Deposit ERC20 from Goerli to Mumbai

Polygon Testnets Mumbai Testnet
1

Hi support team. I’ve been trying to deposit ERC20 tokens from Ethereum Goerli to Matic Mumbai using the PoS Bridge. I’ve already mapped my tokens:

Goerli: 0x15D7A96c78C78C84d8603ad7d210F4Eb7BD0656d
Mumbai : 0x62007d78249c0044b2894be75dadf83ab5ce586a

Now I’m trying to use the sample app from here:
Tutorial Sample App

When I try the ERC20 Deposit, MetaMask pops up to approve my transaction in Goerli, but it never actually deposits anything to Mumbai. Please help.

1 Like
4

Here is the transaction on Ethereum Goerli. I believe this was just to authorize the deposit amount from Ethereum ERC20, but I would’ve expected a second Metamask approval to actually deposit to the Mumbai ERC20 contract:
0x6bcd34f415bd8ed5f7f25d110498bbf37c4991d44e54e550ff5a337bb4ba5b08

5

@shubhangi Also, here is the code for that Deposit button. Looks like there are 2 function calls to the maticPoSClient, but I think its only calling the first one.

  // POS ERC20 functionality

  const depositERC20 = async () => {
    const maticPoSClient = posClientParent();
    const x = inputValue;
    const x1 = x.toString();
    await maticPoSClient.approveERC20ForDeposit(config.posRootERC20, x1, {
      from: account,
    });
    await maticPoSClient.depositERC20ForUser(config.posRootERC20, account, x1, {
      from: account,
    });
  };
7

hi @shubhangi
I tried splitting into a second function for the deposit. Its still not working. When I click the button to make the deposit call, nothing happens. MetaMask does not even pop up.

8

@shubhangi
Any other suggestions on this?

9

Kindly chat with one of our dev on live chat to get a quicker response for the question and any other related issue @rich_hedgefy click here

12

@shubhangi I joined the Discord channel but I’m not getting any quicker responses. However, I did figure out something. I believe the mapped token has a different # of decimals. The root ERC20 token I deployed has 0 decimals, but it seems like the child token was mapped with 18 decimals.

I just minted 1000 * (10^18) tokens into my wallet on L1, and now it works. I was only trying to deposit 10 tokens, but when I have a balance of 1000 tokens, the deposit doesn’t work. However, after I minted the 1000 * 10^18 tokens, then it worked. However, the amount deposited was still only 10 tokens.

Looks like Polygon’s token mapper doesn’t support using 0 decimals. I guess I need to deploy a custom child token?

13

@rich_hedgefy Kindly chat with one of our dev on live chat to get a quicker response for the question and any other related issue click here