diff --git a/Jellyfin.Api/Controllers/SyncPlayController.cs b/Jellyfin.Api/Controllers/SyncPlayController.cs
new file mode 100644
index 0000000000..55ed42227d
--- /dev/null
+++ b/Jellyfin.Api/Controllers/SyncPlayController.cs
@@ -0,0 +1,205 @@
+using System;
+using System.Collections.Generic;
+using System.ComponentModel.DataAnnotations;
+using System.Threading;
+using Jellyfin.Api.Constants;
+using Jellyfin.Api.Helpers;
+using MediaBrowser.Controller.Net;
+using MediaBrowser.Controller.Session;
+using MediaBrowser.Controller.SyncPlay;
+using MediaBrowser.Model.SyncPlay;
+using Microsoft.AspNetCore.Authorization;
+using Microsoft.AspNetCore.Http;
+using Microsoft.AspNetCore.Mvc;
+
+namespace Jellyfin.Api.Controllers
+{
+    /// <summary>
+    /// The sync play controller.
+    /// </summary>
+    [Authorize(Policy = Policies.DefaultAuthorization)]
+    public class SyncPlayController : BaseJellyfinApiController
+    {
+        private readonly ISessionManager _sessionManager;
+        private readonly IAuthorizationContext _authorizationContext;
+        private readonly ISyncPlayManager _syncPlayManager;
+
+        /// <summary>
+        /// Initializes a new instance of the <see cref="SyncPlayController"/> class.
+        /// </summary>
+        /// <param name="sessionManager">Instance of the <see cref="ISessionManager"/> interface.</param>
+        /// <param name="authorizationContext">Instance of the <see cref="IAuthorizationContext"/> interface.</param>
+        /// <param name="syncPlayManager">Instance of the <see cref="ISyncPlayManager"/> interface.</param>
+        public SyncPlayController(
+            ISessionManager sessionManager,
+            IAuthorizationContext authorizationContext,
+            ISyncPlayManager syncPlayManager)
+        {
+            _sessionManager = sessionManager;
+            _authorizationContext = authorizationContext;
+            _syncPlayManager = syncPlayManager;
+        }
+
+        /// <summary>
+        /// Create a new SyncPlay group.
+        /// </summary>
+        /// <response code="204">New group created.</response>
+        /// <returns>A <see cref="NoContentResult"/> indicating success.</returns>
+        [HttpPost("New")]
+        [ProducesResponseType(StatusCodes.Status204NoContent)]
+        public ActionResult CreateNewGroup()
+        {
+            var currentSession = RequestHelpers.GetSession(_sessionManager, _authorizationContext, Request);
+            _syncPlayManager.NewGroup(currentSession, CancellationToken.None);
+            return NoContent();
+        }
+
+        /// <summary>
+        /// Join an existing SyncPlay group.
+        /// </summary>
+        /// <param name="groupId">The sync play group id.</param>
+        /// <response code="204">Group join successful.</response>
+        /// <returns>A <see cref="NoContentResult"/> indicating success.</returns>
+        [HttpPost("Join")]
+        [ProducesResponseType(StatusCodes.Status204NoContent)]
+        public ActionResult JoinGroup([FromQuery, Required] Guid groupId)
+        {
+            var currentSession = RequestHelpers.GetSession(_sessionManager, _authorizationContext, Request);
+
+            var joinRequest = new JoinGroupRequest()
+            {
+                GroupId = groupId
+            };
+
+            _syncPlayManager.JoinGroup(currentSession, groupId, joinRequest, CancellationToken.None);
+            return NoContent();
+        }
+
+        /// <summary>
+        /// Leave the joined SyncPlay group.
+        /// </summary>
+        /// <response code="204">Group leave successful.</response>
+        /// <returns>A <see cref="NoContentResult"/> indicating success.</returns>
+        [HttpPost("Leave")]
+        [ProducesResponseType(StatusCodes.Status204NoContent)]
+        public ActionResult LeaveGroup()
+        {
+            var currentSession = RequestHelpers.GetSession(_sessionManager, _authorizationContext, Request);
+            _syncPlayManager.LeaveGroup(currentSession, CancellationToken.None);
+            return NoContent();
+        }
+
+        /// <summary>
+        /// Gets all SyncPlay groups.
