diff --git a/crates/primitives/src/basefee.rs b/crates/primitives/src/basefee.rs
index b886b41e929..0bafb9c8977 100644
--- a/crates/primitives/src/basefee.rs
+++ b/crates/primitives/src/basefee.rs
@@ -9,7 +9,9 @@ mod tests {
     use super::*;
 
     #[cfg(feature = "optimism")]
-    use crate::chain::{OP_BASE_FEE_PARAMS, OP_SEPOLIA_BASE_FEE_PARAMS};
+    use crate::chain::{
+        BASE_SEPOLIA_BASE_FEE_PARAMS, OP_BASE_FEE_PARAMS, OP_SEPOLIA_BASE_FEE_PARAMS,
+    };
 
     #[test]
     fn calculate_base_fee_success() {
@@ -92,7 +94,7 @@ mod tests {
             18000000, 18000000,
         ];
         let next_base_fee = [
-            1180000000, 1146666666, 1122857142, 1244299375, 1189416692, 1028254188, 1144836295, 1,
+            1100000048, 1080000000, 1065714297, 1167067046, 1128881311, 1028254188, 1098203452, 1,
             2, 3,
         ];
 
@@ -108,4 +110,37 @@ mod tests {
             );
         }
     }
+
+    #[cfg(feature = "optimism")]
+    #[test]
+    fn calculate_base_sepolia_base_fee_success() {
+        let base_fee = [
+            1000000000, 1000000000, 1000000000, 1072671875, 1059263476, 1049238967, 1049238967, 0,
+            1, 2,
+        ];
+        let gas_used = [
+            10000000, 10000000, 10000000, 9000000, 10001000, 0, 10000000, 10000000, 10000000,
+            10000000,
+        ];
+        let gas_limit = [
+            10000000, 12000000, 14000000, 10000000, 14000000, 2000000, 18000000, 18000000,
+            18000000, 18000000,
+        ];
+        let next_base_fee = [
+            1180000000, 1146666666, 1122857142, 1244299375, 1189416692, 1028254188, 1144836295, 1,
+            2, 3,
+        ];
+
+        for i in 0..base_fee.len() {
+            assert_eq!(
+                next_base_fee[i],
+                calc_next_block_base_fee(
+                    gas_used[i] as u128,
+                    gas_limit[i] as u128,
+                    base_fee[i] as u128,
+                    BASE_SEPOLIA_BASE_FEE_PARAMS,
+                ) as u64
+            );
+        }
+    }
 }
diff --git a/crates/primitives/src/chain/mod.rs b/crates/primitives/src/chain/mod.rs
index 727abe03811..41de1c45021 100644
--- a/crates/primitives/src/chain/mod.rs
+++ b/crates/primitives/src/chain/mod.rs
@@ -10,7 +10,9 @@ pub use spec::{BASE_MAINNET, BASE_SEPOLIA, OP_MAINNET, OP_SEPOLIA};
 
 #[cfg(feature = "optimism")]
 #[cfg(test)]
-pub(crate) use spec::{OP_BASE_FEE_PARAMS, OP_SEPOLIA_BASE_FEE_PARAMS};
+pub(crate) use spec::{
+    BASE_SEPOLIA_BASE_FEE_PARAMS, OP_BASE_FEE_PARAMS, OP_SEPOLIA_BASE_FEE_PARAMS,
+};
 
