diff --git a/src/main.rs b/src/main.rs
index 0e86b11..260c885 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -5,6 +5,7 @@ mod health;
 mod html;
 mod irc_task;
 mod owncast_api;
+mod router;
 mod webhook;
 mod websocket;
 
diff --git a/src/router.rs b/src/router.rs
new file mode 100644
index 0000000..862e5aa
--- /dev/null
+++ b/src/router.rs
@@ -0,0 +1,236 @@
+use std::collections::{HashSet, VecDeque};
+use std::time::Instant;
+
+use tokio::sync::mpsc;
+use tracing::{info, warn};
+
+use crate::config::BridgeSettings;
+use crate::events::{BridgeEvent, ControlCommand, OwncastState, Source};
+use crate::owncast_api::OwncastApiClient;
+
+pub struct DedupTracker {
+    seen: VecDeque<String>,
+    set: HashSet<String>,
+    capacity: usize,
+}
+
+impl DedupTracker {
+    pub fn new(capacity: usize) -> Self {
+        Self {
+            seen: VecDeque::with_capacity(capacity),
+            set: HashSet::with_capacity(capacity),
+            capacity,
+        }
+    }
+
+    pub fn is_duplicate(&mut self, id: &str) -> bool {
+        if self.set.contains(id) {
+            return true;
+        }
+        if self.seen.len() >= self.capacity {
+            if let Some(old) = self.seen.pop_front() {
+                self.set.remove(&old);
+            }
+        }
+        self.set.insert(id.to_string());
+        self.seen.push_back(id.to_string());
+        false
+    }
+}
+
+pub struct EchoSuppressor {
+    recent: VecDeque<String>,
+    capacity: usize,
+}
+
+impl EchoSuppressor {
+    pub fn new(capacity: usize) -> Self {
+        Self {
+            recent: VecDeque::with_capacity(capacity),
+            capacity,
+        }
+    }
+
+    pub fn record_sent(&mut self, body: &str) {
+        if self.recent.len() >= self.capacity {
+            self.recent.pop_front();
+        }
+        self.recent.push_back(body.to_string());
+    }
+
+    pub fn is_echo(&mut self, body: &str) -> bool {
+        if let Some(pos) = self.recent.iter().position(|s| s == body) {
+            self.recent.remove(pos);
+            true
+        } else {
+            false
+        }
+    }
+}
+
+pub async fn run_router(
+    settings: BridgeSettings,
+    owncast_url: String,
+    api_client: OwncastApiClient,
+    mut event_rx: mpsc::Receiver<BridgeEvent>,
+    irc_outbound_tx: mpsc::Sender<String>,
+    mut state_rx: mpsc::Receiver<OwncastState>,
+    mut control_rx: mpsc::Receiver<ControlCommand>,
+    shutdown_tx: tokio::sync::watch::Sender<bool>,
+    start_time: Instant,
+) {
+    let mut dedup = DedupTracker::new(500);
+    let mut echo_suppressor = EchoSuppressor::new(50);
+    let mut owncast_state = OwncastState::Unavailable;
+
+    loop {
+        tokio::select! {
+            Some(event) = event_rx.recv() => {
+                handle_event(
+                    event,
+                    &settings,
+                    &owncast_url,
+                    &api_client,
+                    &irc_outbound_tx,
+                    &mut dedup,
+                    &mut echo_suppressor,
+                    &owncast_state,
+                ).await;
+            }
+            Some(new_state) = state_rx.recv() => {
+                if new_state != owncast_state {
+                    handle_state_change(&new_state, &owncast_state, &irc_outbound_tx).await;
+                    owncast_state = new_state;
+                }
+            }
+            Some(cmd) = control_rx.recv() => {
+                match cmd {
+                    ControlCommand::Quit => {
+                        info!("Quit command received, shutting down");
+                        let _ = shutdown_tx.send(true);
+                        return;
+                    }
+                    ControlCommand::Status { reply } => {
+                        let status = crate::events::BridgeStatus {
+                            irc_connected: true,
+                            owncast_state: format!("{:?}", owncast_state),
