diff --git a/apps/block_scout_web/config/runtime/test.exs b/apps/block_scout_web/config/runtime/test.exs
index d7100466c1..f465b51062 100644
--- a/apps/block_scout_web/config/runtime/test.exs
+++ b/apps/block_scout_web/config/runtime/test.exs
@@ -1,5 +1,7 @@
 import Config
 
+alias EthereumJSONRPC.Variant
+
 config :explorer, Explorer.ExchangeRates, enabled: false, store: :none
 
 config :explorer, Explorer.KnownTokens, enabled: false, store: :none
@@ -13,15 +15,7 @@ config :ueberauth, Ueberauth,
   logout_url: "example.com/logout",
   logout_return_to_url: "example.com/return"
 
-variant =
-  if is_nil(System.get_env("ETHEREUM_JSONRPC_VARIANT")) do
-    "parity"
-  else
-    System.get_env("ETHEREUM_JSONRPC_VARIANT")
-    |> String.split(".")
-    |> List.last()
-    |> String.downcase()
-  end
+variant = Variant.get()
 
 Code.require_file("#{variant}.exs", "#{__DIR__}/../../../explorer/config/test")
 Code.require_file("#{variant}.exs", "#{__DIR__}/../../../indexer/config/test")
diff --git a/apps/ethereum_jsonrpc/config/runtime/test.exs b/apps/ethereum_jsonrpc/config/runtime/test.exs
index 476dedd943..e2043f6c14 100644
--- a/apps/ethereum_jsonrpc/config/runtime/test.exs
+++ b/apps/ethereum_jsonrpc/config/runtime/test.exs
@@ -1,14 +1,8 @@
 import Config
 
-variant =
-  if is_nil(System.get_env("ETHEREUM_JSONRPC_VARIANT")) do
-    "parity"
-  else
-    System.get_env("ETHEREUM_JSONRPC_VARIANT")
-    |> String.split(".")
-    |> List.last()
-    |> String.downcase()
-  end
+alias EthereumJSONRPC.Variant
+
+variant = Variant.get()
 
 Code.require_file("#{variant}.exs", "#{__DIR__}/../../../explorer/config/test")
 Code.require_file("#{variant}.exs", "#{__DIR__}/../../../indexer/config/test")
diff --git a/apps/ethereum_jsonrpc/lib/ethereum_jsonrpc/variant.ex b/apps/ethereum_jsonrpc/lib/ethereum_jsonrpc/variant.ex
index 0374165477..7c213676b8 100644
--- a/apps/ethereum_jsonrpc/lib/ethereum_jsonrpc/variant.ex
+++ b/apps/ethereum_jsonrpc/lib/ethereum_jsonrpc/variant.ex
@@ -94,4 +94,15 @@ defmodule EthereumJSONRPC.Variant do
               ],
               EthereumJSONRPC.json_rpc_named_arguments()
             ) :: {:ok, [raw_trace_params]} | {:error, reason :: term} | :ignore
+
+  def get do
+    if is_nil(System.get_env("ETHEREUM_JSONRPC_VARIANT")) do
+      "nethermind"
+    else
+      System.get_env("ETHEREUM_JSONRPC_VARIANT")
+      |> String.split(".")
+      |> List.last()
+      |> String.downcase()
+    end
+  end
 end
diff --git a/apps/explorer/config/runtime/test.exs b/apps/explorer/config/runtime/test.exs
index ab71c6033f..a47fbb6180 100644
--- a/apps/explorer/config/runtime/test.exs
+++ b/apps/explorer/config/runtime/test.exs
@@ -1,5 +1,7 @@
 import Config
 
+alias EthereumJSONRPC.Variant
+
 config :explorer, Explorer.ExchangeRates, enabled: false, store: :ets, fetch_btc_value: true
 
 config :explorer, Explorer.Chain.Cache.BlockNumber, enabled: false
@@ -24,15 +26,7 @@ config :explorer, Explorer.Tracer, disabled?: false
 config :explorer,
   realtime_events_sender: Explorer.Chain.Events.SimpleSender
 
