diff --git a/crates/sim/src/gas/gas.rs b/crates/sim/src/gas/gas.rs
index edbc257c5..a1ed0f923 100644
--- a/crates/sim/src/gas/gas.rs
+++ b/crates/sim/src/gas/gas.rs
@@ -13,7 +13,7 @@ use rundler_types::{
 use rundler_utils::math;
 use tokio::try_join;
 
-use super::polygon::Polygon;
+use super::polygon::{Polygon, MAINNET_MAX_PRIORITY_FEE_DEFAULT, MUMBAI_MAX_PRIORITY_FEE_DEFAULT};
 
 // Gas overheads for user operations
 // used in calculating the pre-verification gas
@@ -275,6 +275,16 @@ impl<P: Provider> FeeEstimator<P> {
             let gas_oracle = Polygon::new(Arc::clone(&self.provider)).category(GasCategory::Fast);
 
             let fees = gas_oracle.estimate_eip1559_fees().await?;
+
+            if fees.1.is_zero() {
+                let fallback = match self.chain_id {
+                    x if x == Chain::Polygon as u64 => MAINNET_MAX_PRIORITY_FEE_DEFAULT,
+                    x if x == Chain::PolygonMumbai as u64 => MUMBAI_MAX_PRIORITY_FEE_DEFAULT,
+                    _ => 0,
+                };
+                return Ok(fallback.into());
+            }
+
             Ok(fees.1)
         } else if self.use_bundle_priority_fee {
             self.provider.get_max_priority_fee().await
diff --git a/crates/sim/src/gas/polygon.rs b/crates/sim/src/gas/polygon.rs
index 1d6757bf2..7f59aad0e 100644
--- a/crates/sim/src/gas/polygon.rs
+++ b/crates/sim/src/gas/polygon.rs
@@ -8,6 +8,9 @@ use ethers::{
 use rundler_provider::Provider;
 use serde::Deserialize;
 
+pub(crate) const MUMBAI_MAX_PRIORITY_FEE_DEFAULT: u64 = 1_500_000_000;
+pub(crate) const MAINNET_MAX_PRIORITY_FEE_DEFAULT: u64 = 30_000_000_000;
+
 #[derive(Debug)]
 pub(crate) struct Polygon<P> {
     provider: Arc<P>,