diff --git a/Cargo.lock b/Cargo.lock
index fe5fcba34..8685bbd9f 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -4018,6 +4018,7 @@ dependencies = [
  "ibc-eureka-solidity-types 0.1.0",
  "ibc-eureka-utils 0.1.0",
  "ibc-proto 0.51.1 (git+https://github.com/srdtrk/ibc-proto-rs?rev=7074fb20c3a654e945e5ca46627c5a971d785e04)",
+ "ics23",
  "prost",
  "serde",
  "serde_json",
@@ -4027,6 +4028,7 @@ dependencies = [
  "tendermint",
  "tendermint-light-client-verifier",
  "tendermint-rpc",
+ "tonic 0.13.1",
  "tracing",
 ]
 
diff --git a/packages/relayer/lib/Cargo.toml b/packages/relayer/lib/Cargo.toml
index 94fda8252..32d8b26c5 100644
--- a/packages/relayer/lib/Cargo.toml
+++ b/packages/relayer/lib/Cargo.toml
@@ -24,6 +24,7 @@ anyhow        = { workspace = true, features = ["std"] }
 futures       = { workspace = true, default-features = true }
 futures-timer = { workspace = true }
 tracing       = { workspace = true, default-features = true }
+tonic         = { workspace = true }
 
 tendermint     = { workspace = true, features = ["std"] }
 tendermint-rpc = { workspace = true, features = ["http-client"] }
@@ -31,6 +32,7 @@ tendermint-light-client-verifier = { workspace = true }
 
 ibc-proto-eureka          = { workspace = true }
 ibc-core-commitment-types = { workspace = true }
+ics23                     = { workspace = true }
 
