fix: SDK non-null guards + router fetch timeout

core/src/exchanges/polymarket_us/websocket.ts

@@ -75,8 +75,11 @@ export class PolymarketUSWebSocket {
         await this.ensureInitialized();
 
         if (!this.bookSubscriptions.has(slug)) {
+            if (!this.socket) {
+                throw new Error('[polymarket_us] Socket not available after connect');
+            }
             this.bookSubscriptions.add(slug);
-            this.socket!.subscribeMarketData(`book:${slug}`, [slug]);
+            this.socket.subscribeMarketData(`book:${slug}`, [slug]);
         }
 
         const dataPromise = new Promise<OrderBook>((resolve, reject) => {
@@ -97,8 +100,11 @@ export class PolymarketUSWebSocket {
         await this.ensureInitialized();
 
         if (!this.tradeSubscriptions.has(slug)) {
+            if (!this.socket) {
+                throw new Error('[polymarket_us] Socket not available after connect');
+            }
             this.tradeSubscriptions.add(slug);
-            this.socket!.subscribeTrades(`trade:${slug}`, [slug]);
+            this.socket.subscribeTrades(`trade:${slug}`, [slug]);
         }
 
         const dataPromise = new Promise<Trade[]>((resolve, reject) => {

sdks/typescript/pmxt/router.ts

@@ -297,6 +297,7 @@ export class Router extends Exchange {
                 method: 'POST',
                 headers: { 'Content-Type': 'application/json', ...this.getAuthHeaders() },
                 body: JSON.stringify({ args: [query], credentials: this.getCredentials() }),
+                signal: AbortSignal.timeout(30_000),
             });
             if (!response.ok) {
                 const body = await response.json().catch(() => ({}));

sdks/typescript/pmxt/ws-client.ts

@@ -240,7 +240,10 @@ export class SidecarWsClient {
             message.credentials = credentials;
         }
 
-        this.ws!.send(JSON.stringify(message));
+        if (!this.ws) {
+            throw new PmxtError('[ws-client] Cannot send: WebSocket not connected');
+        }
+        this.ws.send(JSON.stringify(message));
 
         return this.waitForData(requestId, timeoutMs);
     }
@@ -278,7 +281,10 @@ export class SidecarWsClient {
             message.credentials = credentials;
         }
 
-        this.ws!.send(JSON.stringify(message));
+        if (!this.ws) {
+            throw new PmxtError('[ws-client] Cannot send: WebSocket not connected');
+        }
+        this.ws.send(JSON.stringify(message));
 
         // Wait for first data event
         await this.waitForData(requestId, timeoutMs);