+        /// </summary>
+        /// <param name="filterItemId">Optional. Filter by item id.</param>
+        /// <response code="200">Groups returned.</response>
+        /// <returns>An <see cref="IEnumerable{GrouüInfoView}"/> containing the available SyncPlay groups.</returns>
+        [HttpGet("List")]
+        [ProducesResponseType(StatusCodes.Status200OK)]
+        public ActionResult<IEnumerable<GroupInfoView>> GetSyncPlayGroups([FromQuery] Guid? filterItemId)
+        {
+            var currentSession = RequestHelpers.GetSession(_sessionManager, _authorizationContext, Request);
+            return Ok(_syncPlayManager.ListGroups(currentSession, filterItemId.HasValue ? filterItemId.Value : Guid.Empty));
+        }
+
+        /// <summary>
+        /// Request play in SyncPlay group.
+        /// </summary>
+        /// <response code="204">Play request sent to all group members.</response>
+        /// <returns>A <see cref="NoContentResult"/> indicating success.</returns>
+        [HttpPost("Play")]
+        [ProducesResponseType(StatusCodes.Status204NoContent)]
+        public ActionResult Play()
+        {
+            var currentSession = RequestHelpers.GetSession(_sessionManager, _authorizationContext, Request);
+            var syncPlayRequest = new PlaybackRequest()
+            {
+                Type = PlaybackRequestType.Play
+            };
+            _syncPlayManager.HandleRequest(currentSession, syncPlayRequest, CancellationToken.None);
+            return NoContent();
+        }
+
+        /// <summary>
+        /// Request pause in SyncPlay group.
+        /// </summary>
+        /// <response code="204">Pause request sent to all group members.</response>
+        /// <returns>A <see cref="NoContentResult"/> indicating success.</returns>
+        [HttpPost("Pause")]
+        [ProducesResponseType(StatusCodes.Status204NoContent)]
+        public ActionResult Pause()
+        {
+            var currentSession = RequestHelpers.GetSession(_sessionManager, _authorizationContext, Request);
+            var syncPlayRequest = new PlaybackRequest()
+            {
+                Type = PlaybackRequestType.Pause
+            };
+            _syncPlayManager.HandleRequest(currentSession, syncPlayRequest, CancellationToken.None);
+            return NoContent();
+        }
+
+        /// <summary>
+        /// Request seek in SyncPlay group.
+        /// </summary>
+        /// <param name="positionTicks">The playback position in ticks.</param>
+        /// <response code="204">Seek request sent to all group members.</response>
+        /// <returns>A <see cref="NoContentResult"/> indicating success.</returns>
+        [HttpPost("Seek")]
+        [ProducesResponseType(StatusCodes.Status204NoContent)]
+        public ActionResult Seek([FromQuery] long positionTicks)
+        {
+            var currentSession = RequestHelpers.GetSession(_sessionManager, _authorizationContext, Request);
+            var syncPlayRequest = new PlaybackRequest()
+            {
+                Type = PlaybackRequestType.Seek,
+                PositionTicks = positionTicks
+            };
+            _syncPlayManager.HandleRequest(currentSession, syncPlayRequest, CancellationToken.None);
+            return NoContent();
+        }
+
+        /// <summary>
+        /// Request group wait in SyncPlay group while buffering.