 alloy = { workspace = true, features = ["full", "node-bindings"] }
 
diff --git a/packages/relayer/lib/src/lib.rs b/packages/relayer/lib/src/lib.rs
index 01a70c1c0..fec244d6c 100644
--- a/packages/relayer/lib/src/lib.rs
+++ b/packages/relayer/lib/src/lib.rs
@@ -12,5 +12,7 @@ use ibc_core_commitment_types as _;
 pub mod chain;
 pub mod events;
 pub mod listener;
+pub mod service_utils;
+pub mod tendermint_client;
 pub mod tx_builder;
 pub mod utils;
diff --git a/packages/relayer/lib/src/service_utils.rs b/packages/relayer/lib/src/service_utils.rs
new file mode 100644
index 000000000..e2996236f
--- /dev/null
+++ b/packages/relayer/lib/src/service_utils.rs
@@ -0,0 +1,46 @@
+//! Common service patterns and utilities for relayer modules
+//! This module provides shared functionality for `RelayerService` implementations
+
+use tendermint::Hash;
+use tonic::Status;
+
+/// Convert `anyhow::Error` to `tonic::Status`
+#[inline]
+#[must_use]
+pub fn to_tonic_status(err: anyhow::Error) -> Status {
+    Status::from_error(err.into())
+}
+
+/// Parse Cosmos transaction hashes from request
+///
+/// # Errors
+///
+/// Returns a `Status` error if any transaction ID cannot be parsed as a valid hash
+#[inline]
+#[allow(clippy::result_large_err)]
+pub fn parse_cosmos_tx_hashes(tx_ids: Vec<Vec<u8>>) -> Result<Vec<Hash>, Status> {
+    tx_ids
+        .into_iter()
+        .map(Hash::try_from)
+        .collect::<Result<Vec<_>, _>>()
+        .map_err(|e| Status::from_error(e.into()))
+}
+
+/// Parse Ethereum transaction hashes from request
+///
+/// # Errors
+///
+/// Returns a `Status` error if any transaction ID is not exactly 32 bytes
+#[inline]
+#[allow(clippy::result_large_err)]
+pub fn parse_eth_tx_hashes(tx_ids: Vec<Vec<u8>>) -> Result<Vec<[u8; 32]>, Status> {
+    tx_ids
+        .into_iter()
+        .map(|tx_id| {
+            tx_id
+                .try_into()
+                .map_err(|tx| format!("invalid tx hash: {tx:?}"))
+        })
+        .collect::<Result<Vec<[u8; 32]>, _>>()
+        .map_err(|e| Status::from_error(e.into()))
+}
diff --git a/packages/relayer/lib/src/tendermint_client.rs b/packages/relayer/lib/src/tendermint_client.rs
new file mode 100644
index 000000000..1842955f5
--- /dev/null
+++ b/packages/relayer/lib/src/tendermint_client.rs
@@ -0,0 +1,59 @@
+//! Utilities for Tendermint light client configuration
+//! This module provides common functionality for creating and configuring Tendermint client states
+
+use ibc_proto_eureka::{
+    google::protobuf::Duration,
+    ibc::{
+        core::client::v1::Height,
+        lightclients::tendermint::v1::{ClientState, Fraction},
+    },
+};
+
+/// Default trust level for Tendermint light clients (1/3)
+#[must_use]
+pub const fn default_trust_level() -> Fraction {
+    Fraction {
+        numerator: 1,
+        denominator: 3,
+    }
+}
+
+/// Default max clock drift for Tendermint light clients (15 seconds)
+#[must_use]
+pub const fn default_max_clock_drift() -> Duration {
+    Duration {
+        seconds: 15,
+        nanos: 0,
+    }
+}
+
+/// Build a Tendermint client state with common defaults
+///
+/// # Arguments
+/// * `chain_id` - The chain ID
+/// * `height` - The latest height
+/// * `trusting_period` - The trusting period
+/// * `unbonding_period` - The unbonding period
+/// * `proof_specs` - The proof specifications for ICS23
+///
+/// Returns a `ClientState` with default trust level, max clock drift, and the provided proof specs
+#[must_use]
+pub fn build_tendermint_client_state(
+    chain_id: String,
+    height: Height,
+    trusting_period: Duration,
+    unbonding_period: Duration,
+    proof_specs: Vec<ics23::ProofSpec>,
+) -> ClientState {
+    ClientState {
+        chain_id,
+        trust_level: Some(default_trust_level()),
+        trusting_period: Some(trusting_period),
+        unbonding_period: Some(unbonding_period),
+        max_clock_drift: Some(default_max_clock_drift()),
+        latest_height: Some(height),
+        proof_specs,
+        upgrade_path: vec!["upgrade".to_string(), "upgradedIBCState".to_string()],
+        ..Default::default()
+    }
+}
diff --git a/packages/relayer/modules/cosmos-to-cosmos/src/lib.rs b/packages/relayer/modules/cosmos-to-cosmos/src/lib.rs
index 022506a3c..e34f56b3f 100644
--- a/packages/relayer/modules/cosmos-to-cosmos/src/lib.rs
+++ b/packages/relayer/modules/cosmos-to-cosmos/src/lib.rs
@@ -8,16 +8,19 @@
     unused_crate_dependencies
 )]
 
+use ics23 as _;
+use tendermint as _;
+
 pub mod tx_builder;
 
 use std::collections::HashMap;
 
 use ibc_eureka_relayer_lib::{
     listener::{cosmos_sdk, ChainListenerService},
+    service_utils::{parse_cosmos_tx_hashes, to_tonic_status},
     tx_builder::TxBuilderService,
 };
 use ibc_eureka_utils::rpc::TendermintRpcExt;
-use tendermint::Hash;
 use tendermint_rpc::HttpClient;
 use tonic::{Request, Response};
 
@@ -85,7 +88,7 @@ impl RelayerService for CosmosToCosmosRelayerModuleService {
                     .target_listener
                     .chain_id()
                     .await
-                    .map_err(|e| tonic::Status::from_error(e.into()))?,
+                    .map_err(to_tonic_status)?,
                 ibc_version: "2".to_string(),
                 ibc_contract: String::new(),
             }),
@@ -94,7 +97,7 @@ impl RelayerService for CosmosToCosmosRelayerModuleService {
                     .src_listener
                     .chain_id()
                     .await
-                    .map_err(|e| tonic::Status::from_error(e.into()))?,
+                    .map_err(to_tonic_status)?,
                 ibc_version: "2".to_string(),
                 ibc_contract: String::new(),
             }),
@@ -112,19 +115,9 @@ impl RelayerService for CosmosToCosmosRelayerModuleService {
         let inner_req = request.into_inner();
         tracing::info!("Got {} source tx IDs", inner_req.source_tx_ids.len());
         tracing::info!("Got {} timeout tx IDs", inner_req.timeout_tx_ids.len());
-        let src_txs = inner_req
-            .source_tx_ids
-            .into_iter()
-            .map(Hash::try_from)
-            .collect::<Result<Vec<_>, _>>()
-            .map_err(|e| tonic::Status::from_error(e.into()))?;
+        let src_txs = parse_cosmos_tx_hashes(inner_req.source_tx_ids)?;
 
