diff --git a/rust/chains/hyperlane-ethereum/src/interchain_gas.rs b/rust/chains/hyperlane-ethereum/src/interchain_gas.rs
index 24b7ae502..b4a93fd54 100644
--- a/rust/chains/hyperlane-ethereum/src/interchain_gas.rs
+++ b/rust/chains/hyperlane-ethereum/src/interchain_gas.rs
@@ -84,6 +84,7 @@ impl<M> Indexer<InterchainGasPayment> for EthereumInterchainGasPaymasterIndexer<
 where
     M: Middleware + 'static,
 {
+    /// Note: This call may return duplicates depending on the provider used
     #[instrument(err, skip(self))]
     async fn fetch_logs(
         &self,
diff --git a/rust/chains/hyperlane-ethereum/src/mailbox.rs b/rust/chains/hyperlane-ethereum/src/mailbox.rs
index 4c566abbd..02c5bb51d 100644
--- a/rust/chains/hyperlane-ethereum/src/mailbox.rs
+++ b/rust/chains/hyperlane-ethereum/src/mailbox.rs
@@ -125,6 +125,7 @@ where
         self.get_finalized_block_number().await
     }
 
+    /// Note: This call may return duplicates depending on the provider used
     #[instrument(err, skip(self))]
     async fn fetch_logs(
         &self,
@@ -168,6 +169,7 @@ where
         self.get_finalized_block_number().await
     }
 
+    /// Note: This call may return duplicates depending on the provider used
     #[instrument(err, skip(self))]
     async fn fetch_logs(&self, range: RangeInclusive<u32>) -> ChainResult<Vec<(H256, LogMeta)>> {
         Ok(self
diff --git a/rust/chains/hyperlane-ethereum/src/merkle_tree_hook.rs b/rust/chains/hyperlane-ethereum/src/merkle_tree_hook.rs
index 1beffed5b..90b0f7331 100644
--- a/rust/chains/hyperlane-ethereum/src/merkle_tree_hook.rs
+++ b/rust/chains/hyperlane-ethereum/src/merkle_tree_hook.rs
@@ -105,6 +105,7 @@ impl<M> Indexer<MerkleTreeInsertion> for EthereumMerkleTreeHookIndexer<M>
 where
     M: Middleware + 'static,
 {
+    /// Note: This call may return duplicates depending on the provider used
     #[instrument(err, skip(self))]
     async fn fetch_logs(
         &self,
diff --git a/rust/hyperlane-base/src/contract_sync/mod.rs b/rust/hyperlane-base/src/contract_sync/mod.rs
index 3968ad9f5..219f06c90 100644
--- a/rust/hyperlane-base/src/contract_sync/mod.rs
+++ b/rust/hyperlane-base/src/contract_sync/mod.rs
@@ -1,4 +1,4 @@
-use std::{fmt::Debug, marker::PhantomData, sync::Arc};
+use std::{collections::HashSet, fmt::Debug, hash::Hash, marker::PhantomData, sync::Arc};
 
 use cursor::*;
 use derive_new::new;
@@ -31,7 +31,7 @@ pub struct ContractSync<T, D: HyperlaneLogStore<T>, I: Indexer<T>> {
 
 impl<T, D, I> ContractSync<T, D, I>
 where
-    T: Debug + Send + Sync + Clone + 'static,
+    T: Debug + Send + Sync + Clone + Eq + Hash + 'static,
     D: HyperlaneLogStore<T> + 'static,
     I: Indexer<T> + Clone + 'static,
 {
@@ -67,6 +67,8 @@ where
                     debug!(?range, "Looking for for events in index range");
 
                     let logs = self.indexer.fetch_logs(range.clone()).await?;
+                    let deduped_logs = HashSet::<_>::from_iter(logs);
+                    let logs = Vec::from_iter(deduped_logs);
 
                     info!(
                         ?range,
diff --git a/rust/hyperlane-core/src/types/log_metadata.rs b/rust/hyperlane-core/src/types/log_metadata.rs
index bdb4b043f..e85824dab 100644
--- a/rust/hyperlane-core/src/types/log_metadata.rs
+++ b/rust/hyperlane-core/src/types/log_metadata.rs
@@ -10,7 +10,7 @@ use crate::{H256, H512, U256};
 /// A close clone of the Ethereum `LogMeta`, this is designed to be a more
 /// generic metadata that we can use for other blockchains later. Some changes
 /// may be required in the future.
-#[derive(Clone, Debug, PartialEq, Eq, Serialize, Deserialize, Default)]
+#[derive(Clone, Debug, PartialEq, Eq, Serialize, Deserialize, Default, Hash)]
 pub struct LogMeta {
     /// Address from which this log originated
     pub address: H256,
diff --git a/rust/hyperlane-core/src/types/merkle_tree.rs b/rust/hyperlane-core/src/types/merkle_tree.rs
index 96ea78ff1..5d4e20a9f 100644
--- a/rust/hyperlane-core/src/types/merkle_tree.rs
+++ b/rust/hyperlane-core/src/types/merkle_tree.rs
@@ -4,7 +4,7 @@ use std::io::{Read, Write};
 use crate::{Decode, Encode, HyperlaneProtocolError, Sequenced, H256};
 
 /// Merkle Tree Hook insertion event
-#[derive(Debug, Copy, Clone, new, Eq, PartialEq)]
+#[derive(Debug, Copy, Clone, new, Eq, PartialEq, Hash)]
 pub struct MerkleTreeInsertion {
     leaf_index: u32,
     message_id: H256,
diff --git a/rust/hyperlane-core/src/types/message.rs b/rust/hyperlane-core/src/types/message.rs
index badabd815..99fb2fef4 100644
--- a/rust/hyperlane-core/src/types/message.rs
+++ b/rust/hyperlane-core/src/types/message.rs
@@ -21,7 +21,7 @@ impl From<&HyperlaneMessage> for RawHyperlaneMessage {
 }
 
 /// A full Hyperlane message between chains
-#[derive(Clone, Eq, PartialEq)]
+#[derive(Clone, Eq, PartialEq, Hash)]
 pub struct HyperlaneMessage {
     /// 1   Hyperlane version number
     pub version: u8,
diff --git a/rust/hyperlane-core/src/types/mod.rs b/rust/hyperlane-core/src/types/mod.rs
index 58d466abc..9d56cb7f0 100644
--- a/rust/hyperlane-core/src/types/mod.rs
+++ b/rust/hyperlane-core/src/types/mod.rs
@@ -115,7 +115,7 @@ pub struct GasPaymentKey {
 }
 
 /// A payment of a message's gas costs.
-#[derive(Debug, Copy, Clone, Default, Eq, PartialEq)]
+#[derive(Debug, Copy, Clone, Default, Eq, PartialEq, Hash)]
 pub struct InterchainGasPayment {
     /// Id of the message
     pub message_id: H256,