ritmex-bot/docs/nado/developer-resources/api/withdrawing-on-chain.md

Withdrawing (on-chain)

You can withdraw collateral from Nado directly on-chain, by submitting a slow-mode transaction via the Endpoint contract (see Contracts for addresses).

{% hint style="info" %} Note:

• This is an alternative to withdrawing collateral via our off-chain sequencer. See Withdraw Collateral for more details.
• Slow mode transactions have a 1 USDT0 fee; as such, an approval of 1 USDT0 is required for the slow mode withdrawal to succeed. {% endhint %}

Steps

1. Assemble the bytes needed for a withdraw collateral transaction by encoding the following struct alongside the transaction type 2:

struct WithdrawCollateral {
    bytes32 sender;
    uint32 productId;
    uint128 amount;
    uint64 nonce;
}

2. Submit the transaction via submitSlowModeTransaction on our Endpoint contract.

Example

function withdrawNadoCollateral(address nadoEndpoint, bytes32 sender, uint32 productId, uint128 amount) internal {
    WithdrawCollateral memory withdrawal = new WithdrawCollateral(sender, productId, amount, 0);
    bytes memory tx = abi.encodePacked(2, abi.encode(withdrawal));
    IEndpoint(nadoEndpoint).submitSlowModeTransaction(tx);
}

Once the transaction is confirmed, it may take a few seconds for it to make its way into the Nado offchain sequencer and for the withdrawal to be processed.