diff --git a/CHANGELOG b/CHANGELOG
index 58d0d932f2..39438fbf05 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -42,3 +42,12 @@
 * Add extension `String#toMarkdown`
 * Fix of inserting of text when create Markdown-adapted text from text and text entities
 * Fix default realisation of MessageEntity#asMarkdownSource
+
+### 0.9.0
+
+* Old extension `OkHttpClient.Builder#useWith` now deprecated and must be replaced by the same in
+`com.github.insanusmokrassar.TelegramBotAPI.bot.Ktor` package
+* Replace `ProxySettings` data class in `settings` package, deprecate old link
+* `BaseRequestsExecutor` now have no it's own scope
+* Add `RequestLimiter` and base realisations
+* Now `KtorRequestsExecutor` can receive as one of parameters `RequestLimiter` (by default - `EmptyLimiter`)
diff --git a/build.gradle b/build.gradle
index 679e579617..4b60baaa21 100644
--- a/build.gradle
+++ b/build.gradle
@@ -1,4 +1,4 @@
-project.version = "0.8.5"
+project.version = "0.9.0"
 project.group = "com.github.insanusmokrassar"
 
 buildscript {
diff --git a/gradle.properties b/gradle.properties
index dc6da056e3..209f0390f7 100644
--- a/gradle.properties
+++ b/gradle.properties
@@ -3,6 +3,6 @@ kotlin_version=1.3.11
 kotlin_coroutines_version=1.1.0
 kotlin_serialisation_runtime_version=0.9.1
 joda_time_version=2.10.1
-ktor_version=1.0.1
+ktor_version=1.1.1
 
 gradle_bintray_plugin_version=1.8.4
diff --git a/src/main/kotlin/com/github/insanusmokrassar/TelegramBotAPI/bot/BaseRequestsExecutor.kt b/src/main/kotlin/com/github/insanusmokrassar/TelegramBotAPI/bot/BaseRequestsExecutor.kt
new file mode 100644
index 0000000000..abaf662aa4
--- /dev/null
+++ b/src/main/kotlin/com/github/insanusmokrassar/TelegramBotAPI/bot/BaseRequestsExecutor.kt
@@ -0,0 +1,8 @@
+package com.github.insanusmokrassar.TelegramBotAPI.bot
+
+abstract class BaseRequestsExecutor(
+    token: String,
+    hostUrl: String = "https://api.telegram.org"
+) : RequestsExecutor {
+    protected val baseUrl: String = "$hostUrl/bot$token"
+}
\ No newline at end of file
diff --git a/src/main/kotlin/com/github/insanusmokrassar/TelegramBotAPI/bot/DefaultRequestsExecutor.kt b/src/main/kotlin/com/github/insanusmokrassar/TelegramBotAPI/bot/DefaultRequestsExecutor.kt
deleted file mode 100644
index dd1ac11d42..0000000000
--- a/src/main/kotlin/com/github/insanusmokrassar/TelegramBotAPI/bot/DefaultRequestsExecutor.kt
+++ /dev/null
@@ -1,16 +0,0 @@
-package com.github.insanusmokrassar.TelegramBotAPI.bot
-
-import kotlinx.coroutines.CoroutineScope
-import kotlinx.coroutines.asCoroutineDispatcher
-import java.util.concurrent.Executors
-
-abstract class BaseRequestsExecutor(
-    token: String,
-    hostUrl: String = "https://api.telegram.org"
-) : RequestsExecutor {
-    protected val baseUrl: String = "$hostUrl/bot$token"
-
-    protected val scope: CoroutineScope = CoroutineScope(
-        Executors.newSingleThreadExecutor().asCoroutineDispatcher()
-    )
-}
\ No newline at end of file
diff --git a/src/main/kotlin/com/github/insanusmokrassar/TelegramBotAPI/bot/Ktor/KtorRequestsExecutor.kt b/src/main/kotlin/com/github/insanusmokrassar/TelegramBotAPI/bot/Ktor/KtorRequestsExecutor.kt
index 5b3ec01f38..7660088d98 100644
--- a/src/main/kotlin/com/github/insanusmokrassar/TelegramBotAPI/bot/Ktor/KtorRequestsExecutor.kt
+++ b/src/main/kotlin/com/github/insanusmokrassar/TelegramBotAPI/bot/Ktor/KtorRequestsExecutor.kt
@@ -4,6 +4,8 @@ import com.github.insanusmokrassar.TelegramBotAPI.bot.BaseRequestsExecutor
 import com.github.insanusmokrassar.TelegramBotAPI.bot.Ktor.base.MultipartRequestCallFactory
 import com.github.insanusmokrassar.TelegramBotAPI.bot.Ktor.base.SimpleRequestCallFactory
 import com.github.insanusmokrassar.TelegramBotAPI.bot.RequestException
+import com.github.insanusmokrassar.TelegramBotAPI.bot.settings.limiters.EmptyLimiter
+import com.github.insanusmokrassar.TelegramBotAPI.bot.settings.limiters.RequestLimiter
 import com.github.insanusmokrassar.TelegramBotAPI.requests.abstracts.Request
 import com.github.insanusmokrassar.TelegramBotAPI.types.ResponseParameters
 import io.ktor.client.HttpClient
@@ -19,7 +21,8 @@ class KtorRequestsExecutor(
     private val client: HttpClient = HttpClient(OkHttp),
     hostUrl: String = "https://api.telegram.org",
     callsFactories: List<KtorCallFactory> = emptyList(),
-    excludeDefaultFactories: Boolean = false
+    excludeDefaultFactories: Boolean = false,
+    private val requestsLimiter: RequestLimiter = EmptyLimiter
 ) : BaseRequestsExecutor(token, hostUrl) {
     constructor(
         token: String,
@@ -40,30 +43,32 @@ class KtorRequestsExecutor(
     }
 
