diff --git a/src/main/kotlin/com/github/insanusmokrassar/SauceNaoAPI/additional/Utils.kt b/src/main/kotlin/com/github/insanusmokrassar/SauceNaoAPI/additional/Utils.kt
new file mode 100644
index 0000000..79e8bb1
--- /dev/null
+++ b/src/main/kotlin/com/github/insanusmokrassar/SauceNaoAPI/additional/Utils.kt
@@ -0,0 +1,9 @@
+package com.github.insanusmokrassar.SauceNaoAPI.additional
+
+typealias AccountType = Int
+const val defaultAccountType: AccountType = 1 // "basic"
+
+typealias UserId = Int
+
+const val SHORT_TIME_RECALCULATING_MILLIS = 30 * 1000
+const val LONG_TIME_RECALCULATING_MILLIS = 24 * 60 * 60 * 1000
diff --git a/src/main/kotlin/com/github/insanusmokrassar/SauceNaoAPI/additional/header/AccountInfo.kt b/src/main/kotlin/com/github/insanusmokrassar/SauceNaoAPI/additional/header/AccountInfo.kt
new file mode 100644
index 0000000..710c286
--- /dev/null
+++ b/src/main/kotlin/com/github/insanusmokrassar/SauceNaoAPI/additional/header/AccountInfo.kt
@@ -0,0 +1,43 @@
+package com.github.insanusmokrassar.SauceNaoAPI.additional.header
+
+import com.github.insanusmokrassar.SauceNaoAPI.additional.*
+import com.github.insanusmokrassar.SauceNaoAPI.models.Header
+
+val Header.shortLimitStatus: LimitStatus
+    get() = LimitStatus(
+        shortRemaining ?: Int.MAX_VALUE,
+        shortLimit ?: Int.MAX_VALUE
+    )
+
+val Header.longLimitStatus: LimitStatus
+    get() = LimitStatus(
+        longRemaining ?: Int.MAX_VALUE,
+        longLimit ?: Int.MAX_VALUE
+    )
+
+val Header.limits
+    get() = Limits(shortLimitStatus, longLimitStatus)
+
+val Header.accountInfo
+    get() = AccountInfo(
+        accountType ?: defaultAccountType,
+        userId,
+        limits
+    )
+
+
+data class LimitStatus(
+    val remain: Int = Int.MAX_VALUE,
+    val limit: Int = Int.MAX_VALUE
+)
+
+data class Limits(
+    val short: LimitStatus = LimitStatus(),
+    val long: LimitStatus = LimitStatus()
+)
+
+data class AccountInfo(
+    val accountType: AccountType = defaultAccountType,
+    val userId: UserId? = null,
+    val limits: Limits = Limits()
+)
diff --git a/src/main/kotlin/com/github/insanusmokrassar/SauceNaoAPI/additional/header/IndexInfo.kt b/src/main/kotlin/com/github/insanusmokrassar/SauceNaoAPI/additional/header/IndexInfo.kt
new file mode 100644
index 0000000..109939f
--- /dev/null
+++ b/src/main/kotlin/com/github/insanusmokrassar/SauceNaoAPI/additional/header/IndexInfo.kt
@@ -0,0 +1,24 @@
+package com.github.insanusmokrassar.SauceNaoAPI.additional.header
+
+import com.github.insanusmokrassar.SauceNaoAPI.models.Header
+
+data class IndexInfo(
+    val id: Int,
+    val status: Int = 500,
+    val results: Int = 0,
+    val parent_id: Int? = null
+)
+
+val Header.adaptedIndexes: List<IndexInfo>
+    get() = indexes.mapNotNull {
+        it ?.let { _ ->
+            it.id ?.let { id ->
+                IndexInfo(
+                    id,
+                    it.status ?: 500, // Serverside error if not set
+                    it.results ?: 0,
+                    it.parent_id
+                )
+            }
+        }
+    }
diff --git a/src/main/kotlin/com/github/insanusmokrassar/SauceNaoAPI/additional/header/QueryResultsMetainfo.kt b/src/main/kotlin/com/github/insanusmokrassar/SauceNaoAPI/additional/header/QueryResultsMetainfo.kt
new file mode 100644
index 0000000..69e3c8f
--- /dev/null
+++ b/src/main/kotlin/com/github/insanusmokrassar/SauceNaoAPI/additional/header/QueryResultsMetainfo.kt
@@ -0,0 +1,37 @@
+package com.github.insanusmokrassar.SauceNaoAPI.additional.header
+
+import com.github.insanusmokrassar.SauceNaoAPI.models.Header
+
+val Header.queryPreview
+    get() = QueryResultPreview(
+        queryImageDisplay,
+        queryImage
+    )
+
+val Header.queryResults
+    get() = QueryResultsMetainfo(
+        status ?: 500, // server_side error if status field was not set up
+        resultsCount ?: 0,
+        minSimilarity ?: 0F,
+        searchDepth ?: 128,
