Token USD Coin (Arb1)

 

Overview ERC20

Price
$1.00 @ 0.000781 ETH (+0.06%)
Fully Diluted Market Cap
Total Supply:
628,990,126.053977 USDC

Holders:
250,104 addresses
Balance
0 USDC

Value
$0.00
0x6fe0c1530acd0d6616ed3d1ea6374d53ea2fba9e
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OVERVIEW

USDC is a fully collateralized US Dollar stablecoin developed by CENTRE, the open source project with Circle being the first of several forthcoming issuers.

Market

Volume (24H):$1,976,507,066.00
Market Capitalization:$42,828,088,618.00
Circulating Supply:42,778,153,794.00 USDC
Market Data Source: Coinmarketcap


Update? Click here to update the token ICO / general information
# Exchange Pair Price  24H Volume % Volume
1
Uniswap (v3)
0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2$1.002
0.0000582 Btc
$267,356,857.00
262,611,285.014 0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48
34.5853%
2
LBank
ETH-USDC$1.001
0.0000581 Btc
$130,751,836.00
101,994.069 ETH
0.0134%
3
Uniswap (v3)
0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48-0XDAC17F958D2EE523A2206206994597C13D831EC7$1.002
0.0000582 Btc
$126,749,885.00
126,452,610.561 0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48
16.6535%
4
MEXC Global
ETH-USDC$1.001
0.0000581 Btc
$119,665,628.00
93,342.536 ETH
0.0123%
5
Bitforex
USDC-USDT$1.001
0.0000581 Btc
$99,762,251.00
99,673,953.495 USDC
13.1268%
6
MEXC Global
BTC-USDC$1.001
0.0000581 Btc
$84,873,948.00
4,929.332 BTC
0.0006%
7
Bitforex
BTC-USDC$1.001
0.0000581 Btc
$77,793,717.00
4,519.212 BTC
0.0006%
8
BitMart
BTC-USDC$1.001
0.0000581 Btc
$70,523,512.00
4,096.035 BTC
0.0005%
9
LBank
BTC-USDC$1.001
0.0000581 Btc
$56,389,875.00
3,276.161 BTC
0.0004%
10
Uniswap (Arbitrum One)
0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1-0XFF970A61A04B1CA14834A43F5DE4533EBDDB5CC8$1.001
0.0000581 Btc
$26,891,168.00
21,318.743 0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1
0.0028%
11
WhiteBIT
USDC-USDT$1.001
0.0000581 Btc
$23,135,227.00
23,114,750.667 USDC
3.0442%
12
Uniswap (v3)
0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2$1.002
0.0000582 Btc
$23,085,377.00
22,829,940.352 0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48
3.0067%
13
Kraken
USDC-USDT$1.001
0.0000581 Btc
$21,905,921.00
21,884,251.730 USDC
2.8821%
14
Huobi
USDC-USDT$1.001
0.0000581 Btc
$21,593,368.00
21,572,476.691 USDC
2.8410%
15
Kraken
USDC-USD$0.9999
0.0000581 Btc
$21,491,704.00
21,493,853.129 USDC
2.8307%
16
Kraken
USDC-EUR$0.9988
0.0000580 Btc
$18,196,616.00
18,219,369.008 USDC
2.3994%
17
BingX
BTC-USDC$1.001
