diff --git a/docs/04-upstream-config.adoc b/docs/04-upstream-config.adoc
index 7f0b2b73..54850a68 100644
--- a/docs/04-upstream-config.adoc
+++ b/docs/04-upstream-config.adoc
@@ -151,6 +151,12 @@ Currently, dshackle supports next chains (should be used as chain names in confi
 - base-goerli
 - linea
 - linea-goerli
+- fantom
+- fantom-testnet
+- gnosis
+- gnosis-chiado
+- avalanche
+- avalanche-fuji
 
 === Roles and Fallback upstream
 
diff --git a/emerald-grpc b/emerald-grpc
index 1afdf11b..3a5a63d6 160000
--- a/emerald-grpc
+++ b/emerald-grpc
@@ -1 +1 @@
-Subproject commit 1afdf11bbfb439eb4cd30a85cec3bc5996b34d10
+Subproject commit 3a5a63d618f5c4e920d51d3400297a62838ceb96
diff --git a/src/main/kotlin/io/emeraldpay/dshackle/BlockchainType.kt b/src/main/kotlin/io/emeraldpay/dshackle/BlockchainType.kt
index 5efd0955..26a6a468 100644
--- a/src/main/kotlin/io/emeraldpay/dshackle/BlockchainType.kt
+++ b/src/main/kotlin/io/emeraldpay/dshackle/BlockchainType.kt
@@ -4,46 +4,21 @@ enum class BlockchainType {
     BITCOIN, EVM_POW, EVM_POS;
 
     companion object {
+
+        val pow = setOf(
+            Chain.ETHEREUM_CLASSIC__MAINNET, Chain.RSK__MAINNET, Chain.ETHEREUM__KOVAN,
+            Chain.ETHEREUM__MORDEN, Chain.ETHEREUM__RINKEBY
+        )
+        val bitcoin = setOf(Chain.BITCOIN__MAINNET, Chain.BITCOIN__TESTNET)
         @JvmStatic
         fun from(chain: Chain): BlockchainType {
-            if (chain == Chain.ETHEREUM__ROPSTEN ||
-                chain == Chain.POLYGON_POS__MAINNET ||
-                chain == Chain.OPTIMISM__MAINNET ||
-                chain == Chain.ARBITRUM__MAINNET ||
-                chain == Chain.BSC__MAINNET ||
-                chain == Chain.ETHEREUM__GOERLI ||
-                chain == Chain.ETHEREUM__MAINNET ||
-                chain == Chain.ETHEREUM__SEPOLIA ||
-                chain == Chain.ARBITRUM__GOERLI ||
-                chain == Chain.OPTIMISM__GOERLI ||
-                chain == Chain.ARBITRUM_NOVA__MAINNET ||
-                chain == Chain.POLYGON_ZKEVM__MAINNET ||
-                chain == Chain.POLYGON_ZKEVM__TESTNET ||
-                chain == Chain.ZKSYNC__MAINNET ||
-                chain == Chain.ZKSYNC__TESTNET ||
-                chain == Chain.POLYGON_POS__MUMBAI ||
-                chain == Chain.BASE__MAINNET ||
-                chain == Chain.BASE__GOERLI ||
-                chain == Chain.LINEA__MAINNET ||
-                chain == Chain.LINEA__GOERLI
-            ) {
-                return EVM_POS
+            return if (pow.contains(chain)) {
+                EVM_POW
+            } else if (bitcoin.contains(chain)) {
+                BITCOIN
+            } else {
+                EVM_POS
             }
-            if (chain == Chain.ETHEREUM_CLASSIC__MAINNET ||
-                chain == Chain.FANTOM__MAINNET ||
-                chain == Chain.RSK__MAINNET ||
-                chain == Chain.ETHEREUM__KOVAN ||
-                chain == Chain.ETHEREUM__MORDEN ||
-                chain == Chain.ETHEREUM__RINKEBY
-            ) {
-                return EVM_POW
-            }
-            if (chain == Chain.BITCOIN__MAINNET ||
-                chain == Chain.BITCOIN__TESTNET
-            ) {
-                return BITCOIN
-            }
-            throw IllegalArgumentException("Unknown type of blockchain: $chain")
         }
     }
 }
diff --git a/src/main/kotlin/io/emeraldpay/dshackle/Chain.kt b/src/main/kotlin/io/emeraldpay/dshackle/Chain.kt
index 6d4baa1d..bb0e5489 100644
--- a/src/main/kotlin/io/emeraldpay/dshackle/Chain.kt
+++ b/src/main/kotlin/io/emeraldpay/dshackle/Chain.kt
@@ -49,6 +49,8 @@ enum class Chain(val id: Int, val chainCode: String, val chainName: String) {
     ZKSYNC__MAINNET(1009, "ZKSYNC", "ZkSync Era"),
     BASE__MAINNET(1010, "BASE", "Base"),
     LINEA__MAINNET(1011, "LINEA", "Linea"),
+    GNOSIS__MAINNET(1012, "GNOSIS", "Gnosis"),
+    AVALANCHE__MAINNET(1013, "AVALANCHE", "Avalanche"),
 
