Send multiple ERC20 tokens and then deposit all of them to a contract as a single tx

[moneyDev1111]

Hey, is it possible to do it? Could you tell how?....

I have 4 ERC-20 tokens and I need to send them to the user from the 'faucet' which is not really a faucet but whatever, and then from the user account deposit it to the contract as a user's balance.

so for a regular separate txs it could look like this, but it's not user friendly at all to sign like 8 or even 12 txs before being able to do smth with the app....

for await (let coin of coinList) {
        const tokenContract = new Contract(coin.address, ERC20_abi, await provider?.getSigner());
	await (await dexContract.withdrawFromFaucet(coin.ticker, parseUnits('1', 'ether'))).wait();

	await (await (tokenContract.connect(await provider?.getSigner()!) as any).approve(dexContract.target, parseUnits(amount, 'ether'))).wait();

	await (await dexContract.deposit(coin.ticker, parseUnits(amount, 'ether'))).wait();
}

thanks a lot

[zemse]

With EOAs, unfortunately, you can't batch transactions right now. Otherwise, you would not have the terrible approve-deposit UX on apps like uniswap. (tho smart wallets have the potential to get over this but most users on EOA).

But what you can consider is, that since your app is testnet you can have a server that funds the user with tokens so the user does not have to make transactions. Actually, a really cool faucet that you can fork is https://github.com/Anish-Agnihotri/MultiFaucet deployed at https://faucet.paradigm.xyz.

[moneyDev1111]

thanks, so I've changed my faucet function in the contract to send all tokens with a single tx, but what about the 2nd part where the user should deposit it to the contract as their balance. rn they should approve 4 times and send tx 4 times which is not convenient at all, is there a way to do it in a single tx? thanks

[zemse]

You can consider using permit function in your contract, openzeppelin and other libraries should have the implementation
Here is the EIP: https://eips.ethereum.org/EIPS/eip-2612

[moneyDev1111]

thank you.

hmmm seems like sth complicated maybe.... need to realize it more in my head))
btw, why can't it be done in this way:
defining a 2 txs for approval and sen...oh I see because it should be approved first....

[moneyDev1111]

@zemse wait but isn't it possible to send a tx in a byteslike form, where all the needed transactions would be executed in a sequence?....