0.0000581 Btc
$16,419,549.00
963.338 BTC
0.0001%
18
Bybit
ETH-USDC$1.001
0.0000581 Btc
$14,091,086.00
10,987.410 ETH
0.0014%
19
WhiteBIT
BTC-USDC$1.001
0.0000581 Btc
$13,753,323.00
798.810 BTC
0.0001%
20
DigiFinex
USDC-USDT$1.001
0.0000581 Btc
$13,036,555.00
13,023,713.761 USDC
1.7152%
21
BKEX
ETH-USDC$1.001
0.0000581 Btc
$12,544,739.00
9,925.098 ETH
0.0013%
22
P2B
USDC-USDT$1.001
0.0000581 Btc
$11,467,484.00
11,456,630.000 USDC
1.5088%
23
P2B
USDC-BUSD$1.00
0.0000581 Btc
$11,440,100.00
11,438,233.500 USDC
1.5064%
24
BKEX
BTC-USDC$1.001
0.0000581 Btc
$11,002,866.00
644.350 BTC
0.0001%
25
Bybit
BTC-USDC$1.001
0.0000581 Btc
$9,730,001.00
565.177 BTC
0.0001%
26
Bybit
USDC-USDT$1.001
0.0000581 Btc
$9,410,715.00
9,400,465.850 USDC
1.2380%
27
OKX
ETH-USDC$1.001
0.0000581 Btc
$9,088,881.00
7,189.279 ETH
0.0009%
28
OKX
USDC-USDT$1.001
0.0000581 Btc
$8,040,463.00
8,033,021.375 USDC
1.0579%
29
DigiFinex
ETH-USDC$1.001
0.0000581 Btc
$7,385,393.00
5,758.500 ETH
0.0008%
30
BKEX
USDC-USDT$1.001
0.0000581 Btc
$6,123,450.00
6,117,803.315 USDC
0.8057%
31
OKX
BTC-USDC$1.001
0.0000581 Btc
$5,574,436.00
326.402 BTC
0.0000%
32
BingX
ETH-USDC$1.001
0.0000581 Btc
$5,416,794.00
4,290.812 ETH
0.0006%
33
KuCoin
BTC-USDC$1.001
0.0000581 Btc
$5,356,047.00
311.115 BTC
0.0000%
34
Uniswap (v3)
0X6B175474E89094C44DA98B954EEDEAC495271D0F-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48$1.002
0.0000582 Btc
$4,931,945.00
4,919,582.699 0X6B175474E89094C44DA98B954EEDEAC495271D0F
0.6479%
35
DigiFinex
BTC-USDC$1.001
0.0000581 Btc
$4,879,382.00
283.377 BTC
0.0000%
36
KuCoin
USDT-USDC$1.001
0.0000581 Btc
$4,760,712.00
4,757,286.047 USDT
0.6265%
37
KuCoin
USDC-USDT$1.001
0.0000581 Btc
$4,739,368.00
4,734,991.953 USDC
0.6236%
38
Kraken
USDC-GBP$1.00
0.0000581 Btc
$3,981,860.00
3,980,287.548 USDC
0.5242%
39
XT.COM
USDC-USDT$1.001
0.0000581 Btc
$3,635,121.00
3,631,564.570 USDC
0.4783%
40
Bitstamp
USDC-USD$0.9992
0.0000580 Btc
$3,530,356.00
3,533,111.839 USDC
0.4653%
41
Uniswap (v2)
0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2$0.9991
0.0000580 Btc
$3,476,621.00
3,426,339.536 0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48
0.4512%
42
BitMart
ETH-USDC$1.001
0.0000581 Btc
$3,370,140.00
2,628.649 ETH
0.0003%
43
KyberSwap Elastic (Ethereum)
0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48-0XDAC17F958D2EE523A2206206994597C13D831EC7$1.001
0.0000581 Btc
$3,162,604.00
3,159,714.605 0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48
0.4161%
44
Kraken
BTC-USDC$1.001
0.0000581 Btc
$3,153,181.00
183.068 BTC
0.0000%
45
Gemini
USDC-USD$0.9999
