diff --git a/.gitignore b/.gitignore
index 1f06397..80e2861 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,6 +1,5 @@
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+dependencies = [
+ "windows-link",
+]
+
+[[package]]
+name = "windows-strings"
+version = "0.5.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7837d08f69c77cf6b07689544538e017c1bfcf57e34b4c0ff58e6c2cd3b37091"
+dependencies = [
+ "windows-link",
+]
+
+[[package]]
+name = "zerocopy"
+version = "0.8.54"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b7cbbc0a705a0fd05cc3676525980d2bf5a9bc4adac6d6475209a7887cf59d19"
+dependencies = [
+ "zerocopy-derive",
+]
+
+[[package]]
+name = "zerocopy-derive"
+version = "0.8.54"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e2e817b7b52d0c7358d3246da9d69935ebb18116b2b102b4230dac079b4862f5"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
+[[package]]
+name = "zeroize"
+version = "1.9.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e13c156562582aa81c60cb29407084cdb54c4164760106ab78e6c5b0858cf64e"
+dependencies = [
+ "zeroize_derive",
+]
+
+[[package]]
+name = "zeroize_derive"
+version = "1.5.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3c50655cbb0fe3fc43170059e702f1ce5e19b84cec58dc87b037a09935c2f328"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
+[[package]]
+name = "zmij"
+version = "1.0.21"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b8848ee67ecc8aedbaf3e4122217aff892639231befc6a1b58d29fff4c2cabaa"
diff --git a/src/errors.rs b/src/errors.rs
index 8d67821..b714a51 100644
--- a/src/errors.rs
+++ b/src/errors.rs
@@ -20,4 +20,5 @@ pub enum Error {
     NotInitialized = 14,
     SlippageTooHigh = 15,
     Unauthorized = 16,
+    ContractPaused = 17,
 }
diff --git a/src/events.rs b/src/events.rs
index 19c90c9..448e8a4 100644
--- a/src/events.rs
+++ b/src/events.rs
@@ -32,6 +32,16 @@ pub struct SyncEvent {
     pub reserve_1: i128,
 }
 
+#[contracttype]
+pub struct PausedEvent {
+    pub caller: Address,
+}
+
+#[contracttype]
+pub struct UnpausedEvent {
+    pub caller: Address,
+}
+
 /// Emits a mint event.
 ///
 /// Topic includes the emitting contract's address (`env.current_contract_address()`)
@@ -110,6 +120,22 @@ pub fn emit_sync(env: &Env, reserve_0: i128, reserve_1: i128) {
     );
 }
 
+/// Emits a paused event. See [`emit_mint`] for the multi-pool indexing rationale.
+pub fn emit_paused(env: &Env, caller: Address) {
+    env.events().publish(
+        (symbol_short!("v1_pause"), env.current_contract_address()),
+        PausedEvent { caller },
+    );
+}
+
+/// Emits an unpaused event. See [`emit_mint`] for the multi-pool indexing rationale.
+pub fn emit_unpaused(env: &Env, caller: Address) {
+    env.events().publish(
+        (symbol_short!("v1_unpau"), env.current_contract_address()),
+        UnpausedEvent { caller },
+    );
+}
+
 #[cfg(test)]
 mod tests {
     use super::*;
diff --git a/src/lib.rs b/src/lib.rs
index 030c65b..ab0753f 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -49,6 +49,33 @@ fn get_timestamp_last(env: &Env) -> u64 {
         .unwrap_or(0)
 }
 
+fn is_paused(env: &Env) -> bool {
+    env.storage()
+        .instance()
+        .get(&DataKey::Paused)
+        .unwrap_or(false)
+}
+
+fn require_not_paused(env: &Env) -> Result<(), Error> {
+    if is_paused(env) {
+        return Err(Error::ContractPaused);
+    }
+    Ok(())
+}
+
+fn require_fee_to_setter(env: &Env, caller: &Address) -> Result<(), Error> {
+    caller.require_auth();
+    let setter: Address = env
+        .storage()
+        .instance()
+        .get(&DataKey::FeeToSetter)
+        .ok_or(Error::NotInitialized)?;
+    if *caller != setter {
+        return Err(Error::Unauthorized);
+    }
+    Ok(())
+}
+
 fn is_locked(env: &Env) -> bool {
     env.storage()
         .instance()
@@ -169,6 +196,7 @@ impl NodusAmm {
         deadline: u64,
     ) -> Result<i128, Error> {
         require_initialized(&env)?;
+        require_not_paused(&env)?;
         if env.ledger().timestamp() > deadline {
             return Err(Error::Expired);
         }
@@ -247,6 +275,7 @@ impl NodusAmm {
         deadline: u64,
     ) -> Result<(i128, i128), Error> {
         require_initialized(&env)?;
+        require_not_paused(&env)?;
         if env.ledger().timestamp() > deadline {
             return Err(Error::Expired);
         }
@@ -298,6 +327,7 @@ impl NodusAmm {
         amount_1_out: i128,
     ) -> Result<(), Error> {
         require_initialized(&env)?;
+        require_not_paused(&env)?;
         lock(&env)?;
         env.storage()
             .instance()
@@ -427,6 +457,7 @@ impl NodusAmm {
         deadline: u64,
     ) -> Result<i128, Error> {
         require_initialized(&env)?;
+        require_not_paused(&env)?;
         if env.ledger().timestamp() > deadline {
             return Err(Error::Expired);
         }
@@ -496,6 +527,7 @@ impl NodusAmm {
         deadline: u64,
     ) -> Result<i128, Error> {
         require_initialized(&env)?;
+        require_not_paused(&env)?;
         if env.ledger().timestamp() > deadline {
             return Err(Error::Expired);
         }
@@ -582,15 +614,7 @@ impl NodusAmm {
     // ── Protocol fee collector ──────────────────────────────────────────────
 
