diff --git a/frontend/src/hooks/usePortfolio.ts b/frontend/src/hooks/usePortfolio.ts
index 56dfa88..d845371 100644
--- a/frontend/src/hooks/usePortfolio.ts
+++ b/frontend/src/hooks/usePortfolio.ts
@@ -1,4 +1,5 @@
 import { useState, useEffect } from 'react'
+import { apiRequest, API_CONFIG } from '../config/api'
 
 interface PortfolioData {
     id: string
@@ -13,6 +14,11 @@ interface PortfolioData {
     lastRebalance: string
 }
 
+interface PortfolioResponse {
+    success?: boolean
+    portfolio: PortfolioData
+}
+
 export const usePortfolio = (portfolioId?: string) => {
     const [portfolio, setPortfolio] = useState<PortfolioData | null>(null)
     const [loading, setLoading] = useState(true)
@@ -24,10 +30,12 @@ export const usePortfolio = (portfolioId?: string) => {
         const fetchPortfolio = async () => {
             try {
                 setLoading(true)
-                const response = await fetch(`/api/portfolio/${portfolioId}`)
-                if (!response.ok) throw new Error('Failed to fetch portfolio')
-
-                const data = await response.json()
+                const data = await apiRequest<PortfolioResponse>(
+                    `${API_CONFIG.BASE_URL}${API_CONFIG.ENDPOINTS.PORTFOLIO_DETAIL(portfolioId)}`
+                )
+                if (!data?.portfolio) {
+                    throw new Error('Failed to fetch portfolio')
+                }
                 setPortfolio(data.portfolio)
                 setError(null)
             } catch (err) {
@@ -48,19 +56,27 @@ export const usePortfolio = (portfolioId?: string) => {
         if (!portfolioId) return
 
         try {
-            const response = await fetch(`/api/portfolio/${portfolioId}/rebalance`, {
-                method: 'POST'
-            })
-            if (!response.ok) throw new Error('Rebalance failed')
+            await apiRequest(
+                `${API_CONFIG.BASE_URL}${API_CONFIG.ENDPOINTS.PORTFOLIO_REBALANCE(portfolioId)}`,
+                {
+                    method: 'POST',
+                    body: JSON.stringify({}),
+                }
+            )
 
             // Refresh portfolio data
-            const portfolioResponse = await fetch(`/api/portfolio/${portfolioId}`)
-            const data = await portfolioResponse.json()
+            const data = await apiRequest<PortfolioResponse>(
+                `${API_CONFIG.BASE_URL}${API_CONFIG.ENDPOINTS.PORTFOLIO_DETAIL(portfolioId)}`
+            )
+            if (!data?.portfolio) {
+                throw new Error('Failed to fetch portfolio')
+            }
             setPortfolio(data.portfolio)
+            setError(null)
         } catch (err) {
             setError(err instanceof Error ? err.message : 'Rebalance failed')
         }
     }
 
     return { portfolio, loading, error, executeRebalance }
-}
\ No newline at end of file
+}