0.0000581 Btc
$3,123,653.00
3,123,903.157 USDC
0.4114%
46
KuCoin
ETH-USDC$1.001
0.0000581 Btc
$2,316,615.00
1,806.693 ETH
0.0002%
47
Bitget
BTC-USDC$1.001
0.0000581 Btc
$2,267,051.00
132.688 BTC
0.0000%
48
Bitstamp
USDC-EUR$0.9986
0.0000580 Btc
$2,078,047.00
2,080,986.117 USDC
0.2741%
49
Sushiswap
0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2$1.002
0.0000582 Btc
$2,049,669.00
2,028,545.663 0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48
0.2672%
50
Sushiswap (Arbitrum One)
0XFF970A61A04B1CA14834A43F5DE4533EBDDB5CC8-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1$1.001
0.0000581 Btc
$2,021,838.00
1,991,540.355 0XFF970A61A04B1CA14834A43F5DE4533EBDDB5CC8
0.2623%
51
Uniswap (v3)
0X2260FAC5E5542A773AA44FBCFEDF7C193BC2C599-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48$1.002
0.0000582 Btc
$1,843,722.00
107.649 0X2260FAC5E5542A773AA44FBCFEDF7C193BC2C599
0.0000%
52
MEXC Global
EOS-USDC$1.001
0.0000581 Btc
$1,841,396.00
1,785,052.870 EOS
0.2351%
53
LBank
USDC-USDT$1.001
0.0000581 Btc
$1,697,173.00
1,695,663.597 USDC
0.2233%
54
Kraken
ETH-USDC$1.001
0.0000581 Btc
$1,620,520.00
1,262.878 ETH
0.0002%
55
MEXC Global
BCH-USDC$1.001
0.0000581 Btc
$1,312,067.00
11,751.410 BCH
0.0015%
56
MEXC Global
XRP-USDC$1.001
0.0000581 Btc
$1,244,810.00
3,182,178.300 XRP
0.4191%
57
Bitfinex
UDC-USDT$1.001
0.0000581 Btc
$1,225,976.00
1,224,950.422 UDC
0.1613%
58
Hotbit
USDC-USDT$0.9998
0.0000581 Btc
$1,223,835.00
1,224,022.360 USDC
0.1612%
59
Binance US
BTC-USDC$1.001
0.0000581 Btc
$1,109,286.00
64.400 BTC
0.0000%
60
Binance US
USDC-USD$1.00
0.0000581 Btc
$1,052,325.00
1,052,324.662 USDC
0.1386%
61
Canto Dex
0X4E71A2E537B7F9D9413D3991D37958C0B5E1E503-0X80B5A32E4F032B2A058B4F29EC95EEFEEB87ADCD$1.001
0.0000581 Btc
$863,840.00
852,859.948 0X4E71A2E537B7F9D9413D3991D37958C0B5E1E503
0.1123%
62
Bitget
ETH-USDC$1.001
0.0000581 Btc
$858,648.00
680.333 ETH
0.0001%
63
Tidex
USDC-USDT$1.001
0.0000581 Btc
$818,376.00
817,683.004 USDC
0.1077%
64
Bitget
XRP-USDC$1.001
0.0000581 Btc
$783,752.00
2,001,972.000 XRP
0.2637%
65
Bitget
USDC-USDT$1.001
0.0000581 Btc
$746,948.00
746,146.171 USDC
0.0983%
66
MEXC Global
LTC-USDC$1.001
0.0000581 Btc
$697,702.00
8,970.300 LTC
0.0012%
67
MEXC Global
TRX-USDC$1.001
0.0000581 Btc
$665,326.00
12,214,144.300 TRX
1.6086%
68
Coinbase Exchange
USDT-USDC$1.001
0.0000581 Btc
$572,195.00
571,881.600 USDT
0.0753%
69
PancakeSwap (v2)
0X2170ED0880AC9A755FD29B2688956BD959F933F8-0X8AC76A51CC950D9822D68B83FE1AD97B32CD580D$1.00
0.0000581 Btc
$542,063.00
428.906 0X2170ED0880AC9A755FD29B2688956BD959F933F8
0.0001%
70
