diff --git a/core/chains/evm/config/toml/defaults/Metis_Mainnet.toml b/core/chains/evm/config/toml/defaults/Metis_Mainnet.toml
index f057400d01..388b9f00b0 100644
--- a/core/chains/evm/config/toml/defaults/Metis_Mainnet.toml
+++ b/core/chains/evm/config/toml/defaults/Metis_Mainnet.toml
@@ -1,6 +1,6 @@
 # Metis is an L2 chain based on Optimism.
 ChainID = '1088'
-ChainType = 'metis'
+ChainType = 'optimismBedrock'
 # Sequencer offers absolute finality
 FinalityDepth = 10
 FinalityTagEnabled = true
diff --git a/core/services/ocr2/plugins/ccip/estimatorconfig/config.go b/core/services/ocr2/plugins/ccip/estimatorconfig/config.go
index 0e66f4fb39..4737bd33e8 100644
--- a/core/services/ocr2/plugins/ccip/estimatorconfig/config.go
+++ b/core/services/ocr2/plugins/ccip/estimatorconfig/config.go
@@ -2,7 +2,6 @@ package estimatorconfig
 
 import (
 	"context"
-	"errors"
 	"math/big"
 
 	"github.com/smartcontractkit/chainlink-common/pkg/types/ccip"
@@ -42,7 +41,7 @@ func (c *FeeEstimatorConfigService) SetOnRampReader(reader ccip.OnRampReader) {
 // GetDynamicConfig should be cached in the onRamp reader to avoid unnecessary on-chain calls
 func (c *FeeEstimatorConfigService) GetDataAvailabilityConfig(ctx context.Context) (destDataAvailabilityOverheadGas, destGasPerDataAvailabilityByte, destDataAvailabilityMultiplierBps int64, err error) {
 	if c.onRampReader == nil {
-		return 0, 0, 0, errors.New("no OnRampReader has been configured")
+		return 0, 0, 0, nil
 	}
 
 	cfg, err := c.onRampReader.GetDynamicConfig(ctx)
diff --git a/core/services/ocr2/plugins/ccip/estimatorconfig/config_test.go b/core/services/ocr2/plugins/ccip/estimatorconfig/config_test.go
index 0ed7510591..3ecd88ae3b 100644
--- a/core/services/ocr2/plugins/ccip/estimatorconfig/config_test.go
+++ b/core/services/ocr2/plugins/ccip/estimatorconfig/config_test.go
@@ -24,8 +24,11 @@ func TestFeeEstimatorConfigService(t *testing.T) {
 	var expectedDestDataAvailabilityMultiplierBps int64 = 3
 
 	onRampReader := mocks.NewOnRampReader(t)
-	_, _, _, err := svc.GetDataAvailabilityConfig(ctx)
-	require.Error(t, err)
+	destDataAvailabilityOverheadGas, destGasPerDataAvailabilityByte, destDataAvailabilityMultiplierBps, err := svc.GetDataAvailabilityConfig(ctx)
+	require.NoError(t, err) // if onRampReader not set, return nil error and 0 values
+	require.EqualValues(t, 0, destDataAvailabilityOverheadGas)
+	require.EqualValues(t, 0, destGasPerDataAvailabilityByte)
+	require.EqualValues(t, 0, destDataAvailabilityMultiplierBps)
 	svc.SetOnRampReader(onRampReader)
 
 	onRampReader.On("GetDynamicConfig", ctx).
@@ -35,7 +38,7 @@ func TestFeeEstimatorConfigService(t *testing.T) {
 			DestDataAvailabilityMultiplierBps: uint16(expectedDestDataAvailabilityMultiplierBps),
 		}, nil).Once()
 
-	destDataAvailabilityOverheadGas, destGasPerDataAvailabilityByte, destDataAvailabilityMultiplierBps, err := svc.GetDataAvailabilityConfig(ctx)
+	destDataAvailabilityOverheadGas, destGasPerDataAvailabilityByte, destDataAvailabilityMultiplierBps, err = svc.GetDataAvailabilityConfig(ctx)
 	require.NoError(t, err)
 	require.Equal(t, expectedDestDataAvailabilityOverheadGas, destDataAvailabilityOverheadGas)
 	require.Equal(t, expectedDestGasPerDataAvailabilityByte, destGasPerDataAvailabilityByte)
diff --git a/docs/CONFIG.md b/docs/CONFIG.md
index 10e2519049..196da084ab 100644
--- a/docs/CONFIG.md
+++ b/docs/CONFIG.md
@@ -4523,7 +4523,7 @@ GasLimit = 5400000
 AutoCreateKey = true
 BlockBackfillDepth = 10
 BlockBackfillSkip = false
-ChainType = 'metis'
+ChainType = 'optimismBedrock'
 FinalityDepth = 10
 FinalityTagEnabled = true
 LogBackfillBatchSize = 1000