-variant =
-  if is_nil(System.get_env("ETHEREUM_JSONRPC_VARIANT")) do
-    "parity"
-  else
-    System.get_env("ETHEREUM_JSONRPC_VARIANT")
-    |> String.split(".")
-    |> List.last()
-    |> String.downcase()
-  end
+variant = Variant.get()
 
 Code.require_file("#{variant}.exs", "#{__DIR__}/../../../explorer/config/test")
 Code.require_file("#{variant}.exs", "#{__DIR__}/../../../indexer/config/test")
diff --git a/apps/explorer/lib/explorer/repo/config_helper.ex b/apps/explorer/lib/explorer/repo/config_helper.ex
index 3f60a1b199..d02447f64a 100644
--- a/apps/explorer/lib/explorer/repo/config_helper.ex
+++ b/apps/explorer/lib/explorer/repo/config_helper.ex
@@ -25,6 +25,19 @@ defmodule Explorer.Repo.ConfigHelper do
     |> Keyword.merge(extract_parameters(url))
   end
 
+  def get_db_pool_size(default_pool_size), do: String.to_integer(System.get_env("POOL_SIZE", default_pool_size))
+
+  def get_account_db_url, do: System.get_env("ACCOUNT_DATABASE_URL") || System.get_env("DATABASE_URL")
+
+  def get_account_db_pool_size(default_pool_size),
+    do: String.to_integer(System.get_env("ACCOUNT_POOL_SIZE", default_pool_size))
+
+  def get_api_db_url, do: System.get_env("DATABASE_READ_ONLY_API_URL") || System.get_env("DATABASE_URL")
+
+  def get_api_db_pool_size(default_pool_size), do: String.to_integer(System.get_env("POOL_SIZE_API", default_pool_size))
+
+  def ssl_enabled?, do: String.equivalent?(System.get_env("ECTO_USE_SSL") || "true", "true")
+
   defp extract_parameters(empty) when empty == nil or empty == "", do: []
 
   # sobelow_skip ["DOS.StringToAtom"]
diff --git a/apps/indexer/config/runtime/test.exs b/apps/indexer/config/runtime/test.exs
index 476dedd943..e2043f6c14 100644
--- a/apps/indexer/config/runtime/test.exs
+++ b/apps/indexer/config/runtime/test.exs
@@ -1,14 +1,8 @@
 import Config
 
-variant =
-  if is_nil(System.get_env("ETHEREUM_JSONRPC_VARIANT")) do
-    "parity"
-  else
-    System.get_env("ETHEREUM_JSONRPC_VARIANT")
-    |> String.split(".")
-    |> List.last()
-    |> String.downcase()
-  end
+alias EthereumJSONRPC.Variant
+
+variant = Variant.get()
 
 Code.require_file("#{variant}.exs", "#{__DIR__}/../../../explorer/config/test")
 Code.require_file("#{variant}.exs", "#{__DIR__}/../../../indexer/config/test")
diff --git a/config/runtime/dev.exs b/config/runtime/dev.exs
index 8de612decb..22163b07cf 100644
--- a/config/runtime/dev.exs
+++ b/config/runtime/dev.exs
@@ -1,5 +1,8 @@
 import Config
 
+alias EthereumJSONRPC.Variant
+alias Explorer.Repo.ConfigHelper
+
 ######################
 ### BlockScout Web ###
 ######################
@@ -41,15 +44,10 @@ config :block_scout_web, BlockScoutWeb.Endpoint,
 database = if System.get_env("DATABASE_URL"), do: nil, else: "explorer_dev"
 hostname = if System.get_env("DATABASE_URL"), do: nil, else: "localhost"
 
-database_api_url =
-  if System.get_env("DATABASE_READ_ONLY_API_URL"),
-    do: System.get_env("DATABASE_READ_ONLY_API_URL"),
-    else: System.get_env("DATABASE_URL")
-
 pool_size =
   if System.get_env("DATABASE_READ_ONLY_API_URL"),
-    do: String.to_integer(System.get_env("POOL_SIZE", "30")),
-    else: String.to_integer(System.get_env("POOL_SIZE", "40"))
+    do: ConfigHelper.get_db_pool_size("30"),
+    else: ConfigHelper.get_db_pool_size("40")
 
