diff --git a/main/src/cache.rs b/main/src/cache.rs
index b2798bd..d1a7694 100644
--- a/main/src/cache.rs
+++ b/main/src/cache.rs
@@ -11,9 +11,8 @@ use eyre::{bail, Result};
 use CacheManager::CacheManagerErrors;
 
 use crate::constants::ARB_WASM_CACHE_ADDRESS;
-use crate::deploy::gwei_to_wei;
 use crate::macros::greyln;
-use crate::{CacheBidConfig, CacheStatusConfig, CacheSuggestionsConfig};
+use crate::{CacheBidConfig, CacheStatusConfig, CacheSuggestionsConfig, GasFeeConfig};
 
 sol! {
     #[sol(rpc)]
@@ -178,8 +177,9 @@ pub async fn place_bid(cfg: &CacheBidConfig) -> Result<()> {
     let cache_manager = CacheManager::new(cache_manager_addr, provider.clone());
     let addr = cfg.address.to_fixed_bytes().into();
     let mut place_bid_call = cache_manager.placeBid(addr).value(U256::from(cfg.bid));
-    if let Some(max_fee) = cfg.max_fee_per_gas_gwei {
-        place_bid_call = place_bid_call.max_fee_per_gas(gwei_to_wei(max_fee)?);
+    if let Some(max_fee) = cfg.get_max_fee_per_gas_wei()? {
+        place_bid_call = place_bid_call.max_fee_per_gas(max_fee);
+        place_bid_call = place_bid_call.max_priority_fee_per_gas(0);
     };
 
     greyln!("Checking if contract can be cached...");
diff --git a/main/src/deploy/deployer.rs b/main/src/deploy/deployer.rs
index baa1825..55243e0 100644
--- a/main/src/deploy/deployer.rs
+++ b/main/src/deploy/deployer.rs
@@ -4,6 +4,7 @@
 use super::SignerClient;
 use crate::{
     check::ContractCheck,
+    deploy::calculate_fee_per_gas,
     macros::*,
     util::color::{Color, DebugColor, GREY},
     DeployConfig,
@@ -136,18 +137,23 @@ pub async fn deploy(
         .estimate_gas(&TypedTransaction::Eip1559(tx.clone()), None)
         .await
         .wrap_err("deployment failed during gas estimation")?;
+
+    let gas_price = client.get_gas_price().await?;
+
     if cfg.check_config.common_cfg.verbose || cfg.estimate_gas {
-        super::print_gas_estimate("deployer deploy, activate, and init", client, gas).await?;
+        super::print_gas_estimate("deployer deploy, activate, and init", gas, gas_price).await?;
     }
     if cfg.estimate_gas {
         return Ok(());
     }
 
+    let fee_per_gas = calculate_fee_per_gas(&cfg.check_config.common_cfg, gas_price)?;
+
     let receipt = super::run_tx(
         "deploy_activate_init",
         tx,
         Some(gas),
-        cfg.check_config.common_cfg.max_fee_per_gas_gwei,
+        fee_per_gas,
         client,
         cfg.check_config.common_cfg.verbose,
     )
diff --git a/main/src/deploy/mod.rs b/main/src/deploy/mod.rs
index 11cd9e6..c1441e1 100644
--- a/main/src/deploy/mod.rs
+++ b/main/src/deploy/mod.rs
@@ -11,7 +11,7 @@ use crate::{
         color::{Color, DebugColor},
         sys,
     },
-    DeployConfig,
+    DeployConfig, GasFeeConfig,
 };
 use alloy_primitives::{Address, U256 as AU256};
 use alloy_sol_macro::sol;
@@ -137,19 +137,23 @@ impl DeployConfig {
             .estimate_gas(&TypedTransaction::Eip1559(tx.clone()), None)
             .await?;
 
+        let gas_price = client.get_gas_price().await?;
+
         if self.check_config.common_cfg.verbose || self.estimate_gas {
-            print_gas_estimate("deployment", client, gas).await?;
+            print_gas_estimate("deployment", gas, gas_price).await?;
         }
         if self.estimate_gas {
             let nonce = client.get_transaction_count(sender, None).await?;
             return Ok(ethers::utils::get_contract_address(sender, nonce));
         }
 
+        let fee_per_gas = calculate_fee_per_gas(&self.check_config.common_cfg, gas_price)?;
+
         let receipt = run_tx(
             "deploy",
             tx,
             Some(gas),
-            self.check_config.common_cfg.max_fee_per_gas_gwei,
+            fee_per_gas,
             client,
             self.check_config.common_cfg.verbose,
         )
@@ -198,15 +202,19 @@ impl DeployConfig {
             .await
             .map_err(|e| eyre!("did not estimate correctly: {e}"))?;
 
+        let gas_price = client.get_gas_price().await?;
+
         if self.check_config.common_cfg.verbose || self.estimate_gas {
             greyln!("activation gas estimate: {}", format_gas(gas));
         }
 
+        let fee_per_gas = calculate_fee_per_gas(&self.check_config.common_cfg, gas_price)?;
+
         let receipt = run_tx(
             "activate",
             tx,
             Some(gas),
-            self.check_config.common_cfg.max_fee_per_gas_gwei,
+            fee_per_gas,
             client,
             self.check_config.common_cfg.verbose,
         )
@@ -224,8 +232,7 @@ impl DeployConfig {
     }
 }
 