+        /// </summary>
+        /// <param name="when">When the request has been made by the client.</param>
+        /// <param name="positionTicks">The playback position in ticks.</param>
+        /// <param name="bufferingDone">Whether the buffering is done.</param>
+        /// <response code="204">Buffering request sent to all group members.</response>
+        /// <returns>A <see cref="NoContentResult"/> indicating success.</returns>
+        [HttpPost("Buffering")]
+        [ProducesResponseType(StatusCodes.Status204NoContent)]
+        public ActionResult Buffering([FromQuery] DateTime when, [FromQuery] long positionTicks, [FromQuery] bool bufferingDone)
+        {
+            var currentSession = RequestHelpers.GetSession(_sessionManager, _authorizationContext, Request);
+            var syncPlayRequest = new PlaybackRequest()
+            {
+                Type = bufferingDone ? PlaybackRequestType.Ready : PlaybackRequestType.Buffer,
+                When = when,
+                PositionTicks = positionTicks
+            };
+            _syncPlayManager.HandleRequest(currentSession, syncPlayRequest, CancellationToken.None);
+            return NoContent();
+        }
+
+        /// <summary>
+        /// Update session ping.
+        /// </summary>
+        /// <param name="ping">The ping.</param>
+        /// <response code="204">Ping updated.</response>
+        /// <returns>A <see cref="NoContentResult"/> indicating success.</returns>
+        [HttpPost("Ping")]
+        [ProducesResponseType(StatusCodes.Status204NoContent)]
+        public ActionResult Ping([FromQuery] double ping)
+        {
+            var currentSession = RequestHelpers.GetSession(_sessionManager, _authorizationContext, Request);
+            var syncPlayRequest = new PlaybackRequest()
+            {
+                Type = PlaybackRequestType.Ping,
+                Ping = Convert.ToInt64(ping)
+            };
+            _syncPlayManager.HandleRequest(currentSession, syncPlayRequest, CancellationToken.None);
+            return NoContent();
+        }
+    }
+}
diff --git a/Jellyfin.Api/Controllers/TimeSyncController.cs b/Jellyfin.Api/Controllers/TimeSyncController.cs
new file mode 100644
index 0000000000..57a720b26c
--- /dev/null
+++ b/Jellyfin.Api/Controllers/TimeSyncController.cs
@@ -0,0 +1,39 @@
+using System;
+using System.Globalization;
+using MediaBrowser.Model.SyncPlay;
+using Microsoft.AspNetCore.Http;
+using Microsoft.AspNetCore.Mvc;
+
+namespace Jellyfin.Api.Controllers
+{
+    /// <summary>
+    /// The time sync controller.
+    /// </summary>
+    [Route("/GetUtcTime")]
+    public class TimeSyncController : BaseJellyfinApiController
+    {
+        /// <summary>
+        /// Gets the current utc time.
+        /// </summary>
+        /// <response code="200">Time returned.</response>
+        /// <returns>An <see cref="UtcTimeResponse"/> to sync the client and server time.</returns>
+        [HttpGet]
+        [ProducesResponseType(statusCode: StatusCodes.Status200OK)]
+        public ActionResult<UtcTimeResponse> GetUtcTime()
+        {
+            // Important to keep the following line at the beginning
+            var requestReceptionTime = DateTime.UtcNow.ToUniversalTime().ToString("o", DateTimeFormatInfo.InvariantInfo);
+
+            var response = new UtcTimeResponse();
+            response.RequestReceptionTime = requestReceptionTime;
+
+            // Important to keep the following two lines at the end
+            var responseTransmissionTime = DateTime.UtcNow.ToUniversalTime().ToString("o", DateTimeFormatInfo.InvariantInfo);
+            response.ResponseTransmissionTime = responseTransmissionTime;
+
+            // Implementing NTP on such a high level results in this useless
+            // information being sent. On the other hand it enables future additions.
