diff --git a/Cargo.lock b/Cargo.lock
index 1992e79a94a..51b391b5633 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1408,15 +1408,28 @@ name = "apollo_l1_endpoint_monitor"
 version = "0.15.0-rc.2"
 dependencies = [
  "alloy",
+ "apollo_l1_endpoint_monitor_types",
  "mockito 1.6.1",
  "papyrus_base_layer",
  "serde",
- "thiserror 1.0.69",
  "tokio",
  "tracing",
  "url",
 ]
 
+[[package]]
+name = "apollo_l1_endpoint_monitor_types"
+version = "0.15.0-rc.2"
+dependencies = [
+ "apollo_infra",
+ "async-trait",
+ "mockall",
+ "serde",
+ "strum_macros 0.25.3",
+ "thiserror 1.0.69",
+ "url",
+]
+
 [[package]]
 name = "apollo_l1_gas_price"
 version = "0.15.0-rc.2"
diff --git a/Cargo.toml b/Cargo.toml
index 84595ac3568..e79eba80b23 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -26,6 +26,7 @@ members = [
   "crates/apollo_infra_utils",
   "crates/apollo_integration_tests",
   "crates/apollo_l1_endpoint_monitor",
+  "crates/apollo_l1_endpoint_monitor_types",
   "crates/apollo_l1_gas_price",
   "crates/apollo_l1_gas_price_types",
   "crates/apollo_l1_provider",
@@ -109,6 +110,7 @@ apollo_infra.path = "crates/apollo_infra"
 apollo_infra_utils = { path = "crates/apollo_infra_utils", version = "0.15.0-rc.2" }
 apollo_integration_tests.path = "crates/apollo_integration_tests"
 apollo_l1_endpoint_monitor.path = "crates/apollo_l1_endpoint_monitor"
+apollo_l1_endpoint_monitor_types.path = "crates/apollo_l1_endpoint_monitor_types"
 apollo_l1_gas_price.path = "crates/apollo_l1_gas_price"
 apollo_l1_gas_price_types.path = "crates/apollo_l1_gas_price_types"
 apollo_l1_provider.path = "crates/apollo_l1_provider"
diff --git a/crates/apollo_l1_endpoint_monitor/Cargo.toml b/crates/apollo_l1_endpoint_monitor/Cargo.toml
index 62fb631de2b..6679b3cf912 100644
--- a/crates/apollo_l1_endpoint_monitor/Cargo.toml
+++ b/crates/apollo_l1_endpoint_monitor/Cargo.toml
@@ -7,8 +7,8 @@ license.workspace = true
 
 [dependencies]
 alloy.workspace = true
+apollo_l1_endpoint_monitor_types.workspace = true
 serde.workspace = true
-thiserror.workspace = true
 tracing.workspace = true
 url = { workspace = true, features = ["serde"] }
 
diff --git a/crates/apollo_l1_endpoint_monitor/src/monitor.rs b/crates/apollo_l1_endpoint_monitor/src/monitor.rs
index 290c5309d26..a6025ad05e1 100644
--- a/crates/apollo_l1_endpoint_monitor/src/monitor.rs
+++ b/crates/apollo_l1_endpoint_monitor/src/monitor.rs
@@ -1,7 +1,7 @@
 use alloy::primitives::U64;
 use alloy::providers::{Provider, ProviderBuilder};
+use apollo_l1_endpoint_monitor_types::{L1EndpointMonitorError, L1EndpointMonitorResult};
 use serde::{Deserialize, Serialize};
-use thiserror::Error;
 use tracing::{error, warn};
 use url::Url;
 
@@ -9,8 +9,6 @@ use url::Url;
 #[path = "l1_endpoint_monitor_tests.rs"]
 pub mod l1_endpoint_monitor_tests;
 