 # Configure your database
 config :explorer, Explorer.Repo,
@@ -61,18 +59,12 @@ config :explorer, Explorer.Repo,
 database_api = if System.get_env("DATABASE_READ_ONLY_API_URL"), do: nil, else: database
 hostname_api = if System.get_env("DATABASE_READ_ONLY_API_URL"), do: nil, else: hostname
 
-pool_size_api = String.to_integer(System.get_env("POOL_SIZE_API", "10"))
-
 # Configure API database
 config :explorer, Explorer.Repo.Replica1,
   database: database_api,
   hostname: hostname_api,
-  url: database_api_url,
-  pool_size: pool_size_api
-
-database_account_url = System.get_env("ACCOUNT_DATABASE_URL") || System.get_env("DATABASE_URL")
-
-pool_size_account = String.to_integer(System.get_env("ACCOUNT_POOL_SIZE", "10"))
+  url: ConfigHelper.get_api_db_url(),
+  pool_size: ConfigHelper.get_api_db_pool_size("10")
 
 database_account = if System.get_env("ACCOUNT_DATABASE_URL"), do: nil, else: database
 hostname_account = if System.get_env("ACCOUNT_DATABASE_URL"), do: nil, else: hostname
@@ -81,18 +73,10 @@ hostname_account = if System.get_env("ACCOUNT_DATABASE_URL"), do: nil, else: hos
 config :explorer, Explorer.Repo.Account,
   database: database_account,
   hostname: hostname_account,
-  url: database_account_url,
-  pool_size: pool_size_account
-
-variant =
-  if is_nil(System.get_env("ETHEREUM_JSONRPC_VARIANT")) do
-    "ganache"
-  else
-    System.get_env("ETHEREUM_JSONRPC_VARIANT")
-    |> String.split(".")
-    |> List.last()
-    |> String.downcase()
-  end
+  url: ConfigHelper.get_account_db_url(),
+  pool_size: ConfigHelper.get_account_db_pool_size("10")
+
+variant = Variant.get()
 
 Code.require_file("#{variant}.exs", "apps/explorer/config/dev")
 
diff --git a/config/runtime/prod.exs b/config/runtime/prod.exs
index 0e4e58f81a..b5bdf68b66 100644
--- a/config/runtime/prod.exs
+++ b/config/runtime/prod.exs
@@ -1,5 +1,8 @@
 import Config
 
+alias EthereumJSONRPC.Variant
+alias Explorer.Repo.ConfigHelper
+
 ######################
 ### BlockScout Web ###
 ######################
@@ -24,53 +27,33 @@ config :block_scout_web, BlockScoutWeb.Endpoint,
 
 pool_size =
   if System.get_env("DATABASE_READ_ONLY_API_URL"),
-    do: String.to_integer(System.get_env("POOL_SIZE", "50")),
-    else: String.to_integer(System.get_env("POOL_SIZE", "40"))
+    do: ConfigHelper.get_db_pool_size("50"),
+    else: ConfigHelper.get_db_pool_size("40")
 
 # Configures the database
 config :explorer, Explorer.Repo,
   url: System.get_env("DATABASE_URL"),
   pool_size: pool_size,
-  ssl: String.equivalent?(System.get_env("ECTO_USE_SSL") || "true", "true")
-
-database_api_url =
-  if System.get_env("DATABASE_READ_ONLY_API_URL"),
-    do: System.get_env("DATABASE_READ_ONLY_API_URL"),
-    else: System.get_env("DATABASE_URL")
+  ssl: ConfigHelper.ssl_enabled?()
 
 pool_size_api =
   if System.get_env("DATABASE_READ_ONLY_API_URL"),
-    do: String.to_integer(System.get_env("POOL_SIZE_API", "50")),
-    else: String.to_integer(System.get_env("POOL_SIZE_API", "10"))
+    do: ConfigHelper.get_api_db_pool_size("50"),
+    else: ConfigHelper.get_api_db_pool_size("10")
 
