diff --git a/indexer/core/src/lib.rs b/indexer/core/src/lib.rs
index c794b713..78012c6e 100644
--- a/indexer/core/src/lib.rs
+++ b/indexer/core/src/lib.rs
@@ -2,7 +2,7 @@ use std::sync::Arc;
 
 use anyhow::Result;
 use bedrock_client::BedrockClient;
-use common::block::{Block, };
+use common::block::Block;
 use futures::StreamExt;
 use log::info;
 use logos_blockchain_core::mantle::{
@@ -38,9 +38,7 @@ impl IndexerCore {
         })
     }
 
-    pub async fn subscribe_parse_block_stream(
-        &self,
-    ) -> impl futures::Stream<Item = Result<Block>> {
+    pub async fn subscribe_parse_block_stream(&self) -> impl futures::Stream<Item = Result<Block>> {
         async_stream::stream! {
             loop {
                 let mut stream_pinned = Box::pin(self.bedrock_client.get_lib_stream().await?);
diff --git a/indexer/service/src/main.rs b/indexer/service/src/main.rs
index aaeebacd..e0ece691 100644
--- a/indexer/service/src/main.rs
+++ b/indexer/service/src/main.rs
@@ -63,7 +63,7 @@ async fn run_server(config_path: PathBuf, port: u16) -> Result<jsonrpsee::server
         let service = indexer_service::service::IndexerService::new(config)
             .context("Failed to initialize indexer service")?;
         server.start(service.into_rpc())
-    }?;
+    };
     #[cfg(feature = "mock-responses")]
     let handle = server.start(
         indexer_service::mock_service::MockIndexerService::new_with_mock_blocks().into_rpc(),
diff --git a/sequencer_core/src/lib.rs b/sequencer_core/src/lib.rs
index 4af124e4..1e198c17 100644
--- a/sequencer_core/src/lib.rs
+++ b/sequencer_core/src/lib.rs
@@ -1,4 +1,4 @@
-use std::{fmt::Display, time::Instant};
+use std::{fmt::Display, sync::Arc, time::Instant};
 
 use anyhow::Result;
 #[cfg(feature = "testnet")]
@@ -19,7 +19,7 @@ mod block_settlement_client;
 pub mod block_store;
 pub mod config;
 
-type IndexerClient = jsonrpsee::http_client::HttpClient;
+type IndexerClient = Arc<jsonrpsee::ws_client::WsClient>;
 
 pub struct SequencerCore {
     state: nssa::V02State,
@@ -52,7 +52,9 @@ impl SequencerCore {
     /// assumed to represent the correct latest state consistent with Bedrock-finalized data.
     /// If no database is found, the sequencer performs a fresh start from genesis,
     /// initializing its state with the accounts defined in the configuration file.
-    pub fn start_from_config(config: SequencerConfig) -> (Self, MemPoolHandle<EncodedTransaction>) {
+    pub async fn start_from_config(
+        config: SequencerConfig,
+    ) -> (Self, MemPoolHandle<EncodedTransaction>) {
         let hashable_data = HashableBlockData {
             block_id: config.genesis_id,
             transactions: vec![],
@@ -116,9 +118,12 @@ impl SequencerCore {
                 .expect("Block settlement client should be constructible")
         });
 
-        let indexer_client = jsonrpsee::http_client::HttpClientBuilder::default()
-            .build(config.indexer_rpc_url.clone())
-            .expect("Failed to create Indexer client");
+        let indexer_client = Arc::new(
+            jsonrpsee::ws_client::WsClientBuilder::default()
+                .build(config.indexer_rpc_url.clone())
+                .await
+                .expect("Failed to create Indexer client"),
+        );
 
         let sequencer_core = Self {
             state,
@@ -275,8 +280,8 @@ impl SequencerCore {
         self.block_settlement_client.clone()
     }
 
-    pub fn indexer_client(&self) -> &IndexerClient {
-        &self.indexer_client
+    pub fn indexer_client(&self) -> IndexerClient {
+        Arc::clone(&self.indexer_client)
     }
 }
 
@@ -387,7 +392,7 @@ mod tests {
     async fn common_setup_with_config(
         config: SequencerConfig,
     ) -> (SequencerCore, MemPoolHandle<EncodedTransaction>) {
-        let (mut sequencer, mempool_handle) = SequencerCore::start_from_config(config);
+        let (mut sequencer, mempool_handle) = SequencerCore::start_from_config(config).await;
 
         let tx = common::test_utils::produce_dummy_empty_transaction();
         mempool_handle.push(tx).await.unwrap();
@@ -399,10 +404,10 @@ mod tests {
         (sequencer, mempool_handle)
     }
 
-    #[test]
-    fn test_start_from_config() {
+    #[tokio::test]
+    async fn test_start_from_config() {
         let config = setup_sequencer_config();
-        let (sequencer, _mempool_handle) = SequencerCore::start_from_config(config.clone());
+        let (sequencer, _mempool_handle) = SequencerCore::start_from_config(config.clone()).await;
 
         assert_eq!(sequencer.chain_height, config.genesis_id);
         assert_eq!(sequencer.sequencer_config.max_num_tx_in_block, 10);
@@ -436,8 +441,8 @@ mod tests {
         assert_eq!(20000, balance_acc_2);
     }
 