Tidex
BTC-USDC$1.001
0.0000581 Btc
$527,176.00
30.588 BTC
0.0000%
71
BitMart
USDC-USDT$1.001
0.0000581 Btc
$517,246.00
516,732.420 USDC
0.0681%
72
BitMart
DOGE-USDC$1.001
0.0000581 Btc
$502,714.00
5,111,478.000 DOGE
0.6732%
73
Coinbase Exchange
USDC-GBP$0.9995
0.0000580 Btc
$365,992.00
366,161.490 USDC
0.0482%
74
PancakeSwap (v2)
0X8AC76A51CC950D9822D68B83FE1AD97B32CD580D-BUSD$0.9979
0.0000579 Btc
$353,149.00
352,892.487 0X8AC76A51CC950D9822D68B83FE1AD97B32CD580D
0.0465%
75
Coinfield
BTC-USDC$1.001
0.0000581 Btc
$340,086.00
19.754 BTC
0.0000%
76
Okcoin
USDC-USD$0.9998
0.0000581 Btc
$308,396.00
308,458.021 USDC
0.0406%
77
Maiar
WEGLD-BD4D79-USDC-C76F1F$1.029
0.0000597 Btc
$299,630.00
6,580.096 WEGLD-BD4D79
0.0009%
78
BKEX
ATOM-USDC$1.001
0.0000581 Btc
$296,856.00
30,542.013 ATOM
0.0040%
79
KuCoin
BUSD-USDC$1.001
0.0000581 Btc
$282,543.00
282,080.189 BUSD
0.0371%
80
Kraken
USDC-AUD$0.9999
0.0000581 Btc
$280,063.00
280,086.005 USDC
0.0369%
81
Bitget
BCH-USDC$1.001
0.0000581 Btc
$279,097.00
2,519.396 BCH
0.0003%
82
Coinbase Exchange
USDC-EUR$0.9993
0.0000580 Btc
$267,296.00
267,488.840 USDC
0.0352%
83
BitMart
ADA-USDC$1.001
0.0000581 Btc
$262,997.00
837,708.000 ADA
0.1103%
84
Phemex
USDC-USDT$1.001
0.0000581 Btc
$239,810.00
239,573.100 USDC
0.0316%
85
BKEX
SOL-USDC$1.001
0.0000581 Btc
$238,130.00
17,531.265 SOL
0.0023%
86
Bitget
BNB-USDC$1.001
0.0000581 Btc
$192,947.00
670.867 BNB
0.0001%
87
Bitstamp
BTC-USDC$1.001
0.0000581 Btc
$189,968.00
11.031 BTC
0.0000%
88
BitMart
DAI-USDC$1.001
0.0000581 Btc
$166,301.00
166,234.200 DAI
0.0219%
89
Bitget
MATIC-USDC$1.001
0.0000581 Btc
$158,354.00
173,530.500 MATIC
0.0229%
90
PancakeSwap (v2)
0X8AC76A51CC950D9822D68B83FE1AD97B32CD580D-USDT$1.004
0.0000583 Btc
$154,387.00
154,204.421 0X8AC76A51CC950D9822D68B83FE1AD97B32CD580D
0.0203%
91
CoinJar Exchange
USDC-AUD$1.003
0.0000582 Btc
$149,043.00
148,601.251 USDC
0.0196%
92
Bitget
ADA-USDC$1.001
0.0000581 Btc
$148,394.00
474,623.000 ADA
0.0625%
93
CoinEx
USDC-USDT$1.001
0.0000581 Btc
$127,436.00
127,265.068 USDC
0.0168%
94
BitMart
BUSD-USDC$1.001
0.0000581 Btc
$116,475.00
116,404.000 BUSD
0.0153%
95
Bitget
AVAX-USDC$1.001
0.0000581 Btc
$108,618.00
8,150.820 AVAX
0.0011%
96
Bitget
TRX-USDC$1.001
0.0000581 Btc
$101,803.00
1,891,380.800 TRX
0.2491%
97
MEXC Global
OP-USDC$1.001
0.0000581 Btc
$98,813.00
91,089.010 OP
0.0120%
98
Bitget
DOGE-USDC$1.001
0.0000581 Btc
$80,457.00
826,453.304 DOGE
0.1088%
99
Bittrex
USDC-USD$0.9996
0.0000580 Btc
$76,994.00
77,023.585 USDC
0.0101%
100
Bitget
EOS-USDC$1.001
0.0000581 Btc
$76,115.00
76,314.700 EOS
0.0101%

