diff --git a/.golangci.yml b/.golangci.yml
index 4362ba9..abdd6e5 100644
--- a/.golangci.yml
+++ b/.golangci.yml
@@ -21,9 +21,6 @@ linters-settings:
       - standard
       - default
       - prefix(github.com/poanetwork/tokenbridge-monitor)
-  gocritic:
-    disabled-checks:
-      - ifElseChain
   funlen:
     lines: 130
     statements: 60
diff --git a/cmd/fix_block_timestamps/main.go b/cmd/fix_block_timestamps/main.go
index 7042989..35cbb1d 100644
--- a/cmd/fix_block_timestamps/main.go
+++ b/cmd/fix_block_timestamps/main.go
@@ -18,7 +18,7 @@ import (
 func main() {
 	logger := logging.New()
 
-	cfg, err := config.ReadConfig()
+	cfg, err := config.ReadConfigFromFile("config.yml")
 	if err != nil {
 		logger.WithError(err).Fatal("can't read config")
 	}
diff --git a/cmd/monitor/main.go b/cmd/monitor/main.go
index 5f3ad7e..5ca5620 100644
--- a/cmd/monitor/main.go
+++ b/cmd/monitor/main.go
@@ -20,7 +20,7 @@ import (
 func main() {
 	logger := logging.New()
 
-	cfg, err := config.ReadConfig()
+	cfg, err := config.ReadConfigFromFile("config.yml")
 	if err != nil {
 		logger.WithError(err).Fatal("can't read config")
 	}
diff --git a/cmd/reprocess_block_range/main.go b/cmd/reprocess_block_range/main.go
index 1fefae8..c6d4c13 100644
--- a/cmd/reprocess_block_range/main.go
+++ b/cmd/reprocess_block_range/main.go
@@ -29,7 +29,7 @@ func main() {
 
 	logger := logging.New()
 
-	cfg, err := config.ReadConfig()
+	cfg, err := config.ReadConfigFromFile("config.yml")
 	if err != nil {
 		logger.WithError(err).Fatal("can't read config")
 	}
diff --git a/config/config.go b/config/config.go
index c6b96a6..aa3171d 100644
--- a/config/config.go
+++ b/config/config.go
@@ -94,18 +94,11 @@ type Config struct {
 	Presenter       *PresenterConfig         `yaml:"presenter"`
 }
 
-func readYamlConfig(cfg *Config) error {
-	blob, err := os.ReadFile("config.yml")
-	if err != nil {
-		return fmt.Errorf("can't access config file: %w", err)
-	}
-	blob = []byte(os.ExpandEnv(string(blob)))
-
+func parseYaml(out *Config, blob []byte) error {
 	dec := yaml.NewDecoder(bytes.NewReader(blob))
 	dec.KnownFields(true)
-	err = dec.Decode(cfg)
-	if err != nil {
-		return fmt.Errorf("can't parse yaml config: %w", err)
+	if err := dec.Decode(out); err != nil {
+		return fmt.Errorf("can't parse yaml: %w", err)
 	}
 	return nil
 }
@@ -113,31 +106,55 @@ func readYamlConfig(cfg *Config) error {
 func (cfg *Config) init() error {
 	for bridgeID, bridge := range cfg.Bridges {
 		bridge.ID = bridgeID
-		err := bridge.Home.init(cfg)
+		err := bridge.init(cfg)
 		if err != nil {
-			return fmt.Errorf("can't init home bridge config for %s: %w", bridgeID, err)
-		}
-		err = bridge.Foreign.init(cfg)
-		if err != nil {
-			return fmt.Errorf("can't init foreign bridge config for %s: %w", bridgeID, err)
-		}
-		if len(bridge.Home.ErcToNativeTokens) > 0 {
-			return fmt.Errorf("%s home config error: %w", bridgeID, ErrNonEmptyTokenList)
-		}
-		if bridge.BridgeMode == BridgeModeErcToNative {
-			if len(bridge.Foreign.ErcToNativeTokens) == 0 {
-				return fmt.Errorf("%s foreign config error: %w", bridgeID, ErrEmptyTokenList)
