diff --git a/bitcoincashkit/src/main/kotlin/io/horizontalsystems/bitcoincash/BitcoinCashKit.kt b/bitcoincashkit/src/main/kotlin/io/horizontalsystems/bitcoincash/BitcoinCashKit.kt
index f8fe5cdc..d65cfedf 100644
--- a/bitcoincashkit/src/main/kotlin/io/horizontalsystems/bitcoincash/BitcoinCashKit.kt
+++ b/bitcoincashkit/src/main/kotlin/io/horizontalsystems/bitcoincash/BitcoinCashKit.kt
@@ -260,7 +260,7 @@ class BitcoinCashKit : AbstractKit {
             is NetworkType.MainNet -> {
 
                 if (syncMode is SyncMode.Blockchair) {
-                    val blockchairApi = BlockchairApi(syncMode.key, network.blockchairChainId)
+                    val blockchairApi = BlockchairApi(network.blockchairChainId)
                     val blockchairBlockHashFetcher = BlockchairBlockHashFetcher(blockchairApi)
                     val blockHashFetcher = BlockHashFetcher(hsBlockHashFetcher, blockchairBlockHashFetcher, checkpoint.block.height)
                     val blockchairProvider = BlockchairTransactionProvider(blockchairApi, blockHashFetcher)
@@ -305,7 +305,7 @@ class BitcoinCashKit : AbstractKit {
             "BitcoinCash-${networkType.description}-$walletId-${syncMode.javaClass.simpleName}"
 
         fun clear(context: Context, networkType: NetworkType, walletId: String) {
-            for (syncMode in listOf(SyncMode.Api(), SyncMode.Full(), SyncMode.Blockchair(""))) {
+            for (syncMode in listOf(SyncMode.Api(), SyncMode.Full(), SyncMode.Blockchair())) {
                 try {
                     SQLiteDatabase.deleteDatabase(context.getDatabasePath(getDatabaseName(networkType, walletId, syncMode)))
                 } catch (ex: Exception) {
diff --git a/bitcoincore/src/main/kotlin/io/horizontalsystems/bitcoincore/BitcoinCore.kt b/bitcoincore/src/main/kotlin/io/horizontalsystems/bitcoincore/BitcoinCore.kt
index c7a7e67f..7cfaf98a 100644
--- a/bitcoincore/src/main/kotlin/io/horizontalsystems/bitcoincore/BitcoinCore.kt
+++ b/bitcoincore/src/main/kotlin/io/horizontalsystems/bitcoincore/BitcoinCore.kt
@@ -478,7 +478,7 @@ class BitcoinCore(
     sealed class SyncMode {
         class Full : SyncMode()
         class Api : SyncMode()
-        class Blockchair(val key: String) : SyncMode()
+        class Blockchair : SyncMode()
     }
 
     sealed class StateError : Exception() {
diff --git a/bitcoincore/src/main/kotlin/io/horizontalsystems/bitcoincore/BitcoinCoreBuilder.kt b/bitcoincore/src/main/kotlin/io/horizontalsystems/bitcoincore/BitcoinCoreBuilder.kt
index bc930fca..53e7aec6 100644
--- a/bitcoincore/src/main/kotlin/io/horizontalsystems/bitcoincore/BitcoinCoreBuilder.kt
+++ b/bitcoincore/src/main/kotlin/io/horizontalsystems/bitcoincore/BitcoinCoreBuilder.kt
@@ -399,7 +399,7 @@ class BitcoinCoreBuilder {
                 val blockchairApi = if (apiTransactionProvider is BlockchairTransactionProvider) {
                     apiTransactionProvider.blockchairApi
                 } else {
-                    BlockchairApi(syncMode.key, network.blockchairChainId)
+                    BlockchairApi(network.blockchairChainId)
                 }
                 val lastBlockProvider = BlockchairLastBlockProvider(blockchairApi)
                 apiSyncer = BlockchairApiSyncer(
diff --git a/bitcoincore/src/main/kotlin/io/horizontalsystems/bitcoincore/apisync/blockchair/BlockchairApi.kt b/bitcoincore/src/main/kotlin/io/horizontalsystems/bitcoincore/apisync/blockchair/BlockchairApi.kt
index 929fe07e..3af0574c 100644
--- a/bitcoincore/src/main/kotlin/io/horizontalsystems/bitcoincore/apisync/blockchair/BlockchairApi.kt
+++ b/bitcoincore/src/main/kotlin/io/horizontalsystems/bitcoincore/apisync/blockchair/BlockchairApi.kt
@@ -12,10 +12,9 @@ import java.util.Locale
 import java.util.TimeZone
 
 class BlockchairApi(
-    private val secretKey: String,
     private val chainId: String,
 ) {
-    private val apiManager = ApiManager("https://api.blockchair.com")
+    private val apiManager = ApiManager("https://api.blocksdecoded.com/v1/blockchair")
     private val limit = 10000
     private val dateFormat = SimpleDateFormat("yyyy-MM-dd HH:mm:ss", Locale.getDefault())
 
