thirdweb-dev · joaquim-verges · Feb 28, 2025 · Feb 28, 2025
diff --git a/.changeset/eighty-pens-judge.md b/.changeset/eighty-pens-judge.md
@@ -0,0 +1,5 @@
+---
+"thirdweb": minor
+---
+
+Added `estimateUserOpGasCost()` utility function for estimating the total gas cost in wei/ether of user operations
@@ -25,6 +25,21 @@
  * TODO this should be in the chain definition itself
  * @internal
  */
-export function isOpStackChain(chain: Chain) {
-  return opChains.includes(chain.id);
+export async function isOpStackChain(chain: Chain) {
+  if (chain.id === 1337 || chain.id === 31337) {
+    return false;
+  }
+
+  if (opChains.includes(chain.id)) {
+    return true;
+  }
+  // fallback to checking the stack on rpc
+  try {
+    const { getChainMetadata } = await import("./utils.js");
+    const chainMetadata = await getChainMetadata(chain);
+    return chainMetadata.stackType === "optimism_bedrock";
+  } catch {
+    // If the network check fails, assume it's not a OP chain
+    return false;
+  }
 }
@@ -13,6 +13,7 @@ export {
   bundleUserOp,
   getUserOpGasFees,
   estimateUserOpGas,
+  estimateUserOpGasCost,
 } from "../../wallets/smart/lib/bundler.js";
 
 export {

@@ -44,7 +44,7 @@ export async function estimateGasCost(
     );
   }
   let l1Fee: bigint;
-  if (isOpStackChain(transaction.chain)) {
+  if (await isOpStackChain(transaction.chain)) {
     const { estimateL1Fee } = await import("../../gas/estimate-l1-fee.js");
     l1Fee = await estimateL1Fee({
       transaction,

@@ -556,7 +556,7 @@ async function _sendUserOp(args: {
   }
 }
 
-async function getEntrypointFromFactory(
+export async function getEntrypointFromFactory(
   factoryAddress: string,
   client: ThirdwebClient,
   chain: Chain,

@@ -1,27 +1,37 @@
 import { decodeErrorResult } from "viem";
+import type { ThirdwebClient } from "../../../client/client.js";
+import { getContract } from "../../../contract/contract.js";
 import { parseEventLogs } from "../../../event/actions/parse-logs.js";
 import { userOperationRevertReasonEvent } from "../../../extensions/erc4337/__generated__/IEntryPoint/events/UserOperationRevertReason.js";
 import { postOpRevertReasonEvent } from "../../../extensions/erc4337/__generated__/IEntryPoint_v07/events/PostOpRevertReason.js";
+import type { PreparedTransaction } from "../../../transaction/prepare-transaction.js";
 import type { SerializableTransaction } from "../../../transaction/serialize-transaction.js";
 import type { TransactionReceipt } from "../../../transaction/types.js";
+import { isContractDeployed } from "../../../utils/bytecode/is-contract-deployed.js";
 import { type Hex, hexToBigInt } from "../../../utils/encoding/hex.js";
 import { getClientFetch } from "../../../utils/fetch.js";
 import { stringify } from "../../../utils/json.js";
+import { toEther } from "../../../utils/units.js";
+import type { Account } from "../../interfaces/wallet.js";
+import { getEntrypointFromFactory } from "../index.js";
 import {
   type BundlerOptions,
   type EstimationResult,
   type GasPriceResult,
   type PmTransactionData,
+  type SmartWalletOptions,
   type UserOperationReceipt,
   type UserOperationV06,
   type UserOperationV07,
   formatUserOperationReceipt,
 } from "../types.js";
+import { predictSmartAccountAddress } from "./calls.js";
 import {
   ENTRYPOINT_ADDRESS_v0_6,
   MANAGED_ACCOUNT_GAS_BUFFER,
   getDefaultBundlerUrl,
 } from "./constants.js";
+import { prepareUserOp } from "./userop.js";
 import { hexlifyUserOp } from "./utils.js";
 
