diff --git a/handlers/new-product-api/src/main/scala/com/gu/newproduct/api/productcatalog/Catalog.scala b/handlers/new-product-api/src/main/scala/com/gu/newproduct/api/productcatalog/Catalog.scala
new file mode 100644
index 0000000000..4ab79916ca
--- /dev/null
+++ b/handlers/new-product-api/src/main/scala/com/gu/newproduct/api/productcatalog/Catalog.scala
@@ -0,0 +1,56 @@
+package com.gu.newproduct.api.productcatalog
+
+import play.api.libs.json.{JsString, Json, Writes}
+
+sealed trait DayOfWeek
+
+case object Monday extends DayOfWeek
+
+case object Tuesday extends DayOfWeek
+
+case object Wednesday extends DayOfWeek
+
+case object Thursday extends DayOfWeek
+
+case object Friday extends DayOfWeek
+
+case object Saturday extends DayOfWeek
+
+case object Sunday extends DayOfWeek
+
+case class ProductInfo(
+  id: String,
+  label: String,
+  startDateRules: Option[StartDateRules] = None
+)
+
+case class StartDateRules(
+  daysOfWeek: Option[List[DayOfWeek]] = None,
+  cutOffDayInclusive: Option[DayOfWeek] = None,
+  minDaysAfterCutOff: Option[Int] = None,
+  windowSizeDays: Option[Int] = None,
+)
+
+
+case class Group(label: String, products: List[ProductInfo])
+
+case class Catalog(groups: List[Group])
+
+object DayOfWeek {
+  implicit val writes: Writes[DayOfWeek] = { (day: DayOfWeek) => JsString(day.toString) }
+}
+
+object StartDateRules{
+  implicit val writes = Json.writes[StartDateRules]
+}
+object ProductInfo {
+  implicit val writes = Json.writes[ProductInfo]
+}
+
+object Group {
+  implicit val writes = Json.writes[Group]
+}
+
+object Catalog {
+  implicit val writes = Json.writes[Catalog]
+}
diff --git a/handlers/new-product-api/src/main/scala/com/gu/newproduct/api/productcatalog/Handler.scala b/handlers/new-product-api/src/main/scala/com/gu/newproduct/api/productcatalog/Handler.scala
index 15e30fe1f3..834360f402 100644
--- a/handlers/new-product-api/src/main/scala/com/gu/newproduct/api/productcatalog/Handler.scala
+++ b/handlers/new-product-api/src/main/scala/com/gu/newproduct/api/productcatalog/Handler.scala
@@ -15,11 +15,46 @@ object Handler extends Logging {
     ApiGatewayHandler(LambdaIO(inputStream, outputStream, context)) {
       ContinueProcessing(
         Operation.noHealthcheck {
-          Req: ApiGatewayRequest => ApiGatewayResponse.successfulExecution
+          Req: ApiGatewayRequest => ApiGatewayResponse(body = catalog, statusCode = "200")
         }
       )
     }
-}
 
+  val catalog = {
+    val voucherEverydayRules = StartDateRules(
+      cutOffDayInclusive = Some(Tuesday),
+      daysOfWeek = Some(List(Monday)),
+      minDaysAfterCutOff = Some(20),
+      windowSizeDays = Some(28)
+    )
+
+    val voucherEveryday = ProductInfo(
+      id = "voucher_everyday",
+      label = "Every day",
+      startDateRules = Some(voucherEverydayRules)
+    )
+
+    val weekendsRule = voucherEverydayRules.copy(
+      daysOfWeek = Some(List(Saturday, Sunday))
+    )
+    val voucherWeekend = ProductInfo(
+      id = "voucher_weekend",
+      label = "Weekend",
+      startDateRules = Some(weekendsRule)
+    )
 
+    val contributionRules = StartDateRules(
+      windowSizeDays = Some(1)
+    )
+
+    val monthlyContribution = ProductInfo(
+      id = "monthly_contribution",
+      label = "Monthly",
+      startDateRules = Some(contributionRules)
+    )
+    val voucherGroup = Group("Voucher", List(voucherWeekend, voucherEveryday))
+    val contributionGroup = Group("Contribution", List(monthlyContribution))
+    Catalog(List(voucherGroup, contributionGroup))
+  }
+}
 
diff --git a/handlers/new-product-api/src/test/scala/com/gu/newproduct/api/productcatalog/CatalogTest.scala b/handlers/new-product-api/src/test/scala/com/gu/newproduct/api/productcatalog/CatalogTest.scala
new file mode 100644
index 0000000000..719dcf4a89
--- /dev/null
+++ b/handlers/new-product-api/src/test/scala/com/gu/newproduct/api/productcatalog/CatalogTest.scala
@@ -0,0 +1,77 @@
+package com.gu.newproduct.api.productcatalog
+
+import org.scalatest.{FlatSpec, Matchers}
+import play.api.libs.json.Json
+
+class CatalogTest extends FlatSpec with Matchers {
+  it should "serialise catalog" in {
+
+    val everyDayRules = StartDateRules(
+      cutOffDayInclusive = Some(Tuesday),
+      daysOfWeek = Some(List(Monday)),
+      minDaysAfterCutOff = Some(20),
+      windowSizeDays = Some(28)
+    )
+
+    val voucherEveryday = ProductInfo(
+      id = "voucher_everyday",
+      label = "Every day",
+      startDateRules = Some(everyDayRules)
+    )
+
+    val weekendsRule = everyDayRules.copy(
+      daysOfWeek = Some(List(Saturday, Sunday))
+    )
+    val voucherWeekend = ProductInfo(
+      id = "voucher_weekend",
+      label = "Weekend",
+      startDateRules = Some(weekendsRule)
+    )
+
+    val monthlyContribution = ProductInfo(
+      id = "monthly_contribution",
+      label = "Monthly"
+    )
+
+    val voucherGroup = Group("Voucher", List(voucherWeekend, voucherEveryday))
+    val contributionGroup = Group("Contribution", List(monthlyContribution))
+    val catalog = Catalog(List(voucherGroup, contributionGroup))
+    val expected =
+      """
+        |{
+        |"groups": [{
+        |    "label": "Voucher",
+        |    "products": [{
+        |            "id": "voucher_weekend",
+        |            "label": "Weekend",
+        |            "startDateRules" : {
+        |            "cutOffDayInclusive": "Tuesday",
+        |            "minDaysAfterCutOff" : 20,
+        |            "windowSizeDays" : 28,
+        |            "daysOfWeek": ["Saturday", "Sunday"]
+        |            }
+        |        },
+        |        {
+        |            "id": "voucher_everyday",
+        |            "label": "Every day",
+        |             "startDateRules" : {
+        |            "cutOffDayInclusive": "Tuesday",
+        |            "minDaysAfterCutOff" : 20,
+        |            "windowSizeDays" : 28,
+        |            "daysOfWeek": ["Monday"]
+        |            }
+        |        }
+        |    ]
+        |}, {
+        |    "label": "Contribution",
+        |    "products": [{
+        |        "id": "monthly_contribution",
+        |        "label": "Monthly"
+        |    }]
+        |}]
+        |}
+      """.stripMargin
+    Json.toJson(catalog) shouldBe Json.parse(expected)
+
+  }
+}