     pub fn set_fee_to(env: Env, caller: Address, new_fee_to: Option<Address>) -> Result<(), Error> {
-        caller.require_auth();
-        let setter: Address = env
-            .storage()
-            .instance()
-            .get(&DataKey::FeeToSetter)
-            .ok_or(Error::NotInitialized)?;
-        if caller != setter {
-            return Err(Error::Unauthorized);
-        }
+        require_fee_to_setter(&env, &caller)?;
         match &new_fee_to {
             Some(addr) => env.storage().instance().set(&DataKey::FeeTo, addr),
             None => env.storage().instance().remove(&DataKey::FeeTo),
@@ -599,15 +623,7 @@ impl NodusAmm {
     }
 
     pub fn set_fee_to_setter(env: Env, caller: Address, new_setter: Address) -> Result<(), Error> {
-        caller.require_auth();
-        let setter: Address = env
-            .storage()
-            .instance()
-            .get(&DataKey::FeeToSetter)
-            .ok_or(Error::NotInitialized)?;
-        if caller != setter {
-            return Err(Error::Unauthorized);
-        }
+        require_fee_to_setter(&env, &caller)?;
         env.storage()
             .instance()
             .set(&DataKey::FeeToSetter, &new_setter);
@@ -625,6 +641,31 @@ impl NodusAmm {
             .ok_or(Error::NotInitialized)
     }
 
+    // ── Emergency pause ──────────────────────────────────────────────────────
+
+    /// Halts add_liquidity, remove_liquidity, and all swap entrypoints.
+    /// Callable only by the fee_to_setter admin address.
+    pub fn pause(env: Env, caller: Address) -> Result<(), Error> {
+        require_initialized(&env)?;
+        require_fee_to_setter(&env, &caller)?;
+        env.storage().instance().set(&DataKey::Paused, &true);
+        events::emit_paused(&env, caller);
+        Ok(())
+    }
+
+    /// Resumes normal operation after a [`Self::pause`].
+    pub fn unpause(env: Env, caller: Address) -> Result<(), Error> {
+        require_initialized(&env)?;
+        require_fee_to_setter(&env, &caller)?;
+        env.storage().instance().set(&DataKey::Paused, &false);
+        events::emit_unpaused(&env, caller);
+        Ok(())
+    }
+
+    pub fn is_paused(env: Env) -> bool {
+        is_paused(&env)
+    }
+
     // ── LP token interface ──────────────────────────────────────────────────
 