@@ -64,7 +63,7 @@ class BlockchairApi(
     }
 
     fun lastBlockHeader(): BlockHeaderItem {
-        val params = "?limit=0&key=$secretKey"
+        val params = "?limit=0"
         val url = "$chainId/stats"
         val response = apiManager.doOkHttpGet(url + params).asObject()
         val data = response.get("data").asObject()
@@ -84,7 +83,7 @@ class BlockchairApi(
         receivedTransactionItems: List<Transaction> = emptyList()
     ): Pair<List<AddressItem>, List<Transaction>> {
         try {
-            val params = "?transaction_details=true&limit=$limit,0&offset=${receivedTransactionItems.size}&key=$secretKey"
+            val params = "?transaction_details=true&limit=$limit,0&offset=${receivedTransactionItems.size}"
             val url = "$chainId/dashboards/addresses/${addresses.joinToString(separator = ",")}"
             val response = apiManager.doOkHttpGet(url + params).asObject()
             val data = response.get("data").asObject()
@@ -134,7 +133,7 @@ class BlockchairApi(
 
     private fun fetchBlockHashes(heights: List<Int>): Map<Int, String> {
         try {
-            val params = "?limit=0&key=$secretKey"
+            val params = "?limit=0"
             val url = "$chainId/dashboards/blocks/${heights.joinToString(separator = ",")}"
             val response = apiManager.doOkHttpGet(url + params).asObject()
 
diff --git a/bitcoinkit/src/main/kotlin/io/horizontalsystems/bitcoinkit/BitcoinKit.kt b/bitcoinkit/src/main/kotlin/io/horizontalsystems/bitcoinkit/BitcoinKit.kt
index b6015370..81533a1f 100644
--- a/bitcoinkit/src/main/kotlin/io/horizontalsystems/bitcoinkit/BitcoinKit.kt
+++ b/bitcoinkit/src/main/kotlin/io/horizontalsystems/bitcoinkit/BitcoinKit.kt
@@ -318,7 +318,7 @@ class BitcoinKit : AbstractKit {
         NetworkType.MainNet -> {
             val hsBlockHashFetcher = HsBlockHashFetcher("https://api.blocksdecoded.com/v1/blockchains/bitcoin")
             if (syncMode is SyncMode.Blockchair) {
-                val blockchairApi = BlockchairApi(syncMode.key, network.blockchairChainId)
+                val blockchairApi = BlockchairApi(network.blockchairChainId)
                 val blockchairBlockHashFetcher = BlockchairBlockHashFetcher(blockchairApi)
                 val blockHashFetcher = BlockHashFetcher(hsBlockHashFetcher, blockchairBlockHashFetcher, checkpoint.block.height)
                 val blockchairProvider = BlockchairTransactionProvider(blockchairApi, blockHashFetcher)
@@ -367,7 +367,7 @@ class BitcoinKit : AbstractKit {
          * @param walletId The string wallet ID of the BitcoinKit.
          */
         fun clear(context: Context, networkType: NetworkType, walletId: String) {
-            for (syncMode in listOf(SyncMode.Api(), SyncMode.Full(), SyncMode.Blockchair(""))) {
+            for (syncMode in listOf(SyncMode.Api(), SyncMode.Full(), SyncMode.Blockchair())) {
                 for (purpose in Purpose.values()) try {
                     SQLiteDatabase.deleteDatabase(context.getDatabasePath(getDatabaseName(networkType, walletId, syncMode, purpose)))
                 } catch (ex: Exception) {
diff --git a/dashkit/src/main/kotlin/io/horizontalsystems/dashkit/DashKit.kt b/dashkit/src/main/kotlin/io/horizontalsystems/dashkit/DashKit.kt
index bf065342..82aa8734 100644
--- a/dashkit/src/main/kotlin/io/horizontalsystems/dashkit/DashKit.kt
+++ b/dashkit/src/main/kotlin/io/horizontalsystems/dashkit/DashKit.kt
@@ -291,7 +291,7 @@ class DashKit : AbstractKit, IInstantTransactionDelegate, BitcoinCore.Listener {
             val insightApiProvider = InsightApi("https://insight.dash.org/insight-api")
 
             if (syncMode is SyncMode.Blockchair) {
-                val blockchairApi = BlockchairApi(syncMode.key, network.blockchairChainId)
+                val blockchairApi = BlockchairApi(network.blockchairChainId)
                 val blockchairBlockHashFetcher = BlockchairBlockHashFetcher(blockchairApi)
                 val blockchairProvider = BlockchairTransactionProvider(blockchairApi, blockchairBlockHashFetcher)
 