-			}
-		} else {
-			if len(bridge.Foreign.ErcToNativeTokens) > 0 {
-				return fmt.Errorf("%s foreign config error: %w", bridgeID, ErrNonEmptyTokenList)
-			}
-			bridge.BridgeMode = BridgeModeArbitraryMessage
+			return fmt.Errorf("can't init bridge config for %s: %w", bridgeID, err)
 		}
 	}
 	return nil
 }
 
+func (cfg *BridgeConfig) init(parent *Config) error {
+	err := cfg.Home.init(parent)
+	if err != nil {
+		return fmt.Errorf("can't init home bridge config: %w", err)
+	}
+	err = cfg.Foreign.init(parent)
+	if err != nil {
+		return fmt.Errorf("can't init foreign bridge config: %w", err)
+	}
+	if len(cfg.Home.ErcToNativeTokens) > 0 {
+		return fmt.Errorf("home config error: %w", ErrNonEmptyTokenList)
+	}
+	if cfg.BridgeMode == BridgeModeErcToNative {
+		if len(cfg.Foreign.ErcToNativeTokens) == 0 {
+			return fmt.Errorf("foreign config error: %w", ErrEmptyTokenList)
+		}
+	} else {
+		if len(cfg.Foreign.ErcToNativeTokens) > 0 {
+			return fmt.Errorf("foreign config error: %w", ErrNonEmptyTokenList)
+		}
+		cfg.BridgeMode = BridgeModeArbitraryMessage
+	}
+	for alertName, alertCfg := range cfg.Alerts {
+		if alertCfg == nil {
+			alertCfg = &BridgeAlertConfig{}
+			cfg.Alerts[alertName] = alertCfg
+		}
+		alertCfg.init(cfg)
+	}
+	return nil
+}
+
+func (cfg *BridgeAlertConfig) init(parent *BridgeConfig) {
+	if cfg.HomeStartBlock < parent.Home.StartBlock {
+		cfg.HomeStartBlock = parent.Home.StartBlock
+	}
+	if cfg.ForeignStartBlock < parent.Foreign.StartBlock {
+		cfg.ForeignStartBlock = parent.Foreign.StartBlock
+	}
+}
+
 func (cfg *BridgeSideConfig) init(parent *Config) error {
 	if cfg.MaxBlockRangeSize <= 0 {
 		cfg.MaxBlockRangeSize = 1000
@@ -174,9 +191,9 @@ func (cfg *BridgeSideConfig) ErcToNativeTokenAddresses(fromBlock, toBlock uint)
 	return addresses
 }
 
-func ReadConfig() (*Config, error) {
+func ReadConfig(blob []byte) (*Config, error) {
 	cfg := new(Config)
-	err := readYamlConfig(cfg)
+	err := parseYaml(cfg, blob)
 	if err != nil {
 		return nil, err
 	}
@@ -186,3 +203,15 @@ func ReadConfig() (*Config, error) {
 	}
 	return cfg, nil
 }
+
+func ReadConfigWithEnv(blob []byte) (*Config, error) {
+	return ReadConfig([]byte(os.ExpandEnv(string(blob))))
+}
+
+func ReadConfigFromFile(path string) (*Config, error) {
+	blob, err := os.ReadFile(path)
+	if err != nil {
+		return nil, fmt.Errorf("can't read from file: %w", err)
+	}
+	return ReadConfigWithEnv(blob)
+}
diff --git a/config/config_test.go b/config/config_test.go
new file mode 100644
index 0000000..12843ba
--- /dev/null
+++ b/config/config_test.go
@@ -0,0 +1,250 @@
+package config_test
+
+import (
+	"math"
+	"testing"
+	"time"
+
+	"github.com/ethereum/go-ethereum/common"
+	"github.com/sirupsen/logrus"
+	"github.com/stretchr/testify/require"
+
+	"github.com/poanetwork/tokenbridge-monitor/config"
+)
+
+const testCfg = `
+chains:
+  mainnet:
+    rpc:
+      host: https://mainnet.infura.io/v3/${INFURA_PROJECT_KEY}
+      timeout: 30s
+      rps: 10
+    chain_id: 1
+    block_time: 15s
+    block_index_interval: 60s
+  xdai:
