diff --git a/core/src/exchanges/kalshi/normalizer.ts b/core/src/exchanges/kalshi/normalizer.ts
index 3a837d64..eaf23f82 100644
--- a/core/src/exchanges/kalshi/normalizer.ts
+++ b/core/src/exchanges/kalshi/normalizer.ts
@@ -288,8 +288,8 @@ export class KalshiNormalizer implements IExchangeNormalizer<KalshiRawEvent, Kal
 
     private deriveEventDescription(markets: any[]): string {
         const texts = markets
-            .map((m) => m.rules_primary as string)
-            .filter((t) => typeof t === 'string' && t.length > 0);
+            .map((m) => m.rules_primary)
+            .filter((t): t is string => typeof t === 'string' && t.length > 0);
 
         if (texts.length === 0) return '';
         if (texts.length === 1) return texts[0];
diff --git a/core/src/exchanges/limitless/utils.ts b/core/src/exchanges/limitless/utils.ts
index 8521a073..920d2430 100644
--- a/core/src/exchanges/limitless/utils.ts
+++ b/core/src/exchanges/limitless/utils.ts
@@ -14,25 +14,29 @@ export function mapMarketToUnified(market: any): UnifiedMarket | null {
     // Use explicit key lookup — Object.entries order is not guaranteed to
     // match the prices array.
     if (market.tokens) {
+        if (!market.tokens.yes || !market.tokens.no) {
+            throw new Error(`[limitless] Market "${market.slug}" is missing token addresses`);
+        }
+
         const prices = Array.isArray(market.prices) ? market.prices : [];
         const yesPrice = prices[0] || 0;
         const noPrice = prices[1] || 0;
 
         outcomes.push({
-            outcomeId: market.tokens.yes as string,
+            outcomeId: market.tokens.yes,
             marketId: market.slug,
             label: 'Yes',
             price: yesPrice,
             priceChange24h: 0,
-            metadata: { clobTokenId: market.tokens.yes as string },
+            metadata: { clobTokenId: market.tokens.yes },
         });
         outcomes.push({
-            outcomeId: market.tokens.no as string,
+            outcomeId: market.tokens.no,
             marketId: market.slug,
             label: 'No',
             price: noPrice,
             priceChange24h: 0,
-            metadata: { clobTokenId: market.tokens.no as string },
+            metadata: { clobTokenId: market.tokens.no },
         });
     }
 
diff --git a/core/src/subscriber/external/goldsky.ts b/core/src/subscriber/external/goldsky.ts
index 419aedf2..daf3c2f1 100644
--- a/core/src/subscriber/external/goldsky.ts
+++ b/core/src/subscriber/external/goldsky.ts
@@ -191,7 +191,7 @@ export const buildPolymarketTradesActivity: SubscribedActivityBuilder = (data, a
 
     const addr = address.toLowerCase();
     const trades: Trade[] = filled.map((f: any): Trade => {
-        const isMaker = (f.maker as string)?.toLowerCase() === addr;
+        const isMaker = f.maker?.toLowerCase() === addr;
         const currAssetId = BigInt(isMaker ? f.makerAssetId : f.takerAssetId);
         const isBuying = currAssetId === 0n;
 
@@ -253,7 +253,7 @@ export const buildLimitlessBalanceActivity: SubscribedActivityBuilder = (data, a
 
     const t = transfers[0];
     const addr = address.toLowerCase();
-    const isIncoming = (t.to as string)?.toLowerCase() === addr;
+    const isIncoming = t.to?.toLowerCase() === addr;
     const delta = parseFloat(t.value) / 1e6;
     const newTotal = Math.max(0, isIncoming ? prev.total + delta : prev.total - delta);