diff --git a/src/Internal/Values/Vault.elm b/src/Internal/Values/Vault.elm
index 01b7ad1..aaed701 100644
--- a/src/Internal/Values/Vault.elm
+++ b/src/Internal/Values/Vault.elm
@@ -6,11 +6,13 @@ It handles all communication with the homeserver.
 
 import Internal.Tools.Hashdict as Hashdict exposing (Hashdict)
 import Internal.Values.Room as Room exposing (IRoom)
+import Internal.Values.RoomInvite as Invite exposing (IRoomInvite)
 
 
 type IVault
     = IVault
-        { rooms : Hashdict IRoom
+        { invites : List IRoomInvite
+        , rooms : Hashdict IRoom
         , since : Maybe String
         }
 
@@ -22,6 +24,20 @@ addSince since (IVault data) =
     IVault { data | since = Just since }
 
 
+{-| Add a new invite.
+-}
+addInvite : IRoomInvite -> IVault -> IVault
+addInvite invite (IVault data) =
+    IVault { data | invites = List.append data.invites [ invite ] }
+
+
+{-| Get all the invited rooms of a user.
+-}
+getInvites : IVault -> List IRoomInvite
+getInvites (IVault data) =
+    data.invites
+
+
 {-| Get a room from the Credentials type by the room's id.
 -}
 getRoomById : String -> IVault -> Maybe IRoom
@@ -48,7 +64,8 @@ getSince (IVault { since }) =
 init : IVault
 init =
     IVault
-        { rooms = Hashdict.empty Room.roomId
+        { invites = []
+        , rooms = Hashdict.empty Room.roomId
         , since = Nothing
         }
 
@@ -59,6 +76,13 @@ This function can hence also be used as an update function for rooms.
 