+    rpc:
+      host: https://rpc.ankr.com/gnosis
+      timeout: 20s
+      rps: 10
+    chain_id: 100
+    block_time: 5s
+    block_index_interval: 30s
+    safe_logs_request: true
+bridges:
+  xdai:
+    bridge_mode: ERC_TO_NATIVE
+    home:
+      chain: xdai
+      address: 0x7301CFA0e1756B71869E93d4e4Dca5c7d0eb0AA6
+      validator_contract_address: 0xB289f0e6fBDFf8EEE340498a56e1787B303F1B6D
+      start_block: 756
+      required_block_confirmations: 12
+      max_block_range_size: 2000
+    foreign:
+      chain: mainnet
+      address: 0x4aa42145Aa6Ebf72e164C9bBC74fbD3788045016
+      validator_contract_address: 0xe1579dEbdD2DF16Ebdb9db8694391fa74EeA201E
+      start_block: 6478411
+      required_block_confirmations: 12
+      erc_to_native_tokens:
+        - address: 0x89d24A6b4CcB1B6fAA2625fE562bDD9a23260359
+          end_block: 9884448
+        - address: 0x6B175474E89094C44Da98b954EedeAC495271d0F
+          start_block: 8928158
+          blacklisted_senders:
+            - 0x0000000000000000000000000000000000000000
+            - 0x5d3a536E4D6DbD6114cc1Ead35777bAB948E3643
+    alerts:
+      unknown_erc_to_native_message_confirmation:
+      unknown_erc_to_native_message_execution:
+      stuck_erc_to_native_message_confirmation:
+      last_validator_activity:
+  xdai-amb:
+    bridge_mode: AMB
+    home:
+      chain: xdai
+      address: 0x75Df5AF045d91108662D8080fD1FEFAd6aA0bb59
+      start_block: 7408640
+      required_block_confirmations: 12
+      max_block_range_size: 2000
+      whitelisted_senders:
+        - 0x73cA9C4e72fF109259cf7374F038faf950949C51
+    foreign:
+      chain: mainnet
+      address: 0x4C36d2919e407f0Cc2Ee3c993ccF8ac26d9CE64e
+      start_block: 9130277
+      required_block_confirmations: 12
+    alerts:
+      unknown_message_confirmation:
+      unknown_message_execution:
+      stuck_message_confirmation:
+        foreign_start_block: 12922477
+      failed_message_execution:
+        home_start_block: 19979926
+        foreign_start_block: 13897393
+postgres:
+  user: test_user
+  password: test_password
+  host: test_host
+  port: 5432
+  database: test_db
+log_level: info
+presenter:
+  host: 0.0.0.0:3333
+`
+
+//nolint:paralleltest
+func TestReadConfigWithEnv(t *testing.T) {
+	t.Setenv("INFURA_PROJECT_KEY", "12345678")
+	cfg, err := config.ReadConfigWithEnv([]byte(testCfg))
+	require.NoError(t, err)
+	mainnetChainCfg := &config.ChainConfig{
+		RPC: &config.RPCConfig{
+			Host:    "https://mainnet.infura.io/v3/12345678",
+			Timeout: 30 * time.Second,
+			RPS:     10,
+		},
+		ChainID:            "1",
+		BlockTime:          15 * time.Second,
+		BlockIndexInterval: 60 * time.Second,
+		SafeLogsRequest:    false,
+	}
+	xdaiChainCfg := &config.ChainConfig{
+		RPC: &config.RPCConfig{
+			Host:    "https://rpc.ankr.com/gnosis",
+			Timeout: 20 * time.Second,
+			RPS:     10,
+		},
+		ChainID:            "100",
+		BlockTime:          5 * time.Second,
+		BlockIndexInterval: 30 * time.Second,
+		SafeLogsRequest:    true,
+	}
+	require.Equal(t, &config.Config{
