diff --git a/core/chains/evm/client/errors.go b/core/chains/evm/client/errors.go
index 7a21a3841c..f92a79e203 100644
--- a/core/chains/evm/client/errors.go
+++ b/core/chains/evm/client/errors.go
@@ -263,9 +263,11 @@ var aStar = ClientErrors{
 }
 
 var mantle = ClientErrors{
-	InsufficientEth: regexp.MustCompile(`(: |^)'*insufficient funds for gas \* price \+ value`),
-	Fatal:           regexp.MustCompile(`(: |^)'*invalid sender`),
-	NonceTooLow:     regexp.MustCompile(`(: |^)'*nonce too low`),
+	InsufficientEth:                   regexp.MustCompile(`(: |^)'*insufficient funds for gas \* price \+ value`),
+	Fatal:                             regexp.MustCompile(`(: |^)'*invalid sender`),
+	NonceTooLow:                       regexp.MustCompile(`(: |^)'*nonce too low`),
+	ReplacementTransactionUnderpriced: regexp.MustCompile(`(: |^)'*replacement transaction underpriced`),
+	TransactionAlreadyInMempool:       regexp.MustCompile(`(: |^)'*already known`),
 }
 
 var hederaFatal = regexp.MustCompile(`(: |^)(execution reverted)(:|$) | ^Transaction gas limit '(\d+)' exceeds block gas limit '(\d+)' | ^Transaction gas limit provided '(\d+)' is insufficient of intrinsic gas required '(\d+)' | ^Oversized data:|status INVALID_SIGNATURE`)
diff --git a/core/chains/evm/client/errors_test.go b/core/chains/evm/client/errors_test.go
index e6d2f2d08b..c8483972c8 100644
--- a/core/chains/evm/client/errors_test.go
+++ b/core/chains/evm/client/errors_test.go
@@ -110,6 +110,7 @@ func Test_Eth_Errors(t *testing.T) {
 			{"gas price too low", false, "Arbitrum"},
 			{"client error replacement underpriced", true, "tomlConfig"},
 			{"", false, "tomlConfig"},
+			{"failed to forward tx to sequencer, please try again. Error message: 'replacement transaction underpriced'", true, "Mantle"},
 		}
 