     override suspend fun <T : Any> execute(request: Request<T>): T {
-        var call: HttpClientCall? = null
-        for (factory in callsFactories) {
-            call = factory.prepareCall(
-                client,
-                baseUrl,
-                request
-            )
-            if (call != null) {
-                break
+        return requestsLimiter.limit {
+            var call: HttpClientCall? = null
+            for (factory in callsFactories) {
+                call = factory.prepareCall(
+                    client,
+                    baseUrl,
+                    request
+                )
+                if (call != null) {
+                    break
+                }
             }
-        }
-        if (call == null) {
-            throw IllegalArgumentException("Can't execute request: $request")
-        }
-        val content = call.response.content.toByteArray().toString(Charset.defaultCharset())
-        val responseObject = JSON.parse(
-            ResponseParameters.serializer(request.resultSerializer()),
-            content
-        )
-        return responseObject.result ?: call.let {
-            throw RequestException(
-                responseObject,
-                "Can't get result object"
+            if (call == null) {
+                throw IllegalArgumentException("Can't execute request: $request")
+            }
+            val content = call.response.content.toByteArray().toString(Charset.defaultCharset())
+            val responseObject = JSON.parse(
+                ResponseParameters.serializer(request.resultSerializer()),
+                content
             )
+            responseObject.result ?: call.let {
+                throw RequestException(
+                    responseObject,
+                    "Can't get result object"
+                )
+            }
         }
     }
 }
diff --git a/src/main/kotlin/com/github/insanusmokrassar/TelegramBotAPI/bot/Ktor/ProxySettings.kt b/src/main/kotlin/com/github/insanusmokrassar/TelegramBotAPI/bot/Ktor/ProxySettings.kt
new file mode 100644
index 0000000000..745c4ecdf8
--- /dev/null
+++ b/src/main/kotlin/com/github/insanusmokrassar/TelegramBotAPI/bot/Ktor/ProxySettings.kt
@@ -0,0 +1,32 @@
+package com.github.insanusmokrassar.TelegramBotAPI.bot.Ktor
+
+import com.github.insanusmokrassar.TelegramBotAPI.bot.settings.ProxySettings
+import io.ktor.http.HttpHeaders
+import okhttp3.Credentials
+import okhttp3.OkHttpClient
+import java.net.InetSocketAddress
+import java.net.Proxy
+
+fun OkHttpClient.Builder.useWith(proxySettings: ProxySettings) {
+    proxy(
+        Proxy(
+            Proxy.Type.SOCKS,
+            InetSocketAddress(
+                proxySettings.host,
+                proxySettings.port
+            )
+        )
+    )
+    proxySettings.password ?.let {
+        password ->
+        proxyAuthenticator {
+            _, response ->
+            response.request().newBuilder().apply {
+                addHeader(
+                    HttpHeaders.ProxyAuthorization,
+                    Credentials.basic(proxySettings.username ?: "", password)
+                )
+            }.build()
+        }
+    }
+}
diff --git a/src/main/kotlin/com/github/insanusmokrassar/TelegramBotAPI/bot/ProxySettings.kt b/src/main/kotlin/com/github/insanusmokrassar/TelegramBotAPI/bot/ProxySettings.kt
index 1023292e76..12e3ab9e71 100644
--- a/src/main/kotlin/com/github/insanusmokrassar/TelegramBotAPI/bot/ProxySettings.kt
+++ b/src/main/kotlin/com/github/insanusmokrassar/TelegramBotAPI/bot/ProxySettings.kt
@@ -1,37 +1,18 @@
 package com.github.insanusmokrassar.TelegramBotAPI.bot
 