+            return response;
+        }
+    }
+}
diff --git a/MediaBrowser.Api/SyncPlay/SyncPlayService.cs b/MediaBrowser.Api/SyncPlay/SyncPlayService.cs
deleted file mode 100644
index daa1b521f4..0000000000
--- a/MediaBrowser.Api/SyncPlay/SyncPlayService.cs
+++ /dev/null
@@ -1,262 +0,0 @@
-using System.Threading;
-using System;
-using System.Collections.Generic;
-using MediaBrowser.Controller.Configuration;
-using MediaBrowser.Controller.Net;
-using MediaBrowser.Controller.Session;
-using MediaBrowser.Controller.SyncPlay;
-using MediaBrowser.Model.Services;
-using MediaBrowser.Model.SyncPlay;
-using Microsoft.Extensions.Logging;
-
-namespace MediaBrowser.Api.SyncPlay
-{
-    [Route("/SyncPlay/New", "POST", Summary = "Create a new SyncPlay group")]
-    [Authenticated]
-    public class SyncPlayNew : IReturnVoid
-    {
-    }
-
-    [Route("/SyncPlay/Join", "POST", Summary = "Join an existing SyncPlay group")]
-    [Authenticated]
-    public class SyncPlayJoin : IReturnVoid
-    {
-        /// <summary>
-        /// Gets or sets the Group id.
-        /// </summary>
-        /// <value>The Group id to join.</value>
-        [ApiMember(Name = "GroupId", Description = "Group Id", IsRequired = true, DataType = "string", ParameterType = "query", Verb = "POST")]
-        public string GroupId { get; set; }
-    }
-
-    [Route("/SyncPlay/Leave", "POST", Summary = "Leave joined SyncPlay group")]
-    [Authenticated]
-    public class SyncPlayLeave : IReturnVoid
-    {
-    }
-
-    [Route("/SyncPlay/List", "GET", Summary = "List SyncPlay groups")]
-    [Authenticated]
-    public class SyncPlayList : IReturnVoid
-    {
-        /// <summary>
-        /// Gets or sets the filter item id.
-        /// </summary>
-        /// <value>The filter item id.</value>
-        [ApiMember(Name = "FilterItemId", Description = "Filter by item id", IsRequired = false, DataType = "string", ParameterType = "query", Verb = "GET")]
-        public string FilterItemId { get; set; }
-    }
-
-    [Route("/SyncPlay/Play", "POST", Summary = "Request play in SyncPlay group")]
-    [Authenticated]
-    public class SyncPlayPlay : IReturnVoid
-    {
-    }
-
-    [Route("/SyncPlay/Pause", "POST", Summary = "Request pause in SyncPlay group")]
-    [Authenticated]
-    public class SyncPlayPause : IReturnVoid
-    {
-    }
-
-    [Route("/SyncPlay/Seek", "POST", Summary = "Request seek in SyncPlay group")]
-    [Authenticated]
-    public class SyncPlaySeek : IReturnVoid
-    {
-        [ApiMember(Name = "PositionTicks", IsRequired = true, DataType = "long", ParameterType = "query", Verb = "POST")]
-        public long PositionTicks { get; set; }
-    }
-
-    [Route("/SyncPlay/Buffering", "POST", Summary = "Request group wait in SyncPlay group while buffering")]
-    [Authenticated]
-    public class SyncPlayBuffering : IReturnVoid
-    {
-        /// <summary>
-        /// Gets or sets the date used to pin PositionTicks in time.
-        /// </summary>
-        /// <value>The date related to PositionTicks.</value>
-        [ApiMember(Name = "When", IsRequired = true, DataType = "string", ParameterType = "query", Verb = "POST")]
-        public string When { get; set; }
-
-        [ApiMember(Name = "PositionTicks", IsRequired = true, DataType = "long", ParameterType = "query", Verb = "POST")]
-        public long PositionTicks { get; set; }
-
-        /// <summary>
-        /// Gets or sets whether this is a buffering or a ready request.
-        /// </summary>
-        /// <value><c>true</c> if buffering is complete; <c>false</c> otherwise.</value>
-        [ApiMember(Name = "BufferingDone", IsRequired = true, DataType = "bool", ParameterType = "query", Verb = "POST")]
-        public bool BufferingDone { get; set; }
-    }
-
-    [Route("/SyncPlay/Ping", "POST", Summary = "Update session ping")]
-    [Authenticated]
-    public class SyncPlayPing : IReturnVoid
-    {
-        [ApiMember(Name = "Ping", IsRequired = true, DataType = "double", ParameterType = "query", Verb = "POST")]
-        public double Ping { get; set; }
-    }
-
-    /// <summary>
-    /// Class SyncPlayService.
