diff --git a/Cargo.toml b/Cargo.toml
index 1c7c2d0..51868eb 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -15,6 +15,7 @@ parallel = ["penumbra-wallet/parallel"]
 # Penumbra dependencies
 penumbra-proto = { path = "../penumbra/crates/proto", features = ["rpc", "box-grpc"] }
 penumbra-asset = { path = "../penumbra/crates/core/asset" }
+penumbra-fee = { path = "../penumbra/crates/core/component/fee" }
 penumbra-keys = { path = "../penumbra/crates/core/keys" }
 penumbra-custody = { path = "../penumbra/crates/custody" }
 penumbra-wallet = { path = "../penumbra/crates/wallet" }
diff --git a/src/opt/serve.rs b/src/opt/serve.rs
index ab9c537..b0a9288 100644
--- a/src/opt/serve.rs
+++ b/src/opt/serve.rs
@@ -6,6 +6,7 @@ use futures_util::{stream::StreamExt, stream::TryStreamExt};
 use num_traits::identities::Zero;
 use penumbra_asset::Value;
 use penumbra_custody::soft_kms::SoftKms;
+use penumbra_fee::FeeTier;
 use penumbra_proto::{
     custody::v1::{
         custody_service_client::CustodyServiceClient, custody_service_server::CustodyServiceServer,
@@ -27,9 +28,9 @@ use crate::{
 
 #[derive(Debug, Clone, Parser)]
 pub struct Serve {
-    /// The transaction fee for each response (paid in upenumbra).
-    #[structopt(long, default_value = "0")]
-    fee: u64,
+    /// The level of gas prices to pay on send transactions. Defaults to "low".
+    #[structopt(long, default_value_t)]
+    fee_tier: FeeTier,
     /// Per-user rate limit (e.g. "10m" or "1day").
     #[clap(short, long, default_value = "1day", parse(try_from_str = humantime::parse_duration))]
     rate_limit: Duration,