diff --git a/README.md b/README.md
index 48bde4c..1034854 100644
--- a/README.md
+++ b/README.md
@@ -39,9 +39,11 @@ Integrates [apollo](http://www.apollostack.com/) in your [Vue](http://vuejs.org)
   - [Skipping the subscription](#skipping-the-subscription)
   - [Manually adding a smart Subscription](#manually-adding-a-smart-subscription)
 - [Pagination with `fetchMore`](#pagination-with-fetchmore)
+- [Special options](#special-options)
 - [Skip all](#skip-all)
 - [Multiple clients](#multiple-clients)
 - [Server-Side Rendering](#server-side-rendering)
+- [API Reference](#api-reference)
 
 ## Installation
 
@@ -1040,6 +1042,48 @@ export default {
 
 **Don't forget to include the `__typename` to the new result.**
 
+## Special options
+
+The special options being with `$` in the `apollo` object.
+
+- `$skip` to disable all queries and subscriptions (see below)
+- `$skipAllQueries` to disable all queries (see below)
+- `$skipAllSubscriptions` to disable all subscriptions (see below)
+- `$client` to use a client by default (see below)
+- `$loadingKey` for a default loading key (see `loadingKey` advanced options for smart queries)
+- `$error` to catch errors in a default handler (see `error` advanced options for smart queries)
+
+Example:
+
+```html
+<script>
+export default {
+  data () {
+    return {
+      loading: 0,
+    }
+  },
+  apollo: {
+    $loadingKey: 'loading',
+    query1: { ... },
+    query2: { ... },
+  },
+}
+</script>
+```
+
+You can define in the apollo provider a default set of options to apply to the `apollo` definitions. For example:
+
+```javascript
+const apolloProvider = new VueApollo({
+  defaultClient: apolloClient,
+  defaultOptions: {
+    // apollo options applied to all components that are using apollo
+    $loadingKey: 'loading',
+  },
+})
+```
+
 ## Skip all
 
 You can disable all the queries for the component with `skipAllQueries`, all the subscriptions with `skipAllSubscriptions` and both with `skipAll`:
@@ -1409,4 +1453,125 @@ router.onReady(() => {
 
 ---
 
+# API Reference
+
+WIP (PR welcome!)
+
+## ApolloProvider
+
+### Constructor
+
+```javascript
+const apolloProvider = new VueApollo({
+  // Multiple clients support
+  // Use the 'client' option inside queries
+  // or '$client' on the apollo definition
+  clients: {
+    a: apolloClientA,
+    b: apolloClientB,
+  },
+  // Default client
+  defaultClient: apolloClient,
+  // Default 'apollo' definition
+  defaultOptions: {
+    // See 'apollo' defintion
+  },
+  // Watch loading state for all queries
+  // See the 'watchLoading' advanced option
+  watchLoading (state, mod) {
+    loading += mod
+    console.log('Global loading', loading, mod)
+  },
+  // Global error handler for all smart queries and subscriptions
+  errorHandler (error) {
+    console.log('Global error handler')
+    console.error(error)
+  },
+})
+```
+
+Use the apollo provider into your Vue app:
+
+```javascript
+new Vue({
+  el: '#app',
+  apolloProvider,
+  render: h => h(App),
+})
+```
+
+### Methods
+
+#### prefetchAll
+
+(SSR) Prefetch all queued component definitions and returns a promise resolved when all corresponding apollo data is ready.
+
+```javascript
+await apolloProvider.prefetchAll (context, componentDefs, options)
+```
+
+`context` is passed as the argument to the `prefetch` options inside the smart queries. It may contain the route and the store.
+
+`options` defaults to:
+
+```javascript
+{
+  // Include components outside of the routes
+  // that are registered with `willPrefetch`
+  includeGlobal: true,
+}
+```
+
+#### getStates
+
+(SSR) Returns the apollo stores states as JavaScript objects.
+
+```JavaScript
+const states = apolloProvider.getStates(options)
+```
+
+`options` defaults to:
+
+```javascript
+{
+  // Prefix for the keys of each apollo client state
+  exportNamespace: '',
+}
+```
+
+#### exportStates
+
+(SSR) Returns the apollo stores states as JavaScript code inside a String. This code can be directly injected to the page HTML inside a `<script>` tag.
+
+```javascript
+const js = apolloProvider.exportStates(options)
+```
+
+`options` defaults to:
+
+```javascript
+{
+  // Global variable name
+  globalName: '__APOLLO_STATE__',
+  // Global object on which the variable is set
+  attachTo: 'window',
+  // Prefix for the keys of each apollo client state
+  exportNamespace: '',
+}
+```
+
+## Dollar Apollo
+
+This is the apollo manager added to any component that uses apollo. It can be accessed inside a component with `this.$apollo`.
+
+## Smart Query
+
+Each query declared in the `apollo` definition (that is, which doesn't start with a `$` char) in a component results in the creation of a smart query object.
+
+## Smart Subscription
+
+Each subscription declared in the `apollo.$subscribe` option in a component results in the creation of a smart subscription object.
+
+---
+
 LICENCE ISC - Created by Guillaume CHAU (@Akryum)
diff --git a/src/apollo-provider.js b/src/apollo-provider.js
index ef3ae78..12db134 100644
--- a/src/apollo-provider.js
+++ b/src/apollo-provider.js
@@ -9,6 +9,9 @@ export class ApolloProvider {
     }
     this.clients = options.clients || {}
     this.clients.defaultClient = this.defaultClient = options.defaultClient
+    this.defaultOptions = options.defaultOptions
+    this.watchLoading = options.watchLoading
+    this.errorHandler = options.errorHandler
 
