diff --git a/ruma-client-api/src/lib.rs b/ruma-client-api/src/lib.rs
index cc57eb98..22b5a1c0 100644
--- a/ruma-client-api/src/lib.rs
+++ b/ruma-client-api/src/lib.rs
@@ -3,6 +3,7 @@
 //! shared by client and server code.
 
 #![deny(missing_copy_implementations, missing_debug_implementations, missing_docs)]
+#![allow(clippy::new_without_default)]
 
 pub mod error;
 pub mod r0;
diff --git a/ruma-client-api/src/unversioned/discover_homeserver.rs b/ruma-client-api/src/unversioned/discover_homeserver.rs
index b82ef0de..dee2c267 100644
--- a/ruma-client-api/src/unversioned/discover_homeserver.rs
+++ b/ruma-client-api/src/unversioned/discover_homeserver.rs
@@ -28,16 +28,46 @@ ruma_api! {
     error: crate::Error
 }
 
+impl Request {
+    /// Creates an empty `Request`.
+    pub fn new() -> Self {
+        Self
+    }
+}
+
+impl Response {
+    /// Creates a `Response` with the given `HomeserverInfo`.
+    pub fn new(homeserver: HomeserverInfo) -> Self {
+        Self { homeserver, identity_server: None }
+    }
+}
+
 /// Information about a discovered homeserver.
 #[derive(Clone, Debug, Deserialize, Hash, PartialEq, PartialOrd, Serialize)]
+#[non_exhaustive]
 pub struct HomeserverInfo {
     /// The base URL for the homeserver for client-server connections.
     pub base_url: String,
 }
 
+impl HomeserverInfo {
+    /// Creates a `HomeserverInfo` with the given `base_url`.
+    pub fn new(base_url: String) -> Self {
+        Self { base_url }
+    }
+}
+
 /// Information about a discovered identity server.
 #[derive(Clone, Debug, Deserialize, Hash, PartialEq, PartialOrd, Serialize)]
+#[non_exhaustive]
 pub struct IdentityServerInfo {
     /// The base URL for the identity server for client-server connections.
     pub base_url: String,
 }
+
+impl IdentityServerInfo {
+    /// Creates an `IdentityServerInfo` with the given `base_url`.
+    pub fn new(base_url: String) -> Self {
+        Self { base_url }
+    }
+}
diff --git a/ruma-client-api/src/unversioned/get_supported_versions.rs b/ruma-client-api/src/unversioned/get_supported_versions.rs
index f248c17e..9f9f692b 100644
--- a/ruma-client-api/src/unversioned/get_supported_versions.rs
+++ b/ruma-client-api/src/unversioned/get_supported_versions.rs
@@ -27,3 +27,17 @@ ruma_api! {
 
     error: crate::Error
 }
+
+impl Request {
+    /// Creates an empty `Request`.
+    pub fn new() -> Self {
+        Self
+    }
+}
+
+impl Response {
+    /// Creates a `Response` with the given `versions`.
+    pub fn new(versions: Vec<String>) -> Self {
+        Self { versions, unstable_features: BTreeMap::new() }
+    }
+}