diff --git a/crates/ruma-identity-service-api/src/association.rs b/crates/ruma-identity-service-api/src/association.rs
index 69121888..13fd38b2 100644
--- a/crates/ruma-identity-service-api/src/association.rs
+++ b/crates/ruma-identity-service-api/src/association.rs
@@ -1,4 +1,5 @@
 //! Endpoints to create associations with a Matrix ID on the identity server.
 
+pub mod check_3pid_validity;
 pub mod email;
 pub mod msisdn;
diff --git a/crates/ruma-identity-service-api/src/association/check_3pid_validity.rs b/crates/ruma-identity-service-api/src/association/check_3pid_validity.rs
new file mode 100644
index 00000000..b87c57a5
--- /dev/null
+++ b/crates/ruma-identity-service-api/src/association/check_3pid_validity.rs
@@ -0,0 +1,3 @@
+//! Endpoint to determine the validity of a 3PID.
+
+pub mod v2;
diff --git a/crates/ruma-identity-service-api/src/association/check_3pid_validity/v2.rs b/crates/ruma-identity-service-api/src/association/check_3pid_validity/v2.rs
new file mode 100644
index 00000000..b682eed0
--- /dev/null
+++ b/crates/ruma-identity-service-api/src/association/check_3pid_validity/v2.rs
@@ -0,0 +1,53 @@
+//! [GET /_matrix/identity/v2/3pid/getValidated3pid](https://matrix.org/docs/spec/identity_service/r0.3.0#get-matrix-identity-v2-3pid-getvalidated3pid)
+
+use js_int::UInt;
+use ruma_api::ruma_api;
+use ruma_common::thirdparty::Medium;
+
+ruma_api! {
+    metadata: {
+        description: "Determines if a given 3PID has been validated by a user.",
+        method: GET,
+        name: "check_3pid_validity",
+        path: "/_matrix/identity/v2/3pid/getValidated3pid/",
+        rate_limited: false,
+        authentication: AccessToken,
+    }
+
+    request: {
+        /// The Session ID generated by the `requestToken` call.
+        #[ruma_api(query)]
+        pub sid: &'a str,
+
+        /// The client secret passed to the `requestToken` call.
+        #[ruma_api(query)]
+        pub client_secret: &'a str,
+
+    }
+
+    response: {
+        /// The medium type of the 3PID.
+        pub medium: Medium,
+
+        /// The address of the 3PID being looked up.
+        pub address: String,
+
+        /// Timestamp, in milliseconds, indicating the time that the 3PID was validated.
+        pub validated_at: UInt,
+    }
+
+}
+
+impl<'a> Request<'a> {
+    /// Creates a `Request` with the given Session ID and client secret.
+    pub fn new(sid: &'a str, client_secret: &'a str) -> Self {
+        Self { sid, client_secret }
+    }
+}
+
+impl Response {
+    /// Creates a `Response` with the given medium, address and validation timestamp.
+    pub fn new(medium: Medium, address: String, validated_at: UInt) -> Self {
+        Self { medium, address, validated_at }
+    }
+}