     // Testnets
     ETHEREUM__MORDEN(10001, "MORDEN", "Morden Testnet"),
@@ -88,7 +90,10 @@ enum class Chain(val id: Int, val chainCode: String, val chainName: String) {
         "Polygon POS Mumbai Testnet"
     ),
     BASE__GOERLI(10014, "BASE_GOERLI", "Base Goerli Testnet"),
-    LINEA__GOERLI(10015, "LINEA_GOERLI", "Linea Goerli Testnet");
+    LINEA__GOERLI(10015, "LINEA_GOERLI", "Linea Goerli Testnet"),
+    FANTOM__TESTNET(10016, "FANTOM_TESTNET", "Fantom Testnet"),
+    GNOSIS__CHIADO(10017, "GNOSIS_CHIADO", "Gnosis Chiado Testnet"),
+    AVALANCHE__FUJI(10018, "AVALANCHE_FUJI", "Avalanche Fuji Testnet");
 
     companion object {
         fun byId(id: Int): Chain {
diff --git a/src/main/kotlin/io/emeraldpay/dshackle/Global.kt b/src/main/kotlin/io/emeraldpay/dshackle/Global.kt
index f05ed86e..f501d052 100644
--- a/src/main/kotlin/io/emeraldpay/dshackle/Global.kt
+++ b/src/main/kotlin/io/emeraldpay/dshackle/Global.kt
@@ -81,6 +81,12 @@ class Global {
             "base-goerli" to Chain.BASE__GOERLI,
             "linea" to Chain.LINEA__MAINNET,
             "linea-goerli" to Chain.LINEA__GOERLI,
+            "fantom" to Chain.FANTOM__MAINNET,
+            "fantom-testnet" to Chain.FANTOM__TESTNET,
+            "gnosis" to Chain.GNOSIS__MAINNET,
+            "gnosis-chiado" to Chain.GNOSIS__CHIADO,
+            "avalanche" to Chain.AVALANCHE__MAINNET,
+            "avalanche-fuji" to Chain.AVALANCHE__FUJI,
         )
 
         fun chainById(id: String?): Chain {
diff --git a/src/main/kotlin/io/emeraldpay/dshackle/upstream/calls/DefaultEthereumMethods.kt b/src/main/kotlin/io/emeraldpay/dshackle/upstream/calls/DefaultEthereumMethods.kt
index 20b5f02f..1c54280f 100644
--- a/src/main/kotlin/io/emeraldpay/dshackle/upstream/calls/DefaultEthereumMethods.kt
+++ b/src/main/kotlin/io/emeraldpay/dshackle/upstream/calls/DefaultEthereumMethods.kt
@@ -104,6 +104,15 @@ class DefaultEthereumMethods(
 
             Chain.LINEA__MAINNET to HardcodedData("\"59144\"", "\"0xe708\""),
             Chain.LINEA__GOERLI to HardcodedData("\"59140\"", "\"0xe704\""),
+
+            Chain.FANTOM__MAINNET to HardcodedData("\"250\"", "\"0xfa\""),
+            Chain.FANTOM__TESTNET to HardcodedData("\"4002\"", "\"0xfa2\""),
+
+            Chain.GNOSIS__MAINNET to HardcodedData("\"100\"", "\"0x64\""),
+            Chain.GNOSIS__CHIADO to HardcodedData("\"10200\"", "\"0x27d8\""),
+
+            Chain.AVALANCHE__MAINNET to HardcodedData("\"43114\"", "\"0xa86a\""),
+            Chain.AVALANCHE__FUJI to HardcodedData("\"43113\"", "\"0xa869\""),
         )
 
