RallyProtocol
React Native / Expo
React Native / Expo
  • Getting Started
    • Overview
    • Installation
  • Embedded wallets
    • Getting started
    • Create wallets
    • Manage wallets
    • How it works
  • Gasless Transactions
    • Getting Started
    • Read balances
    • Transfer tokens gaslessly
    • Deploy a contract gaslessly
    • Transact with a contract gaslessly
    • Using without embedded wallets
      • Getting started
      • Typescript Example
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    • Full API Reference
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On this page
  • Contract requirements
  • Transact with contracts with the relay method
  1. Gasless Transactions

Transact with a contract gaslessly

PreviousDeploy a contract gaslesslyNextUsing without embedded wallets

Last updated 8 months ago

An API key is required to use the infrastructure to power gasless transactions. Visit to generate both Amoy and Mainnet Polygon API keys.

Contract requirements

  1. Contract is compatible with the RallyMobile SDK

    1. Contracts that are are natively supported by the RallyMobile SDK. Those that are not ERC2771 compatible must be whitelisted by us,

Transact with contracts with the relay method

To gaslessly execute a transaction with a contract, create a and use the relay() method to send the transaction to our relayer.

import { RlyAmoyNetwork } from 'rly-network-mobile-sdk';
import ethers from 'ethers';
....

//get web3 provider

const provider = new ethers.providers.JsonRpcProvider(providerUrl);

//get instance of your contract 

const myContract =  new ethers.Contract(contractAddress, contractAbi, signer);

//populate raw transaction object
const tx = await myContract.populateTransaction.myMethod.(
    param1,
    param2
  );

//get gas estimate for transaction
  const gas = await myContract.estimateGas.myMethod.(param1, param2);

//get current network fee data
  const { maxFeePerGas, maxPriorityFeePerGas } = await provider.getFeeData();

//create relay tx object

  const gsnTx = {
    from: account.address,
    data: tx.data,
    to: tx.to,
    gas: gas._hex,
    maxFeePerGas: maxFeePerGas._hex,
    maxPriorityFeePerGas: maxPriorityFeePerGas._hex,
  } as GsnTransactionDetails;

// relay transaction 

await RlyAmoyNetwork.relay(gsnTx);
https://app.rallyprotocol.com/
GSN transaction object
ERC2771 compatible
view the guide here.