diff --git a/cmd/thalos/server.go b/cmd/thalos/server.go
index 2aed773..0fa0c4a 100644
--- a/cmd/thalos/server.go
+++ b/cmd/thalos/server.go
@@ -238,6 +238,8 @@ func GetConfig(flags *pflag.FlagSet) (*config.Config, error) {
 		}
 	}
 
+	cfg.Ship.Blacklist.SetWhitelist(cfg.Ship.BlacklistIsWhitelist)
+
 	return cfg, nil
 }
 
diff --git a/config.example.yml b/config.example.yml
index 84990b1..9d6deef 100644
--- a/config.example.yml
+++ b/config.example.yml
@@ -54,6 +54,8 @@ ship:
     # blacklist all action from a contract
     # evilcontract: ["*"]
 
+  # blacklist_is_whitelist: true
+
 # Telegram notifications
 #telegram:
 #  id: "123456789:GPdmGPBWvpgHPxlergJLavus-PoAURTjMWP"
diff --git a/internal/config/builder.go b/internal/config/builder.go
index d273858..2967f63 100644
--- a/internal/config/builder.go
+++ b/internal/config/builder.go
@@ -53,6 +53,7 @@ func NewBuilder() *Builder {
 			"ship.max_messages_in_flight": "max-msg-in-flight",
 			"ship.chain":                  "chain",
 			"ship.blacklist":              "blacklist",
+			"ship.blacklist_is_whitelist": "blacklist-is-whitelist",
 		},
 	}
 }
diff --git a/internal/config/builder_test.go b/internal/config/builder_test.go
index bec8178..df24552 100644
--- a/internal/config/builder_test.go
+++ b/internal/config/builder_test.go
@@ -32,6 +32,7 @@ func TestBuilder(t *testing.T) {
 				"eosio":    {"noop"},
 				"contract": {"skip1", "skip2"},
 			}),
+			BlacklistIsWhitelist: true,
 		},
 		Telegram: TelegramConfig{
 			Id:      "110201543:AAHdqTcvCH1vGWJxfSeofSAs0K5PALDsaw",
@@ -68,6 +69,7 @@ ship:
     contract:
       - skip1
       - skip2
+  blacklist_is_whitelist: true
 telegram:
   id: "110201543:AAHdqTcvCH1vGWJxfSeofSAs0K5PALDsaw"
   channel: -123456789
@@ -186,6 +188,7 @@ func TestBuilder_Flags(t *testing.T) {
 	require.NoError(t, flags.Set("max-msg-in-flight", "98"))
 	require.NoError(t, flags.Set("chain", "wax"))
 	require.NoError(t, flags.Set("blacklist", "contract:action1,contract:action2,contract2:action1"))
+	require.NoError(t, flags.Set("blacklist-is-whitelist", "true"))
 
 	cfg, err := NewBuilder().
 		SetSource(bytes.NewReader([]byte(``))).
@@ -211,6 +214,7 @@ func TestBuilder_Flags(t *testing.T) {
 				"contract":  {"action1", "action2"},
 				"contract2": {"action1"},
 			}),
+			BlacklistIsWhitelist: true,
 		},
 		Telegram: TelegramConfig{
 			Id:      "72983126312982618",
diff --git a/internal/config/cli.go b/internal/config/cli.go
index 38439a5..85d8f39 100644
--- a/internal/config/cli.go
+++ b/internal/config/cli.go
@@ -44,6 +44,7 @@ func GetFlags() *pflag.FlagSet {
 	flags.String("chain", "", "ChainID used in channel namespace, can be any string (default from api)")
 
 	flags.StringSlice("blacklist", []string{}, "Define a list of 'contract:action' pairs that will be blacklisted (thalos will not process those actions)")
+	flags.Bool("blacklist-is-whitelist", false, "Thalos will treat the blacklist as a whitelist")
 
 	return &flags
 }
diff --git a/internal/config/config.go b/internal/config/config.go
index 5e84072..7bb8b4b 100644
--- a/internal/config/config.go
+++ b/internal/config/config.go
@@ -19,13 +19,14 @@ type TelegramConfig struct {
 }
 
 type ShipConfig struct {
-	Url                 string          `yaml:"url" mapstructure:"url"`
-	IrreversibleOnly    bool            `yaml:"irreversible_only" mapstructure:"irreversible_only"`
-	MaxMessagesInFlight uint32          `yaml:"max_messages_in_flight" mapstructure:"max_messages_in_flight"`
-	StartBlockNum       uint32          `yaml:"start_block_num" mapstructure:"start_block_num"`
-	EndBlockNum         uint32          `yaml:"end_block_num" mapstructure:"end_block_num"`
-	Chain               string          `yaml:"chain" mapstructure:"chain"`
-	Blacklist           types.Blacklist `yaml:"blacklist" mapstructure:"blacklist"`
+	Url                  string          `yaml:"url" mapstructure:"url"`
+	IrreversibleOnly     bool            `yaml:"irreversible_only" mapstructure:"irreversible_only"`
+	MaxMessagesInFlight  uint32          `yaml:"max_messages_in_flight" mapstructure:"max_messages_in_flight"`
+	StartBlockNum        uint32          `yaml:"start_block_num" mapstructure:"start_block_num"`
+	EndBlockNum          uint32          `yaml:"end_block_num" mapstructure:"end_block_num"`
+	Chain                string          `yaml:"chain" mapstructure:"chain"`
+	Blacklist            types.Blacklist `yaml:"blacklist" mapstructure:"blacklist"`
+	BlacklistIsWhitelist bool            `yaml:"blacklist_is_whitelist" mapstructure:"blacklist_is_whitelist"`
 }
 
 type Config struct {