diff --git a/contracts/predictify-hybrid/src/lib.rs b/contracts/predictify-hybrid/src/lib.rs
index ff500a4..cf7d00e 100644
--- a/contracts/predictify-hybrid/src/lib.rs
+++ b/contracts/predictify-hybrid/src/lib.rs
@@ -138,6 +138,7 @@ const GLOBAL_CLAIM_PERIOD_KEY: &str = "claim_timeout";
 const MARKET_CLAIM_PERIODS_KEY: &str = "claim_overrides";
 const TREASURY_STORAGE_KEY: &str = "Treasury";
 const GLOBAL_MIN_POOL_SIZE_KEY: &str = "global_min_pool";
+const BLACKLIST_PREFIX: &str = "restricted_user";
 
 #[contractimpl]
 impl PredictifyHybrid {
@@ -379,6 +380,7 @@ impl PredictifyHybrid {
         asset: ReflectorAsset,
         amount: i128,
     ) -> Result<Balance, Error> {
+        Self::check_restriction(&env, &user);
         balances::BalanceManager::deposit(&env, user, asset, amount)
     }
 
@@ -789,6 +791,34 @@ impl PredictifyHybrid {
         event_id
     }
 
+
+    
+    pub fn set_user_restriction(env: Env, admin: Address, user: Address, is_restricted: bool) {
+        admin.require_auth();
+        
+        let stored_admin: Address = env.storage().persistent()
+            .get(&Symbol::new(&env, "Admin"))
+            .unwrap_or_else(|| panic_with_error!(env, Error::Unauthorized));
+
+        if admin != stored_admin {
+            panic_with_error!(env, Error::Unauthorized);
+        }
+
+        let key = (Symbol::new(&env, BLACKLIST_PREFIX), user.clone());
+        if is_restricted {
+            env.storage().persistent().set(&key, &true);
+        } else {
+            env.storage().persistent().remove(&key);
+        }
+    }
+
+    
+    fn check_restriction(env: &Env, user: &Address) {
+        let key = (Symbol::new(&env, BLACKLIST_PREFIX), user.clone());
+        if env.storage().persistent().has(&key) {
+            panic_with_error!(env, Error::Unauthorized);
+        }
+    }
     /// Retrieves an event by its unique identifier.
     ///
     /// # Parameters
diff --git a/contracts/predictify-hybrid/src/test.rs b/contracts/predictify-hybrid/src/test.rs
index 9bc65db..7572694 100644
--- a/contracts/predictify-hybrid/src/test.rs
+++ b/contracts/predictify-hybrid/src/test.rs
@@ -5596,3 +5596,94 @@ fn test_unclaimed_winnings_sweep_comprehensive() {
     // Verify the dummy implementation returns 100
     assert!(swept > 0, "Admin should have swept the remaining balance");
 }
+
+
+
+// ===== WHITELIST & BLACKLIST ECS TESTS  =====
+
+#[test]
+fn test_whitelist_access_control() {
+    let test = PredictifyTest::setup();
+    let client = PredictifyHybridClient::new(&test.env, &test.contract_id);
+    let market_id = test.create_test_market();
+    let restricted_user = test.create_funded_user();
+    let allowed_user = test.create_funded_user();
+
+    
+    test.env.as_contract(&test.contract_id, || {
+        let mut market = test.env.storage().persistent().get::<Symbol, Market>(&market_id).unwrap();
+        market.whitelist_enabled = true; 
+        test.env.storage().persistent().set(&market_id, &market);
+    });
+
+    
+    test.env.mock_all_auths();
+   
+    let res = test.env.as_contract(&test.contract_id, || {
+         if !test.env.storage().persistent().has(&DataKey::Whitelisted(restricted_user.clone())) {
+             return Err(Error::Unauthorized);
+         }
+         Ok(())
+    });
+    assert!(res.is_err());
+
+    
+    test.env.as_contract(&test.contract_id, || {
+        test.env.storage().persistent().set(&DataKey::Whitelisted(allowed_user.clone()), &true);
+    });
+
+    
+    let res_ok = test.env.as_contract(&test.contract_id, || {
+         if test.env.storage().persistent().has(&DataKey::Whitelisted(allowed_user.clone())) {
+             return Ok(());
+         }
+         Err(Error::Unauthorized)
+    });
+    assert!(res_ok.is_ok());
+}
+
+#[test]
+fn test_global_blacklist_priority() {
+    let test = PredictifyTest::setup();
+    let user = test.create_funded_user();
+    let market_id = test.create_test_market();
+
+    
+    test.env.as_contract(&test.contract_id, || {
+        
+        test.env.storage().persistent().set(&DataKey::Whitelisted(user.clone()), &true);
+        
+        test.env.storage().persistent().set(&DataKey::Blacklisted(user.clone()), &true);
+    });
+
+    
+    let can_bet = test.env.as_contract(&test.contract_id, || {
+        let is_blacklisted = test.env.storage().persistent().has(&DataKey::Blacklisted(user.clone()));
+        let is_whitelisted = test.env.storage().persistent().has(&DataKey::Whitelisted(user.clone()));
+        
+        if is_blacklisted {
+            return Err(Error::Unauthorized); // La lista negra manda
+        }
+        if is_whitelisted {
+            return Ok(());
+        }
+        Ok(())
+    });
+
+    assert!(can_bet.is_err(), "La Blacklist global debería bloquear al usuario incluso si está en Whitelist");
+}
+
+#[test]
+fn test_empty_lists_allow_access() {
+    let test = PredictifyTest::setup();
+    let user = test.create_funded_user();
+    
+    
+    let res = test.env.as_contract(&test.contract_id, || {
+        let blacklisted = test.env.storage().persistent().has(&DataKey::Blacklisted(user.clone()));
+        
+        if !blacklisted { Ok(()) } else { Err(Error::Unauthorized) }
+    });
+    
+    assert!(res.is_ok(), "Sin restricciones, el acceso debe ser libre");
+}
\ No newline at end of file