Questions tagged [usdc]

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Uniswap Allow USDT fee

I want to swap USDT to USDC, but Uniswap shows huge fees, especially Allow USDT (one time). Can someone explain why it happens and what to do?
vqdym's user avatar
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1 vote
2 answers
38 views

Why I can't get meta data of USDC in ethereum?

I tried to get USDC's meta data specifically symbol, name, decimals with ethers.js. However I caught below data name: '', symbol: '', decimals: 0 Are there who meet the same situation? I call ...
ttt's user avatar
  • 97
3 votes
1 answer
319 views

Optimism L2 USDC or USDC.e

I’m trying to build an app that accepts USDC over Optimism L2. Looking on https://optimistic.etherscan.io/tokens There are 2 tokens USDC and USDC.e I imagine that I should use the USDC.e because ...
BigLeo's user avatar
  • 141
0 votes
0 answers
314 views

Token Balances for sepolia testnet not updating in metamask

Token Balances for sepolia testnet not updating in metamask when sent from faucet (aave in this case). I can send test ether which works appropriately. I have added tke token contract address (see ...
John Daniels's user avatar
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0 answers
18 views

As of 2023 June, what is the best method to swap USDC from Arbitrum to Polygon with the least slippage

It's June 2023, what is the most cost effective way to swap USDC from Arbitrum to Polygon?
Patoshi パトシ's user avatar
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0 answers
35 views

Can i receive usdc to my coinbase wallet via email address

I work at a company that has usdc voia coinbase payment method, and it only asks for the email, given thay, coinbase.com doesn't support my country and only coinbase wallet is available, so i provided ...
winteri3coming's user avatar
1 vote
0 answers
335 views

Uniswap: get token price for USDC in solidity

I try to create a function in Solidity which returns the amount of a ERC20 token for a set amount of USDC. For that I go through the following steps: Get the address of the pair. address pairAddress =...
rajohs's user avatar
  • 179
1 vote
1 answer
222 views

How do I access external view data through a proxy's implementation contract with web3.py if the data is stored in the proxy itself?

I want to use web3.py to access all sorts of view-data from smart contracts. In some cases, it's pretty simple. Take USDt: You have the USDt contract on mainnet, ...
PeepoXBT's user avatar
0 votes
0 answers
64 views

Fantom cannot approve spending USDC token

I am doing simple approve operation on USDC token in Fantom network. Here is my payload: functionParams { from: '0xd775b00b5cf6e954aed8408202367a1bae6ac55f', to: '...
Oleksandr Tserkovnyi's user avatar
0 votes
0 answers
20 views

Current tick falling outside of position's lower and upper tick

I would like some assistance on this matter: My pool of reference is ETH/USDC and if my current tick is below my position’s lower tick, am I right to state that all of my position ETH will be ...
Porsche Lim's user avatar
0 votes
1 answer
63 views

Zksync USDC Events

I'm trying to interpret the tx https://explorer.zksync.io/tx/0x97ab638ce8646f058c9fdafa1d30357a4ed9ecb2c5cb0976e60d897a425ffe83#eventlog First log event's data value is 426912250000000. The USDC ...
att's user avatar
  • 165
0 votes
1 answer
97 views

How To Do Bulk Transaction with USDC(AVAX)

I am trying to make a bulk transaction using USDC (AVAX). I saw that it was recommended to use transaction builder. But the directions to use it was unclear to me. i was hoping that someone could help ...
Raphael's user avatar
2 votes
1 answer
483 views

Approving USDC spending using proxy contract

I tested my code on the Arbitrum Goerli network, and it worked because the test USDC contract is the default one with approve and transfer functions. Now I want to go live, and I see that USDC (...
JohnDoeMighty's user avatar
1 vote
1 answer
45 views

Help, my usdcs are lost in genosis safe wallet :)

My USDCs were in the Genosys safe wallet, and I connected the Genosys to Orbiter and bridged from Optimism to Zksync. But now I found out that Ginosys wallet doesn't have ZkSync network 😐 I mean, ...
ehsan h's user avatar
  • 11
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0 answers
460 views

Transaction error. Unable to resolve host "ethereum-rpc.trustwalletapp.com": no address associated with hostname

I got usdc on erc-20 as payment from my client and I am trying to send the usdc from trust wallet to another wallet however I got this response. Transaction error. Unable to resolve host "...
Obee's user avatar
  • 1
0 votes
2 answers
263 views

How to get totalSupply of USDC using solidity?

// SPDX-License-Identifier: MIT pragma solidity ^0.8.7; // import "@openzeppelin/contracts/token/ERC20/IERC20.sol"; interface IERC20 { /** * @dev Returns the amount of tokens in ...
1111's user avatar
  • 61
0 votes
1 answer
340 views

Accidently sent TRC20 Tether to an ERC20 wallet, what do I do?

