diff --git a/api/_utils.ts b/api/_utils.ts
index ecfdf61e8..2f686b0a4 100644
--- a/api/_utils.ts
+++ b/api/_utils.ts
@@ -1995,11 +1995,14 @@ export function getCachedFillGasUsage(
     );
     // We don't care about the gas token price or the token gas price, only the raw gas units. In the API
     // we'll compute the gas price separately.
+    const markups = getGasMarkup(deposit.destinationChainId);
     const gasCosts = await relayerFeeCalculatorQueries.getGasCosts(
       buildDepositForSimulation(deposit),
       overrides?.relayerAddress,
       {
         gasPrice,
+        baseFeeMultiplier: markups.baseFeeMarkup,
+        priorityFeeMultiplier: markups.priorityFeeMarkup,
         opStackL1GasCostMultiplier: sdk.utils.chainIsOPStack(
           deposit.destinationChainId
         )
diff --git a/api/gas-prices.ts b/api/gas-prices.ts
index 2fb63a32b..427da081e 100644
--- a/api/gas-prices.ts
+++ b/api/gas-prices.ts
@@ -71,10 +71,9 @@ const handler = async (
           const relayerFeeCalculatorQueries = getRelayerFeeCalculatorQueries(
             Number(chainId)
           );
-          const opStackL1GasCostMultiplier = getGasMarkup(
-            Number(chainId)
-          ).opStackL1DataFeeMarkup;
-          const { nativeGasCost, tokenGasCost, opStackL1GasCost } =
+          const { baseFeeMarkup, priorityFeeMarkup, opStackL1DataFeeMarkup } =
+            getGasMarkup(Number(chainId));
+          const { nativeGasCost, tokenGasCost, opStackL1GasCost, gasPrice } =
             await relayerFeeCalculatorQueries.getGasCosts(
               deposit,
               relayerFeeCalculatorQueries.simulatedRelayerAddress,
@@ -82,17 +81,22 @@ const handler = async (
                 // Pass in the already-computed gasPrice into this query so that the tokenGasCost includes
                 // the scaled gas price,
                 // e.g. tokenGasCost = nativeGasCost * (baseFee * baseFeeMultiplier + priorityFee).
+                // Except for Linea, where the gas price is dependent on the unsignedTx produced from the deposit,
+                // so let the SDK compute its gas price here.
                 gasPrice:
                   Number(chainId) === CHAIN_IDs.LINEA
                     ? undefined
                     : gasPrices[i].maxFeePerGas,
-                opStackL1GasCostMultiplier,
+                opStackL1GasCostMultiplier: opStackL1DataFeeMarkup,
+                baseFeeMultiplier: baseFeeMarkup,
+                priorityFeeMultiplier: priorityFeeMarkup,
               }
             );
           return {
             nativeGasCost,
             tokenGasCost,
             opStackL1GasCost,
+            gasPrice,
           };
         }
       )
@@ -103,12 +107,23 @@ const handler = async (
         Object.keys(chainIdsWithToken).map((chainId, i) => [
           chainId,
           {
-            gasPrice: gasPrices[i].maxFeePerGas.toString(),
+            gasPrice:
+              Number(chainId) === CHAIN_IDs.LINEA
+                ? gasCosts[i].gasPrice.toString()
+                : gasPrices[i].maxFeePerGas.toString(),
             gasPriceComponents: {
-              maxFeePerGas: gasPrices[i].maxFeePerGas
-                .sub(gasPrices[i].maxPriorityFeePerGas)
-                .toString(),
-              priorityFeePerGas: gasPrices[i].maxPriorityFeePerGas.toString(),
+              // Linea hardcodes base fee at 7 wei so we can always back it out fromthe gasPrice returned by the
+              // getGasCosts method.
+              maxFeePerGas:
+                Number(chainId) === CHAIN_IDs.LINEA
+                  ? gasCosts[i].gasPrice.sub(7).toString()
+                  : gasPrices[i].maxFeePerGas
+                      .sub(gasPrices[i].maxPriorityFeePerGas)
+                      .toString(),
+              priorityFeePerGas:
+                Number(chainId) === CHAIN_IDs.LINEA
+                  ? "7"
+                  : gasPrices[i].maxPriorityFeePerGas.toString(),
               baseFeeMultiplier: ethers.utils.formatEther(
                 getGasMarkup(chainId).baseFeeMarkup
               ),
@@ -118,7 +133,9 @@ const handler = async (
               opStackL1GasCostMultiplier: sdk.utils.chainIsOPStack(
                 Number(chainId)
               )
-                ? ethers.utils.formatEther(getGasMarkup(chainId).baseFeeMarkup)
+                ? ethers.utils.formatEther(
+                    getGasMarkup(chainId).opStackL1DataFeeMarkup
+                  )
                 : undefined,
             },
             nativeGasCost: gasCosts[i].nativeGasCost.toString(),