diff --git a/src/custom_serde.rs b/src/custom_serde.rs
index 722fffb..0fbddbc 100644
--- a/src/custom_serde.rs
+++ b/src/custom_serde.rs
@@ -72,30 +72,6 @@ where
     Ok(weight)
 }
 
-pub fn amount_from_btc<'de, D>(deserializer: D) -> Result<bitcoin::Amount, D::Error>
-where
-    D: Deserializer<'de>,
-{
-    let btc = f64::deserialize(deserializer)?;
-    bitcoin::Amount::from_btc(btc).map_err(serde::de::Error::custom)
-}
-
-pub fn amount_from_sats<'de, D>(deserializer: D) -> Result<bitcoin::Amount, D::Error>
-where
-    D: Deserializer<'de>,
-{
-    let sats = u64::deserialize(deserializer)?;
-    Ok(bitcoin::Amount::from_sat(sats))
-}
-
-pub fn amount_from_maybe_negative_sats<'de, D>(deserializer: D) -> Result<bitcoin::Amount, D::Error>
-where
-    D: Deserializer<'de>,
-{
-    let sats = i64::deserialize(deserializer)?.unsigned_abs();
-    Ok(bitcoin::Amount::from_sat(sats))
-}
-
 pub fn all_inputs_confirmed_bool_from_height<'de, D>(deserializer: D) -> Result<bool, D::Error>
 where
     D: Deserializer<'de>,
diff --git a/src/request.rs b/src/request.rs
index 9973529..ef2b86c 100644
--- a/src/request.rs
+++ b/src/request.rs
@@ -286,8 +286,8 @@ impl Request for RelayFee {
 /// A request for the confirmed and unconfirmed balance of a specific script hash.
 ///
 /// This corresponds to the `"blockchain.scripthash.get_balance"` Electrum RPC method. It returns
-/// both the confirmed balance (from mined transactions) and unconfirmed balance (from mempool
-/// transactions) for the provided script hash.
+/// the confirmed balance (from mined transactions) and the unconfirmed balance (from mempool transactions) for the
+/// provided script hash. The unconfirmed value is signed and can be negative if confirmed outputs are spent.
 ///
 /// See: <https://electrum-protocol.readthedocs.io/en/latest/protocol-methods.html#blockchain-scripthash-get-balance>
 #[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
diff --git a/src/response.rs b/src/response.rs
index 7510ec4..ac228ae 100644
--- a/src/response.rs
+++ b/src/response.rs
@@ -9,7 +9,7 @@ use std::collections::HashMap;
 use bitcoin::{
     absolute,
     hashes::{Hash, HashEngine},
-    Amount, BlockHash,
+    Amount, BlockHash, SignedAmount,
 };
 
 use crate::DoubleSHA;
@@ -105,7 +105,7 @@ pub struct HeadersSubscribeResp {
 #[serde(transparent)]
 pub struct RelayFeeResp {
     /// The minimum fee amount that the server will accept for relaying transactions.
-    #[serde(deserialize_with = "crate::custom_serde::amount_from_btc")]
+    #[serde(with = "bitcoin::amount::serde::as_btc")]
     pub fee: Amount,
 }
 
@@ -113,12 +113,14 @@ pub struct RelayFeeResp {
 #[derive(Debug, Clone, serde::Deserialize)]
 pub struct GetBalanceResp {
     /// The confirmed balance in satoshis.
-    #[serde(deserialize_with = "crate::custom_serde::amount_from_sats")]
+    #[serde(with = "bitcoin::amount::serde::as_sat")]
     pub confirmed: Amount,
 
-    /// The unconfirmed balance in satoshis (may be negative).
-    #[serde(deserialize_with = "crate::custom_serde::amount_from_maybe_negative_sats")]
-    pub unconfirmed: Amount,
+    /// The unconfirmed balance in satoshis.
+    ///
+    /// Can be negative when confirmed outputs are spent in the mempool.
+    #[serde(with = "bitcoin::amount::serde::as_sat")]
+    pub unconfirmed: SignedAmount,
 }
 
 #[derive(Debug, Clone, serde::Deserialize)]
@@ -177,7 +179,7 @@ pub struct MempoolTx {
     pub txid: bitcoin::Txid,
 
     /// The fee paid by the transaction in satoshis.
-    #[serde(deserialize_with = "crate::custom_serde::amount_from_sats")]
+    #[serde(with = "bitcoin::amount::serde::as_sat")]
     pub fee: bitcoin::Amount,
 
     /// Whether all inputs are confirmed.
@@ -202,7 +204,7 @@ pub struct Utxo {
     pub txid: bitcoin::Txid,
 
     /// The value of the UTXO in satoshis.
-    #[serde(deserialize_with = "crate::custom_serde::amount_from_sats")]
+    #[serde(with = "bitcoin::amount::serde::as_sat")]
     pub value: bitcoin::Amount,
 }