diff --git a/src/MTXClient.h b/src/MTXClient.h
index 476d73f..7b5dde7 100644
--- a/src/MTXClient.h
+++ b/src/MTXClient.h
@@ -142,6 +142,14 @@ typedef void (^mtx_client_room_join_block_t)(OFString *_Nullable roomID,
 		       storage: (id <MTXStorage>)storage
     OF_DESIGNATED_INITIALIZER;
 
+/**
+ * @brief Performs a sync.
+ *
+ * @param block A block to call when a sync was performed
+ */
+- (void)syncWithTimeout: (of_time_interval_t)timeout
+		  block: (mtx_client_response_block_t)block;
+
 /**
  * @brief Logs out the device and invalidates the access token.
  *
diff --git a/src/MTXClient.m b/src/MTXClient.m
index d62ffd9..08907d5 100644
--- a/src/MTXClient.m
+++ b/src/MTXClient.m
@@ -29,6 +29,7 @@
 #import "MTXLoginFailedException.h"
 #import "MTXLogoutFailedException.h"
 #import "MTXSendMessageFailedException.h"
+#import "MTXSyncFailedException.h"
 
 static void
 validateHomeserver(OFURL *homeserver)
@@ -195,6 +196,35 @@ validateHomeserver(OFURL *homeserver)
 				homeserver: _homeserver];
 }
 
+- (void)syncWithTimeout: (of_time_interval_t)timeout
+		  block: (mtx_client_response_block_t)block
+{
+	void *pool = objc_autoreleasePoolPush();
+	MTXRequest *request = [self
+	    requestWithPath: @"/_matrix/client/r0/sync"];
+	unsigned long long timeoutMs = timeout * 1000;
+	request.query = [OFString stringWithFormat: @"timeout=%llu", timeoutMs];
+	[request performWithBlock: ^ (mtx_response_t response, int statusCode,
+				       id exception) {
+		if (exception != nil) {
+			block(exception);
+			return;
+		}
+
+		if (statusCode != 200) {
+			block([MTXSyncFailedException
+			    exceptionWithStatusCode: statusCode
+					   response: response
+					     client: self]);
+			return;
+		}
+
+		block(nil);
+	}];
+
+	objc_autoreleasePoolPop(pool);
+}
+
 - (void)logOutWithBlock: (mtx_client_response_block_t)block
 {
 	void *pool = objc_autoreleasePoolPush();
diff --git a/src/MTXRequest.h b/src/MTXRequest.h
index 303f516..5bf3c93 100644
--- a/src/MTXRequest.h
+++ b/src/MTXRequest.h
@@ -70,6 +70,11 @@ typedef void (^mtx_request_block_t)(mtx_response_t _Nullable response,
  */
 @property (copy, nonatomic) OFString *path;
 
+/**
+ * @brief The query for the request.
+ */
+@property (copy, nullable, nonatomic) OFString *query;
+
 /**
  * @brief An optional body to send along with the request.
  *
diff --git a/src/MTXRequest.m b/src/MTXRequest.m
index 0b8dd21..8f9ec38 100644
--- a/src/MTXRequest.m
+++ b/src/MTXRequest.m
@@ -97,6 +97,7 @@
 
 	OFMutableURL *requestURL = [[_homeserver mutableCopy] autorelease];
 	requestURL.path = _path;
+	requestURL.query = _query;
 
 	OFMutableDictionary *headers = [OFMutableDictionary dictionary];
 	headers[@"User-Agent"] = @"ObjMatrix";
diff --git a/src/ObjMatrix.h b/src/ObjMatrix.h
index 9ff8407..e42a9ac 100644
--- a/src/ObjMatrix.h
+++ b/src/ObjMatrix.h
@@ -25,8 +25,11 @@
 #import "MTXSQLite3Storage.h"
 #import "MTXStorage.h"
 