-type L1EndpointMonitorResult<T> = Result<T, L1EndpointMonitorError>;
-
 /// The JSON-RPC method used to check L1 endpoint health.
 // Note: is this fast enough? Alternatively, we can just check connectivity, but we already hit
 // a bug in infura where the connectivity was fine, but get_block_number() failed.
@@ -72,9 +70,3 @@ impl L1EndpointMonitor {
 pub struct L1EndpointMonitorConfig {
     pub ordered_l1_endpoint_urls: Vec<Url>,
 }
-
-#[derive(Debug, Clone, Error, Serialize, Deserialize, PartialEq, Eq)]
-pub enum L1EndpointMonitorError {
-    #[error("All L1 endpoints are non-operational")]
-    NoActiveL1Endpoint,
-}
diff --git a/crates/apollo_l1_endpoint_monitor/tests/happy_flow.rs b/crates/apollo_l1_endpoint_monitor/tests/happy_flow.rs
index 222aa5d70ad..c9786e2db63 100644
--- a/crates/apollo_l1_endpoint_monitor/tests/happy_flow.rs
+++ b/crates/apollo_l1_endpoint_monitor/tests/happy_flow.rs
@@ -1,8 +1,5 @@
-use apollo_l1_endpoint_monitor::monitor::{
-    L1EndpointMonitor,
-    L1EndpointMonitorConfig,
-    L1EndpointMonitorError,
-};
+use apollo_l1_endpoint_monitor::monitor::{L1EndpointMonitor, L1EndpointMonitorConfig};
+use apollo_l1_endpoint_monitor_types::L1EndpointMonitorError;
 use papyrus_base_layer::test_utils::anvil;
 use url::Url;
 
diff --git a/crates/apollo_l1_endpoint_monitor_types/Cargo.toml b/crates/apollo_l1_endpoint_monitor_types/Cargo.toml
new file mode 100644
index 00000000000..a86f25411c4
--- /dev/null
+++ b/crates/apollo_l1_endpoint_monitor_types/Cargo.toml
@@ -0,0 +1,24 @@
+[package]
+name = "apollo_l1_endpoint_monitor_types"
+version.workspace = true
+edition.workspace = true
+repository.workspace = true
+license.workspace = true
+
+[features]
+testing = ["mockall"]
+
+[dependencies]
+apollo_infra.workspace = true
+async-trait.workspace = true
+mockall = { workspace = true, optional = true }
+serde.workspace = true
+strum_macros.workspace = true
+thiserror.workspace = true
+url = { workspace = true, features = ["serde"] }
+
+[dev-dependencies]
+mockall.workspace = true
+
+[lints]
+workspace = true
diff --git a/crates/apollo_l1_endpoint_monitor_types/src/lib.rs b/crates/apollo_l1_endpoint_monitor_types/src/lib.rs
new file mode 100644
index 00000000000..ab1b0180e83
--- /dev/null
+++ b/crates/apollo_l1_endpoint_monitor_types/src/lib.rs
@@ -0,0 +1,42 @@
+use std::sync::Arc;
+
+use apollo_infra::component_client::ClientError;
+use async_trait::async_trait;
+use serde::{Deserialize, Serialize};
+use strum_macros::AsRefStr;
+use thiserror::Error;
+use url::Url;
+
+pub type L1EndpointMonitorResult<T> = Result<T, L1EndpointMonitorError>;
+pub type L1EndpointMonitorClientResult<T> = Result<T, L1EndpointMonitorClientError>;
+pub type SharedL1EndpointMonitorClient = Arc<dyn L1EndpointMonitorClient>;
+
+#[cfg_attr(any(feature = "testing", test), mockall::automock)]
+#[async_trait]
+pub trait L1EndpointMonitorClient: Send + Sync {
+    async fn get_active_l1_endpoint(&self) -> L1EndpointMonitorClientResult<Url>;
+}
+
+#[derive(Clone, Serialize, Deserialize, AsRefStr)]
+pub enum L1EndpointMonitorRequest {
+    GetActiveL1Endpoint(),
+}
+
+#[derive(Clone, Serialize, Deserialize, AsRefStr)]
+pub enum L1EndpointMonitorResponse {
+    GetActiveL1Endpoint(L1EndpointMonitorResult<Url>),
+}
+
+#[derive(Debug, Clone, Error, Serialize, Deserialize, PartialEq, Eq)]
+pub enum L1EndpointMonitorError {
+    #[error("All L1 endpoints are non-operational")]
+    NoActiveL1Endpoint,
+}
+
+#[derive(Clone, Debug, Error)]
+pub enum L1EndpointMonitorClientError {
+    #[error(transparent)]
+    ClientError(#[from] ClientError),
+    #[error(transparent)]
+    L1EndpointMonitorError(#[from] L1EndpointMonitorError),
+}