-    #[test]
-    fn test_start_different_intial_accounts_balances() {
+    #[tokio::test]
+    async fn test_start_different_intial_accounts_balances() {
         let acc1_account_id: Vec<u8> = vec![
             27, 132, 197, 86, 123, 18, 100, 64, 153, 93, 62, 213, 170, 186, 5, 101, 215, 30, 24,
             52, 96, 72, 25, 255, 156, 23, 245, 233, 213, 221, 7, 143,
@@ -461,7 +466,7 @@ mod tests {
         let initial_accounts = vec![initial_acc1, initial_acc2];
 
         let config = setup_sequencer_config_variable_initial_accounts(initial_accounts);
-        let (sequencer, _mempool_handle) = SequencerCore::start_from_config(config.clone());
+        let (sequencer, _mempool_handle) = SequencerCore::start_from_config(config.clone()).await;
 
         let acc1_account_id = config.initial_accounts[0]
             .account_id
@@ -788,7 +793,8 @@ mod tests {
         // from `acc_1` to `acc_2`. The block created with that transaction will be kept stored in
         // the temporary directory for the block storage of this test.
         {
-            let (mut sequencer, mempool_handle) = SequencerCore::start_from_config(config.clone());
+            let (mut sequencer, mempool_handle) =
+                SequencerCore::start_from_config(config.clone()).await;
             let signing_key = PrivateKey::try_new([1; 32]).unwrap();
 
             let tx = common::test_utils::create_transaction_native_token_transfer(
@@ -810,7 +816,7 @@ mod tests {
 
         // Instantiating a new sequencer from the same config. This should load the existing block
         // with the above transaction and update the state to reflect that.
-        let (sequencer, _mempool_handle) = SequencerCore::start_from_config(config.clone());
+        let (sequencer, _mempool_handle) = SequencerCore::start_from_config(config.clone()).await;
         let balance_acc_1 = sequencer.state.get_account_by_id(&acc1_account_id).balance;
         let balance_acc_2 = sequencer.state.get_account_by_id(&acc2_account_id).balance;
 
@@ -825,10 +831,10 @@ mod tests {
         );
     }
 
-    #[test]
-    fn test_get_pending_blocks() {
+    #[tokio::test]
+    async fn test_get_pending_blocks() {
         let config = setup_sequencer_config();
-        let (mut sequencer, _mempool_handle) = SequencerCore::start_from_config(config);
+        let (mut sequencer, _mempool_handle) = SequencerCore::start_from_config(config).await;
         sequencer
             .produce_new_block_with_mempool_transactions()
             .unwrap();
@@ -841,10 +847,10 @@ mod tests {
         assert_eq!(sequencer.get_pending_blocks().unwrap().len(), 4);
     }
 
-    #[test]
-    fn test_delete_blocks() {
+    #[tokio::test]
+    async fn test_delete_blocks() {
         let config = setup_sequencer_config();
-        let (mut sequencer, _mempool_handle) = SequencerCore::start_from_config(config);
+        let (mut sequencer, _mempool_handle) = SequencerCore::start_from_config(config).await;
         sequencer
             .produce_new_block_with_mempool_transactions()
             .unwrap();
diff --git a/sequencer_rpc/src/process.rs b/sequencer_rpc/src/process.rs
index e2d6052a..0702ac1f 100644
--- a/sequencer_rpc/src/process.rs
+++ b/sequencer_rpc/src/process.rs
@@ -407,7 +407,7 @@ mod tests {
     async fn components_for_tests() -> (JsonHandler, Vec<AccountInitialData>, EncodedTransaction) {
         let config = sequencer_config_for_tests();
 
-        let (mut sequencer_core, mempool_handle) = SequencerCore::start_from_config(config);
+        let (mut sequencer_core, mempool_handle) = SequencerCore::start_from_config(config).await;
         let initial_accounts = sequencer_core.sequencer_config().initial_accounts.clone();
 
         let signing_key = nssa::PrivateKey::try_new([1; 32]).unwrap();
diff --git a/sequencer_runner/src/lib.rs b/sequencer_runner/src/lib.rs
index d62d0ca3..17c984f5 100644
--- a/sequencer_runner/src/lib.rs
+++ b/sequencer_runner/src/lib.rs
@@ -91,7 +91,7 @@ pub async fn startup_sequencer(
         Duration::from_millis(app_config.retry_pending_blocks_timeout_millis);
     let port = app_config.port;
 
-    let (sequencer_core, mempool_handle) = SequencerCore::start_from_config(app_config);
+    let (sequencer_core, mempool_handle) = SequencerCore::start_from_config(app_config).await;
 
     info!("Sequencer core set up");
 
@@ -185,7 +185,7 @@ async fn retry_pending_blocks_loop(
 async fn listen_for_bedrock_blocks_loop(seq_core: Arc<Mutex<SequencerCore>>) -> Result<Never> {
     use indexer_service_rpc::RpcClient as _;
 
-    let indexer_client = seq_core.lock().await.indexer_client().clone();
+    let indexer_client = seq_core.lock().await.indexer_client();
 
     loop {
         // TODO: Subscribe from the first pending block ID?