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diff --git a/src/DotNetOpenAuth.OpenId/OpenId/IProviderEndpoint.cs b/src/DotNetOpenAuth.OpenId/OpenId/IProviderEndpoint.cs
new file mode 100644
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+++ b/src/DotNetOpenAuth.OpenId/OpenId/IProviderEndpoint.cs
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+//-----------------------------------------------------------------------
+// <copyright file="IProviderEndpoint.cs" company="Andrew Arnott">
+//     Copyright (c) Andrew Arnott. All rights reserved.
+// </copyright>
+//-----------------------------------------------------------------------
+
+namespace DotNetOpenAuth.OpenId.RelyingParty {
+	using System;
+	using System.Collections.ObjectModel;
+	using System.Diagnostics.CodeAnalysis;
+	using System.Diagnostics.Contracts;
+	using System.Globalization;
+	using DotNetOpenAuth.Messaging;
+	using DotNetOpenAuth.OpenId.Messages;
+
+	/// <summary>
+	/// Information published about an OpenId Provider by the
+	/// OpenId discovery documents found at a user's Claimed Identifier.
+	/// </summary>
+	/// <remarks>
+	/// Because information provided by this interface is suppplied by a 
+	/// user's individually published documents, it may be incomplete or inaccurate.
+	/// </remarks>
+	[ContractClass(typeof(IProviderEndpointContract))]
+	public interface IProviderEndpoint {
+		/// <summary>
+		/// Gets the detected version of OpenID implemented by the Provider.
+		/// </summary>
+		Version Version { get; }
+
+		/// <summary>
+		/// Gets the URL that the OpenID Provider receives authentication requests at.
+		/// </summary>
+		/// <value>
+		/// This value MUST be an absolute HTTP or HTTPS URL.
+		/// </value>
+		Uri Uri { get; }
+
+		/// <summary>
+		/// Checks whether the OpenId Identifier claims support for a given extension.
+		/// </summary>
+		/// <typeparam name="T">The extension whose support is being queried.</typeparam>
+		/// <returns>True if support for the extension is advertised.  False otherwise.</returns>
+		/// <remarks>
+		/// Note that a true or false return value is no guarantee of a Provider's 
+		/// support for or lack of support for an extension.  The return value is
+		/// determined by how the authenticating user filled out his/her XRDS document only.
+		/// The only way to be sure of support for a given extension is to include
+		/// the extension in the request and see if a response comes back for that extension.
+		/// </remarks>
+		[SuppressMessage("Microsoft.Design", "CA1004:GenericMethodsShouldProvideTypeParameter", Justification = "No parameter at all.")]
+		[Obsolete("Use IAuthenticationRequest.DiscoveryResult.IsExtensionSupported instead.")]
+		bool IsExtensionSupported<T>() where T : IOpenIdMessageExtension, new();
+
+		/// <summary>
+		/// Checks whether the OpenId Identifier claims support for a given extension.
+		/// </summary>
+		/// <param name="extensionType">The extension whose support is being queried.</param>
+		/// <returns>True if support for the extension is advertised.  False otherwise.</returns>
+		/// <remarks>
+		/// Note that a true or false return value is no guarantee of a Provider's 
+		/// support for or lack of support for an extension.  The return value is
+		/// determined by how the authenticating user filled out his/her XRDS document only.
+		/// The only way to be sure of support for a given extension is to include
+		/// the extension in the request and see if a response comes back for that extension.
+		/// </remarks>
+		[Obsolete("Use IAuthenticationRequest.DiscoveryResult.IsExtensionSupported instead.")]
+		bool IsExtensionSupported(Type extensionType);
+	}
+
+	/// <summary>
+	/// Code contract for the <see cref="IProviderEndpoint"/> type.
+	/// </summary>
+	[ContractClassFor(typeof(IProviderEndpoint))]
+	internal abstract class IProviderEndpointContract : IProviderEndpoint {
+		/// <summary>
+		/// Prevents a default instance of the <see cref="IProviderEndpointContract"/> class from being created.
+		/// </summary>
+		private IProviderEndpointContract() {
+		}
+
+		#region IProviderEndpoint Members
+
+		/// <summary>
+		/// Gets the detected version of OpenID implemented by the Provider.
+		/// </summary>
+		Version IProviderEndpoint.Version {
+			get {
+				Contract.Ensures(Contract.Result<Version>() != null);
+				throw new System.NotImplementedException();
+			}
+		}
+
+		/// <summary>
+		/// Gets the URL that the OpenID Provider receives authentication requests at.
+		/// </summary>
+		Uri IProviderEndpoint.Uri {
+			get {
+				Contract.Ensures(Contract.Result<Uri>() != null);
+				throw new System.NotImplementedException();
+			}
+		}
+
+		/// <summary>
+		/// Checks whether the OpenId Identifier claims support for a given extension.
+		/// </summary>
+		/// <typeparam name="T">The extension whose support is being queried.</typeparam>
+		/// <returns>
+		/// True if support for the extension is advertised.  False otherwise.
+		/// </returns>
+		/// <remarks>
+		/// Note that a true or false return value is no guarantee of a Provider's
+		/// support for or lack of support for an extension.  The return value is
+		/// determined by how the authenticating user filled out his/her XRDS document only.
+		/// The only way to be sure of support for a given extension is to include
+		/// the extension in the request and see if a response comes back for that extension.
+		/// </remarks>
+		bool IProviderEndpoint.IsExtensionSupported<T>() {
+			throw new NotImplementedException();
+		}
+
+		/// <summary>
+		/// Checks whether the OpenId Identifier claims support for a given extension.
+		/// </summary>
+		/// <param name="extensionType">The extension whose support is being queried.</param>
+		/// <returns>
+		/// True if support for the extension is advertised.  False otherwise.
+		/// </returns>
+		/// <remarks>
+		/// Note that a true or false return value is no guarantee of a Provider's
+		/// support for or lack of support for an extension.  The return value is
+		/// determined by how the authenticating user filled out his/her XRDS document only.
+		/// The only way to be sure of support for a given extension is to include
+		/// the extension in the request and see if a response comes back for that extension.
+		/// </remarks>
+		bool IProviderEndpoint.IsExtensionSupported(Type extensionType) {
+			Contract.Requires<ArgumentNullException>(extensionType != null);
+			Contract.Requires<ArgumentException>(typeof(IOpenIdMessageExtension).IsAssignableFrom(extensionType));
+			throw new NotImplementedException();
+		}
+
+		#endregion
+	}
+}