      "dev": true,
+      "optional": true
+    },
     "native-promise-only": {
       "version": "0.8.1",
       "resolved": "https://registry.npmjs.org/native-promise-only/-/native-promise-only-0.8.1.tgz",
diff --git a/src/subscriptions/eth.js b/src/subscriptions/eth.js
index daef2fe..de717ba 100644
--- a/src/subscriptions/eth.js
+++ b/src/subscriptions/eth.js
@@ -26,7 +26,7 @@ class Eth {
     this._pollTimerId = null;
     this._pollBlockNumber = this._pollBlockNumber.bind(this);
 
-    this._api.transport.on('close', () => {
+    this._api.provider.on('close', () => {
       if (this.isStarted) {
         this.start();
       }
@@ -70,7 +70,7 @@ class Eth {
       }
     };
 
-    if (!this._api.transport.isConnected) {
+    if (!this._api.provider.isConnected) {
       nextTimeout(500, true);
       return;
     }
diff --git a/src/subscriptions/eth.spec.js b/src/subscriptions/eth.spec.js
index 2d506c0..598d91e 100644
--- a/src/subscriptions/eth.spec.js
+++ b/src/subscriptions/eth.spec.js
@@ -30,7 +30,7 @@ function stubApi (blockNumber) {
 
   return {
     _calls,
-    transport: {
+    provider: {
       isConnected: true,
       on: () => {}
     },
diff --git a/src/subscriptions/manager.spec.js b/src/subscriptions/manager.spec.js
index 5b1527a..a3d100c 100644
--- a/src/subscriptions/manager.spec.js
+++ b/src/subscriptions/manager.spec.js
@@ -26,7 +26,7 @@ function newStub () {
   const start = () => manager._updateSubscriptions(manager.__test, null, 'test');
 
   const manager = new Manager({
-    transport: {
+    provider: {
       isConnected: true,
       on: sinon.stub()
     }
diff --git a/src/subscriptions/personal.js b/src/subscriptions/personal.js
index a473319..4a52174 100644
--- a/src/subscriptions/personal.js
+++ b/src/subscriptions/personal.js
@@ -28,7 +28,7 @@ class Personal {
     this._defaultAccount = this._defaultAccount.bind(this);
     this._listAccounts = this._listAccounts.bind(this);
 
-    this._api.transport.on('close', () => {
+    this._api.provider.on('close', () => {
       if (this.isStarted) {
         this.start();
       }
@@ -85,7 +85,7 @@ class Personal {
       }
     };
 
-    if (!this._api.transport.isConnected) {
+    if (!this._api.isConnected) {
       nextTimeout(500);
       return;
     }
diff --git a/src/subscriptions/personal.spec.js b/src/subscriptions/personal.spec.js
index 5e44399..5f23f2a 100644
--- a/src/subscriptions/personal.spec.js
+++ b/src/subscriptions/personal.spec.js
@@ -38,7 +38,8 @@ function stubApi (accounts, info) {
 
   return {
     _calls,
-    transport: {
+    isConnected: true,
+    provider: {
       isConnected: true,
       on: sinon.stub()
     },
diff --git a/src/subscriptions/signer.js b/src/subscriptions/signer.js
index aa43dba..ed0b89e 100644
--- a/src/subscriptions/signer.js
+++ b/src/subscriptions/signer.js
@@ -25,7 +25,7 @@ class Signer {
 
     this._listRequests = this._listRequests.bind(this);
 
-    this._api.transport.on('close', () => {
+    this._api.provider.on('close', () => {
       if (this.isStarted) {
         this.start();
       }
@@ -74,7 +74,7 @@ class Signer {
       }
     };
 
-    if (!this._api.transport.isConnected) {
+    if (!this._api.isConnected) {
       nextTimeout(500, true);
       return;
     }
diff --git a/src/util/wei.js b/src/util/wei.js
index 632e8d2..319c216 100644
--- a/src/util/wei.js
+++ b/src/util/wei.js
@@ -25,7 +25,7 @@ function _getUnitMultiplier (unit) {
     throw new Error(`Unknown unit ${unit} passed to wei formatter`);
   }
 
-  return 10 ** (position * 3);
+  return Math.pow(10, position * 3);
 }
 
 function fromWei (value, unit = 'ether') {
diff --git a/src/util/wei.spec.js b/src/util/wei.spec.js
index 287072e..1b27635 100644
--- a/src/util/wei.spec.js
+++ b/src/util/wei.spec.js
@@ -19,15 +19,15 @@ const { _getUnitMultiplier, fromWei, toWei } = require('./wei');
 describe('util/wei', () => {
   describe('_getUnitMultiplier', () => {
     it('returns 10^0 for wei', () => {
-      expect(_getUnitMultiplier('wei')).to.equal(10 ** 0);
+      expect(_getUnitMultiplier('wei')).to.equal(Math.pow(10, 0));
     });
 
     it('returns 10^15 for finney', () => {
-      expect(_getUnitMultiplier('finney')).to.equal(10 ** 15);
+      expect(_getUnitMultiplier('finney')).to.equal(Math.pow(10, 15));
     });
 
     it('returns 10^18 for ether', () => {
-      expect(_getUnitMultiplier('ether')).to.equal(10 ** 18);
+      expect(_getUnitMultiplier('ether')).to.equal(Math.pow(10, 18));
     });
 
     it('throws an error on invalid units', () => {