diff --git a/Cargo.lock b/Cargo.lock
index 529dfae..bd64289 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -2070,10 +2070,10 @@ dependencies = [
  "console_error_panic_hook",
  "ethers",
  "execution",
+ "futures",
  "hex",
  "serde",
  "serde-wasm-bindgen 0.4.5",
- "serde_json",
  "wasm-bindgen",
  "wasm-bindgen-futures",
  "web-sys",
diff --git a/Cargo.toml b/Cargo.toml
index 70e19d5..72998d0 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -8,7 +8,7 @@ exclude = [
 ]
 
 [build]
-target = "wasm64-unknown-unknown"
+target = "wasm32-unknown-unknown"
 
 [workspace]
 members = [
diff --git a/client/src/client.rs b/client/src/client.rs
index e7b1f37..8fec402 100644
--- a/client/src/client.rs
+++ b/client/src/client.rs
@@ -37,8 +37,8 @@ use crate::rpc::Rpc;
 #[derive(Default)]
 pub struct ClientBuilder {
     network: Option<Network>,
-    consensus_rpc: Option<wasm_bindgen::JsValue>,
-    execution_rpc: Option<wasm_bindgen::JsValue>,
+    consensus_rpc: Option<Arc<wasm_bindgen::JsValue>>,
+    execution_rpc: Option<Arc<wasm_bindgen::JsValue>>,
     checkpoint: Option<Vec<u8>>,
     #[cfg(not(target_arch = "wasm32"))]
     rpc_port: Option<u16>,
@@ -60,12 +60,12 @@ impl ClientBuilder {
         self
     }
 
-    pub fn consensus_rpc(mut self, consensus_rpc: wasm_bindgen::JsValue) -> Self {
+    pub fn consensus_rpc(mut self, consensus_rpc: Arc<wasm_bindgen::JsValue>) -> Self {
         self.consensus_rpc = Some(consensus_rpc);
         self
     }
 
-    pub fn execution_rpc(mut self, execution_rpc: wasm_bindgen::JsValue) -> Self {
+    pub fn execution_rpc(mut self, execution_rpc: Arc<wasm_bindgen::JsValue>) -> Self {
         self.execution_rpc = Some(execution_rpc);
         self
     }
diff --git a/config/src/base.rs b/config/src/base.rs
index a691841..f28f476 100644
--- a/config/src/base.rs
+++ b/config/src/base.rs
@@ -1,4 +1,5 @@
 use serde::Serialize;
+use std::sync::Arc;
 use wasm_bindgen::JsValue;
 
 use crate::types::{ChainConfig, Forks};
@@ -9,7 +10,7 @@ use crate::utils::bytes_serialize;
 pub struct BaseConfig {
     pub rpc_port: u16,
     #[serde(skip_serializing, skip_deserializing)]
-    pub consensus_rpc: Option<JsValue>,
+    pub consensus_rpc: Option<Arc<JsValue>>,
     #[serde(
         deserialize_with = "bytes_deserialize",
         serialize_with = "bytes_serialize"
diff --git a/config/src/config.rs b/config/src/config.rs
index a703564..10440ad 100644
--- a/config/src/config.rs
+++ b/config/src/config.rs
@@ -4,6 +4,7 @@ use figment::{
 };
 use serde::de::Error;
 use serde::{Deserialize, Deserializer};
+use std::sync::Arc;
 use std::{path::PathBuf, process::exit};
 use wasm_bindgen::JsValue;
 
@@ -16,9 +17,9 @@ use crate::utils::{bytes_deserialize, bytes_opt_deserialize};
 #[derive(Deserialize, Debug, Default)]
 pub struct Config {
     #[serde(skip_serializing, skip_deserializing)]
-    pub consensus_rpc: wasm_bindgen::JsValue,
+    pub consensus_rpc: Arc<wasm_bindgen::JsValue>,
     #[serde(skip_serializing, skip_deserializing)]
-    pub execution_rpc: wasm_bindgen::JsValue,
+    pub execution_rpc: Arc<wasm_bindgen::JsValue>,
     pub rpc_port: Option<u16>,
     #[serde(deserialize_with = "bytes_deserialize")]
     pub default_checkpoint: Vec<u8>,
diff --git a/config/src/networks.rs b/config/src/networks.rs
index 953a0b1..a97816b 100644
--- a/config/src/networks.rs
+++ b/config/src/networks.rs
@@ -1,5 +1,6 @@
 use common::utils::hex_str_to_bytes;
 use serde::{Deserialize, Serialize};
+use std::sync::Arc;
 use strum::{Display, EnumIter};
 use wasm_bindgen::JsValue;
 
