diff --git a/src/caller/mod.rs b/src/caller/mod.rs
index f37aea0..214dbaa 100644
--- a/src/caller/mod.rs
+++ b/src/caller/mod.rs
@@ -33,6 +33,8 @@ pub mod endpoints {
         "/api/v1/schedule/message/event/response/record";
     /// Constant for getting Message Event Response endpoint
     pub const GET_MESSAGE_EVENT_RESPONSE: &str = "/api/v1/schedule/message/event/response";
+    /// Constant for sending a message instantly. No scheduling
+    pub const INSTANT_MESSAGE: &str = "/api/v1/instant/message";
 }
 
 pub mod response {