From 83480c09248c5530b050a48624e8ba95dd21a200 Mon Sep 17 00:00:00 2001
From: Annie Weng <126124914+Anniew31@users.noreply.github.com>
Date: Sun, 19 Apr 2026 19:17:37 -0400
Subject: [PATCH] fix: add fallback when no feed data, arbitrage response
 aliases and volume field alias

---
 api/feed.ts              | 45 +++++++++++++++++++++++++++++++---------
 api/markets/arbitrage.ts | 10 ++++++++-
 src/types/market.ts      |  1 +
 3 files changed, 45 insertions(+), 11 deletions(-)

diff --git a/api/feed.ts b/api/feed.ts
index 4250c14..177312c 100644
--- a/api/feed.ts
+++ b/api/feed.ts
@@ -2,6 +2,7 @@ import type { VercelRequest, VercelResponse } from '@vercel/node';
 import type { AnalyzedTweet, FeedResponse, AccountCategory } from '../src/types/feed';
 import { batchGetFromKV, setFeedCache, getFeedCache, getFeedCacheTimestamp } from './lib/cache-helper';
 import { kv } from './lib/vercel-kv';
+import { getMarkets } from './lib/market-cache'
 
 // ─── KV Storage Keys ───────────────────────────────────────────────────────
 
@@ -129,18 +130,43 @@ export default async function handler(
 
     if (feedIndex.length === 0) {
       // Empty feed (not an error)
+      // Fall back to live market movers so the feed always returns something
+      const markets = await getMarkets();
+
+      const movingMarkets = markets
+        .filter(m => m.platform === 'polymarket')
+        .filter(m => Math.abs(m.oneDayPriceChange ?? 0) >= 0.04)
+        .sort((a, b) => Math.abs(b.oneDayPriceChange ?? 0) - Math.abs(a.oneDayPriceChange ?? 0))
+        .slice(0, limit);
+
+      const syntheticTweets = movingMarkets.map(market => ({
+        tweet: {
+          id: `synthetic-${market.id}`,
+          text: market.title,
+          author: 'synthetic one',
+          created_at: new Date().toISOString(),
+          metrics: { likes: 0, retweets: 0, replies: 0, quotes: 0 },
+          url: market.url,
+        },
+        matches: [],
+        sentiment: {
+          sentiment: (market.oneDayPriceChange ?? 0) > 0 ? 'bullish' : 'bearish',
+          confidence: Math.min(Math.abs(market.oneDayPriceChange ?? 0) * 4, 0.95),
+        },
+        category: market.category ?? 'finance',
+        urgency: Math.abs(market.oneDayPriceChange ?? 0) >= 0.10 ? 'high' : 'medium',
+        confidence: Math.min(0.5 + Math.abs(market.oneDayPriceChange ?? 0) * 2, 0.95),
+        analyzed_at: new Date().toISOString(),
+        collected_at: new Date().toISOString(),
+      }));
+
       const response: FeedResponse = {
         success: true,
         data: {
-          tweets: [],
-          count: 0,
+          tweets: syntheticTweets as any,
+          count: syntheticTweets.length,
           timestamp: new Date().toISOString(),
-          filters: {
-            limit,
-            category,
-            minUrgency,
-            since,
-          },
+          filters: { limit, category, minUrgency, since },
           metadata: {
             processing_time_ms: Date.now() - startTime,
             total_in_kv: 0,
@@ -148,8 +174,7 @@ export default async function handler(
         },
       };
 
-      // Cache for 30 seconds
-      res.setHeader('Cache-Control', 's-maxage=30, stale-while-revalidate');
+      res.setHeader('Cache-Control', 's-maxage=20, stale-while-revalidate');
       res.status(200).json(response);
       return;
     }
diff --git a/api/markets/arbitrage.ts b/api/markets/arbitrage.ts
index 26a2f2a..d387d66 100644
--- a/api/markets/arbitrage.ts
+++ b/api/markets/arbitrage.ts
@@ -87,6 +87,13 @@ export default async function handler(
       .filter(arb => !category || arb.polymarket.category === category || arb.kalshi.category === category)
       .slice(0, limitNum);
 
+    // add volume alias to market objects because bot uses volume instead of volume24h
+    const opportunitiesAlias = opportunities.map (arb => ({
+      ...arb,
+      polymarket: { ...arb.polymarket, volume: arb.polymarket.volume24h },
+      kalshi: { ...arb.kalshi,     volume: arb.kalshi.volume24h },
+    }));
+
     // Stage 0: Get freshness metadata
     const freshnessMetadata = getMarketMetadata();
 
@@ -94,7 +101,8 @@ export default async function handler(
     const response = {
       success: true,
       data: {
-        opportunities,
+        opportunities: opportunitiesAlias,
+        arbitrage_opportunities : opportunitiesAlias, //a key mismatch from bot
         count: opportunities.length,
         timestamp: new Date().toISOString(),
         filters: {
diff --git a/src/types/market.ts b/src/types/market.ts
index 93edfba..03b1a8c 100644
--- a/src/types/market.ts
+++ b/src/types/market.ts
@@ -13,6 +13,7 @@ export interface Market {
   noBid?: number;   // best executable NO bid when available
   noAsk?: number;   // best executable NO ask when available
   volume24h: number; // 24h trading volume in dollars
+  volume?: number; // alias for volume24h, added so bot can use
   url: string;
   category: string;
   lastUpdated: string; // ISO timestamp