+                            webhook_listening: true,
+                            websocket_connected: false,
+                            uptime_secs: start_time.elapsed().as_secs(),
+                        };
+                        let _ = reply.send(status);
+                    }
+                    other => {
+                        warn!(command = ?other, "Control command not yet implemented in router");
+                    }
+                }
+            }
+            else => break,
+        }
+    }
+}
+
+async fn handle_event(
+    event: BridgeEvent,
+    settings: &BridgeSettings,
+    owncast_url: &str,
+    api_client: &OwncastApiClient,
+    irc_tx: &mpsc::Sender<String>,
+    dedup: &mut DedupTracker,
+    echo: &mut EchoSuppressor,
+    owncast_state: &OwncastState,
+) {
+    match event {
+        BridgeEvent::ChatMessage { source, username, body, id } => {
+            if let Some(ref msg_id) = id {
+                if dedup.is_duplicate(msg_id) {
+                    return;
+                }
+            }
+
+            match source {
+                Source::Irc => {
+                    if *owncast_state == OwncastState::Unavailable {
+                        return;
+                    }
+                    let formatted = format!("{} <{}> {}", settings.irc_prefix, username, body);
+                    echo.record_sent(&formatted);
+                    if let Err(e) = api_client.send_chat_message(&formatted).await {
+                        warn!(error = %e, "Failed to send to Owncast");
+                    }
+                }
+                Source::Owncast => {
+                    let formatted = format!("{} <{}> {}", settings.owncast_prefix, username, body);
+                    if echo.is_echo(&body) {
+                        return;
+                    }
+                    if irc_tx.send(formatted).await.is_err() {
+                        warn!("IRC outbound channel closed");
+                    }
+                }
+            }
+        }
+        BridgeEvent::StreamStarted { title } => {
+            let msg = if title.is_empty() {
+                format!("Stream started — {}", owncast_url)
+            } else {
+                format!("Stream started: {} — {}", title, owncast_url)
+            };
+            let _ = irc_tx.send(msg).await;
+        }
+        BridgeEvent::StreamStopped => {
+            let _ = irc_tx.send("Stream ended.".to_string()).await;
+        }
+    }
+}
+
+async fn handle_state_change(
+    new: &OwncastState,
+    _old: &OwncastState,
+    irc_tx: &mpsc::Sender<String>,
+) {
+    match new {
+        OwncastState::Online => {
+            let _ = irc_tx.send("Owncast chat is now available.".to_string()).await;
+        }
+        OwncastState::Unavailable => {
+            let _ = irc_tx.send("Owncast chat is currently unavailable.".to_string()).await;
+        }
+        OwncastState::OfflineChatOpen => {}
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_dedup_tracker_new_id() {
+        let mut tracker = DedupTracker::new(100);
+        assert!(!tracker.is_duplicate("msg-1"));
+    }
+
+    #[test]
+    fn test_dedup_tracker_duplicate() {
+        let mut tracker = DedupTracker::new(100);
+        assert!(!tracker.is_duplicate("msg-1"));
+        assert!(tracker.is_duplicate("msg-1"));
+    }
+
+    #[test]
+    fn test_dedup_tracker_evicts_old() {
+        let mut tracker = DedupTracker::new(2);
+        tracker.is_duplicate("a");
+        tracker.is_duplicate("b");
+        tracker.is_duplicate("c");
+        assert!(!tracker.is_duplicate("a"));
+    }
+
+    #[test]
+    fn test_echo_suppressor() {
+        let mut suppressor = EchoSuppressor::new(10);
+        suppressor.record_sent("hello from IRC");
+        assert!(suppressor.is_echo("hello from IRC"));
+        assert!(!suppressor.is_echo("different message"));
+    }
+}