diff --git a/SodaLive/Sources/V2/Gift/Models/GiftModels.swift b/SodaLive/Sources/V2/Gift/Models/GiftModels.swift
new file mode 100644
index 00000000..dd40c0a4
--- /dev/null
+++ b/SodaLive/Sources/V2/Gift/Models/GiftModels.swift
@@ -0,0 +1,135 @@
+import Foundation
+
+struct GiftFormOptionsResponse: Decodable {
+    let sizes: [GiftSizeOptionResponse]
+    let categories: [GiftCategoryOptionResponse]
+}
+
+struct GiftSizeOptionResponse: Decodable {
+    let sizeCode: String
+    let name: String
+    let basePriceCan: Int
+    let salePriceCan: Int
+}
+
+struct GiftCategoryOptionResponse: Decodable {
+    let categoryId: Int
+    let name: String
+    let requiresDamageWaiver: Bool
+}
+
+struct CreateGiftRequest: Encodable {
+    let recipientMemberId: Int
+    let senderName: String
+    let senderPhoneNumber: String
+    let senderZipCode: String
+    let senderAddress: String
+    let senderAddressDetail: String
+    let sizeCode: String
+    let categoryId: Int
+    let senderTermsAgreed: Bool
+    let senderPrivacyAgreed: Bool
+    let damageWaiverAgreed: Bool
+}
+
+struct CreateGiftResponse: Decodable {
+    let applicationNo: String
+    let status: String
+    let statusName: String
+    let priceCan: Int
+    let trackingDeadlineAt: String
+}
+
+struct GiftListResponse: Decodable {
+    let totalCount: Int
+    let items: [GiftListItemResponse]
+    let page: Int
+    let size: Int
+    let hasNext: Bool
+}
+
+struct GiftListItemResponse: Decodable {
+    let applicationNo: String
+    let direction: String
+    let status: String
+    let statusName: String
+    let priceCan: Int
+    let categoryName: String
+    let sizeName: String
+    let counterpartMemberId: Int
+    let counterpartNickname: String
+    let counterpartProfileImageUrl: String?
+    let createdAt: String
+}
+
+struct GiftDetailResponse: Decodable {
+    let applicationNo: String
+    let direction: String
+    let status: String
+    let statusName: String
+    let giftInfo: GiftInfoResponse
+    let senderInfo: GiftSenderInfoResponse?
+    let recipientAddress: GiftRecipientAddressResponse?
+    let mailbox: GiftMailboxResponse?
+    let trackingRequired: Bool
+    let recipientAddressRequired: Bool
+    let recipientAddressDeadlineAt: String?
+    let delivery: GiftDeliveryResponse
+    let statusTimeline: [GiftStatusTimelineResponse]
+}
+
+struct GiftInfoResponse: Decodable {
+    let recipientCreatorNickname: String?
+    let senderNickname: String?
+    let sizeName: String
+    let categoryName: String
+    let applicationNo: String?
+    let paidCan: Int?
+    let tracking: String?
+    let shippingRequestedAt: String?
+}
+
+struct GiftSenderInfoResponse: Decodable {
+    let name: String
+    let phoneNumber: String
+    let address: String
+}
+
+struct GiftRecipientAddressResponse: Decodable {
+    let name: String
+    let phoneNumber: String
+    let address: String
+}
+
+struct GiftMailboxResponse: Decodable {
+    let name: String
+    let address: String
+    let phoneNumber: String
+}
+
+struct GiftDeliveryResponse: Decodable {
+    let canceledAt: String?
+    let undeliverableAt: String?
+    let undeliverableReason: String?
+}
+
+struct GiftStatusTimelineResponse: Decodable {
+    let status: String
+    let statusName: String
+    let occurredAt: String?