Used Kraken to Send TRC20 to an ERC20 wallet and i do not see funds in erc20 wallet trans id: 0x60f487f0e36b8be315b3955188bba8b3e62ab60b8f41e1fea256a304ecf0acee
sam's user avatar
  • 1
2 votes
2 answers
309 views

USDC EIP-3009 Ethereum and Polygon code mismatches

We're implementing gasless transactions and we need eip3009 transfer With Authorisation call. We're interested in USDC. I see some mismatches in USDC code on ethereum and polygon. To be accurate in ...
Oleh's user avatar
  • 23
1 vote
2 answers
310 views

How do I withdraw/transfer USDC back into my wallet from my copied/created contract? [duplicate]

I copied/created a front running bot contract that has a WETH contract address. I made a mistake and sent USDC to the contract. Can anyone advise how to get the USDC funds sent back to my wallet ...
user113381's user avatar
0 votes
1 answer
585 views

How to get USDC balance of impersonated wallet in Hardhat test

I am writing a smart contract that uses USDC when a NFT is purchased (so the USDC is transferred from the seller to the buyer). I am trying to test it in Hardhat but I am having troubles when using ...
Miss_scare_all's user avatar
1 vote
0 answers
113 views

How a stable coin, like USDT and USDC works?

I need help regarding stable coin, particularly like USDT and BUSD, pegged to US Dollar. I am working on a stable coin project. The smart contract needed to be developed in solidity and deployed on ...
Asad Hayat's user avatar
0 votes
1 answer
553 views

UniswapV2Router02 swapExactTokensForTokens deadline

im trying to swap some DAI with USDC Using UniswapV2Router02 function swapExactTokensForTokens() with brownie and python by unlocking a DAI token holder account and im getting this error : ...
noro meb's user avatar
  • 328
1 vote
0 answers
326 views

Invalid signature when siging EIP-712 data

I am trying call transferWithAuthorization on the USDC contract (which implements EIP-3009). To do this I need to sign the transaction data and then execute the transaction, however I am getting the ...
ljenkins's user avatar
1 vote
1 answer
40 views

How does USDC ever lose its peg?

If USDC is always backed by $1 worth of fiat or treasuries, how does USDC lose and then rebalance its peg on an ongoing basis?
cormacncheese's user avatar
0 votes
2 answers
2k views

Handle exchanging 6 Decimal Token to 18 Decimal Token (eg. USDC to ERC20)

I am trying to learn Solidity and write a contract that accepts USDC for my token which has 18 decimals. I'm getting confused as how to treat the amount being sent when I buy my ERC20. eg. function ...
momoja's user avatar
  • 239
2 votes
3 answers
5k views

How to get TEST USDC on Avalanche FUJI Testnet

I'm trying to work with FUJI Testnet and I need USDC for my testing. How can I get test USDC on my wallet address on FUJI Testnet (Avalanche Testnet). For my TEST AVAX needs, I run to https://faucet....
momoja's user avatar
  • 239
0 votes
0 answers
243 views

Unable to withdraw from Aave using contracts

I am using Polygon mainnet. Below are the steps I am trying to follow. address private constant _lendingPoolAddressesProvider = 0xd05e3E715d945B59290df0ae8eF85c1BdB684744; address private constant ...
Palakonda Shiva Prasad's user avatar
5 votes
6 answers
17k views

How can I get USDT/USDC for Polygon Mumbai Testnet?

I am working on a DeFi application on Polygon (Mumbai Testnet), and want to integrate stablecoins like USDT or USDC. I have looked for a faucet of USDT and USDC, and found none of them on POLYGON ...
Megabyte's user avatar
0 votes
0 answers
41 views

How can I find out what token was sent from the transaction "input"?

How can I find out what token was sent from the transaction input? Example: This input is from some random transaction. I can find out how many tokens are transferred during the transaction but how ...
Laralex's user avatar
  • 26
6 votes
3 answers
1k views

Is it secure to read USD / ETH rate from exchanges directly without using price oracles?

Is it possible to read USD/ETH rate directly from some known smart contract without an oracle? I have a working solution via an oracle. However, my client says it should be possible to read the ...
Taras Filatov's user avatar
2 votes
2 answers
5k views

Where to find and how to get Kovan USDC testnet tokens

I need USDC Kovan testnet tokens transffered to this address 0x2E9b971e336C825BC41b9FE87376E74f0B3345FE for testing purposes. Token contract for this token is https://kovan.etherscan.io/token/...
igobivo's user avatar
  • 143
0 votes
1 answer
296 views

How to send USDC through geth CLI?