+		Chains: map[string]*config.ChainConfig{
+			"mainnet": mainnetChainCfg,
+			"xdai":    xdaiChainCfg,
+		},
+		Bridges: map[string]*config.BridgeConfig{
+			"xdai": {
+				ID:         "xdai",
+				BridgeMode: config.BridgeModeErcToNative,
+				Home: &config.BridgeSideConfig{
+					ChainName:                "xdai",
+					Chain:                    xdaiChainCfg,
+					Address:                  common.HexToAddress("0x7301CFA0e1756B71869E93d4e4Dca5c7d0eb0AA6"),
+					ValidatorContractAddress: common.HexToAddress("0xB289f0e6fBDFf8EEE340498a56e1787B303F1B6D"),
+					StartBlock:               756,
+					BlockConfirmations:       12,
+					MaxBlockRangeSize:        2000,
+				},
+				Foreign: &config.BridgeSideConfig{
+					ChainName:                "mainnet",
+					Chain:                    mainnetChainCfg,
+					Address:                  common.HexToAddress("0x4aa42145Aa6Ebf72e164C9bBC74fbD3788045016"),
+					ValidatorContractAddress: common.HexToAddress("0xe1579dEbdD2DF16Ebdb9db8694391fa74EeA201E"),
+					StartBlock:               6478411,
+					BlockConfirmations:       12,
+					MaxBlockRangeSize:        1000,
+					ErcToNativeTokens: []config.TokenConfig{
+						{
+							Address:    common.HexToAddress("0x89d24A6b4CcB1B6fAA2625fE562bDD9a23260359"),
+							StartBlock: 6478411,
+							EndBlock:   9884448,
+						},
+						{
+							Address:    common.HexToAddress("0x6B175474E89094C44Da98b954EedeAC495271d0F"),
+							StartBlock: 8928158,
+							EndBlock:   math.MaxUint32,
+							BlacklistedSenders: []common.Address{
+								common.HexToAddress("0x0000000000000000000000000000000000000000"),
+								common.HexToAddress("0x5d3a536E4D6DbD6114cc1Ead35777bAB948E3643"),
+							},
+						},
+					},
+				},
+				Alerts: map[string]*config.BridgeAlertConfig{
+					"unknown_erc_to_native_message_confirmation": {756, 6478411},
+					"unknown_erc_to_native_message_execution":    {756, 6478411},
+					"stuck_erc_to_native_message_confirmation":   {756, 6478411},
+					"last_validator_activity":                    {756, 6478411},
+				},
+			},
+			"xdai-amb": {
+				ID:         "xdai-amb",
+				BridgeMode: config.BridgeModeArbitraryMessage,
+				Home: &config.BridgeSideConfig{
+					ChainName:          "xdai",
+					Chain:              xdaiChainCfg,
+					Address:            common.HexToAddress("0x75Df5AF045d91108662D8080fD1FEFAd6aA0bb59"),
+					StartBlock:         7408640,
+					BlockConfirmations: 12,
+					MaxBlockRangeSize:  2000,
+					WhitelistedSenders: []common.Address{
+						common.HexToAddress("0x73cA9C4e72fF109259cf7374F038faf950949C51"),
+					},
+				},
+				Foreign: &config.BridgeSideConfig{
+					ChainName:          "mainnet",
+					Chain:              mainnetChainCfg,
+					Address:            common.HexToAddress("0x4C36d2919e407f0Cc2Ee3c993ccF8ac26d9CE64e"),
+					StartBlock:         9130277,
+					BlockConfirmations: 12,
+					MaxBlockRangeSize:  1000,
+				},
+				Alerts: map[string]*config.BridgeAlertConfig{
+					"unknown_message_confirmation": {7408640, 9130277},
+					"unknown_message_execution":    {7408640, 9130277},
