diff --git a/src/main/kotlin/com/nylas/models/ListMessagesQueryParams.kt b/src/main/kotlin/com/nylas/models/ListMessagesQueryParams.kt
index 2f1f75df..2768ac07 100644
--- a/src/main/kotlin/com/nylas/models/ListMessagesQueryParams.kt
+++ b/src/main/kotlin/com/nylas/models/ListMessagesQueryParams.kt
@@ -94,6 +94,11 @@ data class ListMessagesQueryParams(
    */
   @Json(name = "search_query_native")
   val searchQueryNative: String? = null,
+  /**
+   * Pass in your metadata key and value pair to search for metadata.
+   */
+  @Json(name = "metadata_pair")
+  val metadataPair: Map<String, String>? = null,
 ) : IQueryParams {
   class Builder {
     private var limit: Int? = null
@@ -113,6 +118,7 @@ data class ListMessagesQueryParams(
     private var hasAttachment: Boolean? = null
     private var fields: MessageFields? = null
     private var searchQueryNative: String? = null
+    private var metadataPair: Map<String, String>? = null
 
     /**
      * Sets the maximum number of objects to return.
@@ -236,6 +242,13 @@ data class ListMessagesQueryParams(
      */
     fun searchQueryNative(searchQueryNative: String?) = apply { this.searchQueryNative = searchQueryNative }
 
+    /**
+     * Set the metadata key and value pair to search for metadata.
+     * @param metadataPair The metadata key and value pair to search for metadata.
+     * @return The builder
+     */
+    fun metadataPair(metadataPair: Map<String, String>?) = apply { this.metadataPair = metadataPair }
+
     /**
      * Builds the [ListMessagesQueryParams] object.
      * @return The [ListMessagesQueryParams] object.
@@ -258,6 +271,7 @@ data class ListMessagesQueryParams(
       hasAttachment = hasAttachment,
       fields = fields,
       searchQueryNative = searchQueryNative,
+      metadataPair = metadataPair,
     )
   }
 }
diff --git a/src/test/kotlin/com/nylas/resources/MessagesTests.kt b/src/test/kotlin/com/nylas/resources/MessagesTests.kt
index 9efe3052..9b0b6fd7 100644
--- a/src/test/kotlin/com/nylas/resources/MessagesTests.kt
+++ b/src/test/kotlin/com/nylas/resources/MessagesTests.kt
@@ -288,6 +288,31 @@ class MessagesTests {
       assertEquals(queryParams, queryParamCaptor.firstValue)
     }
 
+    @Test
+    fun `listing messages with metadata_pair calls requests with the correct params`() {
+      val queryParams =
+        ListMessagesQueryParams(
+          metadataPair = mapOf("campaign" to "welcome-email"),
+        )
+
+      messages.list(grantId, queryParams)
+
+      val pathCaptor = argumentCaptor<String>()
+      val typeCaptor = argumentCaptor<Type>()
+      val queryParamCaptor = argumentCaptor<IQueryParams>()
+      val overrideParamCaptor = argumentCaptor<RequestOverrides>()
+      verify(mockNylasClient).executeGet<ListResponse<Message>>(
+        pathCaptor.capture(),
+        typeCaptor.capture(),
+        queryParamCaptor.capture(),
+        overrideParamCaptor.capture(),
+      )
+
+      assertEquals("v3/grants/$grantId/messages", pathCaptor.firstValue)
+      assertEquals(Types.newParameterizedType(ListResponse::class.java, Message::class.java), typeCaptor.firstValue)
+      assertEquals(queryParams, queryParamCaptor.firstValue)
+    }
+
     @Test
     fun `listing messages without query params calls requests with the correct params`() {
       messages.list(grantId)