diff --git a/core/src/main/kotlin/dev/usbharu/multim/api/AccountApi.kt b/core/src/main/kotlin/dev/usbharu/multim/api/AccountApi.kt
index e6cc5ad..86c983d 100644
--- a/core/src/main/kotlin/dev/usbharu/multim/api/AccountApi.kt
+++ b/core/src/main/kotlin/dev/usbharu/multim/api/AccountApi.kt
@@ -1,6 +1,8 @@
 package dev.usbharu.multim.api
 
+import com.github.michaelbull.result.Err
 import com.github.michaelbull.result.Result
+import dev.usbharu.multim.error.ErrorType
 import dev.usbharu.multim.error.MultiMError
 import dev.usbharu.multim.model.*
 
@@ -22,3 +24,51 @@ interface AccountApi {
     suspend fun requestAccept(account: Account): Result<Unit,MultiMError>
     suspend fun requestReject(account: Account): Result<Unit,MultiMError>
 }
+
+object NotImplAccountApi : AccountApi {
+    override suspend fun userTimeline(
+        account: Account,
+        since: StatusId?,
+        until: StatusId?
+    ): Result<List<Status>, MultiMError> {
+        return Err(MultiMError("userTimeline not implements", null, ErrorType.NOT_IMPL))
+    }
+
+    override suspend fun follow(account: Account): Result<Unit, MultiMError> {
+        return Err(MultiMError("follow not implements", null, ErrorType.NOT_IMPL))
+    }
+
+    override suspend fun unfollow(account: Account): Result<Unit, MultiMError> {
+        return Err(MultiMError("unfollow not implements",null,ErrorType.NOT_IMPL))
+    }
+
+    override suspend fun profile(account: Account): Result<Profile, MultiMError> {
+        return Err(MultiMError("profile not implements",null,ErrorType.NOT_IMPL))
+    }
+
+    override suspend fun statuses(
+        account: Account,
+        includeRepost: Boolean
+    ): Result<List<Status>, MultiMError> {
+        return Err(MultiMError("statuses not implements",null,ErrorType.NOT_IMPL))
+    }
+
+    override suspend fun relationships(
+        myself: Account,
+        other: Account
+    ): Result<Relation, MultiMError> {
+        return Err(MultiMError("relationships not implements",null,ErrorType.NOT_IMPL))
+    }
+
+    override suspend fun requestCancel(account: Account): Result<Unit, MultiMError> {
+        return Err(MultiMError("requestCancel not implements",null,ErrorType.NOT_IMPL))
+    }
+
+    override suspend fun requestAccept(account: Account): Result<Unit, MultiMError> {
+        return Err(MultiMError("requestAccept not implements",null,ErrorType.NOT_IMPL))
+    }
+
+    override suspend fun requestReject(account: Account): Result<Unit, MultiMError> {
+        return Err(MultiMError("requestReject not implements",null,ErrorType.NOT_IMPL))
+    }
+}
diff --git a/core/src/main/kotlin/dev/usbharu/multim/api/EmojiApi.kt b/core/src/main/kotlin/dev/usbharu/multim/api/EmojiApi.kt
index 748839e..d1a0a6a 100644
--- a/core/src/main/kotlin/dev/usbharu/multim/api/EmojiApi.kt
+++ b/core/src/main/kotlin/dev/usbharu/multim/api/EmojiApi.kt
@@ -1,5 +1,8 @@
 package dev.usbharu.multim.api
 
+import com.github.michaelbull.result.Err
+import dev.usbharu.multim.error.ErrorType
+import dev.usbharu.multim.error.MultiMError
 import dev.usbharu.multim.error.MultiMResult
 import dev.usbharu.multim.model.Emoji
 
@@ -8,3 +11,13 @@ interface EmojiApi {
 
     suspend fun findByName(name:String):MultiMResult<List<Emoji>>
 }
+
+object NotImplEmojiApi : EmojiApi {
+    override suspend fun get(name: String): MultiMResult<Emoji> {
+        return Err(MultiMError("emoji get not implements",null, ErrorType.NOT_IMPL))
+    }
+
+    override suspend fun findByName(name: String): MultiMResult<List<Emoji>> {
+        return Err(MultiMError("emoji findByName not implements",null,ErrorType.NOT_IMPL))
+    }
+}
diff --git a/core/src/main/kotlin/dev/usbharu/multim/api/StatusApi.kt b/core/src/main/kotlin/dev/usbharu/multim/api/StatusApi.kt
index 3323964..564026b 100644
--- a/core/src/main/kotlin/dev/usbharu/multim/api/StatusApi.kt
+++ b/core/src/main/kotlin/dev/usbharu/multim/api/StatusApi.kt
@@ -1,6 +1,8 @@
 package dev.usbharu.multim.api
 
+import com.github.michaelbull.result.Err
 import com.github.michaelbull.result.Result
+import dev.usbharu.multim.error.ErrorType
 import dev.usbharu.multim.error.MultiMError
 import dev.usbharu.multim.model.*
 
