diff --git a/src/pset/elip_liquidex.rs b/src/pset/elip_liquidex.rs
new file mode 100644
index 00000000..a25471bc
--- /dev/null
+++ b/src/pset/elip_liquidex.rs
@@ -0,0 +1,113 @@
+//!
+//! An implementation of ELIP0XXX as defined in
+//! <https://github.com/ElementsProject/ELIPs/blob/main/elip-0XXX.mediawiki>
+//!
+//! ELIP0XXX defines how to encode the extra data for LiquiDEX in a PSET.
+//!
+
+use crate::pset::{
+    confidential::AssetBlindingFactor,
+    encode,
+    raw::ProprietaryKey,
+    serialize::{Deserialize, Serialize},
+    Input, Output,
+};
+
+/// Input Asset Blinding Factor keytype as defined in ELIP0XXX
+pub const PSBT_ELEMENTS_LIQUIDEX_IN_ABF: u8 = 0x00u8;
+
+/// Output Asset Blinding Factor keytype as defined in ELIP0XXX
+pub const PSBT_ELEMENTS_LIQUIDEX_OUT_ABF: u8 = 0x00u8;
+
+/// Prefix for PSET LiquiDEX extension as defined in ELIP0XXX
+pub const PSET_LIQUIDEX_PREFIX: &[u8] = b"pset_liquidex";
+
+fn prop_key(keytype: u8) -> ProprietaryKey {
+    ProprietaryKey {
+        prefix: PSET_LIQUIDEX_PREFIX.to_vec(),
+        subtype: keytype,
+        key: vec![],
+    }
+}
+
+/// ELIP0XXX LiquiDEX extensions
+impl Input {
+    /// Set Asset Blinding Factor
+    pub fn set_abf(&mut self, abf: AssetBlindingFactor) {
+        let key = prop_key(PSBT_ELEMENTS_LIQUIDEX_IN_ABF);
+        self.proprietary.insert(key, abf.serialize());
+    }
+
+    /// Get Asset Blinding Factor
+    pub fn get_abf(&self) -> Option<Result<AssetBlindingFactor, encode::Error>> {
+        let key = prop_key(PSBT_ELEMENTS_LIQUIDEX_IN_ABF);
+        self.proprietary
+            .get(&key)
+            .map(|data| AssetBlindingFactor::deserialize(data))
+    }
+}
+
+/// ELIP0XXX LiquiDEX extensions
+impl Output {
+    /// Set Asset Blinding Factor
+    pub fn set_abf(&mut self, abf: AssetBlindingFactor) {
+        let key = prop_key(PSBT_ELEMENTS_LIQUIDEX_OUT_ABF);
+        self.proprietary.insert(key, abf.serialize());
+    }
+
+    /// Get Asset Blinding Factor
+    pub fn get_abf(&self) -> Option<Result<AssetBlindingFactor, encode::Error>> {
+        let key = prop_key(PSBT_ELEMENTS_LIQUIDEX_OUT_ABF);
+        self.proprietary
+            .get(&key)
+            .map(|data| AssetBlindingFactor::deserialize(data))
+    }
+}
+
+#[cfg(test)]
+mod test {
+    use super::*;
+    use crate::encode::{serialize_hex, Encodable};
+    use crate::hex::{FromHex, ToHex};
+
+    // b'\xfc\rpset_liquidex'
+    const ELIP0XXX_IDENTIFIER: &str = "fc0d707365745f6c69717569646578";
+
+    #[test]
+    fn prop_key_serialize() {
+        let key = prop_key(PSBT_ELEMENTS_LIQUIDEX_IN_ABF);
+        let mut vec = vec![];
+        key.consensus_encode(&mut vec).unwrap();
+
+        assert_eq!(
+            vec.to_hex(),
+            format!("0d{}00", PSET_LIQUIDEX_PREFIX.to_hex())
+        );
+
+        assert!(vec.to_hex().starts_with(&ELIP0XXX_IDENTIFIER[2..])); // cut proprietary prefix "fc"
+    }
+
+    #[test]
+    fn set_get_abf() {
+        // An ABF that's different if serialized in reverse or not
+        let abf_hex = "3311111111111111111111111111111111111111111111111111111111111111";
+        let abf_bytes = Vec::<u8>::from_hex(abf_hex).unwrap();
+        let abf = AssetBlindingFactor::from_slice(&abf_bytes).unwrap();
+
+        let mut input = Input::default();
+        assert!(input.get_abf().is_none());
+        input.set_abf(abf);
+        assert_eq!(input.get_abf().unwrap().unwrap(), abf);
+        let input_hex = serialize_hex(&input);
+        assert!(input_hex.contains(ELIP0XXX_IDENTIFIER));
+        assert!(input_hex.contains(abf_hex));
+
+        let mut output = Output::default();
+        assert!(output.get_abf().is_none());
+        output.set_abf(abf);
+        assert_eq!(output.get_abf().unwrap().unwrap(), abf);
+        let output_hex = serialize_hex(&output);
+        assert!(output_hex.contains(ELIP0XXX_IDENTIFIER));
+        assert!(output_hex.contains(abf_hex));
+    }
+}
diff --git a/src/pset/mod.rs b/src/pset/mod.rs
index 351202e0..0c832edc 100644
--- a/src/pset/mod.rs
+++ b/src/pset/mod.rs
@@ -30,6 +30,7 @@ mod map;
 pub mod raw;
 pub mod serialize;
 pub mod elip100;
+pub mod elip_liquidex;
 
 #[cfg(feature = "base64")]
 mod str;