-import okhttp3.Credentials
+import com.github.insanusmokrassar.TelegramBotAPI.bot.Ktor.useWith
+import com.github.insanusmokrassar.TelegramBotAPI.bot.settings.ProxySettings
 import okhttp3.OkHttpClient
-import java.net.InetSocketAddress
-import java.net.Proxy
 
-data class ProxySettings(
-    val host: String = "localhost",
-    val port: Int = 1080,
-    val username: String? = null,
-    val password: String? = null
+@Deprecated(
+    "Replaced in settings package",
+    ReplaceWith("ProxySettings", "com.github.insanusmokrassar.TelegramBotAPI.bot.settings.ProxySettings")
 )
+typealias ProxySettings = com.github.insanusmokrassar.TelegramBotAPI.bot.settings.ProxySettings
 
-fun OkHttpClient.Builder.useWith(proxySettings: ProxySettings) {
-    proxy(
-        Proxy(
-            Proxy.Type.SOCKS,
-            InetSocketAddress(
-                proxySettings.host,
-                proxySettings.port
-            )
-        )
-    )
-    proxySettings.password ?.let {
-        password ->
-        proxyAuthenticator {
-            _, response ->
-            response.request().newBuilder().apply {
-                addHeader(
-                    "Proxy-Authorization",
-                    Credentials.basic(proxySettings.username ?: "", password)
-                )
-            }.build()
-        }
-    }
-}
+
+@Deprecated(
+    "Replaced in Ktor package",
+    ReplaceWith("useWith", "com.github.insanusmokrassar.TelegramBotAPI.bot.Ktor.useWith")
+)
+fun OkHttpClient.Builder.useWith(proxySettings: ProxySettings) = useWith(proxySettings)
diff --git a/src/main/kotlin/com/github/insanusmokrassar/TelegramBotAPI/bot/settings/ProxySettings.kt b/src/main/kotlin/com/github/insanusmokrassar/TelegramBotAPI/bot/settings/ProxySettings.kt
new file mode 100644
index 0000000000..19dfdec44d
--- /dev/null
+++ b/src/main/kotlin/com/github/insanusmokrassar/TelegramBotAPI/bot/settings/ProxySettings.kt
@@ -0,0 +1,16 @@
+package com.github.insanusmokrassar.TelegramBotAPI.bot.settings
+
+import kotlinx.serialization.Optional
+import kotlinx.serialization.Serializable
+
+@Serializable
+data class ProxySettings(
+    @Optional
+    val host: String = "localhost",
+    @Optional
+    val port: Int = 1080,
+    @Optional
+    val username: String? = null,
+    @Optional
+    val password: String? = null
+)
diff --git a/src/main/kotlin/com/github/insanusmokrassar/TelegramBotAPI/bot/settings/limiters/EmptyLimiter.kt b/src/main/kotlin/com/github/insanusmokrassar/TelegramBotAPI/bot/settings/limiters/EmptyLimiter.kt
new file mode 100644
index 0000000000..c0a24f1885
--- /dev/null
+++ b/src/main/kotlin/com/github/insanusmokrassar/TelegramBotAPI/bot/settings/limiters/EmptyLimiter.kt
@@ -0,0 +1,5 @@
+package com.github.insanusmokrassar.TelegramBotAPI.bot.settings.limiters
+
+object EmptyLimiter : RequestLimiter {
+    override suspend fun <T> limit(block: suspend () -> T): T = block()
+}
diff --git a/src/main/kotlin/com/github/insanusmokrassar/TelegramBotAPI/bot/settings/limiters/PowLimiter.kt b/src/main/kotlin/com/github/insanusmokrassar/TelegramBotAPI/bot/settings/limiters/PowLimiter.kt
new file mode 100644
index 0000000000..da2acc46bf
--- /dev/null
+++ b/src/main/kotlin/com/github/insanusmokrassar/TelegramBotAPI/bot/settings/limiters/PowLimiter.kt
@@ -0,0 +1,75 @@
+package com.github.insanusmokrassar.TelegramBotAPI.bot.settings.limiters
+
+import kotlinx.coroutines.*
+import kotlinx.coroutines.channels.Channel
+import kotlinx.serialization.*
+import java.util.concurrent.Executors
+import kotlin.coroutines.*
+
+private sealed class RequestEvent
