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Transaction Simulator

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

📖 Description

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. 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. 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. 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.

🚀 Quick Start

  1. 1.
    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. 2.
    Create an instance of Tatum SDK passing TransactionSimulator as one of extensions.
    const tatumSdk = await TatumSDK.init<Ethereum>({
    network: Network.ETHEREUM,
    configureExtensions: [

🛠️ ERC20 Token Transfers:

  1. 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. 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. 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

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