 /**
@@ -111,6 +121,91 @@ export async function estimateUserOpGas(
   };
 }
 
+/**
+ * Estimate the gas cost of a user operation.
+ * @param args - The options for estimating the gas cost of a user operation.
+ * @returns The estimated gas cost of the user operation.
+ * @example
+ * ```ts
+ * import { estimateUserOpGasCost } from "thirdweb/wallets/smart";
+ *
+ * const gasCost = await estimateUserOpGasCost({
+ *  transactions,
+ *  adminAccount,
+ *  client,
+ *  smartWalletOptions,
+ * });
+ * ```
+ * @walletUtils
+ */
+export async function estimateUserOpGasCost(args: {
+  transactions: PreparedTransaction[];
+  adminAccount: Account;
+  client: ThirdwebClient;
+  smartWalletOptions: SmartWalletOptions;
+}) {
+  // if factory is passed, but no entrypoint, try to resolve entrypoint from factory
+  if (
+    args.smartWalletOptions.factoryAddress &&
+    !args.smartWalletOptions.overrides?.entrypointAddress
+  ) {
+    const entrypointAddress = await getEntrypointFromFactory(
+      args.smartWalletOptions.factoryAddress,
+      args.client,
+      args.smartWalletOptions.chain,
+    );
+    if (entrypointAddress) {
+      args.smartWalletOptions.overrides = {
+        ...args.smartWalletOptions.overrides,
+        entrypointAddress,
+      };
+    }
+  }
+
+  const userOp = await prepareUserOp({
+    transactions: args.transactions,
+    adminAccount: args.adminAccount,
+    client: args.client,
+    smartWalletOptions: args.smartWalletOptions,
+    isDeployedOverride: await isContractDeployed(
+      getContract({
+        address: await predictSmartAccountAddress({
+          adminAddress: args.adminAccount.address,
+          factoryAddress: args.smartWalletOptions.factoryAddress,
+          chain: args.smartWalletOptions.chain,
+          client: args.client,
+        }),
+        chain: args.smartWalletOptions.chain,
+        client: args.client,
+      }),
+    ),
+  });
+
+  let gasLimit = 0n;
+  if ("paymasterVerificationGasLimit" in userOp) {
+    // v0.7
+    gasLimit =
+      BigInt(userOp.paymasterVerificationGasLimit ?? 0) +
+      BigInt(userOp.paymasterPostOpGasLimit ?? 0) +
+      BigInt(userOp.verificationGasLimit ?? 0) +
+      BigInt(userOp.preVerificationGas ?? 0) +
+      BigInt(userOp.callGasLimit ?? 0);
+  } else {
+    // v0.6
+    gasLimit =
+      BigInt(userOp.verificationGasLimit ?? 0) +
+      BigInt(userOp.preVerificationGas ?? 0) +
+      BigInt(userOp.callGasLimit ?? 0);
+  }
+
+  const gasCost = gasLimit * (userOp.maxFeePerGas ?? 0n);
+
+  return {
+    ether: toEther(gasCost),
+    wei: gasCost,
+  };
+}
+
 /**
  * Get the gas fees of a user operation.
  * @param args - The options for getting the gas price of a user operation.

@@ -706,6 +706,32 @@
   smartWalletOptions: SmartWalletOptions;
   waitForDeployment?: boolean;
   isDeployedOverride?: boolean;
+}) {
+  const unsignedUserOp = await prepareUserOp({
+    transactions: options.transactions,
+    adminAccount: options.adminAccount,
+    client: options.client,
+    smartWalletOptions: options.smartWalletOptions,
+    waitForDeployment: options.waitForDeployment,
+    isDeployedOverride: options.isDeployedOverride,
+  });
+  const signedUserOp = await signUserOp({
+    client: options.client,
+    chain: options.smartWalletOptions.chain,
+    adminAccount: options.adminAccount,
+    entrypointAddress: options.smartWalletOptions.overrides?.entrypointAddress,
+    userOp: unsignedUserOp,
+  });
+  return signedUserOp;
+}
+
+export async function prepareUserOp(options: {
+  transactions: PreparedTransaction[];
+  adminAccount: Account;
+  client: ThirdwebClient;
+  smartWalletOptions: SmartWalletOptions;
+  waitForDeployment?: boolean;
+  isDeployedOverride?: boolean;
 }) {
   const config = options.smartWalletOptions;
   const factoryContract = getContract({
@@ -731,6 +757,7 @@
   let executeTx: PreparedTransaction;
   if (options.transactions.length === 1) {
     const tx = options.transactions[0] as PreparedTransaction;
+    // for single tx, simulate fully
     const serializedTx = await toSerializableTransaction({
       transaction: tx,
       from: accountAddress,
@@ -741,13 +768,21 @@
       executeOverride: config.overrides?.execute,
     });
   } else {
+    // for multiple txs, we can't simulate, just encode
     const serializedTxs = await Promise.all(
-      options.transactions.map((tx) =>
-        toSerializableTransaction({
-          transaction: tx,
-          from: accountAddress,
-        }),
-      ),
+      options.transactions.map(async (tx) => {
+        const [data, to, value] = await Promise.all([
+          encode(tx),
+          resolvePromisedValue(tx.to),
+          resolvePromisedValue(tx.value),
+        ]);
+        return {
+          data,
+          to,
+          value,
+          chainId: tx.chain.id,
+        };
+      }),
     );
     executeTx = prepareBatchExecute({
       accountContract,
@@ -756,7 +791,7 @@
     });
   }
 