@@ -28,3 +30,61 @@ interface StatusApi {
     suspend fun removeFromBookmarks(id: StatusId): Result<Unit,MultiMError>
     suspend fun getPreviousAndNext(id: StatusId): Result<PreviousAndNextPosts,MultiMError>
 }
+
+
+object NotImplStatusApi : StatusApi {
+    override suspend fun post(status: StatusForPost): Result<Status, MultiMError> {
+        return Err(MultiMError("post not implements",null, ErrorType.NOT_IMPL))
+    }
+
+    override suspend fun delete(id: StatusId): Result<Unit, MultiMError> {
+        return Err(MultiMError("delete not implements",null,ErrorType.NOT_IMPL))
+    }
+
+    override suspend fun findById(id: StatusId): Result<Status, MultiMError> {
+        return Err(MultiMError("findById not implements",null,ErrorType.NOT_IMPL))
+    }
+
+    override suspend fun addReaction(id: StatusId, reaction: Reaction): Result<Unit, MultiMError> {
+        return Err(MultiMError("addReaction not implements",null,ErrorType.NOT_IMPL))
+    }
+
+    override suspend fun removeReaction(
+        id: StatusId,
+        reaction: Reaction?
+    ): Result<Unit, MultiMError> {
+        return Err(MultiMError("removeReaction not implements",null,ErrorType.NOT_IMPL))
+    }
+
+    override suspend fun reactions(id: StatusId): Result<Map<Reaction, Int>, MultiMError> {
+        return Err(MultiMError("reactions not implements",null,ErrorType.NOT_IMPL))
+    }
+
+    override suspend fun replies(id: StatusId): Result<List<Status>, MultiMError> {
+        return Err(MultiMError("replies not implements",null,ErrorType.NOT_IMPL))
+    }
+
+    override suspend fun repost(id: StatusId): Result<Status, MultiMError> {
+        return Err(MultiMError("repost not implements",null,ErrorType.NOT_IMPL))
+    }
+
+    override suspend fun unRepost(id: StatusId): Result<Unit, MultiMError> {
+        return Err(MultiMError("unRepost not implements",null,ErrorType.NOT_IMPL))
+    }
+
+    override suspend fun replyTo(id: StatusId, status: StatusForPost): Result<Status, MultiMError> {
+        return Err(MultiMError("replyTo not implements",null,ErrorType.NOT_IMPL))
+    }
+
+    override suspend fun addToBookmarks(id: StatusId): Result<Unit, MultiMError> {
+        return Err(MultiMError("addToBookmarks not implements",null,ErrorType.NOT_IMPL))
+    }
+
+    override suspend fun removeFromBookmarks(id: StatusId): Result<Unit, MultiMError> {
+        return Err(MultiMError("removeFromBookmarks not implements",null,ErrorType.NOT_IMPL))
+    }
+
+    override suspend fun getPreviousAndNext(id: StatusId): Result<PreviousAndNextPosts, MultiMError> {
+        return Err(MultiMError("getPreviousAndNext not implements",null,ErrorType.NOT_IMPL))
+    }
+}
diff --git a/core/src/main/kotlin/dev/usbharu/multim/api/TimelineApi.kt b/core/src/main/kotlin/dev/usbharu/multim/api/TimelineApi.kt
index a2902a5..19d0a73 100644
--- a/core/src/main/kotlin/dev/usbharu/multim/api/TimelineApi.kt
+++ b/core/src/main/kotlin/dev/usbharu/multim/api/TimelineApi.kt
@@ -1,6 +1,8 @@
 package dev.usbharu.multim.api
 
+import com.github.michaelbull.result.Err
 import com.github.michaelbull.result.Result
+import dev.usbharu.multim.error.ErrorType
 import dev.usbharu.multim.error.MultiMError
 import dev.usbharu.multim.model.Status
 import dev.usbharu.multim.model.Timeline
@@ -24,3 +26,24 @@ interface TimelineApi {
 
 
 }
+
+object NotImplTimelineApi : TimelineApi {
+    override suspend fun availableTimelines(): Result<List<Timeline>, MultiMError> {
+        return Err(MultiMError("availableTimelines not implements",null, ErrorType.NOT_IMPL))
+    }
+
+    override suspend fun listen(
+        timeline: Timeline,
+        callback: (List<Status>) -> Unit
+    ): Result<Unit, MultiMError> {
+        return Err(MultiMError("timeline listen not implements",null,ErrorType.NOT_IMPL))
+    }
+
+    override suspend fun connect(timeline: Timeline): Result<Unit, MultiMError> {
+        return Err(MultiMError("timeline connect not implements",null,ErrorType.NOT_IMPL))
+    }
+
+    override suspend fun disconnect(timeline: Timeline, force: Boolean): Result<Unit, MultiMError> {
+        return Err(MultiMError("timeline disconnect not implements",null,ErrorType.NOT_IMPL))
+    }
+}