+}
+
+struct RegisterGiftTrackingRequest: Encodable {
+    let courierCompanyName: String
+    let trackingNumber: String
+}
+
+struct SubmitGiftRecipientAddressRequest: Encodable {
+    let recipientName: String
+    let recipientPhoneNumber: String
+    let recipientZipCode: String
+    let recipientAddress: String
+    let recipientAddressDetail: String
+    let recipientTermsAgreed: Bool
+    let recipientPrivacyAgreed: Bool
+}
diff --git a/work/tests/GiftDecodingContractCheck.swift b/work/tests/GiftDecodingContractCheck.swift
new file mode 100644
index 00000000..93ab088e
--- /dev/null
+++ b/work/tests/GiftDecodingContractCheck.swift
@@ -0,0 +1,62 @@
+import Foundation
+
+@main
+enum GiftDecodingContractCheck {
+    static var assertions = 0
+
+    static func check(_ condition: Bool, _ message: String) {
+        guard condition else { print("FAIL: \(message)"); exit(1) }
+        assertions += 1
+    }
+
+    static func decode<T: Decodable>(_ type: T.Type, _ json: String) throws -> T {
+        try JSONDecoder().decode(type, from: Data(json.utf8))
+    }
+
+    static func main() {
+        let form = #"{"success":true,"message":"Options loaded","data":{"sizes":[{"sizeCode":"S","name":"Small","basePriceCan":100,"salePriceCan":80}],"categories":[{"categoryId":7,"name":"Flowers","requiresDamageWaiver":true}]}}"#
+        let create = #"{"success":true,"message":"Gift created","data":{"applicationNo":"G-1001","status":"CREATED","statusName":"Created","priceCan":80,"trackingDeadlineAt":"2026-10-10T12:00:00Z"}}"#
+        let list = #"{"success":true,"message":"Gifts loaded","data":{"totalCount":1,"items":[{"applicationNo":"G-1001","direction":"SENT","status":"CREATED","statusName":"Created","priceCan":80,"categoryName":"Flowers","sizeName":"Small","counterpartMemberId":42,"counterpartNickname":"Mina","counterpartProfileImageUrl":null,"createdAt":"2026-10-07T12:00:00Z"}],"page":1,"size":20,"hasNext":false}}"#
+        let detail = #"{"success":true,"message":"Gift detail loaded","data":{"applicationNo":"G-1001","direction":"SENT","status":"CREATED","statusName":"Created","giftInfo":{"recipientCreatorNickname":"Mina","senderNickname":"Jae","sizeName":"Small","categoryName":"Flowers","applicationNo":null,"paidCan":80,"tracking":"123456","shippingRequestedAt":null},"senderInfo":{"name":"Jae","phoneNumber":"010-1234-5678","address":"Seoul"},"recipientAddress":null,"mailbox":{"name":"Mina","address":"Busan","phoneNumber":"010-9876-5432"},"trackingRequired":true,"recipientAddressRequired":false,"recipientAddressDeadlineAt":null,"delivery":{"canceledAt":null,"undeliverableAt":null,"undeliverableReason":null},"statusTimeline":[{"status":"CREATED","statusName":"Created","occurredAt":"2026-10-07T12:00:00Z"}]}}"#
+
+        let options = try! decode(ApiResponse<GiftFormOptionsResponse>.self, form)
+        check(options.success, "form success")
+        check(options.data?.sizes.first?.sizeCode == "S" && options.data?.sizes.first?.name == "Small", "size fields")
+        check(options.data?.categories.first?.categoryId == 7 && options.data?.categories.first?.name == "Flowers", "category fields")
+        check(options.data?.categories.first?.requiresDamageWaiver == true, "waiver")
+
+        let created = try! decode(ApiResponse<CreateGiftResponse>.self, create)
+        check(created.data?.applicationNo == "G-1001" && created.data?.statusName == "Created", "create fields")
+        check(created.data?.priceCan == 80 && created.data?.trackingDeadlineAt == "2026-10-10T12:00:00Z", "create values")
+
+        let gifts = try! decode(ApiResponse<GiftListResponse>.self, list)
+        check(gifts.data?.totalCount == 1 && gifts.data?.page == 1 && gifts.data?.size == 20 && gifts.data?.hasNext == false, "list paging")
+        check(gifts.data?.items.first?.categoryName == "Flowers" && gifts.data?.items.first?.counterpartNickname == "Mina", "list values")
+        check(gifts.data?.items.first?.counterpartProfileImageUrl == nil, "list nullable profile image")
+
+        let gift = try! decode(ApiResponse<GiftDetailResponse>.self, detail).data!
