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diff --git a/src/DotNetOpenAuth/OAuth2/Messages/AccessTokenRequestBase.cs b/src/DotNetOpenAuth/OAuth2/Messages/AccessTokenRequestBase.cs
new file mode 100644
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+++ b/src/DotNetOpenAuth/OAuth2/Messages/AccessTokenRequestBase.cs
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+//-----------------------------------------------------------------------
+// <copyright file="AccessTokenRequestBase.cs" company="Andrew Arnott">
+//     Copyright (c) Andrew Arnott. All rights reserved.
+// </copyright>
+//-----------------------------------------------------------------------
+
+namespace DotNetOpenAuth.OAuth2.Messages {
+	using System;
+	using System.Collections.Generic;
+	using System.Linq;
+	using System.Text;
+	using DotNetOpenAuth.Configuration;
+	using DotNetOpenAuth.Messaging;
+	using DotNetOpenAuth.OAuth2.ChannelElements;
+
+	/// <summary>
+	/// A message sent from the client to the authorization server to exchange a previously obtained grant for an access token.
+	/// </summary>
+	public abstract class AccessTokenRequestBase : AuthenticatedClientRequestBase {
+		/// <summary>
+		/// Initializes a new instance of the <see cref="AccessTokenRequestBase"/> class.
+		/// </summary>
+		/// <param name="tokenEndpoint">The Authorization Server's access token endpoint URL.</param>
+		/// <param name="version">The version.</param>
+		protected AccessTokenRequestBase(Uri tokenEndpoint, Version version)
+			: base(tokenEndpoint, version) {
+			this.HttpMethods = HttpDeliveryMethods.PostRequest;
+			this.Scope = new HashSet<string>(OAuthUtilities.ScopeStringComparer);
+		}
+
+		/// <summary>
+		/// Gets the type of the grant.
+		/// </summary>
+		/// <value>The type of the grant.</value>
+		[MessagePart(Protocol.grant_type, IsRequired = true, AllowEmpty = false, Encoder = typeof(GrantTypeEncoder))]
+		internal abstract GrantType GrantType { get; }
+
+		/// <summary>
+		/// Gets the set of scopes the Client would like the access token to provide access to.
+		/// </summary>
+		/// <value>A set of scopes.  Never null.</value>
+		[MessagePart(Protocol.scope, IsRequired = false, AllowEmpty = true, Encoder = typeof(ScopeEncoder))]
+		internal HashSet<string> Scope { get; private set; }
+
+		/// <summary>
+		/// Checks the message state for conformity to the protocol specification
+		/// and throws an exception if the message is invalid.
+		/// </summary>
+		/// <remarks>
+		/// 	<para>Some messages have required fields, or combinations of fields that must relate to each other
+		/// in specialized ways.  After deserializing a message, this method checks the state of the
+		/// message to see if it conforms to the protocol.</para>
+		/// 	<para>Note that this property should <i>not</i> check signatures or perform any state checks
+		/// outside this scope of this particular message.</para>
+		/// </remarks>
+		/// <exception cref="ProtocolException">Thrown if the message is invalid.</exception>
+		protected override void EnsureValidMessage() {
+			base.EnsureValidMessage();
+			ErrorUtilities.VerifyProtocol(
+				DotNetOpenAuthSection.Configuration.Messaging.RelaxSslRequirements || this.Recipient.IsTransportSecure(),
+				OAuthStrings.HttpsRequired);
+		}
+	}
+}