@@ -41,7 +42,7 @@ pub fn mainnet() -> BaseConfig {
         )
         .unwrap(),
         rpc_port: 8545,
-        consensus_rpc: Some(JsValue::null()),
+        consensus_rpc: Some(Arc::from(JsValue::null())),
         chain: ChainConfig {
             chain_id: 1,
             genesis_time: 1606824023,
diff --git a/consensus/src/consensus.rs b/consensus/src/consensus.rs
index e5c0e27..e3cbc6e 100644
--- a/consensus/src/consensus.rs
+++ b/consensus/src/consensus.rs
@@ -55,7 +55,7 @@ struct LightClientStore {
 
 impl<R: ConsensusRpc> ConsensusClient<R> {
     pub fn new(
-        rpc_handler: wasm_bindgen::JsValue,
+        rpc_handler: Arc<wasm_bindgen::JsValue>,
         checkpoint_block_root: &[u8],
         config: Arc<Config>,
     ) -> Result<ConsensusClient<R>> {
@@ -660,8 +660,8 @@ mod tests {
     async fn get_client(strict_checkpoint_age: bool) -> ConsensusClient<MockRpc> {
         let base_config = networks::goerli();
         let config = Config {
-            consensus_rpc: wasm_bindgen::JsValue::null(),
-            execution_rpc: wasm_bindgen::JsValue::null(),
+            consensus_rpc: Arc::from(wasm_bindgen::JsValue::null()),
+            execution_rpc: Arc::from(wasm_bindgen::JsValue::null()),
             chain: base_config.chain,
             forks: base_config.forks,
             strict_checkpoint_age,
@@ -672,9 +672,12 @@ mod tests {
             hex::decode("1e591af1e90f2db918b2a132991c7c2ee9a4ab26da496bd6e71e4f0bd65ea870")
                 .unwrap();
 
-        let mut client =
-            ConsensusClient::new(wasm_bindgen::JsValue::null(), &checkpoint, Arc::new(config))
-                .unwrap();
+        let mut client = ConsensusClient::new(
+            Arc::from(wasm_bindgen::JsValue::null()),
+            &checkpoint,
+            Arc::new(config),
+        )
+        .unwrap();
         client.bootstrap().await.unwrap();
         client
     }
diff --git a/consensus/src/rpc/mod.rs b/consensus/src/rpc/mod.rs
index 1061cec..f907448 100644
--- a/consensus/src/rpc/mod.rs
+++ b/consensus/src/rpc/mod.rs
@@ -2,6 +2,7 @@ pub mod nimbus_rpc;
 
 use async_trait::async_trait;
 use eyre::Result;
+use std::sync::Arc;
 
 use crate::types::{BeaconBlock, Bootstrap, FinalityUpdate, OptimisticUpdate, Update};
 
@@ -9,7 +10,7 @@ use crate::types::{BeaconBlock, Bootstrap, FinalityUpdate, OptimisticUpdate, Upd
 #[cfg_attr(not(target_arch = "wasm32"), async_trait)]
 #[cfg_attr(target_arch = "wasm32", async_trait(?Send))]
 pub trait ConsensusRpc {
-    fn new(rpc_handler: wasm_bindgen::JsValue) -> Self;
+    fn new(rpc_handler: Arc<wasm_bindgen::JsValue>) -> Self;
     async fn get_bootstrap(&self, block_root: &'_ [u8]) -> Result<Bootstrap>;
     async fn get_updates(&self, period: u64, count: u8) -> Result<Vec<Update>>;
     async fn get_finality_update(&self) -> Result<FinalityUpdate>;
diff --git a/consensus/src/rpc/nimbus_rpc.rs b/consensus/src/rpc/nimbus_rpc.rs
index f06b646..deddccc 100644
--- a/consensus/src/rpc/nimbus_rpc.rs
+++ b/consensus/src/rpc/nimbus_rpc.rs
@@ -1,11 +1,11 @@
 use std::cmp;
 use std::fmt::{Display, Formatter, Result as FmtResult};
+use std::sync::Arc;
 
 use async_trait::async_trait;
 use eyre::{Result, WrapErr};
-use js_sys::then;
 use serde::Deserialize;
-use serde_wasm_bindgen::from_value as from_js_value;
+use serde_json::from_str as from_json_str;
 use wasm_bindgen::{JsCast, JsValue};
 
 use wasm_bindgen_futures::JsFuture;
@@ -30,13 +30,12 @@ impl std::error::Error for RpcError {}
 
 #[derive(Debug)]
 pub struct NimbusRpc {
-    rpc_handler: wasm_bindgen::JsValue,
+    rpc_handler: Arc<JsValue>,
 }
 
-#[cfg_attr(not(target_arch = "wasm32"), async_trait)]
-#[cfg_attr(target_arch = "wasm32", async_trait(?Send))]
+#[async_trait(?Send)]
 impl ConsensusRpc for NimbusRpc {
-    fn new(rpc_handler: JsValue) -> Self {
+    fn new(rpc_handler: Arc<JsValue>) -> Self {
         NimbusRpc { rpc_handler }
     }
 
@@ -142,7 +141,7 @@ struct Spec {
 }
 
 impl NimbusRpc {
-    async fn request<T>(&self, path: String, error_type: &str) -> Result<T, JsValue>
+    async fn request<T>(&self, path: String, error_type: &str) -> Result<T>
     where
         for<'a> T: Deserialize<'a>,
     {
@@ -150,18 +149,21 @@ impl NimbusRpc {
         js_params.set(&JsValue::from_str("method"), &JsValue::from_str("GET"));
         js_params.set(&JsValue::from_str("path"), &JsValue::from_str(&path));
 
