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Synchronous transaction methods wait for the final result instead of returning a task ID. These methods are specifically designed for fast chains and chains with Flashblocks enabled, where transaction confirmation times are minimal.

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Overview

MethodReturnsUse Case
sendTransactionTask IDFire and forget, poll status separately
sendTransactionSyncFinal statusWait for result in one call

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How It Works

  1. Single Call - Submit transaction and receive final status in one API call
  2. Built-in Waiting - SDK handles polling internally until transaction completes or times out
  3. Immediate Feedback - Returns transaction receipt on success, or error details on failure
  4. Timeout Protection - Configurable timeout prevents indefinite waiting

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Code Example

import { createGelatoEvmRelayerClient } from '@gelatocloud/gasless';

const relayer = createGelatoEvmRelayerClient({ apiKey, testnet: true });

const receipt = await relayer.sendTransactionSync({
  chainId: 84532,
  to: '0xContract',
  data: '0xCalldata',
  timeout: 30000
});

console.log('TX hash:', receipt.transactionHash);

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Additional Resources