-pub async fn print_gas_estimate(name: &str, client: &SignerClient, gas: U256) -> Result<()> {
-    let gas_price = client.get_gas_price().await?;
+pub async fn print_gas_estimate(name: &str, gas: U256, gas_price: U256) -> Result<()> {
     greyln!("estimates");
     greyln!("{} tx gas: {}", name, gas.debug_lavender());
     greyln!(
@@ -256,7 +263,7 @@ pub async fn run_tx(
     name: &str,
     tx: Eip1559TransactionRequest,
     gas: Option<U256>,
-    max_fee_per_gas_gwei: Option<u128>,
+    max_fee_per_gas_wei: u128,
     client: &SignerClient,
     verbose: bool,
 ) -> Result<TransactionReceipt> {
@@ -264,9 +271,10 @@ pub async fn run_tx(
     if let Some(gas) = gas {
         tx.gas = Some(gas);
     }
-    if let Some(max_fee) = max_fee_per_gas_gwei {
-        tx.max_fee_per_gas = Some(U256::from(gwei_to_wei(max_fee)?));
-    }
+
+    tx.max_fee_per_gas = Some(U256::from(max_fee_per_gas_wei));
+    tx.max_priority_fee_per_gas = Some(U256::from(0));
+
     let tx = TypedTransaction::Eip1559(tx);
     let tx = client.send_transaction(tx, None).await?;
     let tx_hash = tx.tx_hash();
@@ -329,10 +337,10 @@ pub fn format_gas(gas: U256) -> String {
     }
 }
 
-pub fn gwei_to_wei(gwei: u128) -> Result<u128> {
-    let wei_per_gwei: u128 = 10u128.pow(9);
-    match gwei.checked_mul(wei_per_gwei) {
-        Some(wei) => Ok(wei),
-        None => bail!("overflow occurred while converting gwei to wei"),
-    }
+pub fn calculate_fee_per_gas<T: GasFeeConfig>(config: &T, gas_price: U256) -> Result<u128> {
+    let fee_per_gas = match config.get_max_fee_per_gas_wei()? {
+        Some(wei) => wei,
+        None => gas_price.try_into().unwrap(),
+    };
+    Ok(fee_per_gas)
 }
diff --git a/main/src/main.rs b/main/src/main.rs
index 0d9bc8f..9c14ed9 100644
--- a/main/src/main.rs
+++ b/main/src/main.rs
@@ -125,7 +125,7 @@ struct CommonConfig {
     source_files_for_project_hash: Vec<String>,
     #[arg(long)]
     /// Optional max fee per gas in gwei units.
-    max_fee_per_gas_gwei: Option<u128>,
+    max_fee_per_gas_gwei: Option<String>,
     /// Specifies the features to use when building the Stylus binary.
     #[arg(long)]
     features: Option<String>,
@@ -161,7 +161,7 @@ pub struct CacheBidConfig {
     bid: u64,
     #[arg(long)]
     /// Optional max fee per gas in gwei units.
-    max_fee_per_gas_gwei: Option<u128>,
+    max_fee_per_gas_gwei: Option<String>,
 }
 
 #[derive(Args, Clone, Debug)]
@@ -395,6 +395,60 @@ impl fmt::Display for CommonConfig {
     }
 }
 
+pub trait GasFeeConfig {
+    fn get_max_fee_per_gas_wei(&self) -> Result<Option<u128>>;
+    fn get_fee_str(&self) -> &Option<String>;
+}
+
+fn convert_gwei_to_wei(fee_str: &str) -> Result<u128> {
+    let gwei = match fee_str.parse::<f64>() {
+        Ok(fee) if fee >= 0.0 => fee,
+        Ok(_) => bail!("Max fee per gas must be non-negative"),
+        Err(_) => bail!("Invalid max fee per gas value: {}", fee_str),
+    };
+
+    if !gwei.is_finite() {
+        bail!("Invalid gwei value: must be finite");
+    }
+
+    let wei = gwei * 1e9;
+    if !wei.is_finite() {
+        bail!("Overflow occurred in floating point multiplication of --max-fee-per-gas-gwei converting");
+    }
+
+    if wei < 0.0 || wei >= u128::MAX as f64 {
+        bail!("Result outside valid range for wei");
+    }
+
+    Ok(wei as u128)
+}
+
+impl GasFeeConfig for CommonConfig {
+    fn get_fee_str(&self) -> &Option<String> {
+        &self.max_fee_per_gas_gwei
+    }
+
+    fn get_max_fee_per_gas_wei(&self) -> Result<Option<u128>> {
+        match self.get_fee_str() {
+            Some(fee_str) => Ok(Some(convert_gwei_to_wei(fee_str)?)),
+            None => Ok(None),
+        }
+    }
+}
+
+impl GasFeeConfig for CacheBidConfig {
+    fn get_fee_str(&self) -> &Option<String> {
+        &self.max_fee_per_gas_gwei
+    }
+
+    fn get_max_fee_per_gas_wei(&self) -> Result<Option<u128>> {
+        match self.get_fee_str() {
+            Some(fee_str) => Ok(Some(convert_gwei_to_wei(fee_str)?)),
+            None => Ok(None),
+        }
+    }
+}
+
 impl fmt::Display for CheckConfig {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
         write!(