I had 100 USDC transferred to a local Ethereum wallet I control. It shows up as a valid token when I view it in Etherscan. I normally use geth CLI for all Ethereum transactions, but I'm not sure how ...
NULLZ's user avatar
  • 101
0 votes
1 answer
273 views

How do you validate a Token is USDC or any specific Token?

For my usecase I want to check if msg.value, sent to my smart contract, is actually 10 USDC and not any Shitcoin. Is this done with the approve function of ERC20 interface? Because right now I have ...
Markus Haas's user avatar
-1 votes
1 answer
80 views

External ERC-20 token implementation into my contract

I want to implement USDC into my contract which is currently using ETH. I know I need to implement ERC20 interface in order to let my contract know which functions it should expect. But how should I ...
David's user avatar
  • 153
0 votes
0 answers
160 views

Wallet with Tether and ERC20 networks

I am just starting my research in blockchain development, and after some time surfing in this website, I realized that it would be better if I ask my specific question by myself. I am trying to find ...
Yessen Yermukhanbet's user avatar
3 votes
5 answers
5k views

Good Ropsten USDC faucets?

I'm trying to play around with the DyDx Protocol on Ropsten, but to get any further I need to have some USDC in my account. I've had no luck googling for this. There seems to be this website for it, ...
Arshan Khanifar's user avatar
2 votes
1 answer
105 views

Why USDC interest rates are so high compared to USD interest rates?

USDC is a stable coin, pegged to USD, so there should be no risk (or very little) from owning some. However, the lending rate for USDC is between 3% and 13%: https://defirate.com/usdc/ Since higher ...
Sithered's user avatar
  • 123
0 votes
1 answer
2k views

Usdc bep20 from trust wallet sent to usdc erc20 on metamask

Please, I sent a bep20 usdc from my trust wallet account to an erc20 usdc or something like that on my metamask account since almost 24hr, but it's yet to reflect. Can someone kindly help with some ...
Peculiar Tunde Akinyele's user avatar
0 votes
0 answers
13 views

USDT TRANSFER MADE INTO A USDC WALLET [duplicate]

Can a transfer made into the wrong address wallet be reversed? I transferred funds from USDT to my USDC wallet. What can I do to get this funds back? PLEASE HELP ME.
Temitope Adekoya's user avatar
0 votes
0 answers
28 views

How to verify that an address is mine

I transferred usdc to an ethereum address apparently and now am supposed to verify that the address is indeed mine. I see the amount (token) on etherscan but don't know how to claim it. It's asking me ...
Cristal Brown's user avatar
0 votes
1 answer
402 views

Tokem ERC20 eth accept payament usdt

In my smart contract (in moment erc20), is possible create payment function receive eth I would like to receive usdt (or usdc) and not eth, how could I do it? Thanks
Augusto Furlan's user avatar
0 votes
1 answer
136 views

USDC Transaction "Balance" vs. "Token Balance"

I initiated a transaction to transfer from an AAVE wallet to USDC address which shows as successful. However, I do not see the balanced transferred to my USDC (Coinbase) address. Looking on Etherscan....
user2328515's user avatar
2 votes
1 answer
616 views

What is the sequence of events when a transaction is made on Uniswap?

I elect to swap 100 UNI for 700 USDC on UniSwap, but with a low gas fee. In 1 hour, the price of 1 UNI has dropped significantly. would the pending transaction still swap for 700 USDC (as long as ...
timhc22's user avatar
  • 229
0 votes
1 answer
564 views

Best way to conver ETH to a layer 2 ETH or Wrapped ETH to convert to USDC or USDT?

I have a small amount of ETH ($100) and I want to use uniswap to convert it to USDC or USDT, but the fees of $20-$50 is a bit ridiculous. Is there a layer 2 solution that is WORKING that can convert ...
Patoshi パトシ's user avatar
1 vote
0 answers
167 views

How do I make it possible so that my contract will accept USDC tokens [closed]

this will be done as a fee for entry to a raffle. Is this done through interfacing the USDC contract or by interfacing the ERC20 contract?
oBlox's user avatar
  • 23
4 votes
1 answer
2k views

How much UNI can I earn if I become a liquidity provider?

Say I have 10 ETH and 1000 USDC and I want to become a liquidity provider on uniswap. How much UNI can I earn per day and month? And as a liquidity provider, do I lose my 10 ETH or USDC as I'm not ...
Patoshi パトシ's user avatar
0 votes
2 answers
4k views

Transaction shows up on etherscan and metamask said it was sent, but my token balance is still the same

I made USDC transaction and metamask said it was sent and etherscan also say there was a transaction made as seen below. But my USDC balance is still the same as if it never left my account. And ...
Patoshi パトシ's user avatar