Transact with a contract gaslessly
Contract requirements
Contract is compatible with the RallyMobile SDK
Contracts that are ERC2771 compatible are natively supported by the RallyMobile SDK. Those that are not ERC2771 compatible must be whitelisted by us, view the guide here.
Transact with contracts with the relay method
To gaslessly execute a transaction with a contract, create a GSN transaction object 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);
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