 		for _, test := range tests {
@@ -142,6 +143,7 @@ func Test_Eth_Errors(t *testing.T) {
 			{"ErrorObject { code: ServerError(3), message: \\\"known transaction. transaction with hash 0xf016…ad63 is already in the system\\\", data: Some(RawValue(\\\"0x\\\")) }", true, "zkSync"},
 			{"client error transaction already in mempool", true, "tomlConfig"},
 			{"alreadyknown", true, "Gnosis"},
+			{"failed to forward tx to sequencer, please try again. Error message: 'already known'", true, "Mantle"},
 		}
 		for _, test := range tests {
 			err = evmclient.NewSendErrorS(test.message)
diff --git a/core/chains/evm/config/toml/defaults/Bitlayer_Mainnet.toml b/core/chains/evm/config/toml/defaults/Bitlayer_Mainnet.toml
new file mode 100644
index 0000000000..9c68d1d932
--- /dev/null
+++ b/core/chains/evm/config/toml/defaults/Bitlayer_Mainnet.toml
@@ -0,0 +1,11 @@
+ChainID = '200901'
+FinalityTagEnabled = false
+FinalityDepth = 21         # confirmed with Bitlayer team and recommended by docs: https://docs.bitlayer.org/docs/Learn/BitlayerNetwork/AboutFinality/#about-finality-at-stage-bitlayer-pos-bitlayer-mainnet-v1
+
+[GasEstimator]
+Mode = 'FeeHistory'
+EIP1559DynamicFees = false
+PriceMax = '1 gwei'        # DS&A recommended value
+PriceMin = '40 mwei'       # During testing, we saw minimum gas prices ~50 mwei
+PriceDefault = '1 gwei'    # As we set PriceMax to '1 gwei' and PriceDefault must be less than or equal to PriceMax
+FeeCapDefault = '1 gwei'   # As we set PriceMax to '1 gwei' and FeeCapDefault must be less than or equal to PriceMax
\ No newline at end of file
diff --git a/core/chains/evm/config/toml/defaults/Bitlayer_Testnet.toml b/core/chains/evm/config/toml/defaults/Bitlayer_Testnet.toml
new file mode 100644
index 0000000000..0abba07420
--- /dev/null
+++ b/core/chains/evm/config/toml/defaults/Bitlayer_Testnet.toml
@@ -0,0 +1,11 @@
+ChainID = '200810'
+FinalityTagEnabled = false
+FinalityDepth = 21 # confirmed with Bitlayer team and recommended by docs: https://docs.bitlayer.org/docs/Learn/BitlayerNetwork/AboutFinality/#about-finality-at-stage-bitlayer-pos-bitlayer-mainnet-v1
+
+[GasEstimator]
+Mode='FeeHistory'
+EIP1559DynamicFees = false
+PriceMax = '1 gwei' # DS&A recommended value
+PriceMin = '40 mwei' # During testing, we saw minimum gas prices ~50 mwei
+PriceDefault = '1 gwei' # As we set PriceMax to '1 gwei' and PriceDefault must be less than or equal to PriceMax
+FeeCapDefault = '1 gwei' # As we set PriceMax to '1 gwei' and FeeCapDefault must be less than or equal to PriceMax
\ No newline at end of file
diff --git a/core/chains/evm/config/toml/defaults/Mantle_Mainnet.toml b/core/chains/evm/config/toml/defaults/Mantle_Mainnet.toml
new file mode 100644
index 0000000000..23d5168a7e
--- /dev/null
+++ b/core/chains/evm/config/toml/defaults/Mantle_Mainnet.toml
@@ -0,0 +1,33 @@
+ChainID = '5000'
+FinalityTagEnabled = true
+FinalityDepth = 1200
+ChainType = 'optimismBedrock'
+LogPollInterval = '2s'
+MinIncomingConfirmations = 1
+NoNewFinalizedHeadsThreshold = '40m0s'
+
+[HeadTracker]
+HistoryDepth = 1250
+
+[GasEstimator]
+PriceMax = '120 gwei'
+# Limit values are high as Mantle's GasPrice is in native token (MNT) instead of ETH. Their proprietary TokenRatio parameter is used to adjust fees
+LimitDefault = 80_000_000_000
+LimitMax = 100_000_000_000
+BumpMin = '100 wei'
+BumpThreshold = 60
+EIP1559DynamicFees = true
+FeeCapDefault = '120 gwei'
+# Mantle recommends setting Priority Fee to 0 in their docs linked here: https://docs-v2.mantle.xyz/devs/concepts/tx-fee/eip-1559#application-of-eip-1559-in-mantle-v2-tectonic
+TipCapDefault = '0 wei'
+TipCapMin = '0 wei'
+
+[GasEstimator.BlockHistory]
+# Default is 24, which leads to bumpy gas prices. In CCIP
+# we want to smooth out the gas prices, so we increase the sample size.
+BlockHistorySize = 200
+# The formula for FeeCap is (current block base fee * (1.125 ^ EIP1559FeeCapBufferBlocks) + tipcap)
+# where tipcap is managed by the block history estimators. In the context of CCIP,
+# the gas price is relayed to other changes for quotes so we want accurate/avg not pessimistic values.
+# So we set this to zero so FeeCap = baseFee + tipcap.
+EIP1559FeeCapBufferBlocks = 0
\ No newline at end of file
diff --git a/core/chains/evm/config/toml/defaults/Mantle_Sepolia.toml b/core/chains/evm/config/toml/defaults/Mantle_Sepolia.toml
index 45fbfc5e0d..705f91142f 100644
--- a/core/chains/evm/config/toml/defaults/Mantle_Sepolia.toml
+++ b/core/chains/evm/config/toml/defaults/Mantle_Sepolia.toml
@@ -1,23 +1,34 @@
 ChainID = '5003'
-ChainType = 'optimismBedrock'
-# FT and FD are both present here because the dev effort rely only on FinalityTagEnabled are still in progress.
-# We expect to be able to rely only on FinalityTagEnabled=true in the short future.
-# https://chainlink-core.slack.com/archives/C05CS33N08N/p1715102940763339?thread_ts=1715102478.537529&cid=C05CS33N08N
-FinalityDepth = 1200
 FinalityTagEnabled = true
+FinalityDepth = 1200
+ChainType = 'optimismBedrock'
 LogPollInterval = '2s'
-NoNewHeadsThreshold = '0'
 MinIncomingConfirmations = 1
+NoNewFinalizedHeadsThreshold = '60m0s'
 