-  const unsignedUserOp = await createUnsignedUserOp({
+  return createUnsignedUserOp({
     transaction: executeTx,
     factoryContract,
     accountContract,
@@ -766,14 +801,6 @@
     waitForDeployment: options.waitForDeployment,
     isDeployedOverride: options.isDeployedOverride,
   });
-  const signedUserOp = await signUserOp({
-    client: options.client,
-    chain: config.chain,
-    adminAccount: options.adminAccount,
-    entrypointAddress: config.overrides?.entrypointAddress,
-    userOp: unsignedUserOp,
-  });
-  return signedUserOp;
 }
 
 async function waitForAccountDeployed(accountContract: ThirdwebContract) {

@@ -16,7 +16,6 @@ import {
 } from "../../exports/extensions/erc4337.js";
 import { claimTo } from "../../extensions/erc1155/drops/write/claimTo.js";
 import { setContractURI } from "../../extensions/marketplace/__generated__/IMarketplace/write/setContractURI.js";
-import { estimateGasCost } from "../../transaction/actions/estimate-gas-cost.js";
 import { sendAndConfirmTransaction } from "../../transaction/actions/send-and-confirm-transaction.js";
 import { sendBatchTransaction } from "../../transaction/actions/send-batch-transaction.js";
 import { waitForReceipt } from "../../transaction/actions/wait-for-tx-receipt.js";
@@ -27,6 +26,7 @@ import { hashTypedData } from "../../utils/hashing/hashTypedData.js";
 import { sleep } from "../../utils/sleep.js";
 import type { Account, Wallet } from "../interfaces/wallet.js";
 import { generateAccount } from "../utils/generateAccount.js";
+import { estimateUserOpGasCost } from "./lib/bundler.js";
 import { predictSmartAccountAddress } from "./lib/calls.js";
 import { DEFAULT_ACCOUNT_FACTORY_V0_7 } from "./lib/constants.js";
 import {
@@ -87,6 +87,27 @@ describe.sequential(
       expect(predictedAddress).toEqual(smartWalletAddress);
     });
 
+    it("can estimate gas cost", async () => {
+      const gasCost = await estimateUserOpGasCost({
+        transactions: [
+          claimTo({
+            contract,
+            quantity: 1n,
+            to: smartWalletAddress,
+            tokenId: 0n,
+          }),
+        ],
+        adminAccount: personalAccount,
+        client: TEST_CLIENT,
+        smartWalletOptions: {
+          chain,
+          sponsorGas: true,
+          factoryAddress: DEFAULT_ACCOUNT_FACTORY_V0_7,
+        },
+      });
+      expect(gasCost.ether).not.toBe("0");
+    });
+
     it("can sign a msg", async () => {
       const signature = await smartAccount.signMessage({
         message: "hello world",
@@ -202,19 +223,6 @@ describe.sequential(
       expect(isDeployed).toEqual(true);
     });
 
-    it("can estimate a tx", async () => {
-      const estimates = await estimateGasCost({
-        transaction: claimTo({
-          contract,
-          quantity: 1n,
-          to: smartWalletAddress,
-          tokenId: 0n,
-        }),
-        account: smartAccount,
-      });
-      expect(estimates.wei.toString()).not.toBe("0");
-    });
-
     it("can execute a batched tx", async () => {
       const tx = await sendBatchTransaction({
         account: smartAccount,

@@ -29,6 +29,7 @@ import { hashTypedData } from "../../utils/hashing/hashTypedData.js";
 import { sleep } from "../../utils/sleep.js";
 import type { Account, Wallet } from "../interfaces/wallet.js";
 import { generateAccount } from "../utils/generateAccount.js";
+import { estimateUserOpGasCost } from "./lib/bundler.js";
 import { predictSmartAccountAddress } from "./lib/calls.js";
 import { deploySmartAccount } from "./lib/signing.js";
 import { smartWallet } from "./smart-wallet.js";
@@ -74,6 +75,26 @@ describe.runIf(process.env.TW_SECRET_KEY).sequential(
       });
     });
 
+    it("can estimate gas cost", async () => {
+      const gasCost = await estimateUserOpGasCost({
+        transactions: [
+          claimTo({
+            contract,
+            quantity: 1n,
+            to: smartWalletAddress,
+            tokenId: 0n,
+          }),
+        ],
+        adminAccount: personalAccount,
+        client: TEST_CLIENT,
+        smartWalletOptions: {
+          chain,
+          sponsorGas: true,
+        },
+      });
+      expect(gasCost.ether).not.toBe("0");
+    });
+
     it("can connect", async () => {
       expect(smartWalletAddress).toHaveLength(42);
       const predictedAddress = await predictSmartAccountAddress({