diff --git a/cairo-contracts/packages/core/src/channel/components/handler.cairo b/cairo-contracts/packages/core/src/channel/components/handler.cairo
index 84719d4b..68b43213 100644
--- a/cairo-contracts/packages/core/src/channel/components/handler.cairo
+++ b/cairo-contracts/packages/core/src/channel/components/handler.cairo
@@ -5,9 +5,8 @@ pub mod ChannelHandlerComponent {
     use ConnectionHandlerComponent::CoreConnectionQuery;
     use RouterHandlerComponent::RouterInternalTrait;
     use core::num::traits::Zero;
-    use starknet::storage::Map;
     use starknet::storage::{
-        StorageMapReadAccess, StorageMapWriteAccess, StoragePointerReadAccess,
+        Map, StorageMapReadAccess, StorageMapWriteAccess, StoragePointerReadAccess,
         StoragePointerWriteAccess
     };
     use starknet::{get_block_timestamp, get_block_number};
@@ -164,7 +163,6 @@ pub mod ChannelHandlerComponent {
             self.read_packet_ack(@port_id, @channel_id, @sequence)
         }
 
-
         fn is_packet_received(
             self: @ComponentState<TContractState>,
             port_id: PortId,
@@ -174,6 +172,41 @@ pub mod ChannelHandlerComponent {
             self.packet_ack_exists(@port_id, @channel_id, @sequence)
         }
 
+        fn unreceived_packet_sequences(
+            self: @ComponentState<TContractState>,
+            port_id: PortId,
+            channel_id: ChannelId,
+            sequences: Array<Sequence>
+        ) -> Array<Sequence> {
+            assert(sequences.len() > 0, ChannelErrors::EMPTY_SEQUENCE_LIST);
+            let mut unreceived_sequences = ArrayTrait::new();
+            for seq in sequences {
+                if self.read_packet_receipt(@port_id, @channel_id, @seq).is_none() {
+                    unreceived_sequences.append(seq);
+                }
+            };
+            unreceived_sequences
+        }
+
+        fn unreceived_ack_sequences(
+            self: @ComponentState<TContractState>,
+            port_id: PortId,
+            channel_id: ChannelId,
+            sequences: Array<Sequence>
+        ) -> Array<Sequence> {
+            assert(sequences.len() > 0, ChannelErrors::EMPTY_SEQUENCE_LIST);
+            let mut unreceived_sequences = ArrayTrait::new();
+            for seq in sequences {
+                if self
+                    .packet_commitments
+                    .read(commitment_key(@port_id, @channel_id, @seq))
+                    .is_non_zero() {
+                    unreceived_sequences.append(seq)
+                };
+            };
+            unreceived_sequences
+        }
+
         fn next_sequence_send(
             self: @ComponentState<TContractState>, port_id: PortId, channel_id: ChannelId
         ) -> Sequence {
diff --git a/cairo-contracts/packages/core/src/channel/errors.cairo b/cairo-contracts/packages/core/src/channel/errors.cairo
index a5ae1980..0ff98fd3 100644
--- a/cairo-contracts/packages/core/src/channel/errors.cairo
+++ b/cairo-contracts/packages/core/src/channel/errors.cairo
@@ -6,6 +6,7 @@ pub mod ChannelErrors {
     pub const EMPTY_ACK: felt252 = 'ICS04: empty acknowledgement';
     pub const EMPTY_UNRECEIVED_PROOF: felt252 = 'ICS04: empty unreceived proof';
     pub const EMPTY_ACK_PROOF: felt252 = 'ICS04: empty ack proof';
+    pub const EMPTY_SEQUENCE_LIST: felt252 = 'ICS04: empty sequence list';
     pub const ZERO_PROOF_HEIGHT: felt252 = 'ICS04: zero proof height';
     pub const UNSUPPORTED_ORDERING: felt252 = 'ICS04: unsupported ordering';
     pub const INVALID_CHANNEL_STATE: felt252 = 'ICS04: invalid channel state';
diff --git a/cairo-contracts/packages/core/src/channel/interface.cairo b/cairo-contracts/packages/core/src/channel/interface.cairo
index b469e4ba..5c683a53 100644
--- a/cairo-contracts/packages/core/src/channel/interface.cairo
+++ b/cairo-contracts/packages/core/src/channel/interface.cairo
@@ -70,6 +70,12 @@ pub trait IChannelQuery<TContractState> {
     fn is_packet_received(
         self: @TContractState, port_id: PortId, channel_id: ChannelId, sequence: Sequence
     ) -> bool;
+    fn unreceived_packet_sequences(
+        self: @TContractState, port_id: PortId, channel_id: ChannelId, sequences: Array<Sequence>
+    ) -> Array<Sequence>;
+    fn unreceived_ack_sequences(
+        self: @TContractState, port_id: PortId, channel_id: ChannelId, sequences: Array<Sequence>
+    ) -> Array<Sequence>;
     fn next_sequence_send(
         self: @TContractState, port_id: PortId, channel_id: ChannelId
     ) -> Sequence;