Contract Source Code Verified (Exact Match)

Contract Name:
TransparentUpgradeableProxy

Compiler Version
v0.6.12+commit.27d51765

Optimization Enabled:
Yes with 200 runs

Other Settings:
default evmVersion, None license
/**
 *Submitted for verification at Etherscan.io on 2021-09-09
*/

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.2 <0.8.0;

/**
 * @dev Collection of functions related to the address type
 */
library Address {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * [IMPORTANT]
     * ====
     * It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     *
     * Among others, `isContract` will return false for the following
     * types of addresses:
     *
     *  - an externally-owned account
     *  - a contract in construction
     *  - an address where a contract will be created
     *  - an address where a contract lived, but was destroyed
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize, which returns 0 for contracts in
        // construction, since the code is only stored at the end of the
        // constructor execution.

        uint256 size;
        // solhint-disable-next-line no-inline-assembly
        assembly { size := extcodesize(account) }
        return size > 0;
    }

    /**
     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
     * `recipient`, forwarding all available gas and reverting on errors.
     *
     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
     * of certain opcodes, possibly making contracts go over the 2300 gas limit
     * imposed by `transfer`, making them unable to receive funds via
     * `transfer`. {sendValue} removes this limitation.
     *
     * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
     *
     * IMPORTANT: because control is transferred to `recipient`, care must be
     * taken to not create reentrancy vulnerabilities. Consider using
     * {ReentrancyGuard} or the
     * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");

        // solhint-disable-next-line avoid-low-level-calls, avoid-call-value
        (bool success, ) = recipient.call{ value: amount }("");
        require(success, "Address: unable to send value, recipient may have reverted");
    }

    /**
     * @dev Performs a Solidity function call using a low level `call`. A
     * plain`call` is an unsafe replacement for a function call: use this
     * function instead.
     *
     * If `target` reverts with a revert reason, it is bubbled up by this
     * function (like regular Solidity function calls).
     *
     * Returns the raw returned data. To convert to the expected return value,
     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
     *
     * Requirements:
     *
     * - `target` must be a contract.
     * - calling `target` with `data` must not revert.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
      return functionCall(target, data, "Address: low-level call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
     * `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but also transferring `value` wei to `target`.
     *
     * Requirements:
     *
     * - the calling contract must have an ETH balance of at least `value`.
     * - the called Solidity function must be `payable`.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(address target, bytes memory data, uint256 value) internal returns (bytes memory) {
        return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
    }

    /**
     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
     * with `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(address target, bytes memory data, uint256 value, string memory errorMessage) internal returns (bytes memory) {
        require(address(this).balance >= value, "Address: insufficient balance for call");
        require(isContract(target), "Address: call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.call{ value: value }(data);
        return _verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
        return functionStaticCall(target, data, "Address: low-level static call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data, string memory errorMessage) internal view returns (bytes memory) {
        require(isContract(target), "Address: static call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.staticcall(data);
        return _verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionDelegateCall(target, data, "Address: low-level delegate call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) {
        require(isContract(target), "Address: delegate call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.delegatecall(data);
        return _verifyCallResult(success, returndata, errorMessage);
    }

    function _verifyCallResult(bool success, bytes memory returndata, string memory errorMessage) private pure returns(bytes memory) {
        if (success) {
            return returndata;
        } else {
            // Look for revert reason and bubble it up if present
            if (returndata.length > 0) {
                // The easiest way to bubble the revert reason is using memory via assembly

                // solhint-disable-next-line no-inline-assembly
                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}


/**
 * @dev This abstract contract provides a fallback function that delegates all calls to another contract using the EVM
 * instruction `delegatecall`. We refer to the second contract as the _implementation_ behind the proxy, and it has to
 * be specified by overriding the virtual {_implementation} function.
 *
 * Additionally, delegation to the implementation can be triggered manually through the {_fallback} function, or to a
 * different contract through the {_delegate} function.
 *
 * The success and return data of the delegated call will be returned back to the caller of the proxy.
 */
abstract contract Proxy {
    /**
     * @dev Delegates the current call to `implementation`.
     *
     * This function does not return to its internall call site, it will return directly to the external caller.
     */
    function _delegate(address implementation) internal virtual {
        // solhint-disable-next-line no-inline-assembly
        assembly {
            // Copy msg.data. We take full control of memory in this inline assembly
            // block because it will not return to Solidity code. We overwrite the
            // Solidity scratch pad at memory position 0.
            calldatacopy(0, 0, calldatasize())

            // Call the implementation.
            // out and outsize are 0 because we don't know the size yet.
            let result := delegatecall(gas(), implementation, 0, calldatasize(), 0, 0)

            // Copy the returned data.
            returndatacopy(0, 0, returndatasize())

            switch result
            // delegatecall returns 0 on error.
            case 0 { revert(0, returndatasize()) }
            default { return(0, returndatasize()) }
        }
    }