     this.prefetchQueries = []
   }
diff --git a/src/dollar-apollo.js b/src/dollar-apollo.js
index 3a70d7e..3921fa1 100644
--- a/src/dollar-apollo.js
+++ b/src/dollar-apollo.js
@@ -10,6 +10,8 @@ export class DollarApollo {
     this.queries = {}
     this.subscriptions = {}
     this.client = undefined
+    this.loadingKey = undefined
+    this.error = undefined
   }
 
   get provider () {
diff --git a/src/index.js b/src/index.js
index dc1f618..e9f7c4f 100644
--- a/src/index.js
+++ b/src/index.js
@@ -8,8 +8,11 @@ const keywords = [
 ]
 
 const prepare = function prepare () {
+  let apolloProvider
   if (this.$options.apolloProvider) {
-    this._apolloProvider = this.$options.apolloProvider
+    apolloProvider = this._apolloProvider = this.$options.apolloProvider
+  } else {
+    apolloProvider = this.$root._apolloProvider
   }
 
   if (this._apolloPrepared) return
@@ -17,9 +20,20 @@ const prepare = function prepare () {
 
   // Prepare properties
   let apollo = this.$options.apollo
+
   if (apollo) {
     this._apolloQueries = {}
     this._apolloInitData = {}
+    this.$apollo = new DollarApollo(this)
+
+    if (!apollo.$init) {
+      apollo.$init = true
+
+      // Default options applied to `apollo` options
+      if (apolloProvider.defaultOptions) {
+        apollo = this.$options.apollo = Object.assign({}, apolloProvider.defaultOptions, apollo)
+      }
+    }
 
     // watchQuery
     for (let key in apollo) {
@@ -35,6 +49,16 @@ const launch = function launch () {
   if (this._apolloLaunched) return
   this._apolloLaunched = true
 