 # Configures API the database
 config :explorer, Explorer.Repo.Replica1,
-  url: database_api_url,
+  url: ConfigHelper.get_api_db_url(),
   pool_size: pool_size_api,
-  ssl: String.equivalent?(System.get_env("ECTO_USE_SSL") || "true", "true")
-
-database_account_url =
-  if System.get_env("ACCOUNT_DATABASE_URL"),
-    do: System.get_env("ACCOUNT_DATABASE_URL"),
-    else: System.get_env("DATABASE_URL")
-
-pool_size_account = String.to_integer(System.get_env("ACCOUNT_POOL_SIZE", "50"))
+  ssl: ConfigHelper.ssl_enabled?()
 
 # Configures Account database
 config :explorer, Explorer.Repo.Account,
-  url: database_account_url,
-  pool_size: pool_size_account,
-  ssl: String.equivalent?(System.get_env("ECTO_USE_SSL") || "true", "true")
+  url: ConfigHelper.get_account_db_url(),
+  pool_size: ConfigHelper.get_account_db_pool_size("50"),
+  ssl: ConfigHelper.ssl_enabled?()
 
-variant =
-  if is_nil(System.get_env("ETHEREUM_JSONRPC_VARIANT")) do
-    "parity"
-  else
-    System.get_env("ETHEREUM_JSONRPC_VARIANT")
-    |> String.split(".")
-    |> List.last()
-    |> String.downcase()
-  end
+variant = Variant.get()
 
 Code.require_file("#{variant}.exs", "apps/explorer/config/prod")
 
diff --git a/config/runtime/test.exs b/config/runtime/test.exs
index 38cd15e0df..f6ba58d424 100644
--- a/config/runtime/test.exs
+++ b/config/runtime/test.exs
@@ -1,5 +1,7 @@
 import Config
 
+alias EthereumJSONRPC.Variant
+
 ######################
 ### BlockScout Web ###
 ######################
@@ -12,15 +14,7 @@ import Config
 ### Explorer ###
 ################
 
-variant =
-  if is_nil(System.get_env("ETHEREUM_JSONRPC_VARIANT")) do
-    "parity"
-  else
-    System.get_env("ETHEREUM_JSONRPC_VARIANT")
-    |> String.split(".")
-    |> List.last()
-    |> String.downcase()
-  end
+variant = Variant.get()
 
 Code.require_file("#{variant}.exs", "apps/explorer/config/test")
 
diff --git a/docker-compose/README.md b/docker-compose/README.md
index 001ff7fead..67c1496a60 100644
--- a/docker-compose/README.md
+++ b/docker-compose/README.md
@@ -32,7 +32,7 @@ Also, the repo contains built-in configs for different clients without need to b
 
 - Erigon: `docker-compose -f docker-compose-no-build-erigon.yml up -d`
 - Geth: `docker-compose -f docker-compose-no-build-geth.yml up -d`
-- Nethermind, OpenEthereum: `docker-compose -f docker-compose-no-build-open-ethereum-nethermind up -d`
+- Nethermind, OpenEthereum: `docker-compose -f docker-compose-no-build-nethermind up -d`
 - Ganache: `docker-compose -f docker-compose-no-build-ganache.yml up -d`
 - HardHat network: `docker-compose -f docker-compose-no-build-hardhat-network.yml up -d`
 - Running only explorer without DB: `docker-compose -f docker-compose-no-build-no-db-container.yml up -d`. In this case, one container is created - for the explorer itself. And it assumes that the DB credentials are provided through `DATABASE_URL` environment variable.
diff --git a/docker-compose/docker-compose-no-build-open-ethereum-nethermind.yml b/docker-compose/docker-compose-no-build-nethermind.yml
similarity index 100%
rename from docker-compose/docker-compose-no-build-open-ethereum-nethermind.yml
rename to docker-compose/docker-compose-no-build-nethermind.yml