Questions tagged [erc-20-approve]
The erc-20-approve tag has no usage guidance.
9
questions
12
votes
4
answers
5k
views
Is it possible to batch approve + transfer an ERC-20 token?
In our dapp, we currently have the following user flow:
Approve the Sablier contract to spend up to x ERC20 tokens
Transfer the x ERC20 tokens to the Sablier contract
This is not super bad UX, but ...
- 17.3k
0
votes
1
answer
418
views
Can Metamask be used for all ERC20 token?
How can I use WETH with Metamask wallet?
I can see ETH in my Metamask (Rinkeby TestNet, it works on Mainnet) but can not use other tokens.
Any Repository or lead will be appreciated.
If yes, What will ...
- 119
4
votes
2
answers
12k
views
What is the use case of transferFrom function in ERC20 token contract?
In @openZeppelin's ERC20 implementation here is the code for function transferFrom:
function transferFrom(address sender, address recipient, uint256 amount) public virtual override returns (bool) {
...
- 639
2
votes
1
answer
2k
views
"gas estimation failed" error using Uniswap. Can't fix it, please help
I can't sell alt-tokens back into ETH. This is an issue with multiple tokens, not just one and they all have very high liquidity ($Kabosu and $OHMI).
I immediately get the error 'gas estimation failed'...
- 21
2
votes
1
answer
1k
views
Fail with error 'TransferHelper: TRANSFER_FROM_FAILED' Although approved
I'm trying to make a swap programmatically, I did the following approvals using ethers.js:
token0.approve(wallet.address, amount);
token1.approve(wallet.address, amount);
token0.approve(...
- 121
1
vote
1
answer
3k
views
Contract with function payable to receive ERC20 token in one shot?
I am trying to write a smart contract with a function that receives an ERC20 token (i.e.: DAI), but the transaction to call this function is always failing.
Let's assume I first record the ERC20 ...
- 3,379
1
vote
3
answers
5k
views
IERC20.approve(spender, amount) thinks the owner is also the contract
I have these functions and deployed my contract to Ropsten testnet.
function setSmartContractAllownace(uint daiAmountIn) public {
IERC20 daiToken = IERC20(ropstenDAI);
daiToken.approve(...
1
vote
1
answer
909
views
How to make a delegatecall to external ERC20 token's approve function?
What I would like to do is something like this:
function testCall(uint amount) public virtual returns (bool) {
address tta = address(0xE7B6....);
(bool success, bytes memory result) = tta....
- 808
0
votes
2
answers
931
views
Failing to trying to approve contract using ethers.js (CALL_EXCEPTION or cannot estimate gas)
I am having trouble calling a simple ERC-20 approve function from the front end on the Arbitrum network. Any insight is greatly appreciated. I will outline my code below.
I am retrieving the provider ...
- 3