+  let apollo = this.$options.apollo
+  if (apollo) {
+    defineReactiveSetter(this.$apollo, 'skipAll', apollo.$skipAll)
+    defineReactiveSetter(this.$apollo, 'skipAllQueries', apollo.$skipAllQueries)
+    defineReactiveSetter(this.$apollo, 'skipAllSubscriptions', apollo.$skipAllSubscriptions)
+    defineReactiveSetter(this.$apollo, 'client', apollo.$client)
+    defineReactiveSetter(this.$apollo, 'loadingKey', apollo.$loadingKey)
+    defineReactiveSetter(this.$apollo, 'error', apollo.$error)
+  }
+
   if (this._apolloQueries) {
     // watchQuery
     for (let key in this._apolloQueries) {
@@ -42,7 +66,6 @@ const launch = function launch () {
     }
   }
 
-  let apollo = this.$options.apollo
   if (apollo) {
     if (apollo.subscribe) {
       Globals.Vue.util.warn('vue-apollo -> `subscribe` option is deprecated. Use the `$subscribe` option instead.')
@@ -53,11 +76,6 @@ const launch = function launch () {
         this.$apollo.addSmartSubscription(key, apollo.$subscribe[key])
       }
     }
-
-    defineReactiveSetter(this.$apollo, 'skipAll', apollo.$skipAll)
-    defineReactiveSetter(this.$apollo, 'skipAllQueries', apollo.$skipAllQueries)
-    defineReactiveSetter(this.$apollo, 'skipAllSubscriptions', apollo.$skipAllSubscriptions)
-    defineReactiveSetter(this.$apollo, 'client', apollo.$client)
   }
 }
 
@@ -95,16 +113,6 @@ export function install (Vue, options) {
     return Object.assign(map, merge(toData, fromData))
   }
 
-  // Lazy creation
-  Object.defineProperty(Vue.prototype, '$apollo', {
-    get () {
-      if (!this._apollo) {
-        this._apollo = new DollarApollo(this)
-      }
-      return this._apollo
-    },
-  })
-
   Vue.mixin({
 
     // Vue 1.x
diff --git a/src/smart-apollo.js b/src/smart-apollo.js
index 88c9028..b579dd8 100644
--- a/src/smart-apollo.js
+++ b/src/smart-apollo.js
@@ -115,6 +115,12 @@ class SmartApollo {
     throw new Error('Not implemented')
   }
 
+  errorHandler (...args) {
+    this.options.error && this.options.error.call(this.vm, ...args)
+    this.vm.$apollo.error && this.vm.$apollo.error.call(this.vm, ...args)
+    this.vm.$apollo.provider.errorHandler && this.vm.$apollo.provider.errorHandler.call(this.vm, ...args)
+  }
+
   catchError (error) {
     if (error.graphQLErrors && error.graphQLErrors.length !== 0) {
       console.error(`GraphQL execution errors for ${this.type} '${this.key}'`)
@@ -132,9 +138,7 @@ class SmartApollo {
       }
     }
 
-    if (typeof this.options.error === 'function') {
-      this.options.error.call(this.vm, error)
-    }
+    this.errorHandler(error)
   }
 
   destroy () {
@@ -233,14 +237,23 @@ export class SmartQuery extends SmartApollo {
     this.loadingDone()
   }
 
+  get loadingKey () {
+    return this.options.loadingKey || this.vm.$apollo.loadingKey
+  }
+
+  watchLoading (...args) {
+    this.options.watchLoading && this.options.watchLoading.call(this.vm, ...args)
+    this.vm.$apollo.watchLoading && this.vm.$apollo.watchLoading.call(this.vm, ...args)
+    this.vm.$apollo.provider.watchLoading && this.vm.$apollo.provider.watchLoading.call(this.vm, ...args)
+  }
+
   applyLoadingModifier (value) {
-    if (this.options.loadingKey) {
-      this.vm[this.options.loadingKey] += value
+    const loadingKey = this.loadingKey
+    if (loadingKey && typeof this.vm[loadingKey] === 'number') {
+      this.vm[loadingKey] += value
     }
 
-    if (this.options.watchLoading) {
-      this.options.watchLoading.call(this.vm, value === 1, value)
-    }
+    this.watchLoading(value === 1, value)
   }
 
   loadingDone () {