feat: Temporary cap bitcoin-da fee rate

bin/citrea/src/rollup/bitcoin.rs

@@ -141,8 +141,12 @@ impl RollupBlueprint for BitcoinRollup {
         );
         let monitoring_service = Arc::new(monitoring_service);
 
-        let fee_service =
-            FeeService::new(client.clone(), network, da_config.mempool_space_url.clone());
+        let fee_service = FeeService::new(
+            client.clone(),
+            network,
+            da_config.mempool_space_url.clone(),
+            da_config.max_fee_rate_sat_vb,
+        );
 
         let service = Arc::new(
             BitcoinService::from_config(

bin/citrea/tests/bitcoin/utils.rs

@@ -188,6 +188,7 @@ pub async fn spawn_bitcoin_da_service(
         utxo_selection_mode,
         rpc_timeout_secs: None,
         rpc_connect_timeout_secs: None,
+        max_fee_rate_sat_vb: None,
     };
 
     let (tx, rx) = tokio::sync::mpsc::unbounded_channel();
@@ -225,7 +226,12 @@ pub async fn spawn_bitcoin_da_service(
     );
     let monitoring_service = Arc::new(monitoring_service);
 
-    let fee_service = FeeService::new(client.clone(), network, da_config.mempool_space_url.clone());
+    let fee_service = FeeService::new(
+        client.clone(),
+        network,
+        da_config.mempool_space_url.clone(),
+        da_config.max_fee_rate_sat_vb,
+    );
 
     let service = Arc::new(
         BitcoinService::from_config(

crates/bitcoin-da/src/fee.rs

@@ -26,6 +26,8 @@ const BASE_FEE_RATE_MULTIPLIER: f64 = 1.0;
 const FEE_RATE_MULTIPLIER_FACTOR: f64 = 1.1;
 const MAX_FEE_RATE_MULTIPLIER: f64 = 2.0;
 
+const DEFAULT_MAX_FEE_RATE_SAT_VB: u64 = 15;
+
 /// Type alias for a Partially Signed Bitcoin Transaction (PSBT).
 pub type Psbt = String;
 
@@ -46,6 +48,7 @@ pub struct FeeService {
     client: Arc<Client>,
     network: Network,
     mempool_space_url: String,
+    max_fee_rate_sat_vb: u64,
 }
 
 impl FeeService {
@@ -54,13 +57,17 @@ impl FeeService {
         client: Arc<Client>,
         network: bitcoin::Network,
         mempool_space_url: Option<String>,
+        max_fee_rate_sat_vb: Option<u64>,
     ) -> Self {
         let mempool_space_url =
             mempool_space_url.unwrap_or_else(|| DEFAULT_MEMPOOL_SPACE_URL.to_string());
+
+        let max_fee_rate_sat_vb = max_fee_rate_sat_vb.unwrap_or(DEFAULT_MAX_FEE_RATE_SAT_VB);
         Self {
             client,
             network,
             mempool_space_url,
+            max_fee_rate_sat_vb,
         }
     }
 
@@ -97,10 +104,14 @@ impl FeeService {
                         .fee_rate
                 }
             };
+
         let sat_vkb = smart_fee.map_or(1000, |rate| rate.to_sat());
+        let sat_vb = sat_vkb / 1000;
+        let capped_fee_rate = sat_vb.min(self.max_fee_rate_sat_vb);
+
+        tracing::debug!("Fee rate: {capped_fee_rate} sat/vb");
 
-        tracing::debug!("Fee rate: {} sat/vb", sat_vkb / 1000);
-        Ok(sat_vkb / 1000)
+        Ok(capped_fee_rate)
     }
 
     /// Bump TX fee via cpfp.

crates/bitcoin-da/src/service.rs

@@ -124,6 +124,9 @@ pub struct BitcoinServiceConfig {
 
     /// Connection timeout for RPC in seconds
     pub rpc_connect_timeout_secs: Option<u64>,
+
+    /// Max fee rate in sat/vb
+    pub max_fee_rate_sat_vb: Option<u64>,
 }
 
 impl citrea_common::FromEnv for BitcoinServiceConfig {
@@ -149,6 +152,9 @@ impl citrea_common::FromEnv for BitcoinServiceConfig {
             rpc_connect_timeout_secs: read_env("BITCOIN_RPC_CONNECT_TIMEOUT_SECS")
                 .ok()
                 .and_then(|v| v.parse::<u64>().ok()),
+            max_fee_rate_sat_vb: read_env("BITCOIN_MAX_FEE_RATE_SAT_VB")
+                .ok()
+                .and_then(|v| v.parse::<u64>().ok()),
         })
     }
 }