-    /// </summary>
-    public class SyncPlayService : BaseApiService
-    {
-        /// <summary>
-        /// The session context.
-        /// </summary>
-        private readonly ISessionContext _sessionContext;
-
-        /// <summary>
-        /// The SyncPlay manager.
-        /// </summary>
-        private readonly ISyncPlayManager _syncPlayManager;
-
-        public SyncPlayService(
-            ILogger<SyncPlayService> logger,
-            IServerConfigurationManager serverConfigurationManager,
-            IHttpResultFactory httpResultFactory,
-            ISessionContext sessionContext,
-            ISyncPlayManager syncPlayManager)
-            : base(logger, serverConfigurationManager, httpResultFactory)
-        {
-            _sessionContext = sessionContext;
-            _syncPlayManager = syncPlayManager;
-        }
-
-        /// <summary>
-        /// Handles the specified request.
-        /// </summary>
-        /// <param name="request">The request.</param>
-        public void Post(SyncPlayNew request)
-        {
-            var currentSession = GetSession(_sessionContext);
-            _syncPlayManager.NewGroup(currentSession, CancellationToken.None);
-        }
-
-        /// <summary>
-        /// Handles the specified request.
-        /// </summary>
-        /// <param name="request">The request.</param>
-        public void Post(SyncPlayJoin request)
-        {
-            var currentSession = GetSession(_sessionContext);
-
-            Guid groupId;
-            if (!Guid.TryParse(request.GroupId, out groupId))
-            {
-                Logger.LogError("JoinGroup: {0} is not a valid format for GroupId. Ignoring request.", request.GroupId);
-                return;
-            }
-
-            var joinRequest = new JoinGroupRequest()
-            {
-                GroupId = groupId
-            };
-
-            _syncPlayManager.JoinGroup(currentSession, groupId, joinRequest, CancellationToken.None);
-        }
-
-        /// <summary>
-        /// Handles the specified request.
-        /// </summary>
-        /// <param name="request">The request.</param>
-        public void Post(SyncPlayLeave request)
-        {
-            var currentSession = GetSession(_sessionContext);
-            _syncPlayManager.LeaveGroup(currentSession, CancellationToken.None);
-        }
-
-        /// <summary>
-        /// Handles the specified request.
-        /// </summary>
-        /// <param name="request">The request.</param>
-        /// <value>The requested list of groups.</value>
-        public List<GroupInfoView> Get(SyncPlayList request)
-        {
-            var currentSession = GetSession(_sessionContext);
-            var filterItemId = Guid.Empty;
-
-            if (!string.IsNullOrEmpty(request.FilterItemId) && !Guid.TryParse(request.FilterItemId, out filterItemId))
-            {
-                Logger.LogWarning("ListGroups: {0} is not a valid format for FilterItemId. Ignoring filter.", request.FilterItemId);
-            }
-
-            return _syncPlayManager.ListGroups(currentSession, filterItemId);
-        }
-
-        /// <summary>
-        /// Handles the specified request.
-        /// </summary>
-        /// <param name="request">The request.</param>
-        public void Post(SyncPlayPlay request)
-        {
-            var currentSession = GetSession(_sessionContext);
-            var syncPlayRequest = new PlaybackRequest()
-            {
-                Type = PlaybackRequestType.Play
-            };
-            _syncPlayManager.HandleRequest(currentSession, syncPlayRequest, CancellationToken.None);
-        }
-
-        /// <summary>
-        /// Handles the specified request.
-        /// </summary>
-        /// <param name="request">The request.</param>
-        public void Post(SyncPlayPause request)
-        {
-            var currentSession = GetSession(_sessionContext);
-            var syncPlayRequest = new PlaybackRequest()
-            {
-                Type = PlaybackRequestType.Pause
-            };
-            _syncPlayManager.HandleRequest(currentSession, syncPlayRequest, CancellationToken.None);
-        }
-
-        /// <summary>
-        /// Handles the specified request.
