diff --git a/crates/bin/pd/src/cli.rs b/crates/bin/pd/src/cli.rs
index 63bb65aa96..90f0111063 100644
--- a/crates/bin/pd/src/cli.rs
+++ b/crates/bin/pd/src/cli.rs
@@ -172,6 +172,13 @@ pub enum TestnetCommand {
         /// can be voted on.
         #[clap(long)]
         proposal_voting_blocks: Option<u64>,
+        /// The fixed gas price for all transactions on the network.
+        /// Described as "simple" because the single value will be reused
+        /// for all gas price types: block space, compact block space, verification, and execution.
+        /// The numeric value is one-thousandths of the staking token,
+        /// so `--gas-price-simple=1000` means all transactions will have a cost of 1penumbra.
+        #[clap(long)]
+        gas_price_simple: Option<u64>,
         /// Base hostname for a validator's p2p service. If multiple validators
         /// exist in the genesis, e.g. via `--validators-input-file`, then
         /// numeric suffixes are automatically added, e.g. "-0", "-1", etc.
diff --git a/crates/bin/pd/src/main.rs b/crates/bin/pd/src/main.rs
index 4fbfeaa91a..368d4066a3 100644
--- a/crates/bin/pd/src/main.rs
+++ b/crates/bin/pd/src/main.rs
@@ -305,6 +305,7 @@ async fn main() -> anyhow::Result<()> {
                     allocations_input_file,
                     validators_input_file,
                     chain_id,
+                    gas_price_simple,
                     preserve_chain_id,
                     external_addresses,
                     proposal_voting_blocks,
@@ -364,6 +365,7 @@ async fn main() -> anyhow::Result<()> {
                 epoch_duration,
                 unbonding_delay,
                 proposal_voting_blocks,
+                gas_price_simple,
             )?;
             tracing::info!(
                 n_validators = t.validators.len(),
diff --git a/crates/bin/pd/src/testnet/generate.rs b/crates/bin/pd/src/testnet/generate.rs
index d8585200f1..cc1d1a46e6 100644
--- a/crates/bin/pd/src/testnet/generate.rs
+++ b/crates/bin/pd/src/testnet/generate.rs
@@ -4,6 +4,7 @@
 use crate::testnet::config::{get_testnet_dir, TestnetTendermintConfig, ValidatorKeys};
 use anyhow::{Context, Result};
 use penumbra_app::params::AppParameters;
+use penumbra_fee::genesis::Content as FeeContent;
 use penumbra_governance::genesis::Content as GovernanceContent;
 use penumbra_keys::{keys::SpendKey, Address};
 use penumbra_sct::genesis::Content as SctContent;
@@ -69,6 +70,7 @@ impl TestnetConfig {
         epoch_duration: Option<u64>,
         unbonding_delay: Option<u64>,
         proposal_voting_blocks: Option<u64>,
+        gas_price_simple: Option<u64>,
     ) -> anyhow::Result<TestnetConfig> {
         let external_addresses = external_addresses.unwrap_or_default();
 
@@ -98,6 +100,7 @@ impl TestnetConfig {
             epoch_duration,
             unbonding_delay,
             proposal_voting_blocks,
+            gas_price_simple,
         )?;
         let genesis = Self::make_genesis(app_state)?;
 
@@ -186,6 +189,7 @@ impl TestnetConfig {
         epoch_duration: Option<u64>,
         unbonding_delay: Option<u64>,
         proposal_voting_blocks: Option<u64>,
+        gas_price_simple: Option<u64>,
     ) -> anyhow::Result<penumbra_app::genesis::Content> {
         let default_gov_params = penumbra_governance::params::GovernanceParameters::default();
 
@@ -198,6 +202,8 @@ impl TestnetConfig {
         // Look up default app params, so we can fill in defaults.
         let default_app_params = AppParameters::default();
 
+        let gas_price_simple = gas_price_simple.unwrap_or_default();
+
         let app_state = penumbra_app::genesis::Content {
             chain_id: chain_id.to_string(),
             stake_content: StakeContent {
@@ -210,6 +216,16 @@ impl TestnetConfig {
                     ..Default::default()
                 },
             },
+            fee_content: FeeContent {
+                fee_params: penumbra_fee::params::FeeParameters {
+                    fixed_gas_prices: penumbra_fee::GasPrices {
+                        block_space_price: gas_price_simple,
+                        compact_block_space_price: gas_price_simple,
+                        verification_price: gas_price_simple,
+                        execution_price: gas_price_simple,
+                    },
+                },
+            },
             governance_content: GovernanceContent {
                 governance_params: gov_params,
             },
@@ -349,6 +365,7 @@ pub fn testnet_generate(
     validators_input_file: Option<PathBuf>,
     allocations_input_file: Option<PathBuf>,
     proposal_voting_blocks: Option<u64>,
+    gas_price_simple: Option<u64>,
 ) -> anyhow::Result<()> {
     tracing::info!(?chain_id, "Generating network config");
     let t = TestnetConfig::generate(
@@ -363,6 +380,7 @@ pub fn testnet_generate(
         epoch_duration,
         unbonding_delay,
         proposal_voting_blocks,
+        gas_price_simple,
     )?;
     tracing::info!(
         n_validators = t.validators.len(),
@@ -668,6 +686,7 @@ mod tests {
             None,
             None,
             None,
+            None,
         )?;
         assert_eq!(testnet_config.name, "test-chain-1234");
         assert_eq!(testnet_config.genesis.validators.len(), 0);
@@ -697,6 +716,7 @@ mod tests {
             None,
             None,
             None,
+            None,
         )?;
         assert_eq!(testnet_config.name, "test-chain-4567");
         assert_eq!(testnet_config.genesis.validators.len(), 0);
diff --git a/deployments/scripts/smoke-test.sh b/deployments/scripts/smoke-test.sh
index 4473218351..b00d60d2c1 100755
--- a/deployments/scripts/smoke-test.sh
+++ b/deployments/scripts/smoke-test.sh
@@ -48,7 +48,7 @@ cargo build --quiet --release --bin pd
 echo "Generating testnet config..."
 EPOCH_DURATION="${EPOCH_DURATION:-50}"
 UNBONDING_DELAY="${UNBONDING_DELAY:-50}"
-cargo run --quiet --release --bin pd -- testnet generate --unbonding-delay "$UNBONDING_DELAY" --epoch-duration "$EPOCH_DURATION" --timeout-commit 500ms
+cargo run --quiet --release --bin pd -- testnet generate --unbonding-delay "$UNBONDING_DELAY" --epoch-duration "$EPOCH_DURATION" --timeout-commit 500ms --gas-price-simple 5
 
 echo "Starting CometBFT..."
 cometbft start --log_level=error --home "${HOME}/.penumbra/testnet_data/node0/cometbft" > "${SMOKE_LOG_DIR}/comet.log" &