 [HeadTracker]
-HistoryDepth = 600
+HistoryDepth = 1250
 
 [GasEstimator]
-Mode = 'L2Suggested'
-PriceMax = '200 gwei'
-LimitDefault = 100000000
-FeeCapDefault = '200 gwei'
+PriceMax = '120 gwei'
+# Limit values are high as Mantle's GasPrice is in native token (MNT) instead of ETH. Their proprietary TokenRatio parameter is used to adjust fees
+LimitDefault = 80000000000
+LimitMax = 100000000000
+BumpMin = '100 wei'
+BumpPercent = 20
+BumpThreshold = 60
+EIP1559DynamicFees = true
+FeeCapDefault = '120 gwei'
+# Mantle reccomends setting Priority Fee to 0 in their docs linked here: https://docs-v2.mantle.xyz/devs/concepts/tx-fee/eip-1559#application-of-eip-1559-in-mantle-v2-tectonic
+TipCapDefault = '0 wei'
+TipCapMin = '0 wei'
 
 [GasEstimator.BlockHistory]
+# Default is 24, which leads to bumpy gas prices. In CCIP
+# we want to smooth out the gas prices, so we increase the sample size.
 BlockHistorySize = 200
+# The formula for FeeCap is (current block base fee * (1.125 ^ EIP1559FeeCapBufferBlocks) + tipcap)
+# where tipcap is managed by the block history estimators. In the context of CCIP,
+# the gas price is relayed to other changes for quotes so we want accurate/avg not pessimistic values.
+# So we set this to zero so FeeCap = baseFee + tipcap.
 EIP1559FeeCapBufferBlocks = 0
\ No newline at end of file
diff --git a/docs/CONFIG.md b/docs/CONFIG.md
index 82f11e87de..6eb43491ad 100644
--- a/docs/CONFIG.md
+++ b/docs/CONFIG.md
@@ -6496,6 +6496,110 @@ GasLimitDefault = 400000
 