 // The chain spec module.
 mod spec;
diff --git a/crates/primitives/src/chain/spec.rs b/crates/primitives/src/chain/spec.rs
index 6d9cb9e56e9..5bdc5d9c22a 100644
--- a/crates/primitives/src/chain/spec.rs
+++ b/crates/primitives/src/chain/spec.rs
@@ -24,8 +24,8 @@ pub use alloy_eips::eip1559::BaseFeeParams;
 #[cfg(feature = "optimism")]
 pub(crate) use crate::{
     constants::{
-        OP_BASE_FEE_PARAMS, OP_CANYON_BASE_FEE_PARAMS, OP_SEPOLIA_BASE_FEE_PARAMS,
-        OP_SEPOLIA_CANYON_BASE_FEE_PARAMS,
+        BASE_SEPOLIA_BASE_FEE_PARAMS, BASE_SEPOLIA_CANYON_BASE_FEE_PARAMS, OP_BASE_FEE_PARAMS,
+        OP_CANYON_BASE_FEE_PARAMS, OP_SEPOLIA_BASE_FEE_PARAMS, OP_SEPOLIA_CANYON_BASE_FEE_PARAMS,
     },
     net::{base_nodes, base_testnet_nodes, op_nodes, op_testnet_nodes},
 };
@@ -397,8 +397,8 @@ pub static BASE_SEPOLIA: Lazy<Arc<ChainSpec>> = Lazy::new(|| {
         ]),
         base_fee_params: BaseFeeParamsKind::Variable(
             vec![
-                (Hardfork::London, OP_SEPOLIA_BASE_FEE_PARAMS),
-                (Hardfork::Canyon, OP_SEPOLIA_CANYON_BASE_FEE_PARAMS),
+                (Hardfork::London, BASE_SEPOLIA_BASE_FEE_PARAMS),
+                (Hardfork::Canyon, BASE_SEPOLIA_CANYON_BASE_FEE_PARAMS),
             ]
             .into(),
         ),
diff --git a/crates/primitives/src/constants/mod.rs b/crates/primitives/src/constants/mod.rs
index f4a1e24dcac..be8ca1564b0 100644
--- a/crates/primitives/src/constants/mod.rs
+++ b/crates/primitives/src/constants/mod.rs
@@ -103,7 +103,26 @@ pub const OP_SEPOLIA_EIP1559_BASE_FEE_MAX_CHANGE_DENOMINATOR_CANYON: u128 = 250;
 /// Base fee max change denominator for Optimism Sepolia as defined in the Optimism
 /// [transaction costs](https://community.optimism.io/docs/developers/build/differences/#transaction-costs) doc.
 #[cfg(feature = "optimism")]
-pub const OP_SEPOLIA_EIP1559_DEFAULT_ELASTICITY_MULTIPLIER: u128 = 10;
+pub const OP_SEPOLIA_EIP1559_DEFAULT_ELASTICITY_MULTIPLIER: u128 = 6;
+
+/// Base fee max change denominator for Base Sepolia as defined in the Optimism
+/// [transaction costs](https://community.optimism.io/docs/developers/build/differences/#transaction-costs) doc.
+#[cfg(feature = "optimism")]
+pub const BASE_SEPOLIA_EIP1559_DEFAULT_ELASTICITY_MULTIPLIER: u128 = 10;
+
+/// Get the base fee parameters for Base Sepolia.
+#[cfg(feature = "optimism")]
+pub const BASE_SEPOLIA_BASE_FEE_PARAMS: BaseFeeParams = BaseFeeParams {
+    max_change_denominator: OP_SEPOLIA_EIP1559_DEFAULT_BASE_FEE_MAX_CHANGE_DENOMINATOR,
+    elasticity_multiplier: BASE_SEPOLIA_EIP1559_DEFAULT_ELASTICITY_MULTIPLIER,
+};
+
+/// Get the base fee parameters for Base Sepolia (post Canyon).
+#[cfg(feature = "optimism")]
+pub const BASE_SEPOLIA_CANYON_BASE_FEE_PARAMS: BaseFeeParams = BaseFeeParams {
+    max_change_denominator: OP_SEPOLIA_EIP1559_BASE_FEE_MAX_CHANGE_DENOMINATOR_CANYON,
+    elasticity_multiplier: BASE_SEPOLIA_EIP1559_DEFAULT_ELASTICITY_MULTIPLIER,
+};
 
 /// Get the base fee parameters for Optimism Sepolia.
 #[cfg(feature = "optimism")]