-        let target_txs = inner_req
-            .timeout_tx_ids
-            .into_iter()
-            .map(Hash::try_from)
-            .collect::<Result<Vec<_>, _>>()
-            .map_err(|e| tonic::Status::from_error(e.into()))?;
+        let target_txs = parse_cosmos_tx_hashes(inner_req.timeout_tx_ids)?;
 
         let src_events = self
             .src_listener
diff --git a/packages/relayer/modules/cosmos-to-cosmos/src/tx_builder.rs b/packages/relayer/modules/cosmos-to-cosmos/src/tx_builder.rs
index a1fd65fca..6002c8b43 100644
--- a/packages/relayer/modules/cosmos-to-cosmos/src/tx_builder.rs
+++ b/packages/relayer/modules/cosmos-to-cosmos/src/tx_builder.rs
@@ -11,14 +11,15 @@ use ibc_proto_eureka::{
     google::protobuf::{Any, Duration},
     ibc::{
         core::client::v1::{Height, MsgCreateClient, MsgUpdateClient},
-        lightclients::tendermint::v1::{ClientState, Fraction},
+        lightclients::tendermint::v1::ClientState,
     },
 };
 use prost::Message;
 use tendermint_rpc::HttpClient;
 
 use ibc_eureka_relayer_lib::{
-    chain::CosmosSdk, events::EurekaEventWithHeight, tx_builder::TxBuilderService, utils::cosmos,
+    chain::CosmosSdk, events::EurekaEventWithHeight,
+    tendermint_client::build_tendermint_client_state, tx_builder::TxBuilderService, utils::cosmos,
 };
 
 /// The `TxBuilder` produces txs to [`CosmosSdk`] based on events from [`CosmosSdk`].
@@ -167,37 +168,28 @@ impl TxBuilderService<CosmosSdk, CosmosSdk> for TxBuilder {
             revision_number: chain_id.revision_number(),
             revision_height: latest_light_block.height().value(),
         };
-        let default_trust_level = Fraction {
-            numerator: 1,
-            denominator: 3,
-        };
-        let default_max_clock_drift = Duration {
-            seconds: 15,
-            nanos: 0,
-        };
         let unbonding_period = self
             .source_tm_client
             .sdk_staking_params()
             .await?
             .unbonding_time
             .ok_or_else(|| anyhow::anyhow!("No unbonding time found"))?;
+
         // Defaults to the recommended 2/3 of the UnbondingPeriod
         let trusting_period = Duration {
             seconds: 2 * (unbonding_period.seconds / 3),
             nanos: 0,
         };
 
-        let client_state = ClientState {
-            chain_id: chain_id.to_string(),
-            trust_level: Some(default_trust_level),
-            trusting_period: Some(trusting_period),
-            unbonding_period: Some(unbonding_period),
-            max_clock_drift: Some(default_max_clock_drift),
-            latest_height: Some(height),
-            proof_specs: vec![ics23::iavl_spec(), ics23::tendermint_spec()],
-            upgrade_path: vec!["upgrade".to_string(), "upgradedIBCState".to_string()],
-            ..Default::default()
-        };
+        let proof_specs = vec![ics23::iavl_spec(), ics23::tendermint_spec()];
+
+        let client_state = build_tendermint_client_state(
+            chain_id.to_string(),
+            height,
+            trusting_period,
+            unbonding_period,
+            proof_specs,
+        );
 
         let consensus_state = latest_light_block.to_consensus_state();
 
diff --git a/packages/relayer/modules/cosmos-to-eth/src/lib.rs b/packages/relayer/modules/cosmos-to-eth/src/lib.rs
index f2e44982e..9ff6dc2af 100644
--- a/packages/relayer/modules/cosmos-to-eth/src/lib.rs
+++ b/packages/relayer/modules/cosmos-to-eth/src/lib.rs
@@ -8,6 +8,8 @@
     unused_crate_dependencies
 )]
 
