diff --git a/zcash_client_memory/src/types/mod.rs b/zcash_client_memory/src/types/mod.rs
index 1a2e35a042..7d5a9035b7 100644
--- a/zcash_client_memory/src/types/mod.rs
+++ b/zcash_client_memory/src/types/mod.rs
@@ -12,3 +12,6 @@ pub(crate) use notes::*;
 pub(crate) use nullifier::*;
 
 pub(crate) use transaction::*;
+
+pub(crate) mod transparent;
+pub(crate) use transparent::*;
diff --git a/zcash_client_memory/src/types/serialization/mod.rs b/zcash_client_memory/src/types/serialization/mod.rs
index 8dcc1c80f8..127ffa7ff3 100644
--- a/zcash_client_memory/src/types/serialization/mod.rs
+++ b/zcash_client_memory/src/types/serialization/mod.rs
@@ -18,6 +18,9 @@ pub use memo::*;
 pub use array::*;
 pub use bytes::*;
 
+mod transparent;
+pub use transparent::*;
+
 impl ToArray<u8, 32> for BlockHash {
     fn to_array(&self) -> [u8; 32] {
         self.0
diff --git a/zcash_client_memory/src/types/serialization/transaction.rs b/zcash_client_memory/src/types/serialization/transaction.rs
index 506b85ed3f..249b558dc8 100644
--- a/zcash_client_memory/src/types/serialization/transaction.rs
+++ b/zcash_client_memory/src/types/serialization/transaction.rs
@@ -1,13 +1,15 @@
-use serde::{Deserialize, Serialize};
+use serde::{Deserialize, Deserializer, Serialize};
 
-use serde_with::serde_as;
-
-use serde_with::FromInto;
-
-use zcash_primitives::transaction::TxId;
+use serde_with::{serde_as, TryFromInto};
+use serde_with::{DeserializeAs, SerializeAs};
 
 use super::FromArray;
 use super::ToArray;
+use serde_with::FromInto;
+use zcash_primitives::legacy::Script;
+use zcash_primitives::transaction::components::amount::NonNegativeAmount;
+use zcash_primitives::transaction::components::TxOut;
+use zcash_primitives::transaction::TxId;
 
