diff --git a/package.json b/package.json
index b876898..7ae2e92 100644
--- a/package.json
+++ b/package.json
@@ -6,7 +6,8 @@
   "scripts": {
     "dev": "tsx watch src/index.ts",
     "build": "prisma generate && tsc",
-    "start": "prisma migrate deploy && node dist/index.js"
+    "start": "prisma migrate deploy && node dist/index.js",
+    "seed:demo": "tsx scripts/seed-demo.ts"
   },
   "dependencies": {
     "@fastify/cors": "^11.2.0",
diff --git a/scripts/seed-demo.ts b/scripts/seed-demo.ts
new file mode 100644
index 0000000..fc6a25d
--- /dev/null
+++ b/scripts/seed-demo.ts
@@ -0,0 +1,113 @@
+import { Prisma } from '@prisma/client'
+import { prisma } from '../src/db.js'
+
+const DEMO_TEAM_UUID = process.env.DEMO_TEAM_UUID ?? '11111111-1111-4111-8111-111111111111'
+
+const products = [
+  {
+    uuid: '55555555-1111-4111-8111-111111111111',
+    sku: 'DEMO-COPPER-CATHODE',
+    name: 'Copper cathode',
+    categoryName: 'Metals',
+    unit: 'ton',
+    description: 'Demo exchange product',
+  },
+  {
+    uuid: '55555555-1111-4111-8111-222222222222',
+    sku: 'DEMO-ALUMINUM-INGOT',
+    name: 'Aluminum ingot',
+    categoryName: 'Metals',
+    unit: 'ton',
+    description: 'Demo exchange product',
+  },
+  {
+    uuid: '55555555-1111-4111-8111-333333333333',
+    sku: 'DEMO-WHEAT',
+    name: 'Wheat',
+    categoryName: 'Agriculture',
+    unit: 'ton',
+    description: 'Demo exchange product',
+  },
+]
+
+const suppliers = [
+  {
+    uuid: '66666666-2222-4111-8111-111111111111',
+    teamUuid: DEMO_TEAM_UUID,
+    name: 'Demo Supplier Almaty',
+    description: 'Demo supplier tied to the seeded client team',
+    country: 'Kazakhstan',
+    countryCode: 'KZ',
+    isVerified: true,
+  },
+  {
+    uuid: '66666666-2222-4111-8111-222222222222',
+    teamUuid: null,
+    name: 'Demo Supplier Urumqi',
+    description: 'Demo supplier for catalog testing',
+    country: 'China',
+    countryCode: 'CN',
+    isVerified: true,
+  },
+  {
+    uuid: '66666666-2222-4111-8111-333333333333',
+    teamUuid: null,
+    name: 'Demo Supplier Moscow',
+    description: 'Demo supplier for catalog testing',
+    country: 'Russia',
+    countryCode: 'RU',
+    isVerified: true,
+  },
+]
+
+for (const product of products) {
+  await prisma.product.upsert({
+    where: { uuid: product.uuid },
+    create: { ...product, isActive: true },
+    update: { ...product, isActive: true },
+  })
+}
+
+for (const supplier of suppliers) {
+  await prisma.supplier.upsert({
+    where: { uuid: supplier.uuid },
+    create: { ...supplier, isActive: true },
+    update: { ...supplier, isActive: true },
+  })
+}
+
+for (let index = 0; index < 24; index += 1) {
+  const product = await prisma.product.findUniqueOrThrow({ where: { uuid: products[index % products.length].uuid } })
+  const supplier = await prisma.supplier.findUniqueOrThrow({ where: { uuid: suppliers[index % suppliers.length].uuid } })
+  const quoteUuid = `77777777-3333-4${String(index).padStart(3, '0')}-8${String(index).padStart(3, '0')}-777777${String(index).padStart(6, '0')}`
+
+  await prisma.quote.upsert({
+    where: { uuid: quoteUuid },
+    create: {
+      uuid: quoteUuid,
+      supplierId: supplier.id,
+      productId: product.id,
+      status: 'active',
+      quantity: new Prisma.Decimal(500 + index * 25),
+      unit: product.unit,
+      pricePerUnit: new Prisma.Decimal(900 + (index % 8) * 55),
+      currency: 'USD',
+      incotermsCode: index % 2 === 0 ? 'FOB' : 'DAP',
+      originPointUuid: `logistics-demo-hub-${(index % 4) + 1}`,
+      originName: supplier.name,
+      validUntil: new Date('2027-12-31'),
+      notes: 'Demo seed quote',
+    },
+    update: {
+      supplierId: supplier.id,
+      productId: product.id,
+      status: 'active',
+      unit: product.unit,
+      currency: 'USD',
+    },
+  })
+}
+
+console.log(`Seeded exchange demo data: products ${products.length}, suppliers ${suppliers.length}, quotes 24`)
+
+await prisma.$disconnect()