     pub fn lp_balance_of(env: Env, owner: Address) -> i128 {
diff --git a/src/storage.rs b/src/storage.rs
index ec11d46..1657ed4 100644
--- a/src/storage.rs
+++ b/src/storage.rs
@@ -18,4 +18,5 @@ pub enum DataKey {
     Initialized,
     FeeTo,
     FeeToSetter,
+    Paused,
 }
diff --git a/tests/integration_tests.rs b/tests/integration_tests.rs
index 434cf0d..cac49c3 100644
--- a/tests/integration_tests.rs
+++ b/tests/integration_tests.rs
@@ -78,4 +78,153 @@ mod integration {
         assert!(client.try_token_0().is_err());
         assert!(client.try_token_1().is_err());
     }
+
+    fn setup_initialized_with_admin() -> (Env, Address, Address) {
+        let env = Env::default();
+        env.mock_all_auths();
+        let contract = env.register(NodusAmm, ());
+        let client = NodusAmmClient::new(&env, &contract);
+        let t0 = Address::generate(&env);
+        let t1 = Address::generate(&env);
+        let admin = Address::generate(&env);
+        client.initialize(&t0, &t1, &admin);
+        (env, contract, admin)
+    }
+
+    #[test]
+    fn contract_starts_unpaused() {
+        let (env, contract, _) = setup_initialized_with_admin();
+        let client = NodusAmmClient::new(&env, &contract);
+        assert!(!client.is_paused());
+    }
+
+    #[test]
+    fn admin_can_pause_and_unpause() {
+        let (env, contract, admin) = setup_initialized_with_admin();
+        let client = NodusAmmClient::new(&env, &contract);
+        client.pause(&admin);
+        assert!(client.is_paused());
+        client.unpause(&admin);
+        assert!(!client.is_paused());
+    }
+
+    #[test]
+    fn non_admin_cannot_pause() {
+        let (env, contract, _) = setup_initialized_with_admin();
+        let client = NodusAmmClient::new(&env, &contract);
+        let intruder = Address::generate(&env);
+        assert!(client.try_pause(&intruder).is_err());
+        assert!(!client.is_paused());
+    }
+
+    #[test]
+    fn non_admin_cannot_unpause() {
+        let (env, contract, admin) = setup_initialized_with_admin();
+        let client = NodusAmmClient::new(&env, &contract);
+        client.pause(&admin);
+        let intruder = Address::generate(&env);
+        assert!(client.try_unpause(&intruder).is_err());
+        assert!(client.is_paused());
+    }
+
+    #[test]
+    fn swap_rejected_while_paused() {
+        let (env, contract, admin) = setup_initialized_with_admin();
+        let client = NodusAmmClient::new(&env, &contract);
+        client.pause(&admin);
+        let to = Address::generate(&env);
+        assert_eq!(
+            client.try_swap(&to, &100, &0),
+            Err(Ok(nodus_protocol_amm::Error::ContractPaused))
+        );
+    }
+
+    #[test]
+    fn add_liquidity_rejected_while_paused() {
+        let (env, contract, admin) = setup_initialized_with_admin();
+        let client = NodusAmmClient::new(&env, &contract);
+        client.pause(&admin);
+        let from = Address::generate(&env);
+        let to = Address::generate(&env);
+        assert_eq!(
+            client.try_add_liquidity(&from, &to, &1_000, &1_000, &0, &0, &1_000_000_000),
+            Err(Ok(nodus_protocol_amm::Error::ContractPaused))
+        );
+    }
+
+    #[test]
+    fn remove_liquidity_rejected_while_paused() {
+        let (env, contract, admin) = setup_initialized_with_admin();
+        let client = NodusAmmClient::new(&env, &contract);
+        client.pause(&admin);
+        let from = Address::generate(&env);
+        let to = Address::generate(&env);
+        assert_eq!(
+            client.try_remove_liquidity(&from, &to, &100, &0, &0, &1_000_000_000),
+            Err(Ok(nodus_protocol_amm::Error::ContractPaused))
+        );
+    }
+
+    #[test]
+    fn swap_exact_tokens_for_tokens_rejected_while_paused() {
+        let (env, contract, admin) = setup_initialized_with_admin();
+        let client = NodusAmmClient::new(&env, &contract);
+        client.pause(&admin);
+        let from = Address::generate(&env);
+        let to = Address::generate(&env);
+        assert_eq!(
+            client.try_swap_exact_tokens_for_tokens(&from, &to, &100, &0, &true, &1_000_000_000),
+            Err(Ok(nodus_protocol_amm::Error::ContractPaused))
+        );
+    }
+
+    #[test]
+    fn swap_tokens_for_exact_tokens_rejected_while_paused() {
+        let (env, contract, admin) = setup_initialized_with_admin();
+        let client = NodusAmmClient::new(&env, &contract);
+        client.pause(&admin);
+        let from = Address::generate(&env);
+        let to = Address::generate(&env);
+        assert_eq!(
+            client.try_swap_tokens_for_exact_tokens(
+                &from,
+                &to,
+                &100,
+                &1_000_000,
+                &true,
+                &1_000_000_000
+            ),
+            Err(Ok(nodus_protocol_amm::Error::ContractPaused))
+        );
+    }
+
+    #[test]
+    fn unpause_restores_normal_operation() {
+        let (env, contract, admin) = setup_initialized_with_admin();
+        let client = NodusAmmClient::new(&env, &contract);
+        client.pause(&admin);
+        client.unpause(&admin);
+        let to = Address::generate(&env);
+        // No longer blocked by pause; fails for the ordinary reason (no reserves) instead.
+        assert_eq!(
+            client.try_swap(&to, &100, &0),
+            Err(Ok(nodus_protocol_amm::Error::InsufficientLiquidity))
+        );
+    }
+
+    #[test]
+    fn sync_is_not_blocked_by_pause() {
+        // sync() deliberately has no pause guard since it only reconciles
+        // reserves and never moves funds. It still fails here because t0/t1
+        // are bare addresses rather than deployed token contracts, but the
+        // failure must not be ContractPaused -- proving pause isn't what
+        // stopped it.
+        let (env, contract, admin) = setup_initialized_with_admin();
+        let client = NodusAmmClient::new(&env, &contract);
+        client.pause(&admin);
+        assert_ne!(
+            client.try_sync(),
+            Err(Ok(nodus_protocol_amm::Error::ContractPaused))
+        );
+    }
 }