 </p></details>
 
+<details><summary>Mantle Mainnet (5000)</summary><p>
+
+```toml
+AutoCreateKey = true
+BlockBackfillDepth = 10
+BlockBackfillSkip = false
+ChainType = 'optimismBedrock'
+FinalityDepth = 1200
+FinalityTagEnabled = true
+LogBackfillBatchSize = 1000
+LogPollInterval = '2s'
+LogKeepBlocksDepth = 100000
+LogPrunePageSize = 10000
+BackupLogPollerBlockDelay = 100
+MinIncomingConfirmations = 1
+MinContractPayment = '0.00001 link'
+NonceAutoSync = true
+NoNewHeadsThreshold = '3m0s'
+LogBroadcasterEnabled = true
+RPCDefaultBatchSize = 250
+RPCBlockQueryDelay = 1
+FinalizedBlockOffset = 0
+NoNewFinalizedHeadsThreshold = '40m0s'
+
+[Transactions]
+ForwardersEnabled = false
+MaxInFlight = 16
+MaxQueued = 250
+ReaperInterval = '1h0m0s'
+ReaperThreshold = '168h0m0s'
+ResendAfterThreshold = '1m0s'
+
+[Transactions.AutoPurge]
+Enabled = false
+
+[BalanceMonitor]
+Enabled = true
+
+[GasEstimator]
+Mode = 'BlockHistory'
+PriceDefault = '20 gwei'
+PriceMax = '120 gwei'
+PriceMin = '1 gwei'
+LimitDefault = 80000000000
+LimitMax = 100000000000
+LimitMultiplier = '1'
+LimitTransfer = 21000
+EstimateLimit = false
+BumpMin = '100 wei'
+BumpPercent = 20
+BumpThreshold = 60
+EIP1559DynamicFees = true
+FeeCapDefault = '120 gwei'
+TipCapDefault = '0'
+TipCapMin = '0'
+
+[GasEstimator.BlockHistory]
+BatchSize = 25
+BlockHistorySize = 200
+CheckInclusionBlocks = 12
+CheckInclusionPercentile = 90
+EIP1559FeeCapBufferBlocks = 0
+TransactionPercentile = 60
+
+[GasEstimator.FeeHistory]
+CacheTimeout = '10s'
+
+[HeadTracker]
+HistoryDepth = 1250
+MaxBufferSize = 3
+SamplingInterval = '1s'
+MaxAllowedFinalityDepth = 10000
+FinalityTagBypass = true
+
+[NodePool]
+PollFailureThreshold = 5
+PollInterval = '10s'
+SelectionMode = 'HighestHead'
+SyncThreshold = 5
+LeaseDuration = '0s'
+NodeIsSyncingEnabled = false
+FinalizedBlockPollInterval = '5s'
+EnforceRepeatableRead = false
+DeathDeclarationDelay = '10s'
+NewHeadsPollInterval = '0s'
+
+[OCR]
+ContractConfirmations = 4
+ContractTransmitterTransmitTimeout = '10s'
+DatabaseTimeout = '10s'
+DeltaCOverride = '168h0m0s'
+DeltaCJitterOverride = '1h0m0s'
+ObservationGracePeriod = '1s'
+
+[OCR2]
+[OCR2.Automation]
+GasLimit = 5400000
+
+[Workflow]
+GasLimitDefault = 400000
+```
+
+</p></details>
+
 <details><summary>Mantle Sepolia (5003)</summary><p>
 
 ```toml
@@ -6513,12 +6617,12 @@ BackupLogPollerBlockDelay = 100
 MinIncomingConfirmations = 1
 MinContractPayment = '0.00001 link'
 NonceAutoSync = true
-NoNewHeadsThreshold = '0s'
+NoNewHeadsThreshold = '3m0s'
 LogBroadcasterEnabled = true
 RPCDefaultBatchSize = 250
 RPCBlockQueryDelay = 1
 FinalizedBlockOffset = 0
-NoNewFinalizedHeadsThreshold = '0s'
+NoNewFinalizedHeadsThreshold = '1h0m0s'
 
 [Transactions]
 ForwardersEnabled = false
@@ -6535,22 +6639,22 @@ Enabled = false
 Enabled = true
 
 [GasEstimator]
-Mode = 'L2Suggested'
+Mode = 'BlockHistory'
 PriceDefault = '20 gwei'
-PriceMax = '200 gwei'
+PriceMax = '120 gwei'
 PriceMin = '1 gwei'
-LimitDefault = 100000000
-LimitMax = 8000000
+LimitDefault = 80000000000
+LimitMax = 100000000000
 LimitMultiplier = '1'
 LimitTransfer = 21000
 EstimateLimit = false
-BumpMin = '5 gwei'
+BumpMin = '100 wei'
 BumpPercent = 20
-BumpThreshold = 3
-EIP1559DynamicFees = false
-FeeCapDefault = '200 gwei'
-TipCapDefault = '1 wei'
-TipCapMin = '1 wei'
+BumpThreshold = 60
+EIP1559DynamicFees = true
+FeeCapDefault = '120 gwei'
+TipCapDefault = '0'
+TipCapMin = '0'
 
 [GasEstimator.BlockHistory]
 BatchSize = 25
@@ -6564,7 +6668,7 @@ TransactionPercentile = 60
 CacheTimeout = '10s'
 
 [HeadTracker]
-HistoryDepth = 600
+HistoryDepth = 1250
 MaxBufferSize = 3
 SamplingInterval = '1s'
 MaxAllowedFinalityDepth = 10000
@@ -9185,6 +9289,210 @@ GasLimitDefault = 400000
 
 </p></details>
 
+<details><summary>Bitlayer Testnet (200810)</summary><p>
+
+```toml
+AutoCreateKey = true
+BlockBackfillDepth = 10
+BlockBackfillSkip = false
+FinalityDepth = 21
+FinalityTagEnabled = false
+LogBackfillBatchSize = 1000
+LogPollInterval = '15s'
+LogKeepBlocksDepth = 100000
+LogPrunePageSize = 10000
+BackupLogPollerBlockDelay = 100