 impl ToArray<u8, 32> for TxId {
     fn to_array(&self) -> [u8; 32] {
@@ -35,3 +37,52 @@ pub enum TransactionStatusDef {
     /// block at the provided height.
     Mined(#[serde_as(as = "FromInto<u32>")] zcash_primitives::consensus::BlockHeight),
 }
+
+#[serde_as]
+#[derive(Serialize, Deserialize)]
+#[serde(remote = "TxOut")]
+pub struct TxOutDef {
+    #[serde_as(as = "TryFromInto<u64>")]
+    pub value: NonNegativeAmount,
+    #[serde_as(as = "ScriptDef")]
+    pub script_pubkey: Script,
+}
+
+impl SerializeAs<TxOut> for TxOutDef {
+    fn serialize_as<S>(value: &TxOut, serializer: S) -> Result<S::Ok, S::Error>
+    where
+        S: serde::Serializer,
+    {
+        TxOutDef::serialize(value, serializer)
+    }
+}
+
+impl<'de> DeserializeAs<'de, TxOut> for TxOutDef {
+    fn deserialize_as<D>(deserializer: D) -> Result<TxOut, D::Error>
+    where
+        D: Deserializer<'de>,
+    {
+        TxOutDef::deserialize(deserializer)
+    }
+}
+
+#[derive(Serialize, Deserialize)]
+#[serde(remote = "Script")]
+pub struct ScriptDef(pub Vec<u8>);
+impl SerializeAs<Script> for ScriptDef {
+    fn serialize_as<S>(value: &Script, serializer: S) -> Result<S::Ok, S::Error>
+    where
+        S: serde::Serializer,
+    {
+        ScriptDef::serialize(value, serializer)
+    }
+}
+
+impl<'de> DeserializeAs<'de, Script> for ScriptDef {
+    fn deserialize_as<D>(deserializer: D) -> Result<Script, D::Error>
+    where
+        D: Deserializer<'de>,
+    {
+        ScriptDef::deserialize(deserializer)
+    }
+}
diff --git a/zcash_client_memory/src/types/serialization/transparent.rs b/zcash_client_memory/src/types/serialization/transparent.rs
new file mode 100644
index 0000000000..e0a111dbe2
--- /dev/null
+++ b/zcash_client_memory/src/types/serialization/transparent.rs
@@ -0,0 +1,25 @@
+// use sapling::{value::NoteValue, PaymentAddress, Rseed};
+// use serde_with::{DeserializeAs, SerializeAs};
+
+// use zcash_address::ZcashAddress;
+// use zcash_client_backend::wallet::Note;
+// use zip32::Scope;
+
+// use std::io;
+
+// use serde::{Deserialize, Deserializer, Serialize, Serializer};
+
+// use serde_with::serde_as;
+
+// use zcash_client_backend::wallet::{NoteId, Recipient};
+
+// use crate::{ByteArray, TransparentAddressDef, TryByteArray, ZcashAddressDef};
+
+// use zcash_primitives::{
+//     legacy::TransparentAddress,
+//     transaction::{components::OutPoint, TxId},
+// };
+
+// use zcash_protocol::{PoolType, ShieldedProtocol};
+
+// use super::{ToArray, TryFromArray};
diff --git a/zcash_client_memory/src/types/transparent.rs b/zcash_client_memory/src/types/transparent.rs
new file mode 100644
index 0000000000..c207772cba
--- /dev/null
+++ b/zcash_client_memory/src/types/transparent.rs
@@ -0,0 +1,60 @@
+use std::collections::BTreeMap;
+
+use serde::{Deserialize, Serialize};
+use serde_with::serde_as;
+use serde_with::FromInto;
+use zcash_client_backend::wallet::WalletTransparentOutput;
+use zcash_primitives::{
+    legacy::TransparentAddress,
+    transaction::{
+        components::{OutPoint, TxOut},
+        TxId,
+    },
+};
+use zcash_protocol::consensus::BlockHeight;
+
+use super::AccountId;
+use crate::{ByteArray, OutPointDef, TransparentAddressDef, TxOutDef};
+
+pub struct TransparentOutputTable(BTreeMap<OutPoint, ReceivedTransparentUtxo>);
+
+impl TransparentOutputTable {
+    pub fn new() -> Self {
+        Self(BTreeMap::new())
+    }
+}
+
+#[serde_as]
+#[derive(Serialize, Deserialize)]
+pub struct ReceivedTransparentUtxoSpends(
+    #[serde_as(as = "BTreeMap<OutPointDef, ByteArray<32>>")] BTreeMap<OutPoint, TxId>,
+);
+
+#[serde_as]
+#[derive(Serialize, Deserialize)]
+// transparent_received_outputs
+pub struct ReceivedTransparentUtxo {
+    // transaction_id, output_index
+    #[serde_as(as = "OutPointDef")]
+    outpoint: OutPoint,
+    // Spend authority of this utxo
+    account_id: AccountId,
+    // value_zat, script_pubkey
+    #[serde_as(as = "TxOutDef")]
+    txout: TxOut,
+    #[serde_as(as = "TransparentAddressDef")]
+    recipient_address: TransparentAddress,
+    #[serde_as(as = "Option<FromInto<u32>>")]
+    max_observed_unspent_height: Option<BlockHeight>,
+    // ??? do we need?
+    #[serde_as(as = "Option<FromInto<u32>>")]
+    mined_height: Option<BlockHeight>,
+}
+
+#[serde_as]
+#[derive(Serialize, Deserialize)]
+pub struct SentTransparentUtxoTable(
+    #[serde_as(as = "BTreeMap<OutPointDef,_>")] BTreeMap<OutPoint, SentUtxo>,
+);
+#[derive(Serialize, Deserialize)]
+struct SentUtxo {}
diff --git a/zcash_client_memory/src/wallet_write.rs b/zcash_client_memory/src/wallet_write.rs
index e7323d4748..cc1f563098 100644
--- a/zcash_client_memory/src/wallet_write.rs
+++ b/zcash_client_memory/src/wallet_write.rs
@@ -41,6 +41,12 @@ use {secrecy::ExposeSecret, zip32::fingerprint::SeedFingerprint};
 #[cfg(feature = "orchard")]
 use zcash_protocol::ShieldedProtocol::Orchard;
 
+#[cfg(feature = "transparent-inputs")]
+use {
+    zcash_client_backend::wallet::TransparentAddressMetadata,
+    zcash_primitives::legacy::TransparentAddress,
+};
+
 impl<P: consensus::Parameters> WalletWrite for MemoryWalletDb<P> {
     type UtxoRef = u32;
 
@@ -578,9 +584,16 @@ impl<P: consensus::Parameters> WalletWrite for MemoryWalletDb<P> {
     /// Adds a transparent UTXO received by the wallet to the data store.
     fn put_received_transparent_utxo(
         &mut self,
-        _output: &WalletTransparentOutput,
+        output: &WalletTransparentOutput,
     ) -> Result<Self::UtxoRef, Self::Error> {
         tracing::debug!("put_received_transparent_utxo");
+        let address = output.recipient_address();
+        // TODO: find_account_for_transparent_address??
+        if let Some(receiving_account) = self.find_account_for_ephemeral_address(address)? {}
+        #[cfg(not(feature = "transparent-inputs"))]
+        panic!(
+            "The wallet must be compiled with the transparent-inputs feature to use this method."
+        );
         Ok(0)
     }
 
@@ -700,6 +713,17 @@ Instead derive the ufvk in the calling code and import it using `import_account_
         }
         Ok(())
     }
+    #[cfg(feature = "transparent-inputs")]
+    fn reserve_next_n_ephemeral_addresses(
+        &mut self,
+        _account_id: Self::AccountId,
+        _n: usize,
+    ) -> Result<Vec<(TransparentAddress, TransparentAddressMetadata)>, Self::Error> {
+        // Default impl is required for feature-flagged trait methods to prevent
+        // breakage due to inadvertent activation of features by transitive dependencies
+        // of the implementing crate.
+        Ok(vec![])
+    }
 
     fn set_transaction_status(
         &mut self,