diff --git a/client/src/pages/MediaOutletAuction.tsx b/client/src/pages/MediaOutletAuction.tsx
index f1e0c72..f9249b4 100644
--- a/client/src/pages/MediaOutletAuction.tsx
+++ b/client/src/pages/MediaOutletAuction.tsx
@@ -32,10 +32,7 @@ export default function MediaOutletAuction() {
 
   const placeBidMutation = useMutation({
     mutationFn: async (bidData: { amount: number; qualityScore?: number }) => {
-      return apiRequest(`/api/media-outlets/${params?.slug}/auction/bids`, {
-        method: "POST",
-        body: JSON.stringify(bidData),
-      });
+      return apiRequest("POST", `/api/media-outlets/${params?.slug}/auction/bids`, bidData);
     },
     onSuccess: () => {
       toast({
@@ -75,7 +72,7 @@ export default function MediaOutletAuction() {
       return;
     }
 
-    if (auction && amount <= auction.currentBid) {
+    if (auction && auction.currentBid && amount <= parseFloat(auction.currentBid)) {
       toast({
         title: "입찰 금액 부족",
         description: `현재 최고 입찰가(${auction.currentBid}원)보다 높은 금액을 입력해주세요.`,
@@ -102,7 +99,7 @@ export default function MediaOutletAuction() {
     }).format(amount);
   };
 
-  const formatTimeRemaining = (endDate: string) => {
+  const formatTimeRemaining = (endDate: Date | string) => {
     const end = new Date(endDate);
     const now = new Date();
     const diff = end.getTime() - now.getTime();
@@ -264,7 +261,7 @@ export default function MediaOutletAuction() {
                     <span className="font-medium">현재 최고가</span>
                   </div>
                   <span className="text-2xl font-bold text-green-600">
-                    {formatCurrency(auction.currentBid)}
+                    {formatCurrency(parseFloat(auction.currentBid || "0"))}
                   </span>
                 </div>
 
@@ -278,14 +275,14 @@ export default function MediaOutletAuction() {
                   </span>
                 </div>
 
-                {auction.highestBidder && (
+                {auction.highestBidderId && (
                   <div className="flex items-center justify-between p-4 bg-muted rounded-lg">
                     <div className="flex items-center space-x-2">
                       <User className="h-4 w-4 text-blue-600" />
                       <span className="font-medium">최고 입찰자</span>
                     </div>
                     <span className="text-lg font-bold text-blue-600">
-                      {auction.highestBidder.slice(0, 3)}***
+                      {auction.highestBidderId.slice(0, 3)}***
                     </span>
                   </div>
                 )}
@@ -328,8 +325,8 @@ export default function MediaOutletAuction() {
                       type="number"
                       value={bidAmount}
                       onChange={(e) => setBidAmount(e.target.value)}
-                      placeholder={`${auction.currentBid + 1000} 이상`}
-                      min={auction.currentBid + 1}
+                      placeholder={`${parseFloat(auction.currentBid || "0") + 1000} 이상`}
+                      min={parseFloat(auction.currentBid || "0") + 1}
                       data-testid="input-bid-amount"
                     />
                   </div>
diff --git a/server/storage.ts b/server/storage.ts
index e0c4ecb..89d6445 100644
--- a/server/storage.ts
+++ b/server/storage.ts
@@ -53,6 +53,7 @@ export interface IStorage {
   // Auction operations
   getActiveAuctions(): Promise<Auction[]>;
   getAuctionById(id: string): Promise<Auction | undefined>;
+  getAuctionByMediaOutlet(mediaOutletId: string): Promise<Auction | undefined>;
   createAuction(auction: InsertAuction): Promise<Auction>;
   placeBid(bid: InsertBid): Promise<Bid>;
   
@@ -191,6 +192,13 @@ export class DatabaseStorage implements IStorage {
     return auction;
   }
 
+  async getAuctionByMediaOutlet(mediaOutletId: string): Promise<Auction | undefined> {
+    const [auction] = await db.select().from(auctions).where(
+      and(eq(auctions.mediaOutletId, mediaOutletId), eq(auctions.isActive, true))
+    );
+    return auction;
+  }
+
   async createAuction(auction: InsertAuction): Promise<Auction> {
     const [newAuction] = await db.insert(auctions).values(auction).returning();
     return newAuction;