+MinIncomingConfirmations = 3
+MinContractPayment = '0.00001 link'
+NonceAutoSync = true
+NoNewHeadsThreshold = '3m0s'
+LogBroadcasterEnabled = true
+RPCDefaultBatchSize = 250
+RPCBlockQueryDelay = 1
+FinalizedBlockOffset = 0
+NoNewFinalizedHeadsThreshold = '0s'
+
+[Transactions]
+ForwardersEnabled = false
+MaxInFlight = 16
+MaxQueued = 250
+ReaperInterval = '1h0m0s'
+ReaperThreshold = '168h0m0s'
+ResendAfterThreshold = '1m0s'
+
+[Transactions.AutoPurge]
+Enabled = false
+
+[BalanceMonitor]
+Enabled = true
+
+[GasEstimator]
+Mode = 'FeeHistory'
+PriceDefault = '1 gwei'
+PriceMax = '1 gwei'
+PriceMin = '40 mwei'
+LimitDefault = 8000000
+LimitMax = 8000000
+LimitMultiplier = '1'
+LimitTransfer = 21000
+EstimateLimit = false
+BumpMin = '5 gwei'
+BumpPercent = 20
+BumpThreshold = 3
+EIP1559DynamicFees = false
+FeeCapDefault = '1 gwei'
+TipCapDefault = '1 wei'
+TipCapMin = '1 wei'
+
+[GasEstimator.BlockHistory]
+BatchSize = 25
+BlockHistorySize = 8
+CheckInclusionBlocks = 12
+CheckInclusionPercentile = 90
+TransactionPercentile = 60
+
+[GasEstimator.FeeHistory]
+CacheTimeout = '10s'
+
+[HeadTracker]
+HistoryDepth = 100
+MaxBufferSize = 3
+SamplingInterval = '1s'
+MaxAllowedFinalityDepth = 10000
+FinalityTagBypass = true
+
+[NodePool]
+PollFailureThreshold = 5
+PollInterval = '10s'
+SelectionMode = 'HighestHead'
+SyncThreshold = 5
+LeaseDuration = '0s'
+NodeIsSyncingEnabled = false
+FinalizedBlockPollInterval = '5s'
+EnforceRepeatableRead = false
+DeathDeclarationDelay = '10s'
+NewHeadsPollInterval = '0s'
+
+[OCR]
+ContractConfirmations = 4
+ContractTransmitterTransmitTimeout = '10s'
+DatabaseTimeout = '10s'
+DeltaCOverride = '168h0m0s'
+DeltaCJitterOverride = '1h0m0s'
+ObservationGracePeriod = '1s'
+
+[OCR2]
+[OCR2.Automation]
+GasLimit = 5400000
+
+[Workflow]
+GasLimitDefault = 400000
+```
+
+</p></details>
+
+<details><summary>Bitlayer Mainnet (200901)</summary><p>
+
+```toml
+AutoCreateKey = true
+BlockBackfillDepth = 10
+BlockBackfillSkip = false
+FinalityDepth = 21
+FinalityTagEnabled = false
+LogBackfillBatchSize = 1000
+LogPollInterval = '15s'
+LogKeepBlocksDepth = 100000
+LogPrunePageSize = 10000
+BackupLogPollerBlockDelay = 100
+MinIncomingConfirmations = 3
+MinContractPayment = '0.00001 link'
+NonceAutoSync = true
+NoNewHeadsThreshold = '3m0s'
+LogBroadcasterEnabled = true
+RPCDefaultBatchSize = 250
+RPCBlockQueryDelay = 1
+FinalizedBlockOffset = 0
+NoNewFinalizedHeadsThreshold = '0s'
+
+[Transactions]
+ForwardersEnabled = false
+MaxInFlight = 16
+MaxQueued = 250
+ReaperInterval = '1h0m0s'
+ReaperThreshold = '168h0m0s'
+ResendAfterThreshold = '1m0s'
+
+[Transactions.AutoPurge]
+Enabled = false
+
+[BalanceMonitor]
+Enabled = true
+
+[GasEstimator]
+Mode = 'FeeHistory'
+PriceDefault = '1 gwei'
+PriceMax = '1 gwei'
+PriceMin = '40 mwei'
+LimitDefault = 8000000
+LimitMax = 8000000
+LimitMultiplier = '1'
+LimitTransfer = 21000
+EstimateLimit = false
+BumpMin = '5 gwei'
+BumpPercent = 20
+BumpThreshold = 3
+EIP1559DynamicFees = false
+FeeCapDefault = '1 gwei'
+TipCapDefault = '1 wei'
+TipCapMin = '1 wei'
+
+[GasEstimator.BlockHistory]
+BatchSize = 25
+BlockHistorySize = 8
+CheckInclusionBlocks = 12
+CheckInclusionPercentile = 90
+TransactionPercentile = 60
+
+[GasEstimator.FeeHistory]
+CacheTimeout = '10s'
+
+[HeadTracker]
+HistoryDepth = 100
+MaxBufferSize = 3
+SamplingInterval = '1s'
+MaxAllowedFinalityDepth = 10000
+FinalityTagBypass = true
+
+[NodePool]
+PollFailureThreshold = 5
+PollInterval = '10s'
+SelectionMode = 'HighestHead'
+SyncThreshold = 5
+LeaseDuration = '0s'
+NodeIsSyncingEnabled = false
+FinalizedBlockPollInterval = '5s'
+EnforceRepeatableRead = false
+DeathDeclarationDelay = '10s'
+NewHeadsPollInterval = '0s'
+
+[OCR]
+ContractConfirmations = 4
+ContractTransmitterTransmitTimeout = '10s'
+DatabaseTimeout = '10s'
+DeltaCOverride = '168h0m0s'
+DeltaCJitterOverride = '1h0m0s'
+ObservationGracePeriod = '1s'
+
+[OCR2]
+[OCR2.Automation]
+GasLimit = 5400000
+
+[Workflow]
+GasLimitDefault = 400000
+```
+
+</p></details>
+
 <details><summary>Arbitrum Rinkeby (421611)</summary><p>
 
 ```toml