+        queryPreview,
+        adaptedIndexes
+    )
+
+data class QueryResultPreview(
+    val imageDisplay: String? = null, // something like "userdata/uuid.png",
+    val image: String? = null // something like "uuid.jpg"
+)
+
+data class QueryResultsMetainfo(
+    val status: Int = 0,
+    val count: Int = 0,
+    val minSimilarity: Float = 0F,
+    val searchDepth: Int = 128,
+    val preview: QueryResultPreview = QueryResultPreview(),
+    val indexesInfo: List<IndexInfo> = emptyList()
+) {
+    val isOk: Boolean = status == 0
+    val isClientSideError = status < 0
+    val isServerSideError = status > 0
+}
diff --git a/src/main/kotlin/com/github/insanusmokrassar/SauceNaoAPI/additional/header/ResultMetainfo.kt b/src/main/kotlin/com/github/insanusmokrassar/SauceNaoAPI/additional/header/ResultMetainfo.kt
new file mode 100644
index 0000000..61721fc
--- /dev/null
+++ b/src/main/kotlin/com/github/insanusmokrassar/SauceNaoAPI/additional/header/ResultMetainfo.kt
@@ -0,0 +1,14 @@
+package com.github.insanusmokrassar.SauceNaoAPI.additional.header
+
+import com.github.insanusmokrassar.SauceNaoAPI.models.Header
+
+data class ResultMetainfo(
+    val accountInfo: AccountInfo = AccountInfo(),
+    val resultsInfo: QueryResultsMetainfo = QueryResultsMetainfo()
+)
+
+val Header.adapted
+    get() = ResultMetainfo(
+        accountInfo,
+        queryResults
+    )
diff --git a/src/main/kotlin/com/github/insanusmokrassar/SauceNaoAPI/models/Header.kt b/src/main/kotlin/com/github/insanusmokrassar/SauceNaoAPI/models/Header.kt
index b3a87a5..8406825 100644
--- a/src/main/kotlin/com/github/insanusmokrassar/SauceNaoAPI/models/Header.kt
+++ b/src/main/kotlin/com/github/insanusmokrassar/SauceNaoAPI/models/Header.kt
@@ -8,22 +8,22 @@ import kotlinx.serialization.json.Json
 @Serializable
 data class Header(
     @SerialName("status")
-    val status: Int,
+    val status: Int? = null,
     @SerialName("results_requested")
-    val resultsRequested: Int,
+    val resultsRequested: Int? = null,
     @Serializable(IndexesSerializer::class)
     @SerialName("index")
-    val indexes: List<HeaderIndex?>,
+    val indexes: List<HeaderIndex?> = emptyList(),
     @SerialName("search_depth")
-    val searchDepth: Int,
+    val searchDepth: Int? = null,
     @SerialName("minimum_similarity")
-    val minSimilarity: Float,
-    @SerialName("query_image_display")
-    val queryImageDisplay: String, // something like "userdata/uuid.png",
-    @SerialName("query_image")
-    val queryImage: String, // something like "uuid.jpg"
+    val minSimilarity: Float? = null,
     @SerialName("results_returned")
-    val resultsCount: Int,
+    val resultsCount: Int? = null,
+    @SerialName("query_image_display")
+    val queryImageDisplay: String? = null, // something like "userdata/uuid.png",
+    @SerialName("query_image")
+    val queryImage: String? = null, // something like "uuid.jpg"
     @SerialName("short_remaining")
     val shortRemaining: Int? = null,
     @SerialName("long_remaining")
@@ -33,7 +33,7 @@ data class Header(
     @SerialName("long_limit")
     val longLimit: Int? = null,
     @SerialName("account_type")
-    val accountType: String? = null,
+    val accountType: Int? = null,
     @SerialName("user_id")
     val userId: Int? = null
 )
diff --git a/src/main/kotlin/com/github/insanusmokrassar/SauceNaoAPI/models/HeaderIndex.kt b/src/main/kotlin/com/github/insanusmokrassar/SauceNaoAPI/models/HeaderIndex.kt
index dfc37ba..c34b0b7 100644
--- a/src/main/kotlin/com/github/insanusmokrassar/SauceNaoAPI/models/HeaderIndex.kt
+++ b/src/main/kotlin/com/github/insanusmokrassar/SauceNaoAPI/models/HeaderIndex.kt
@@ -4,8 +4,8 @@ import kotlinx.serialization.Serializable
 
 @Serializable
 data class HeaderIndex(
-    val status: Int,
-    val id: Int,
-    val results: Int = 0,
+    val status: Int? = null,
+    val id: Int? = null,
+    val results: Int? = null,
     val parent_id: Int? = null
 )