+#import "MTXClientException.h"
 #import "MTXFetchRoomListFailedException.h"
 #import "MTXJoinRoomFailedException.h"
 #import "MTXLeaveRoomFailedException.h"
 #import "MTXLoginFailedException.h"
 #import "MTXLogoutFailedException.h"
+#import "MTXSendMessageFailedException.h"
+#import "MTXSyncFailedException.h"
diff --git a/src/exceptions/MTXFetchRoomListFailedException.m b/src/exceptions/MTXFetchRoomListFailedException.m
index 4f0c158..60eb29f 100644
--- a/src/exceptions/MTXFetchRoomListFailedException.m
+++ b/src/exceptions/MTXFetchRoomListFailedException.m
@@ -28,7 +28,7 @@
 - (OFString *)description
 {
 	return [OFString stringWithFormat:
-	    @"Failed to fetch room list for %@: %@",
-	    self.client.userID, self.response];
+	    @"Failed to fetch room list for %@ with status code %d: %@",
+	    self.client.userID, self.statusCode, self.response];
 }
 @end
diff --git a/src/exceptions/MTXJoinRoomFailedException.m b/src/exceptions/MTXJoinRoomFailedException.m
index 3b83b3b..eec94df 100644
--- a/src/exceptions/MTXJoinRoomFailedException.m
+++ b/src/exceptions/MTXJoinRoomFailedException.m
@@ -65,7 +65,7 @@
 - (OFString *)description
 {
 	return [OFString stringWithFormat:
-	    @"Failed to join room %@ for %@: %@",
-	    _room, self.client.userID, self.response];
+	    @"Failed to join room %@ for %@ with status code %d: %@",
+	    _room, self.client.userID, self.statusCode, self.response];
 }
 @end
diff --git a/src/exceptions/MTXLeaveRoomFailedException.m b/src/exceptions/MTXLeaveRoomFailedException.m
index 558f486..28a3cab 100644
--- a/src/exceptions/MTXLeaveRoomFailedException.m
+++ b/src/exceptions/MTXLeaveRoomFailedException.m
@@ -65,7 +65,7 @@
 - (OFString *)description
 {
 	return [OFString stringWithFormat:
-	    @"Failed to leave room %@ for %@: %@",
-	    _roomID, self.client.userID, self.response];
+	    @"Failed to leave room %@ for %@ with status code %d: %@",
+	    _roomID, self.client.userID, self.statusCode, self.response];
 }
 @end
diff --git a/src/exceptions/MTXLoginFailedException.m b/src/exceptions/MTXLoginFailedException.m
index aa1257f..aba4440 100644
--- a/src/exceptions/MTXLoginFailedException.m
+++ b/src/exceptions/MTXLoginFailedException.m
@@ -66,7 +66,7 @@
 - (OFString *)description
 {
 	return [OFString stringWithFormat:
-	    @"Failed to log in user %@ on %@: %@",
-	    _user, _homeserver, _response];
+	    @"Failed to log in user %@ on %@ with status code %d: %@",
+	    _user, _homeserver, _statusCode, _response];
 }
 @end
diff --git a/src/exceptions/MTXLogoutFailedException.m b/src/exceptions/MTXLogoutFailedException.m
index f87c9fa..c1d1158 100644
--- a/src/exceptions/MTXLogoutFailedException.m
+++ b/src/exceptions/MTXLogoutFailedException.m
@@ -28,7 +28,7 @@
 - (OFString *)description
 {
 	return [OFString stringWithFormat:
-	    @"Failed to log out user %@: %@",
-	    self.client.userID, self.response];
+	    @"Failed to log out user %@ with status code: %@",
+	    self.client.userID, self.statusCode, self.response];
 }
 @end
diff --git a/src/exceptions/MTXSendMessageFailedException.m b/src/exceptions/MTXSendMessageFailedException.m
index 8409ad6..a9531e0 100644
--- a/src/exceptions/MTXSendMessageFailedException.m
+++ b/src/exceptions/MTXSendMessageFailedException.m
@@ -70,7 +70,7 @@
 - (OFString *)description
 {
 	return [OFString stringWithFormat:
-	    @"Failed to send message to room %@ for %@: %@",
-	    _roomID, self.client.userID, self.response];
+	    @"Failed to send message to room %@ for %@ with status code %d: %@",
+	    _roomID, self.client.userID, self.statusCode, self.response];
 }
 @end
diff --git a/src/exceptions/MTXSyncFailedException.h b/src/exceptions/MTXSyncFailedException.h
new file mode 100644
index 0000000..02d9084
--- /dev/null
+++ b/src/exceptions/MTXSyncFailedException.h
@@ -0,0 +1,32 @@
+/*
+ * Copyright (c) 2020, Jonathan Schleifer <js@nil.im>
+ *
+ * https://fossil.nil.im/objmatrix
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice is present in all copies.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#import <ObjFW/ObjFW.h>
+
+#import "MTXClientException.h"
+
+OF_ASSUME_NONNULL_BEGIN
+
+@interface MTXSyncFailedException: MTXClientException
+@end
+
+OF_ASSUME_NONNULL_END
diff --git a/src/exceptions/MTXSyncFailedException.m b/src/exceptions/MTXSyncFailedException.m
new file mode 100644
index 0000000..ab66805
--- /dev/null
+++ b/src/exceptions/MTXSyncFailedException.m
@@ -0,0 +1,34 @@
+/*
+ * Copyright (c) 2020, Jonathan Schleifer <js@nil.im>
+ *
+ * https://fossil.nil.im/objmatrix
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice is present in all copies.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#import "MTXSyncFailedException.h"
+
+#import "MTXClient.h"
+
+@implementation MTXSyncFailedException
+- (OFString *)description
+{
+	return [OFString stringWithFormat:
+	    @"Failed to sync for user %@ with status code %d: %@",
+	    self.client.userID, self.statusCode, self.response];
+}
+@end
diff --git a/src/exceptions/Makefile b/src/exceptions/Makefile
index bc23e67..99ec833 100644
--- a/src/exceptions/Makefile
+++ b/src/exceptions/Makefile
@@ -9,7 +9,8 @@ SRCS = MTXClientException.m			\
        MTXLeaveRoomFailedException.m		\
        MTXLoginFailedException.m		\
        MTXLogoutFailedException.m		\
-       MTXSendMessageFailedException.m
+       MTXSendMessageFailedException.m		\
+       MTXSyncFailedException.m
 INCLUDES = ${SRCS:.m=.h}
 
 include ../../buildsys.mk
diff --git a/tests/tests.m b/tests/tests.m
index c49abf4..6102f50 100644
--- a/tests/tests.m
+++ b/tests/tests.m
@@ -62,6 +62,21 @@ OF_APPLICATION_DELEGATE(Tests)
 		_client = [client retain];
 		of_log(@"Logged in client: %@", _client);
 
+		[self sync];
+	}];
+}
+
+- (void)sync
+{
+	[_client syncWithTimeout: 5
+			   block: ^ (id exception) {
+		if (exception != nil) {
+			of_log(@"Failed to sync: %@", exception);
+			[OFApplication terminateWithStatus: 1];
+		}
+
+		of_log(@"Synced");
+
 		[self fetchRoomList];
 	}];
 }