diff --git a/package.json b/package.json
index 7428d47e..f212ad64 100644
--- a/package.json
+++ b/package.json
@@ -1,7 +1,7 @@
 {
   "name": "@across-protocol/sdk",
   "author": "UMA Team",
-  "version": "3.4.7",
+  "version": "3.4.8",
   "license": "AGPL-3.0",
   "homepage": "https://docs.across.to/reference/sdk",
   "files": [
diff --git a/src/gasPriceOracle/adapters/ethereum.ts b/src/gasPriceOracle/adapters/ethereum.ts
index 3c8fbca1..a75e8b0f 100644
--- a/src/gasPriceOracle/adapters/ethereum.ts
+++ b/src/gasPriceOracle/adapters/ethereum.ts
@@ -43,14 +43,14 @@ export async function eip1559Raw(
     provider.getBlock("pending"),
     (provider as providers.JsonRpcProvider).send("eth_maxPriorityFeePerGas", []),
   ]);
-  let maxPriorityFeePerGas = BigNumber.from(_maxPriorityFeePerGas);
-  const flooredPriorityFeePerGas = parseUnits(process.env[`MIN_PRIORITY_FEE_PER_GAS_${chainId}`] || "0", 9);
-  if (maxPriorityFeePerGas.lt(flooredPriorityFeePerGas)) {
-    maxPriorityFeePerGas = BigNumber.from(flooredPriorityFeePerGas);
-  }
+  const maxPriorityFeePerGas = BigNumber.from(_maxPriorityFeePerGas);
   assert(BigNumber.isBigNumber(baseFeePerGas), `No baseFeePerGas received on ${getNetworkName(chainId)}`);
 
-  const scaledPriorityFee = maxPriorityFeePerGas.mul(priorityFeeMultiplier).div(fixedPointAdjustment);
+  let scaledPriorityFee = maxPriorityFeePerGas.mul(priorityFeeMultiplier).div(fixedPointAdjustment);
+  const flooredPriorityFeePerGas = parseUnits(process.env[`MIN_PRIORITY_FEE_PER_GAS_${chainId}`] || "0", 9);
+  if (scaledPriorityFee.lt(flooredPriorityFeePerGas)) {
+    scaledPriorityFee = BigNumber.from(flooredPriorityFeePerGas);
+  }
   const scaledBaseFee = baseFeePerGas.mul(baseFeeMultiplier).div(fixedPointAdjustment);
   return {
     maxFeePerGas: scaledPriorityFee.add(scaledBaseFee),
diff --git a/src/relayFeeCalculator/chain-queries/baseQuery.ts b/src/relayFeeCalculator/chain-queries/baseQuery.ts
index 942eb0ec..f7870a5b 100644
--- a/src/relayFeeCalculator/chain-queries/baseQuery.ts
+++ b/src/relayFeeCalculator/chain-queries/baseQuery.ts
@@ -96,6 +96,7 @@ export class QueryBase implements QueryInterface {
       nativeGasCost,
       tokenGasCost,
       gasPrice: impliedGasPrice,
+      opStackL1GasCost,
     } = await this.estimateGas(tx, relayer, this.provider, {
       gasPrice,
       gasUnits,
@@ -109,6 +110,7 @@ export class QueryBase implements QueryInterface {
       nativeGasCost,
       tokenGasCost,
       gasPrice: impliedGasPrice,
+      opStackL1GasCost,
     };
   }
 
@@ -160,6 +162,7 @@ export class QueryBase implements QueryInterface {
     let tokenGasCost: BigNumber;
 
     // OP stack is a special case; gas cost is computed by the SDK, without having to query price.
+    let opStackL1GasCost: BigNumber | undefined;
     if (chainIsOPStack(chainId)) {
       assert(isOptimismL2Provider(provider), `Unexpected provider for chain ID ${chainId}.`);
       const populatedTransaction = await voidSigner.populateTransaction({
@@ -167,9 +170,9 @@ export class QueryBase implements QueryInterface {
         gasLimit: nativeGasCost, // prevents additional gas estimation call
       });
       const l1GasCost = await (provider as L2Provider<providers.Provider>).estimateL1GasCost(populatedTransaction);
-      const scaledL1GasCost = l1GasCost.mul(opStackL1GasCostMultiplier).div(fixedPointAdjustment);
+      opStackL1GasCost = l1GasCost.mul(opStackL1GasCostMultiplier).div(fixedPointAdjustment);
       const l2GasCost = nativeGasCost.mul(gasPrice);
-      tokenGasCost = scaledL1GasCost.add(l2GasCost);
+      tokenGasCost = opStackL1GasCost.add(l2GasCost);
     } else {
       tokenGasCost = nativeGasCost.mul(gasPrice);
     }
@@ -178,6 +181,7 @@ export class QueryBase implements QueryInterface {
       nativeGasCost, // Units: gas
       tokenGasCost, // Units: wei (nativeGasCost * wei/gas)
       gasPrice: BigNumber.from(gasPrice.toString()), // Units: wei/gas, does not include l1GasCost for OP stack chains
+      opStackL1GasCost,
     };
   }
 
diff --git a/src/utils/common.ts b/src/utils/common.ts
index 3b5c0337..7dc34d57 100644
--- a/src/utils/common.ts
+++ b/src/utils/common.ts
@@ -227,6 +227,7 @@ export type TransactionCostEstimate = {
   nativeGasCost: BigNumber; // Units: gas
   tokenGasCost: BigNumber; // Units: wei (nativeGasCost * wei/gas)
   gasPrice: BigNumber; // Units: wei/gas
+  opStackL1GasCost?: BigNumber; // Units: wei (L1 gas cost * wei/gas)
 };
 
 export function randomAddress() {
diff --git a/test/GasPriceOracle.test.ts b/test/GasPriceOracle.test.ts
index e5c06510..df1d06b8 100644
--- a/test/GasPriceOracle.test.ts
+++ b/test/GasPriceOracle.test.ts
@@ -198,7 +198,7 @@ describe("Gas Price Oracle", function () {
 
     // Base fee should be multiplied by multiplier. Returned max fee includes priority fee
     // so back it out before scaling.
-    const expectedMarkedUpPriorityFee = minPriorityFee.mul(priorityFeeMultiplier).div(fixedPointAdjustment);
+    const expectedMarkedUpPriorityFee = minPriorityFee;
     const expectedMarkedUpMaxFeePerGas = stdLastBaseFeePerGas
       .mul(baseFeeMultiplier)
       .div(fixedPointAdjustment)