🧾 Transaction Simulator

Transaction Simulator integrates seamlessly with Tatum SDK to provide transaction simulation capabilities for EVM-based blockchains.

The Transaction Simulator is designed to bolster the efficiency and security of blockchain transactions. It offers crucial capabilities such as:

  • Simulating native currency transfers.
  • Simulating ERC20 token transfers.

By leveraging these simulations, developers can:

  1. Estimate Fees Accurately: One of the primary challenges in sending blockchain transactions is determining an optimal gas fee that ensures quick confirmation without overpaying. By simulating a transaction before sending it, developers can get a precise estimate of the gas fee, saving costs and improving user experience.
  2. Enhance Safety: Simulating transactions allows developers to anticipate and catch potential errors or vulnerabilities in transaction logic. By identifying these issues in a simulation environment, developers can prevent costly mistakes when deploying actual transactions.
  3. Optimize Transaction Parameters: Beyond just estimating fees, simulating transactions can help developers fine-tune other parameters, such as gas limit or nonce, to optimize transaction performance.

It is built upon popular packages like ethers, ensuring a robust, reliable, and secure foundation for all simulation activities.

πŸš€ Quick Start

  1. Installation

    Firstly, ensure that the @tatumio/transaction-simulator package is set as a dependency within your project. Next, import the Transaction Simulator extension:

    import { TransactionSimulator } from '@tatumio/transaction-simulator';
  2. Initialization

    Create an instance of Tatum SDK passing TransactionSimulator as one of extensions.

    const tatumSdk = await TatumSDK.init<Ethereum>({
         network: Network.ETHEREUM,
         configureExtensions: [

πŸ› οΈ ERC20 Token Transfers:

  1. Define Your Token Transfer Payload: To simulate an ERC20 token transfer, you will use the TokenTransfer object.

    const tokenTransferPayload: TokenTransfer = {
      to: 'recipient_address',
      from: 'sender_address',
      gas: '0xB411', // optional
      gasPrice: '0x4B16C370A', //optional
      value: 500, // example token amount to send
      tokenContractAddress: 'your_erc20_token_contract_address'
  2. Call simulateTransferErc20: With your TokenTransfer payload ready, pass it to the simulateTransferErc20 method.

    const tokenSimulationResult = await simulateTransferErc20(tokenTransferPayload);

    This method fetches token details, simulates the transaction, and returns an estimation of the transaction's outcome along with the necessary gas fees.

  3. Check simulation results:

      "transactionDetails": {
        "from": "0xDce92f40cAdDE2C4e3EA78b8892c540e6bFe2f81",
        "to": "0xaf758da9f7bdaa7590175193388e9c99427cc2d2",
        "tokenContractAddress": "0xdac17f958d2ee523a2206206994597c13d831ec7",
        "data": "0xa9059cbb000000000000000000000000af758da9f7bdaa7590175193388e9c99427cc2d2000000000000000000000000000000000000000000000000000000001908b100",
        "gasLimit": 46097,
        "gasPrice": 20156528394
      "status": "success",
      "balanceChanges": {
        "0xDce92f40cAdDE2C4e3EA78b8892c540e6bFe2f81": {
          "from": 243656557299636170000,
          "to": 243655628144146780000
      "tokenTransfers": {
        "0xdac17f958d2ee523a2206206994597c13d831ec7": {
          "name": "TetherUSD",
          "symbol": "USDT",
          "decimals": 6,
          "0xDce92f40cAdDE2C4e3EA78b8892c540e6bFe2f81": {
            "from": 2387468.080258,
            "to": 2387048.080258
          "0xaf758da9f7bdaa7590175193388e9c99427cc2d2": {
            "from": 422.304,
            "to": 842.304

By using the above methods, you can efficiently predict the behavior and costs of your transactions before actually broadcasting them, ensuring optimized and error-free transactions.

Gas Price Estimation:

  • Methods accept gasPrice as a parameter. If you don't provide it, the gas price will be estimated using the eth_gasPrice method.
  • Methods accept gas as a parameter. If you don't provide it, the gas limit will be estimated using the eth_estimateGas method.

Supported Networks