+use tendermint as _;
+
 pub mod tx_builder;
 
 use alloy::{
@@ -16,6 +18,7 @@ use alloy::{
 };
 use ibc_eureka_relayer_lib::{
     listener::{cosmos_sdk, eth_eureka, ChainListenerService},
+    service_utils::{parse_cosmos_tx_hashes, to_tonic_status},
     tx_builder::TxBuilderService,
 };
 use ibc_eureka_utils::rpc::TendermintRpcExt;
@@ -25,7 +28,6 @@ use sp1_ics07_tendermint_prover::programs::{
 };
 use sp1_prover::components::CpuProverComponents;
 use sp1_sdk::{Prover, ProverClient};
-use tendermint::Hash;
 use tendermint_rpc::HttpClient;
 use tonic::{Request, Response};
 use tx_builder::TxBuilder;
@@ -249,16 +251,12 @@ impl RelayerService for CosmosToEthRelayerModuleService {
                     .eth_listener
                     .chain_id()
                     .await
-                    .map_err(|e| tonic::Status::from_error(e.into()))?,
+                    .map_err(to_tonic_status)?,
                 ibc_version: "2".to_string(),
                 ibc_contract: self.tx_builder.ics26_router.address().to_string(),
             }),
             source_chain: Some(api::Chain {
-                chain_id: self
-                    .tm_listener
-                    .chain_id()
-                    .await
-                    .map_err(|e| tonic::Status::from_error(e.into()))?,
+                chain_id: self.tm_listener.chain_id().await.map_err(to_tonic_status)?,
                 ibc_version: "2".to_string(),
                 ibc_contract: String::new(),
             }),
@@ -276,12 +274,7 @@ impl RelayerService for CosmosToEthRelayerModuleService {
         let inner_req = request.into_inner();
         tracing::info!("Got {} source tx IDs", inner_req.source_tx_ids.len());
         tracing::info!("Got {} timeout tx IDs", inner_req.timeout_tx_ids.len());
-        let cosmos_txs = inner_req
-            .source_tx_ids
-            .into_iter()
-            .map(Hash::try_from)
-            .collect::<Result<Vec<_>, _>>()
-            .map_err(|e| tonic::Status::from_error(e.into()))?;
+        let cosmos_txs = parse_cosmos_tx_hashes(inner_req.source_tx_ids)?;
 
         let eth_txs = inner_req
             .timeout_tx_ids
diff --git a/packages/relayer/modules/eth-to-cosmos/src/lib.rs b/packages/relayer/modules/eth-to-cosmos/src/lib.rs
index 3279d3986..cf5f9b294 100644
--- a/packages/relayer/modules/eth-to-cosmos/src/lib.rs
+++ b/packages/relayer/modules/eth-to-cosmos/src/lib.rs
@@ -8,6 +8,8 @@
     unused_crate_dependencies
 )]
 
+use tendermint as _;
+
 pub mod tx_builder;
 
 use std::collections::HashMap;
@@ -19,10 +21,10 @@ use alloy::{
 use ibc_eureka_relayer_lib::{
     events::EurekaEventWithHeight,
     listener::{cosmos_sdk, eth_eureka, ChainListenerService},
+    service_utils::{parse_cosmos_tx_hashes, parse_eth_tx_hashes, to_tonic_status},
     tx_builder::TxBuilderService,
 };
 use ibc_eureka_utils::rpc::TendermintRpcExt;
-use tendermint::Hash;
 use tendermint_rpc::HttpClient;
 use tonic::{Request, Response};
 
