diff --git a/backend/rust-gbt/src/thread_acceleration.rs b/backend/rust-gbt/src/thread_acceleration.rs
new file mode 100644
index 000000000..618cac3db
--- /dev/null
+++ b/backend/rust-gbt/src/thread_acceleration.rs
@@ -0,0 +1,8 @@
+use napi_derive::napi;
+
+#[derive(Debug)]
+#[napi(object)]
+pub struct ThreadAcceleration {
+    pub uid: u32,
+    pub delta: f64, // fee delta
+}