diff --git a/src/ws/sub_structs.rs b/src/ws/sub_structs.rs
index 4c3c94e5..53d13547 100644
--- a/src/ws/sub_structs.rs
+++ b/src/ws/sub_structs.rs
@@ -332,6 +332,10 @@ pub struct SpotAssetCtx {
     #[serde(flatten)]
     pub shared: SharedAssetCtx,
     pub circulating_supply: String,
+    #[serde(default)]
+    pub total_supply: Option<String>,
+    #[serde(default)]
+    pub day_base_vlm: Option<String>,
 }
 
 #[derive(Deserialize, Serialize, Clone, Debug)]
diff --git a/src/ws/ws_manager.rs b/src/ws/ws_manager.rs
index 4035baf3..e48b8c3c 100755
--- a/src/ws/ws_manager.rs
+++ b/src/ws/ws_manager.rs
@@ -495,3 +495,85 @@ impl Drop for WsManager {
         self.stop_flag.store(true, Ordering::Relaxed);
     }
 }
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn active_spot_asset_ctx_deserializes_and_maps_identifier() {
+        let json = r#"{
+            "channel": "activeSpotAssetCtx",
+            "data": {
+                "coin": "@107",
+                "ctx": {
+                    "prevDayPx": "23.993",
+                    "dayNtlVlm": "228614808.04913011",
+                    "markPx": "23.277",
+                    "midPx": "23.281",
+                    "circulatingSupply": "334395529.28086698",
+                    "coin": "@107",
+                    "totalSupply": "999840322.48575342",
+                    "dayBaseVlm": "9756716.93999999"
+                }
+            }
+        }"#;
+
+        let msg: Message = serde_json::from_str(json).expect("sample activeSpotAssetCtx JSON");
+        match &msg {
+            Message::ActiveSpotAssetCtx(spot) => {
+                assert_eq!(spot.data.coin, "@107");
+                assert_eq!(
+                    spot.data.ctx.total_supply.as_deref(),
+                    Some("999840322.48575342")
+                );
+                assert_eq!(
+                    spot.data.ctx.day_base_vlm.as_deref(),
+                    Some("9756716.93999999")
+                );
+            }
+            other => panic!("expected ActiveSpotAssetCtx, got {other:?}"),
+        }
+
+        assert_eq!(
+            WsManager::get_identifier(&msg).unwrap(),
+            serde_json::to_string(&Subscription::ActiveAssetCtx {
+                coin: "@107".into()
+            })
+            .unwrap()
+        );
+    }
+
+    #[test]
+    fn active_asset_ctx_perps_maps_identifier() {
+        let json = r#"{
+            "channel": "activeAssetCtx",
+            "data": {
+                "coin": "BTC",
+                "ctx": {
+                    "funding": "0.0001",
+                    "openInterest": "1000.0",
+                    "oraclePx": "50000.0",
+                    "dayNtlVlm": "1.0",
+                    "prevDayPx": "49000.0",
+                    "markPx": "50000.0",
+                    "midPx": "50000.0"
+                }
+            }
+        }"#;
+
+        let msg: Message = serde_json::from_str(json).expect("minimal perps activeAssetCtx JSON");
+        match &msg {
+            Message::ActiveAssetCtx(_) => {}
+            other => panic!("expected ActiveAssetCtx, got {other:?}"),
+        }
+
+        assert_eq!(
+            WsManager::get_identifier(&msg).unwrap(),
+            serde_json::to_string(&Subscription::ActiveAssetCtx {
+                coin: "BTC".into()
+            })
+            .unwrap()
+        );
+    }
+}