diff --git a/crates/jstz_node/openapi.json b/crates/jstz_node/openapi.json
index e522e7c25..1af175241 100644
--- a/crates/jstz_node/openapi.json
+++ b/crates/jstz_node/openapi.json
@@ -378,6 +378,43 @@
         }
       }
     },
+    "/operations/hash": {
+      "post": {
+        "tags": [
+          "Operations"
+        ],
+        "summary": "Returns the hash of an Operation",
+        "operationId": "hash_operation",
+        "requestBody": {
+          "content": {
+            "application/json": {
+              "schema": {
+                "$ref": "#/components/schemas/Operation"
+              }
+            }
+          },
+          "required": true
+        },
+        "responses": {
+          "200": {
+            "description": "",
+            "content": {
+              "application/json": {
+                "schema": {
+                  "$ref": "#/components/schemas/Blake2b"
+                }
+              }
+            }
+          },
+          "400": {
+            "description": ""
+          },
+          "500": {
+            "description": ""
+          }
+        }
+      }
+    },
     "/operations/{operation_hash}/receipt": {
       "get": {
         "tags": [
diff --git a/crates/jstz_node/src/services/operations.rs b/crates/jstz_node/src/services/operations.rs
index 16c999254..0187aaa73 100644
--- a/crates/jstz_node/src/services/operations.rs
+++ b/crates/jstz_node/src/services/operations.rs
@@ -5,7 +5,7 @@ use axum::{
     extract::{Path, State},
     Json,
 };
-use jstz_proto::operation::SignedOperation;
+use jstz_proto::operation::{Operation, OperationHash, SignedOperation};
 use jstz_proto::receipt::Receipt;
 use tezos_data_encoding::enc::BinWriter;
 use tezos_smart_rollup::inbox::ExternalMessageFrame;
@@ -78,11 +78,29 @@ async fn receipt(
     Ok(Json(receipt))
 }
 
+/// Returns the hash of an Operation
+#[utoipa::path(
+        post,
+        path = "/hash",
+        tag = OPERATIONS_TAG,
+        responses(
+            (status = 200, body = OperationHash),
+            (status = 400),
+            (status = 500)
+        )
+    )]
+async fn hash_operation(
+    Json(operation): Json<Operation>,
+) -> ServiceResult<Json<OperationHash>> {
+    Ok(Json(operation.hash()))
+}
+
 impl Service for OperationsService {
     fn router_with_openapi() -> OpenApiRouter<AppState> {
         let routes = OpenApiRouter::new()
             .routes(routes!(inject))
-            .routes(routes!(receipt));
+            .routes(routes!(receipt))
+            .routes(routes!(hash_operation));
 
         OpenApiRouter::new().nest("/operations", routes)
     }