 -}
 insertRoom : IRoom -> IVault -> IVault
-insertRoom room (IVault cred) =
+insertRoom room (IVault data) =
     IVault
-        { cred | rooms = Hashdict.insert room cred.rooms }
+        { data | rooms = Hashdict.insert room data.rooms }
+
+
+{-| Remove an invite. This is usually done when the invite has been accepted or rejected.
+-}
+removeInvite : String -> IVault -> IVault
+removeInvite roomId (IVault data) =
+    IVault { data | invites = List.filter (\i -> Invite.roomId i /= roomId) data.invites }
diff --git a/src/Matrix.elm b/src/Matrix.elm
new file mode 100644
index 0000000..24497df
--- /dev/null
+++ b/src/Matrix.elm
@@ -0,0 +1,118 @@
+module Matrix exposing (..)
+
+{-| This is the main module of the SDK. Here, you will find basic functions to
+interact with the API.
+
+
+# Create a new Vault
+
+@docs Vault, fromLoginCredentials, fromAccessToken
+
+
+# Keeping your Vault up-to-date
+
+@docs sync, VaultUpdate, updateWith
+
+
+# Exploring your vault
+
+@docs getRooms, getRoomById, accessToken
+
+-}
+
+import Internal.Api.VaultUpdate as Api
+import Internal.Invite exposing (RoomInvite)
+import Internal.Room exposing (Room)
+import Internal.Tools.Exceptions as X
+import Internal.Vault
+import Task exposing (Task)
+
+
+{-| The Matrix API requires you to keep track of a lot of tokens, keys, values and more.
+Luckily, you don't need to!
+
+You can view the `Vault` as a large box of keys that will help you get
+the information that you need. The type also caches information that it receives
+from the API, so you can also ask it for information that it has seen before.
+
+-}
+type alias Vault =
+    Internal.Vault.Vault
+
+
+{-| The `VaultUpdate` is a type that helps you keep your `Vault` type up-to-date.
+Sometimes, the API will tell you to change certain tokens, and this SDK will
+translate those instructions to a `VaultUpdate` that you can feed to your `Vault`.
+-}
+type alias VaultUpdate =
+    Api.VaultUpdate
+
+
+{-| Create a new vault based on an access token.
+Keep in mind that access tokens might eventually be revoked or expire,
+so it is better to use login credentials if you're planning to use a Vault long-term.
+-}
+fromAccessToken : { accessToken : String, baseUrl : String } -> Vault
+fromAccessToken =
+    Internal.Vault.fromAccessToken
+
+
+{-| Based on a user's username and password, you can create a vault that will automatically
+log in if an access token ever happens to run out, expire or lose contact in any other way.
+-}
+fromLoginCredentials : { baseUrl : String, username : String, password : String } -> Vault
+fromLoginCredentials =
+    Internal.Vault.fromLoginVault
+
+
+{-| Whenever you're asking the Matrix API for information that your Vault doesn't have,
+you will receive a `VaultUpdate` type. This will reorganise your Vault with the newly
+gained information.
+
+After having updated your vault, it (usually) has all the information you need.
+
+-}
+updateWith : VaultUpdate -> Vault -> Vault
+updateWith =
+    Internal.Vault.updateWith
+
+
+{-| The Matrix API is always looking for new ways to optimize synchronising events to your client.
+Luckily, you don't need to worry about keeping up a connection!
+
+Your vault is always a snapshot of changes since the last time you updated it.
+If you'd like to update it once more, simply run this function and the API will make sure that your Vault has the latest changes.
+
+-}
+sync : Vault -> Task X.Error VaultUpdate
+sync =
+    Internal.Vault.sync
+
+
+{-| Get all the rooms your user has joined, according to your vault.
+-}
+getRooms : Vault -> List Room
+getRooms =
+    Internal.Vault.rooms
+
+
+{-| Get a Matrix room by its id.
+This will only return the room if you have joined the room.
+-}
+getRoomById : String -> Vault -> Maybe Room
+getRoomById =
+    Internal.Vault.getRoomById
+
+
+{-| Get all invites that the user is invited to.
+-}
+getInvites : Vault -> List RoomInvite
+getInvites =
+    Internal.Vault.getInvites
+
+
+{-| Join a Matrix room based on its room id.
+-}
+joinRoomById : String -> Vault -> Task X.Error VaultUpdate
+joinRoomById =
+    Internal.Vault.joinRoomById
diff --git a/src/Matrix/RoomInvite.elm b/src/Matrix/RoomInvite.elm
new file mode 100644
index 0000000..50bffbe
--- /dev/null
+++ b/src/Matrix/RoomInvite.elm
@@ -0,0 +1,124 @@
+module Matrix.RoomInvite exposing (..)
+
+{-| Sometimes, your user will be invited to a new room!
+This module offers you a few simple handles to deal with such invites -
+you can accept them, reject them or inspect them for further information.
+
+
+# Invitations
+
+@docs RoomInvite, accept, reject, acceptWithReason, rejectWithReason
+
+
+# Exploring invitations
+
+Sometimes, you may want to display information about the room.
+
+Be careful though, anyone can invite you to any room! This means that room invites
+may contain offensive, shocking or other unwanted content that the user may not
+want to see.
+
+-}
+
+import Internal.Api.VaultUpdate exposing (VaultUpdate)
+import Internal.Invite as Internal
+import Internal.Room exposing (Room)
+import Internal.Tools.Exceptions as X
+import Internal.Values.RoomInvite as IR
+import Json.Encode as E
+import Task exposing (Task)
+
+
+{-| The `RoomInvite` type serves as an invite to a given room.
+-}
+type alias RoomInvite =
+    Internal.RoomInvite
+
+
+{-| If you would like to join a room, you can accept the offer.
+-}
+accept : RoomInvite -> Task X.Error VaultUpdate
+accept invite =
+    Internal.accept { invite = invite, reason = Nothing }
+
+
+{-| If you don't want to join the room, you can reject the offer.
+-}
+reject : RoomInvite -> Task X.Error VaultUpdate
+reject invite =
+    Internal.reject { invite = invite, reason = Nothing }
+
+
+{-| If the Matrix server supports it, you can add a reason for accepting an invite.
+-}
+acceptWithReason : String -> RoomInvite -> Task X.Error VaultUpdate
+acceptWithReason reason invite =
+    Internal.accept { invite = invite, reason = Just reason }
+
+
+{-| If the Matrix server supports it, you can add a reason for rejecting an invite.
+-}
+rejectWithReason : String -> RoomInvite -> Task X.Error VaultUpdate
+rejectWithReason reason invite =
+    Internal.reject { invite = invite, reason = Just reason }
+
+
+{-| Get the room id of the invited room.
+-}
+roomId : RoomInvite -> String
+roomId =
+    Internal.getRoomId
+
+
+{-| The `RoomInviteEvent` type represents a stripped event that your user can see while they haven't joined the group yet.
+
+The invite includes a bunch of these events to tell you what the room looks like, who may be part of it,
+and other information that will give you a hint of what kind of room it is.
+
+-}
+type alias RoomInviteEvent =
+    IR.RoomInviteEvent
+
+
+{-| Get the Matrix user that originally sent this event.
+-}
+sender : RoomInviteEvent -> String
+sender =
+    IR.sender
+
+
+{-| Get the content of the event.
+-}
+content : RoomInviteEvent -> E.Value
+content =
+    IR.content
+
+
+{-| Get the event's content type.
+-}
+contentType : RoomInviteEvent -> String
+contentType =
+    IR.contentType
+
+
+{-| Get the event's state key.
+-}
+stateKey : RoomInviteEvent -> String
+stateKey =
+    IR.stateKey
+
+
+{-| Get a specific event with a specific event content type and state key, if it exists.
+-}
+getEvent : { contentType : String, stateKey : String } -> RoomInvite -> Maybe RoomInviteEvent
+getEvent data invite =
+    invite
+        |> Internal.withoutCredentials
+        |> IR.getEvent data
+
+
+{-| Instead of looking at just one event, get all events in a list.
+-}
+getAllEvents : RoomInvite -> List RoomInviteEvent
+getAllEvents =
+    Internal.getAllEvents