@@ -114,11 +116,7 @@ impl RelayerService for EthToCosmosRelayerModuleService {
         tracing::info!("Handling info request for Eth to Cosmos...");
         Ok(Response::new(api::InfoResponse {
             target_chain: Some(api::Chain {
-                chain_id: self
-                    .tm_listener
-                    .chain_id()
-                    .await
-                    .map_err(|e| tonic::Status::from_error(e.into()))?,
+                chain_id: self.tm_listener.chain_id().await.map_err(to_tonic_status)?,
                 ibc_version: "2".to_string(),
                 ibc_contract: String::new(),
             }),
@@ -127,7 +125,7 @@ impl RelayerService for EthToCosmosRelayerModuleService {
                     .eth_listener
                     .chain_id()
                     .await
-                    .map_err(|e| tonic::Status::from_error(e.into()))?,
+                    .map_err(to_tonic_status)?,
                 ibc_version: "2".to_string(),
                 ibc_contract: self.tx_builder.ics26_router_address().to_string(),
             }),
@@ -145,20 +143,10 @@ impl RelayerService for EthToCosmosRelayerModuleService {
         let inner_req = request.into_inner();
         tracing::info!("Got {} source tx IDs", inner_req.source_tx_ids.len());
         tracing::info!("Got {} timeout tx IDs", inner_req.timeout_tx_ids.len());
-        let eth_txs = inner_req
-            .source_tx_ids
-            .into_iter()
-            .map(TryInto::<[u8; 32]>::try_into)
-            .map(|tx_hash| tx_hash.map(TxHash::from))
-            .collect::<Result<Vec<_>, _>>()
-            .map_err(|tx| tonic::Status::from_error(format!("invalid tx hash: {tx:?}").into()))?;
-
-        let cosmos_txs = inner_req
-            .timeout_tx_ids
-            .into_iter()
-            .map(Hash::try_from)
-            .collect::<Result<Vec<_>, _>>()
-            .map_err(|e| tonic::Status::from_error(e.into()))?;
+        let eth_tx_hashes = parse_eth_tx_hashes(inner_req.source_tx_ids)?;
+        let eth_txs = eth_tx_hashes.into_iter().map(TxHash::from).collect();
+
+        let cosmos_txs = parse_cosmos_tx_hashes(inner_req.timeout_tx_ids)?;
 
         let eth_events = self
             .eth_listener
diff --git a/packages/relayer/modules/eth-to-cosmos/src/tx_builder.rs b/packages/relayer/modules/eth-to-cosmos/src/tx_builder.rs
index 5b94f8f0a..346569d2f 100644
--- a/packages/relayer/modules/eth-to-cosmos/src/tx_builder.rs
+++ b/packages/relayer/modules/eth-to-cosmos/src/tx_builder.rs
@@ -453,15 +453,15 @@ where
             .compute_sync_committee_period_at_slot(ethereum_client_state.latest_slot);
         let latest_period = ethereum_client_state.compute_sync_committee_period_at_slot(proof_slot);
         tracing::info!(
-            "Relay events summary: 
+            "Relay events summary:
                 client id: {},
-                recv events processed: #{}, 
-                ack events processed: #{}, 
-                timeout events processed: #{}, 
-                initial slot: {}, 
-                latest trusted slot (after updates): {}, 
-                initial period: {}, 
-                latest period: {}, 
+                recv events processed: #{},
+                ack events processed: #{},
+                timeout events processed: #{},
+                initial slot: {},
+                latest trusted slot (after updates): {},
+                initial period: {},
+                latest period: {},
                 number of headers: #{}",
             dst_client_id,
             recv_msgs.len(),
@@ -649,12 +649,12 @@ where
             .compute_sync_committee_period_at_slot(ethereum_client_state.latest_slot);
         let latest_period = ethereum_client_state.compute_sync_committee_period_at_slot(proof_slot);
         tracing::info!(
-            "Update client summary: 
+            "Update client summary:
                 client id: {},
-                initial slot: {}, 
-                latest trusted slot (after updates): {}, 
-                initial period: {}, 
-                latest period: {}, 
+                initial slot: {},
+                latest trusted slot (after updates): {},
+                initial period: {},
+                latest period: {},
                 number of headers: #{}",
             dst_client_id,
             ethereum_client_state.latest_slot,