From d115291784693b17fb36acec5323500f16f4b2b2 Mon Sep 17 00:00:00 2001
From: Aliaksandr Tsurko <ales@opentensor.dev>
Date: Wed, 2 Apr 2025 18:08:37 +0200
Subject: [PATCH] Setup default fee rate

---
 pallets/swap/src/pallet/impls.rs |  2 +-
 pallets/swap/src/pallet/mod.rs   | 10 +++++++---
 2 files changed, 8 insertions(+), 4 deletions(-)

diff --git a/pallets/swap/src/pallet/impls.rs b/pallets/swap/src/pallet/impls.rs
index 7df902f4ff..72d4b6be88 100644
--- a/pallets/swap/src/pallet/impls.rs
+++ b/pallets/swap/src/pallet/impls.rs
@@ -1345,7 +1345,7 @@ mod tests {
 
                         // Expected fee amount
                         let fee_rate = FeeRate::<Test>::get(netuid) as f64 / u16::MAX as f64;
-                        let expected_fee = output_amount * fee_rate as u64;
+                        let expected_fee = (output_amount as f64 * fee_rate) as u64;
 
                         // Global fees should be updated
                         let actual_global_fee = match order_type {
diff --git a/pallets/swap/src/pallet/mod.rs b/pallets/swap/src/pallet/mod.rs
index 2a6b3e2ebf..d4cbcbefc6 100644
--- a/pallets/swap/src/pallet/mod.rs
+++ b/pallets/swap/src/pallet/mod.rs
@@ -59,11 +59,15 @@ mod pallet {
         type MaxSqrtPrice: Get<SqrtPrice>;
     }
 
+    /// Default fee rate if not set
+    #[pallet::type_value]
+    pub fn DefaultFeeRate() -> u16 {
+        196 // 0.3 %
+    }
+
     /// The fee rate applied to swaps per subnet, normalized value between 0 and u16::MAX
-    ///
-    /// For example, 0.3% is approximately 196
     #[pallet::storage]
-    pub type FeeRate<T> = StorageMap<_, Twox64Concat, NetUid, u16, ValueQuery>;
+    pub type FeeRate<T> = StorageMap<_, Twox64Concat, NetUid, u16, ValueQuery, DefaultFeeRate>;
 
     // Global accrued fees in tao per subnet
     #[pallet::storage]