+private class AddRequest(
+    val continuation: Continuation<Long>
+) : RequestEvent()
+private object CompleteRequest : RequestEvent()
+
+@Serializable
+data class PowLimiter(
+    @Optional
+    private val minAwaitTime: Long = 0L,
+    @Optional
+    private val maxAwaitTime: Long = 10000L,
+    @Optional
+    private val powValue: Double = 4.0,
+    @Optional
+    private val powK: Double = 0.0016
+) : RequestLimiter {
+    @Transient
+    private val scope = CoroutineScope(
+        Executors.newFixedThreadPool(3).asCoroutineDispatcher()
+    )
+    @Transient
+    private val eventsChannel = Channel<RequestEvent>(Channel.UNLIMITED)
+    @Transient
+    private val awaitTimeRange = minAwaitTime .. maxAwaitTime
+
+    init {
+        scope.launch {
+            var requestsInWork: Double = 0.0
+            for (event in eventsChannel) {
+                when (event) {
+                    is AddRequest -> {
+                        val awaitTime = ((Math.pow(requestsInWork, powValue) * powK) * 1000L).toLong()
+                        requestsInWork++
+
+                        event.continuation.resume(
+                            if (awaitTime in awaitTimeRange) {
+                                awaitTime
+                            } else {
+                                if (awaitTime < minAwaitTime) {
+                                    minAwaitTime
+                                } else {
+                                    maxAwaitTime
+                                }
+                            }
+                        )
+                    }
+                    is CompleteRequest -> requestsInWork--
+                }
+            }
+        }
+    }
+
+    override suspend fun <T> limit(
+        block: suspend () -> T
+    ): T {
+        val delayMillis = suspendCoroutine<Long> {
+            scope.launch { eventsChannel.send(AddRequest(it)) }
+        }
+        delay(delayMillis)
+        return try {
+            block()
+        } finally {
+            eventsChannel.send(CompleteRequest)
+        }
+    }
+}
diff --git a/src/main/kotlin/com/github/insanusmokrassar/TelegramBotAPI/bot/settings/limiters/RequestLimiter.kt b/src/main/kotlin/com/github/insanusmokrassar/TelegramBotAPI/bot/settings/limiters/RequestLimiter.kt
new file mode 100644
index 0000000000..8abc707151
--- /dev/null
+++ b/src/main/kotlin/com/github/insanusmokrassar/TelegramBotAPI/bot/settings/limiters/RequestLimiter.kt
@@ -0,0 +1,8 @@
+package com.github.insanusmokrassar.TelegramBotAPI.bot.settings.limiters
+
+interface RequestLimiter {
+    /**
+     * Use limit for working of block (like delay between or after, for example)
+     */
+    suspend fun <T> limit(block: suspend () -> T): T
+}
diff --git a/src/main/kotlin/com/github/insanusmokrassar/TelegramBotAPI/requests/GetMe.kt b/src/main/kotlin/com/github/insanusmokrassar/TelegramBotAPI/requests/GetMe.kt
index d32001e0dd..ae0b4eb48d 100644
--- a/src/main/kotlin/com/github/insanusmokrassar/TelegramBotAPI/requests/GetMe.kt
+++ b/src/main/kotlin/com/github/insanusmokrassar/TelegramBotAPI/requests/GetMe.kt
@@ -3,7 +3,9 @@ package com.github.insanusmokrassar.TelegramBotAPI.requests
 import com.github.insanusmokrassar.TelegramBotAPI.requests.abstracts.SimpleRequest
 import com.github.insanusmokrassar.TelegramBotAPI.types.User
 import kotlinx.serialization.KSerializer
+import kotlinx.serialization.Serializable
 
+@Serializable
 class GetMe : SimpleRequest<User> {
     override fun method(): String = "getMe"
     override fun resultSerializer(): KSerializer<User> = User.serializer()