diff --git a/README.md b/README.md
index 63a3ccfe..d8c4f05c 100644
--- a/README.md
+++ b/README.md
@@ -75,7 +75,7 @@ const client = new smartcar.AuthClient({
 // Redirect to Smartcar's authentication flow
 app.get('/login', function(req, res) {
 
-  const link = client.getAuthUrl({state: 'MY_STATE_PARAM'});
+  const link = client.getAuthUrl();
 
   // redirect to the link
   res.redirect(link);
diff --git a/doc/readme.md b/doc/readme.md
index c68c5101..377a18be 100644
--- a/doc/readme.md
+++ b/doc/readme.md
@@ -303,6 +303,7 @@ Error thrown when gateway to Smartcar times out
     * [.getAuthUrl([options])](#AuthClient+getAuthUrl) ⇒ <code>String</code>
     * [.exchangeCode(code)](#AuthClient+exchangeCode) ⇒ [<code>Promise.&lt;Access&gt;</code>](#Access)
     * [.exchangeRefreshToken(token)](#AuthClient+exchangeRefreshToken) ⇒ [<code>Promise.&lt;Access&gt;</code>](#Access)
+    * [.compatibility(vin)](#AuthClient+compatibility) ⇒ <code>Promise.&lt;Boolean&gt;</code>
 
 <a name="new_AuthClient_new"></a>
 
@@ -372,6 +373,19 @@ Exchange a refresh token for a new access object.
 | --- | --- | --- |
 | token | <code>String</code> | Refresh token to exchange for a new set of Access and Refresh tokens. |
 
+<a name="AuthClient+compatibility"></a>
+
+### authClient.compatibility(vin) ⇒ <code>Promise.&lt;Boolean&gt;</code>
+Determine whether a vehicle is compatible with Smartcar
+
+**Kind**: instance method of [<code>AuthClient</code>](#AuthClient)
+**Returns**: <code>Promise.&lt;Boolean&gt;</code> - true if the vehicle is compatible
+with Smartcar
+
+| Param | Type | Description |
+| --- | --- | --- |
+| vin | <code>String</code> | the VIN of the vehicle |
+
 <a name="Vehicle"></a>
 
 ## Vehicle
diff --git a/lib/auth-client.js b/lib/auth-client.js
index 2293548b..6231ea07 100644
--- a/lib/auth-client.js
+++ b/lib/auth-client.js
@@ -202,4 +202,25 @@ AuthClient.prototype.exchangeRefreshToken = function(token) {
 
 };
 
+/**
+ * Determine whether a vehicle is compatible with Smartcar
+ *
+ * @param {String} vin - the VIN of the vehicle
+ * @return {Promise.<Boolean>} true if the vehicle is compatible
+ * with Smartcar
+ */
+AuthClient.prototype.compatibility = function(vin) {
+
+  const qs = {vin};
+
+  return util.wrap(this.request.get({
+    baseUrl: config.api,
+    url: `v${config.version}/compatibility`,
+    qs,
+  }))
+    .then(function(response) {
+      return response.compatible;
+    });
+};
+
 module.exports = AuthClient;
diff --git a/test/end-to-end/auth-client.js b/test/end-to-end/auth-client.js
index 1554c65f..38e82a7c 100644
--- a/test/end-to-end/auth-client.js
+++ b/test/end-to-end/auth-client.js
@@ -52,3 +52,16 @@ test('exchangeRefreshToken', async(t) => {
     'refreshToken',
   ]), []);
 });
+
+test('compatibility', async(t) => {
+  const client = new smartcar.AuthClient(getAuthClientParams());
+
+  const teslaVin = '5YJXCDE22HF068739';
+  const royceVin = 'SCA665C59HUX86700';
+
+  const teslaComp = await client.compatibility(teslaVin);
+  const royceComp = await client.compatibility(royceVin);
+
+  t.truthy(teslaComp);
+  t.falsy(royceComp);
+});
diff --git a/test/unit/lib/auth-client.js b/test/unit/lib/auth-client.js
index 466bfc27..4e37b8b9 100644
--- a/test/unit/lib/auth-client.js
+++ b/test/unit/lib/auth-client.js
@@ -342,3 +342,29 @@ test('exchangeRefreshToken', async function(t) {
   t.true(n.isDone());
 
 });
+
+test('compatibility', async function(t) {
+  const client = new AuthClient({
+    clientId: CLIENT_ID,
+    clientSecret: CLIENT_SECRET,
+    redirectUri: 'https://insurance.co/callback',
+  });
+
+  const vin = 'fake_vin';
+
+  const n = nock('https://api.smartcar.com')
+    .get('/v1.0/compatibility')
+    .query({vin})
+    .basicAuth({
+      user: CLIENT_ID,
+      pass: CLIENT_SECRET,
+    })
+    .reply(200, {
+      compatible: true,
+    });
+
+  const response = await client.compatibility(vin);
+
+  t.is(response, true);
+  t.true(n.isDone());
+});