+					"stuck_message_confirmation":   {7408640, 12922477},
+					"failed_message_execution":     {19979926, 13897393},
+				},
+			},
+		},
+		DBConfig: &config.DBConfig{
+			User:     "test_user",
+			Password: "test_password",
+			Host:     "test_host",
+			Port:     5432,
+			DB:       "test_db",
+		},
+		LogLevel:        logrus.InfoLevel,
+		DisabledBridges: nil,
+		EnabledBridges:  nil,
+		Presenter: &config.PresenterConfig{
+			Host: "0.0.0.0:3333",
+		},
+	}, cfg)
+}
+
+func TestBridgeSideConfig_ErcToNativeTokenAddresses(t *testing.T) {
+	t.Parallel()
+	cfg, err := config.ReadConfig([]byte(testCfg))
+	require.NoError(t, err)
+	tokenAddresses := cfg.Bridges["xdai"].Foreign.ErcToNativeTokenAddresses(7000000, 11000000)
+	require.Equal(t, tokenAddresses, []common.Address{
+		common.HexToAddress("0x89d24A6b4CcB1B6fAA2625fE562bDD9a23260359"),
+		common.HexToAddress("0x6B175474E89094C44Da98b954EedeAC495271d0F"),
+	})
+	tokenAddresses = cfg.Bridges["xdai"].Foreign.ErcToNativeTokenAddresses(7000000, 8000000)
+	require.Equal(t, tokenAddresses, []common.Address{
+		common.HexToAddress("0x89d24A6b4CcB1B6fAA2625fE562bDD9a23260359"),
+	})
+	tokenAddresses = cfg.Bridges["xdai"].Foreign.ErcToNativeTokenAddresses(10000000, 11000000)
+	require.Equal(t, tokenAddresses, []common.Address{
+		common.HexToAddress("0x6B175474E89094C44Da98b954EedeAC495271d0F"),
+	})
+}
+
+func TestBridgeSideConfig_ContractAddresses(t *testing.T) {
+	t.Parallel()
+	cfg, err := config.ReadConfig([]byte(testCfg))
+	require.NoError(t, err)
+	tokenAddresses := cfg.Bridges["xdai"].Foreign.ContractAddresses(7000000, 11000000)
+	require.Equal(t, tokenAddresses, []common.Address{
+		common.HexToAddress("0x89d24A6b4CcB1B6fAA2625fE562bDD9a23260359"),
+		common.HexToAddress("0x6B175474E89094C44Da98b954EedeAC495271d0F"),
+		common.HexToAddress("0x4aa42145Aa6Ebf72e164C9bBC74fbD3788045016"),
+		common.HexToAddress("0xe1579dEbdD2DF16Ebdb9db8694391fa74EeA201E"),
+	})
+}
diff --git a/monitor/alerts/alert_manager.go b/monitor/alerts/alert_manager.go
index fc24b2c..ccafef8 100644
--- a/monitor/alerts/alert_manager.go
+++ b/monitor/alerts/alert_manager.go
@@ -119,21 +119,13 @@ func NewAlertManager(logger logging.Logger, db *db.DB, cfg *config.BridgeConfig)
 		jobs[name].Params = &AlertJobParams{
 			Bridge:                  cfg.ID,
 			HomeChainID:             cfg.Home.Chain.ChainID,
-			HomeStartBlockNumber:    cfg.Home.StartBlock,
+			HomeStartBlockNumber:    alertCfg.HomeStartBlock,
 			HomeBridgeAddress:       cfg.Home.Address,
 			HomeWhitelistedSenders:  cfg.Home.WhitelistedSenders,
 			ForeignChainID:          cfg.Foreign.Chain.ChainID,
-			ForeignStartBlockNumber: cfg.Foreign.StartBlock,
+			ForeignStartBlockNumber: alertCfg.ForeignStartBlock,
 			ForeignBridgeAddress:    cfg.Foreign.Address,
 		}
-		if alertCfg != nil {
-			if alertCfg.HomeStartBlock > 0 {
-				jobs[name].Params.HomeStartBlockNumber = alertCfg.HomeStartBlock
-			}
-			if alertCfg.ForeignStartBlock > 0 {
-				jobs[name].Params.ForeignStartBlockNumber = alertCfg.ForeignStartBlock
-			}
-		}
 	}
 
 	return &AlertManager{