diff --git a/README.md b/README.md
index 8a9396f..dab9734 100644
--- a/README.md
+++ b/README.md
@@ -69,6 +69,7 @@ async fn main() -> Result<(), Box<dyn std::error::Error>> {
     let cfg = TestConfig::from_file("testfile.toml")?;
     let mut agents = AgentStore::new();
     let rand_seed = RandSeed::new();
+    let legacy = false;
     agents.add_random_agent(
         "agentName",
         4, // number of random signers to create
@@ -88,7 +89,8 @@ async fn main() -> Result<(), Box<dyn std::error::Error>> {
         .iter()
         .map(|s| s.parse::<_>().unwrap())
         .collect::<Vec<_>>(),
-        agents
+        agents,
+        legacy,
     );
 
     if db.get_named_tx("MyContract").is_err() {
diff --git a/crates/cli/src/commands.rs b/crates/cli/src/commands.rs
index 0687ded..2883ed4 100644
--- a/crates/cli/src/commands.rs
+++ b/crates/cli/src/commands.rs
@@ -90,6 +90,13 @@ May be specified multiple times."
             default_value = "1.0"
         )]
         min_balance: String,
+
+        /// Whether to send legacy transactions.
+        #[arg(
+            long,
+            long_help = "If set, will send legacy Ethereum transactions instead of EIP-1559 transactions."
+        )]
+        legacy: bool,
     },
 
     #[command(
@@ -119,6 +126,13 @@ May be specified multiple times."
             default_value = "1.0"
         )]
         min_balance: String,
+
+        /// Whether to send legacy transactions.
+        #[arg(
+            long,
+            long_help = "If set, will send legacy Ethereum transactions instead of EIP-1559 transactions."
+        )]
+        legacy: bool,
     },
 
     #[command(
diff --git a/crates/cli/src/main.rs b/crates/cli/src/main.rs
index c898a92..3a989f0 100644
--- a/crates/cli/src/main.rs
+++ b/crates/cli/src/main.rs
@@ -46,6 +46,7 @@ async fn main() -> Result<(), Box<dyn std::error::Error>> {
             rpc_url,
             private_keys,
             min_balance,
+            legacy,
         } => {
             let url = Url::parse(rpc_url.as_ref()).expect("Invalid RPC URL");
             let rpc_client = ProviderBuilder::new()
@@ -83,6 +84,7 @@ async fn main() -> Result<(), Box<dyn std::error::Error>> {
                 RandSeed::new(),
                 &signers,
                 Default::default(),
+                legacy,
             )
             .await?;
 
@@ -101,6 +103,7 @@ async fn main() -> Result<(), Box<dyn std::error::Error>> {
             private_keys,
             disable_reports,
             min_balance,
+            legacy,
         } => {
             let testconfig = TestConfig::from_file(&testfile)?;
             let rand_seed = seed
@@ -228,6 +231,7 @@ async fn main() -> Result<(), Box<dyn std::error::Error>> {
                 rand_seed,
                 &user_signers,
                 agents,
+                legacy,
             )
             .await?;
 
diff --git a/crates/core/src/spammer/blockwise.rs b/crates/core/src/spammer/blockwise.rs
index e3a1b19..eccb064 100644
--- a/crates/core/src/spammer/blockwise.rs
+++ b/crates/core/src/spammer/blockwise.rs
@@ -74,6 +74,7 @@ mod tests {
             seed,
             get_test_signers().as_slice(),
             AgentStore::new(),
+            false,
         )
         .await
         .unwrap();
diff --git a/crates/core/src/test_scenario.rs b/crates/core/src/test_scenario.rs
index a41d679..2b0ddc5 100644
--- a/crates/core/src/test_scenario.rs
+++ b/crates/core/src/test_scenario.rs
@@ -45,6 +45,8 @@ where
     pub chain_id: u64,
     pub gas_limits: HashMap<FixedBytes<4>, u128>,
     pub msg_handle: Arc<TxActorHandle>,
+    /// Whether to send legacy transactions instead of EIP-1559 transactions
+    pub legacy: bool,
 }
 
 impl<D, S, P> TestScenario<D, S, P>
@@ -61,6 +63,7 @@ where
         rand_seed: S,
         signers: &[PrivateKeySigner],
         agent_store: AgentStore,
+        legacy: bool,
     ) -> Result<Self> {
         let rpc_client = Arc::new(
             ProviderBuilder::new()
@@ -120,6 +123,7 @@ where
             nonces,
             gas_limits,
             msg_handle,
+            legacy,
         })
     }
 
@@ -320,10 +324,20 @@ where
         let full_tx = tx_req
             .to_owned()
             .with_nonce(nonce)
-            .with_max_fee_per_gas(gas_price + (gas_price / 5))
-            .with_max_priority_fee_per_gas(gas_price)
             .with_chain_id(self.chain_id)
-            .with_gas_limit(gas_limit + (gas_limit / 6));
+            .with_gas_limit(if self.legacy {
+                gas_limit
+            } else {
+                gas_limit + (gas_limit / 6)
+            });
+
+        let full_tx = if self.legacy {
+            full_tx.with_gas_price(gas_price)
+        } else {
+            full_tx
+                .with_max_fee_per_gas(gas_price + (gas_price / 5))
+                .with_max_priority_fee_per_gas(gas_price)
+        };
 
         Ok((full_tx, signer))
     }
@@ -721,6 +735,7 @@ pub mod tests {
             seed.to_owned(),
             signers,
             AgentStore::new(),
+            false,
         )
         .await
         .unwrap()
diff --git a/crates/testfile/src/lib.rs b/crates/testfile/src/lib.rs
index efa56c4..de70ae8 100644
--- a/crates/testfile/src/lib.rs
+++ b/crates/testfile/src/lib.rs
@@ -381,6 +381,7 @@ pub mod tests {
             seed,
             &get_test_signers(),
             Default::default(),
+            false,
         )
         .await
         .unwrap();
@@ -421,6 +422,7 @@ pub mod tests {
             seed.to_owned(),
             &signers,
             Default::default(),
+            false,
         )
         .await
         .unwrap();
@@ -432,6 +434,7 @@ pub mod tests {
             seed,
             &signers,
             Default::default(),
+            false,
         )
         .await
         .unwrap();