-        let promise = self
-            .rpc_handler
+        let rpc_handler_clone = self.rpc_handler.clone();
+        let promise = Arc::clone(&rpc_handler_clone)
             .dyn_into::<js_sys::Function>()
             .unwrap()
             .call1(&JsValue::null(), &js_params)
             .expect("Failed to make JSON-RPC request");
 
-        let result = match promise.dyn_into::<JsValue>() {
+        let result = match promise.dyn_into::<js_sys::Promise>() {
             Ok(promise) => JsFuture::from(promise).await.unwrap(),
             Err(_) => panic!("Unable to convert JS value to Promise"),
         };
 
-        Ok(result)
+        let json = result.as_string().unwrap();
+        let response: T = serde_json::from_str(&json)?;
+
+        Ok(response)
     }
 }
diff --git a/execution/src/rpc/http_rpc.rs b/execution/src/rpc/http_rpc.rs
index 9f8ad42..bbb0343 100644
--- a/execution/src/rpc/http_rpc.rs
+++ b/execution/src/rpc/http_rpc.rs
@@ -1,6 +1,7 @@
 use std::error::Error;
 use std::fmt::{Debug, Display, Formatter};
 use std::str::FromStr;
+use std::sync::Arc;
 
 use async_trait::async_trait;
 use ethers::prelude::{Address, Http};
@@ -30,7 +31,7 @@ use wasm_bindgen_futures::JsFuture;
 
 pub struct HttpRpc {
     provider: Provider<LumeProvider>,
-    rpc_handler: JsValue,
+    rpc_handler: Arc<JsValue>,
 }
 
 impl Clone for HttpRpc {
@@ -65,15 +66,17 @@ impl From<LumeError> for ProviderError {
 
 #[derive(Clone, Debug)]
 pub struct LumeProvider {
-    pub rpc_handler: JsValue,
+    pub rpc_handler: Arc<JsValue>,
 }
 
 impl LumeProvider {
-    pub fn new(rpc_handler: JsValue) -> Self {
+    pub fn new(rpc_handler: Arc<JsValue>) -> Self {
         LumeProvider { rpc_handler }
     }
 }
 
+#[async_trait]
+#[cfg_attr(target_arch = "wasm32", async_trait(?Send))]
 impl JsonRpcClient for LumeProvider {
     type Error = LumeError;
 
@@ -98,11 +101,9 @@ impl JsonRpcClient for LumeProvider {
     }
 }
 
-#[cfg_attr(not(target_arch = "wasm32"), async_trait)]
-#[cfg_attr(target_arch = "wasm32", async_trait(?Send))]
+#[async_trait(?Send)]
 impl ExecutionRpc for HttpRpc {
-    fn new(rpc_handler: wasm_bindgen::JsValue) -> Result<Self> {
-        let http = Http::from_str(rpc)?;
+    fn new(rpc_handler: Arc<JsValue>) -> Result<Self> {
         let mut client = LumeProvider::new(rpc_handler.clone());
         let provider = Provider::new(client);
 
diff --git a/helios-ts/Cargo.toml b/helios-ts/Cargo.toml
index bd9fe42..143ec93 100644
--- a/helios-ts/Cargo.toml
+++ b/helios-ts/Cargo.toml
@@ -1,3 +1,6 @@
+[build]
+target = "wasm32-unknown-unknown"
+
 [package]
 name = "helios-ts"
 version = "0.1.0"
@@ -13,11 +16,12 @@ wasm-bindgen = "0.2.84"
 wasm-bindgen-futures = "0.4.33"
 serde-wasm-bindgen = "0.4.5"
 console_error_panic_hook = "0.1.7"
+futures = "0.3"
+serde = { version = "1.0.85", features = ["derive"] }
 
 ethers = "1.0.0"
 hex = "0.4.3"
-serde = { version = "1.0.143", features = ["derive"] }
-serde_json = "1.0.85"
+
 
 client = { path = "../client" }
 common = { path = "../common" }
diff --git a/helios-ts/src/lib.rs b/helios-ts/src/lib.rs
index df8f436..a7936aa 100644
--- a/helios-ts/src/lib.rs
+++ b/helios-ts/src/lib.rs
@@ -2,6 +2,7 @@ extern crate console_error_panic_hook;
 extern crate web_sys;
 
 use std::str::FromStr;
+use std::sync::Arc;
 
 use common::types::BlockTag;
 use ethers::types::{Address, Filter, H256};
@@ -39,6 +40,9 @@ impl Client {
 
         let chain_id = base.chain.chain_id;
 
+        let execution_rpc = Arc::new(execution_rpc);
+        let consensus_rpc = Arc::new(consensus_rpc);
+
         let checkpoint = Some(
             checkpoint
                 .as_ref()