         fun getChainByData(data: HardcodedData) = CHAIN_DATA.entries.find { it.value == data }?.key
diff --git a/src/main/kotlin/io/emeraldpay/dshackle/upstream/ethereum/EthereumUpstreamValidator.kt b/src/main/kotlin/io/emeraldpay/dshackle/upstream/ethereum/EthereumUpstreamValidator.kt
index 997cda8f..07cb3fc4 100644
--- a/src/main/kotlin/io/emeraldpay/dshackle/upstream/ethereum/EthereumUpstreamValidator.kt
+++ b/src/main/kotlin/io/emeraldpay/dshackle/upstream/ethereum/EthereumUpstreamValidator.kt
@@ -37,6 +37,7 @@ import org.springframework.scheduling.concurrent.CustomizableThreadFactory
 import reactor.core.publisher.Flux
 import reactor.core.publisher.Mono
 import reactor.core.scheduler.Schedulers
+import reactor.kotlin.extra.retry.retryRandomBackoff
 import reactor.util.function.Tuple2
 import java.time.Duration
 import java.util.concurrent.Executors
@@ -93,6 +94,7 @@ open class EthereumUpstreamValidator @JvmOverloads constructor(
                     UpstreamAvailability.OK
                 }
             }
+            .doOnError { err -> log.error("Error during syncing validation for ${upstream.getId()}", err) }
             .onErrorReturn(UpstreamAvailability.UNAVAILABLE)
     }
 
@@ -118,6 +120,7 @@ open class EthereumUpstreamValidator @JvmOverloads constructor(
                     UpstreamAvailability.OK
                 }
             }
+            .doOnError { err -> log.error("Error during peer count validation for ${upstream.getId()}", err) }
             .onErrorReturn(UpstreamAvailability.UNAVAILABLE)
     }
 
@@ -203,13 +206,25 @@ open class EthereumUpstreamValidator @JvmOverloads constructor(
                 Mono.fromCallable { log.error("No response for eth_call limit check from ${upstream.getId()}") }
                     .then(Mono.error(TimeoutException("Validation timeout for call limit")))
             )
+            .retryRandomBackoff(3, Duration.ofMillis(100), Duration.ofMillis(500)) { ctx ->
+                log.warn(
+                    "error during validateCallLimit for ${upstream.getId()}, iteration ${ctx.iteration()}",
+                    ctx.exception()
+                )
+            }
             .onErrorReturn(false)
     }
 
     private fun chainId(): Mono<String> {
         return upstream.getIngressReader()
             .read(JsonRpcRequest("eth_chainId", emptyList()))
-            .doOnError { log.error("Error during execution 'eth_chainId' - ${it.message}") }
+            .retryRandomBackoff(3, Duration.ofMillis(100), Duration.ofMillis(500)) { ctx ->
+                log.warn(
+                    "error during chainId retrieving for ${upstream.getId()}, iteration ${ctx.iteration()}",
+                    ctx.exception()
+                )
+            }
+            .doOnError { log.error("Error during execution 'eth_chainId' - ${it.message} for ${upstream.getId()}") }
             .flatMap(JsonRpcResponse::requireResult)
             .map { String(it) }
     }
@@ -217,7 +232,13 @@ open class EthereumUpstreamValidator @JvmOverloads constructor(
     private fun netVersion(): Mono<String> {
         return upstream.getIngressReader()
             .read(JsonRpcRequest("net_version", emptyList()))
-            .doOnError { log.error("Error during execution 'net_version' - ${it.message}") }
+            .retryRandomBackoff(3, Duration.ofMillis(100), Duration.ofMillis(500)) { ctx ->
+                log.warn(
+                    "error during netVersion retrieving for ${upstream.getId()}, iteration ${ctx.iteration()}",
+                    ctx.exception()
+                )
+            }
+            .doOnError { log.error("Error during execution 'net_version' - ${it.message} for ${upstream.getId()}") }
             .flatMap(JsonRpcResponse::requireResult)
             .map { String(it) }
     }
diff --git a/src/main/resources/chains.yaml b/src/main/resources/chains.yaml
index 6b7fab26..fd2dcacc 100644
--- a/src/main/resources/chains.yaml
+++ b/src/main/resources/chains.yaml
@@ -90,3 +90,41 @@ chain-settings:
       lags:
         syncing: 40
         lagging: 20
+    - id: avalanche
+      options:
+        validate-peers: false
+        validate-syncing: false
+      lags:
+        syncing: 10
+        lagging: 5
+    - id: avalanche-fuji
+      options:
+        validate-peers: false
+        validate-syncing: false
+      lags:
+        syncing: 10
+        lagging: 5
+    - id: gnosis
+      options:
+        validate-peers: false
+      lags:
+        syncing: 10
+        lagging: 5
+    - id: gnosis-chiado
+      options:
+        validate-peers: false
+      lags:
+        syncing: 10
+        lagging: 5
+    - id: fantom
+      options:
+        validate-peers: false
+      lags:
+        syncing: 10
+        lagging: 5
+    - id: fantom-testnet
+      options:
+        validate-peers: false
+      lags:
+        syncing: 10
+        lagging: 5