-        /// </summary>
-        /// <param name="request">The request.</param>
-        public void Post(SyncPlaySeek request)
-        {
-            var currentSession = GetSession(_sessionContext);
-            var syncPlayRequest = new PlaybackRequest()
-            {
-                Type = PlaybackRequestType.Seek,
-                PositionTicks = request.PositionTicks
-            };
-            _syncPlayManager.HandleRequest(currentSession, syncPlayRequest, CancellationToken.None);
-        }
-
-        /// <summary>
-        /// Handles the specified request.
-        /// </summary>
-        /// <param name="request">The request.</param>
-        public void Post(SyncPlayBuffering request)
-        {
-            var currentSession = GetSession(_sessionContext);
-            var syncPlayRequest = new PlaybackRequest()
-            {
-                Type = request.BufferingDone ? PlaybackRequestType.Ready : PlaybackRequestType.Buffer,
-                When = DateTime.Parse(request.When),
-                PositionTicks = request.PositionTicks
-            };
-            _syncPlayManager.HandleRequest(currentSession, syncPlayRequest, CancellationToken.None);
-        }
-
-        /// <summary>
-        /// Handles the specified request.
-        /// </summary>
-        /// <param name="request">The request.</param>
-        public void Post(SyncPlayPing request)
-        {
-            var currentSession = GetSession(_sessionContext);
-            var syncPlayRequest = new PlaybackRequest()
-            {
-                Type = PlaybackRequestType.Ping,
-                Ping = Convert.ToInt64(request.Ping)
-            };
-            _syncPlayManager.HandleRequest(currentSession, syncPlayRequest, CancellationToken.None);
-        }
-    }
-}
diff --git a/MediaBrowser.Api/SyncPlay/TimeSyncService.cs b/MediaBrowser.Api/SyncPlay/TimeSyncService.cs
deleted file mode 100644
index 4a9307e62f..0000000000
--- a/MediaBrowser.Api/SyncPlay/TimeSyncService.cs
+++ /dev/null
@@ -1,52 +0,0 @@
-using System;
-using MediaBrowser.Controller.Configuration;
-using MediaBrowser.Controller.Net;
-using MediaBrowser.Model.Services;
-using MediaBrowser.Model.SyncPlay;
-using Microsoft.Extensions.Logging;
-
-namespace MediaBrowser.Api.SyncPlay
-{
-    [Route("/GetUtcTime", "GET", Summary = "Get UtcTime")]
-    public class GetUtcTime : IReturnVoid
-    {
-        // Nothing
-    }
-
-    /// <summary>
-    /// Class TimeSyncService.
-    /// </summary>
-    public class TimeSyncService : BaseApiService
-    {
-        public TimeSyncService(
-            ILogger<TimeSyncService> logger,
-            IServerConfigurationManager serverConfigurationManager,
-            IHttpResultFactory httpResultFactory)
-            : base(logger, serverConfigurationManager, httpResultFactory)
-        {
-            // Do nothing
-        }
-
-        /// <summary>
-        /// Handles the specified request.
-        /// </summary>
-        /// <param name="request">The request.</param>
-        /// <value>The current UTC time response.</value>
-        public UtcTimeResponse Get(GetUtcTime request)
-        {
-            // Important to keep the following line at the beginning
-            var requestReceptionTime = DateTime.UtcNow.ToUniversalTime().ToString("o");
-
-            var response = new UtcTimeResponse();
-            response.RequestReceptionTime = requestReceptionTime;
-
-            // Important to keep the following two lines at the end
-            var responseTransmissionTime = DateTime.UtcNow.ToUniversalTime().ToString("o");
-            response.ResponseTransmissionTime = responseTransmissionTime;
-
-            // Implementing NTP on such a high level results in this useless
-            // information being sent. On the other hand it enables future additions.
-            return response;
-        }
-    }
-}