@@ -384,7 +384,7 @@ class DashKit : AbstractKit, IInstantTransactionDelegate, BitcoinCore.Listener {
         }
 
         fun clear(context: Context, networkType: NetworkType, walletId: String) {
-            for (syncMode in listOf(SyncMode.Api(), SyncMode.Full(), SyncMode.Blockchair(""))) {
+            for (syncMode in listOf(SyncMode.Api(), SyncMode.Full(), SyncMode.Blockchair())) {
                 try {
                     SQLiteDatabase.deleteDatabase(context.getDatabasePath(getDatabaseNameCore(networkType, walletId, syncMode)))
                     SQLiteDatabase.deleteDatabase(context.getDatabasePath(getDatabaseName(networkType, walletId, syncMode)))
diff --git a/ecashkit/src/main/kotlin/io/horizontalsystems/ecash/ECashKit.kt b/ecashkit/src/main/kotlin/io/horizontalsystems/ecash/ECashKit.kt
index 88a114f4..54fdded6 100644
--- a/ecashkit/src/main/kotlin/io/horizontalsystems/ecash/ECashKit.kt
+++ b/ecashkit/src/main/kotlin/io/horizontalsystems/ecash/ECashKit.kt
@@ -239,7 +239,7 @@ class ECashKit : AbstractKit {
         NetworkType.MainNet -> {
             val chronikApiProvider = ChronikApi()
             if (syncMode is SyncMode.Blockchair) {
-                val blockchairApi = BlockchairApi(syncMode.key, network.blockchairChainId)
+                val blockchairApi = BlockchairApi(network.blockchairChainId)
                 val blockchairBlockHashFetcher = BlockchairBlockHashFetcher(blockchairApi)
                 val blockchairProvider = BlockchairTransactionProvider(blockchairApi, blockchairBlockHashFetcher)
 
@@ -280,7 +280,7 @@ class ECashKit : AbstractKit {
             "ECash-${networkType.name}-$walletId-${syncMode.javaClass.simpleName}"
 
         fun clear(context: Context, networkType: NetworkType, walletId: String) {
-            for (syncMode in listOf(SyncMode.Api(), SyncMode.Full(), SyncMode.Blockchair(""))) {
+            for (syncMode in listOf(SyncMode.Api(), SyncMode.Full(), SyncMode.Blockchair())) {
                 try {
                     SQLiteDatabase.deleteDatabase(context.getDatabasePath(getDatabaseName(networkType, walletId, syncMode)))
                 } catch (ex: Exception) {
diff --git a/litecoinkit/src/main/kotlin/io/horizontalsystems/litecoinkit/LitecoinKit.kt b/litecoinkit/src/main/kotlin/io/horizontalsystems/litecoinkit/LitecoinKit.kt
index 553cbd9e..3bedbd49 100644
--- a/litecoinkit/src/main/kotlin/io/horizontalsystems/litecoinkit/LitecoinKit.kt
+++ b/litecoinkit/src/main/kotlin/io/horizontalsystems/litecoinkit/LitecoinKit.kt
@@ -266,7 +266,7 @@ class LitecoinKit : AbstractKit {
             val bCoinApiProvider = BCoinApi("https://ltc.blocksdecoded.com/api")
 
             if (syncMode is SyncMode.Blockchair) {
-                val blockchairApi = BlockchairApi(syncMode.key, network.blockchairChainId)
+                val blockchairApi = BlockchairApi(network.blockchairChainId)
                 val blockchairBlockHashFetcher = BlockchairBlockHashFetcher(blockchairApi)
                 val blockchairProvider = BlockchairTransactionProvider(blockchairApi, blockchairBlockHashFetcher)
 
@@ -301,7 +301,7 @@ class LitecoinKit : AbstractKit {
             "Litecoin-${networkType.name}-$walletId-${syncMode.javaClass.simpleName}-${purpose.name}"
 
         fun clear(context: Context, networkType: NetworkType, walletId: String) {
-            for (syncMode in listOf(SyncMode.Api(), SyncMode.Full(), SyncMode.Blockchair(""))) {
+            for (syncMode in listOf(SyncMode.Api(), SyncMode.Full(), SyncMode.Blockchair())) {
                 for (purpose in Purpose.values())
                     try {
                         SQLiteDatabase.deleteDatabase(context.getDatabasePath(getDatabaseName(networkType, walletId, syncMode, purpose)))