+        check(gift.applicationNo == "G-1001" && gift.giftInfo.categoryName == "Flowers", "detail values")
+        check(gift.applicationNo == "G-1001" && gift.giftInfo.applicationNo == nil, "detail application numbers")
+        check(gift.senderInfo?.name == "Jae" && gift.mailbox?.name == "Mina", "detail nested values")
+        check(gift.recipientAddress == nil && gift.recipientAddressDeadlineAt == nil && gift.giftInfo.shippingRequestedAt == nil, "detail nullable values")
+        check(gift.statusTimeline.first?.statusName == "Created", "timeline status name")
+
+        for json in [
+            #"{"success":true,"message":"Gift canceled","data":{"applicationNo":"G-1001","status":"CANCELED","statusName":"Canceled","priceCan":80,"canceledAt":"2026-10-07T13:00:00Z"}}"#,
+            #"{"success":true,"message":"Tracking registered","data":{"applicationNo":"G-1001","status":"TRACKING_REGISTERED","statusName":"Tracking registered","courierCompanyName":"Fast Express","trackingNumber":"123456","trackingRegisteredAt":"2026-10-07T13:00:00Z","recipientAddressDeadlineAt":"2026-10-10T12:00:00Z"}}"#,
+            #"{"success":true,"message":"Recipient address registered","data":{"applicationNo":"G-1001","status":"ADDRESS_REGISTERED","statusName":"Address registered","recipientAddressRegisteredAt":"2026-10-07T14:00:00Z"}}"#
+        ] {
+            check(try! decode(ApiResponseWithoutData.self, json).success, "mutation success envelope")
+        }
+        check(try! decode(ApiResponseWithoutData.self, #"{"success":true}"#).success, "envelope without data")
+        check(!(try! decode(ApiResponseWithoutData.self, #"{"success":false,"data":{"applicationNo":"G-1001"}}"#).success), "false success")
+
+        let size = try! decode(GiftSizeOptionResponse.self, #"{"sizeCode":"S","name":"Small","basePriceCan":100,"salePriceCan":80}"#)
+        check(size.name == "Small", "direct size.name")
+        let category = try! decode(GiftCategoryOptionResponse.self, #"{"categoryId":7,"name":"Flowers","requiresDamageWaiver":true}"#)
+        check(category.name == "Flowers", "direct category.name")
+        let timeline = try! decode(GiftStatusTimelineResponse.self, #"{"status":"CREATED","statusName":"Created","occurredAt":"2026-10-07T12:00:00Z"}"#)
+        check(timeline.statusName == "Created", "direct timeline.statusName")
+        print("PASS: \(assertions) assertions")
+    }
+}
diff --git a/work/tests/check-gift-decoding-contract.sh b/work/tests/check-gift-decoding-contract.sh
new file mode 100755
index 00000000..6ce389cc
--- /dev/null
+++ b/work/tests/check-gift-decoding-contract.sh
@@ -0,0 +1,15 @@
+#!/bin/sh
+set -eu
+
+root=$(CDPATH= cd -- "$(dirname -- "$0")/../.." && pwd)
+tmp=$(mktemp -d)
+trap 'rm -rf "$tmp"' EXIT
+
+swiftc \
+  "$root/SodaLive/Sources/Common/ApiResponse.swift" \
+  "$root/SodaLive/Sources/Common/ApiResponseWithoutData.swift" \
+  "$root/SodaLive/Sources/V2/Gift/Models/GiftModels.swift" \
+  "$root/work/tests/GiftDecodingContractCheck.swift" \
+  -o "$tmp/gift-decoding-contract-check"
+
+"$tmp/gift-decoding-contract-check"