diff --git a/src/app/api/sync/history/route.ts b/src/app/api/sync/history/route.ts
index 7e6a78c..b1d5530 100644
--- a/src/app/api/sync/history/route.ts
+++ b/src/app/api/sync/history/route.ts
@@ -2,7 +2,9 @@ import { NextResponse } from 'next/server'
 import { prisma } from '@/lib/prisma'
 import type { SyncHistoryEntry, SyncLogEntry } from '@/types/sync'
 
-export async function GET() {
+import { NextRequest } from 'next/server'
+
+export async function GET(_req: NextRequest) {
   try {
     const runs = await prisma.syncRun.findMany({
       orderBy: { createdAt: 'desc' },
diff --git a/src/app/api/sync/preview/route.ts b/src/app/api/sync/preview/route.ts
index c325ade..55e4318 100644
--- a/src/app/api/sync/preview/route.ts
+++ b/src/app/api/sync/preview/route.ts
@@ -3,7 +3,9 @@ import { readSheetProducts } from '@/lib/googleSheets'
 import { fetchAllShopifyProducts } from '@/lib/shopifySync'
 import { computeDiff } from '@/lib/syncDiff'
 
-export async function GET() {
+import { NextRequest } from 'next/server'
+
+export async function GET(_req: NextRequest) {
   try {
     const [sheetProducts, shopifyProducts] = await Promise.all([
       readSheetProducts(),
diff --git a/src/lib/googleSheets.ts b/src/lib/googleSheets.ts
index b958a56..735723a 100644
--- a/src/lib/googleSheets.ts
+++ b/src/lib/googleSheets.ts
@@ -37,33 +37,28 @@ export function parseSheetRows(rows: string[][]): SyncProduct[] {
 }
 
 /**
- * Lit tous les produits depuis Google Sheets via l'API v4.
- * Utilise un service account (GOOGLE_SERVICE_ACCOUNT_EMAIL + GOOGLE_PRIVATE_KEY).
+ * Lit tous les produits depuis Google Sheets via l'API v4 (API Key publique).
+ * Le fichier Sheets doit être partagé en lecture ("Toute personne avec le lien").
  */
 export async function readSheetProducts(): Promise<SyncProduct[]> {
-  const email = process.env.GOOGLE_SERVICE_ACCOUNT_EMAIL
-  const key = process.env.GOOGLE_PRIVATE_KEY?.replace(/\\n/g, '\n')
+  const apiKey = process.env.GOOGLE_API_KEY
   const sheetId = process.env.GOOGLE_SHEETS_ID
   const sheetName = process.env.GOOGLE_SHEETS_TAB ?? 'Produits'
 
-  if (!email || !key || !sheetId) {
-    throw new Error('Variables GOOGLE_SERVICE_ACCOUNT_EMAIL, GOOGLE_PRIVATE_KEY et GOOGLE_SHEETS_ID requises')
+  if (!apiKey || !sheetId) {
+    throw new Error('Variables GOOGLE_API_KEY et GOOGLE_SHEETS_ID requises')
   }
 
-  const { google } = await import('googleapis')
+  const range = encodeURIComponent(`${sheetName}!A2:F`)
+  const url = `https://sheets.googleapis.com/v4/spreadsheets/${sheetId}/values/${range}?key=${apiKey}`
 
-  const auth = new google.auth.GoogleAuth({
-    credentials: { client_email: email, private_key: key },
-    scopes: ['https://www.googleapis.com/auth/spreadsheets.readonly'],
-  })
+  const res = await fetch(url)
+  if (!res.ok) {
+    const err = await res.text()
+    throw new Error(`Google Sheets API error: ${res.status} — ${err}`)
+  }
 
-  const sheets = google.sheets({ version: API_VERSION, auth })
-
-  const response = await sheets.spreadsheets.values.get({
-    spreadsheetId: sheetId,
-    range: `${sheetName}!A2:F`,  // A2 = skip header row
-  })
-
-  const rows = (response.data.values ?? []) as string[][]
+  const data = await res.json()
+  const rows = (data.values ?? []) as string[][]
   return parseSheetRows(rows)
 }