    /**
     * @dev This is a virtual function that should be overriden so it returns the address to which the fallback function
     * and {_fallback} should delegate.
     */
    function _implementation() internal view virtual returns (address);

    /**
     * @dev Delegates the current call to the address returned by `_implementation()`.
     *
     * This function does not return to its internall call site, it will return directly to the external caller.
     */
    function _fallback() internal virtual {
        _beforeFallback();
        _delegate(_implementation());
    }

    /**
     * @dev Fallback function that delegates calls to the address returned by `_implementation()`. Will run if no other
     * function in the contract matches the call data.
     */
    fallback () external payable virtual {
        _fallback();
    }

    /**
     * @dev Fallback function that delegates calls to the address returned by `_implementation()`. Will run if call data
     * is empty.
     */
    receive () external payable virtual {
        _fallback();
    }

    /**
     * @dev Hook that is called before falling back to the implementation. Can happen as part of a manual `_fallback`
     * call, or as part of the Solidity `fallback` or `receive` functions.
     *
     * If overriden should call `super._beforeFallback()`.
     */
    function _beforeFallback() internal virtual {
    }
}


/**
 * @dev This contract implements an upgradeable proxy. It is upgradeable because calls are delegated to an
 * implementation address that can be changed. This address is stored in storage in the location specified by
 * https://eips.ethereum.org/EIPS/eip-1967[EIP1967], so that it doesn't conflict with the storage layout of the
 * implementation behind the proxy.
 *
 * Upgradeability is only provided internally through {_upgradeTo}. For an externally upgradeable proxy see
 * {TransparentUpgradeableProxy}.
 */
contract UpgradeableProxy is Proxy {
    /**
     * @dev Initializes the upgradeable proxy with an initial implementation specified by `_logic`.
     *
     * If `_data` is nonempty, it's used as data in a delegate call to `_logic`. This will typically be an encoded
     * function call, and allows initializating the storage of the proxy like a Solidity constructor.
     */
    constructor(address _logic, bytes memory _data) public payable {
        assert(_IMPLEMENTATION_SLOT == bytes32(uint256(keccak256("eip1967.proxy.implementation")) - 1));
        _setImplementation(_logic);
        if(_data.length > 0) {
            Address.functionDelegateCall(_logic, _data);
        }
    }

    /**
     * @dev Emitted when the implementation is upgraded.
     */
    event Upgraded(address indexed implementation);

    /**
     * @dev Storage slot with the address of the current implementation.
     * This is the keccak-256 hash of "eip1967.proxy.implementation" subtracted by 1, and is
     * validated in the constructor.
     */
    bytes32 private constant _IMPLEMENTATION_SLOT = 0x360894a13ba1a3210667c828492db98dca3e2076cc3735a920a3ca505d382bbc;

    /**
     * @dev Returns the current implementation address.
     */
    function _implementation() internal view virtual override returns (address impl) {
        bytes32 slot = _IMPLEMENTATION_SLOT;
        // solhint-disable-next-line no-inline-assembly
        assembly {
            impl := sload(slot)
        }
    }

    /**
     * @dev Upgrades the proxy to a new implementation.
     *
     * Emits an {Upgraded} event.
     */
    function _upgradeTo(address newImplementation) internal virtual {
        _setImplementation(newImplementation);
        emit Upgraded(newImplementation);
    }

    /**
     * @dev Stores a new address in the EIP1967 implementation slot.
     */
    function _setImplementation(address newImplementation) private {
        require(Address.isContract(newImplementation), "UpgradeableProxy: new implementation is not a contract");

        bytes32 slot = _IMPLEMENTATION_SLOT;

        // solhint-disable-next-line no-inline-assembly
        assembly {
            sstore(slot, newImplementation)
        }
    }
}


/**
 * @dev This contract implements a proxy that is upgradeable by an admin.
 *
 * To avoid https://medium.com/nomic-labs-blog/malicious-backdoors-in-ethereum-proxies-62629adf3357[proxy selector
 * clashing], which can potentially be used in an attack, this contract uses the
 * https://blog.openzeppelin.com/the-transparent-proxy-pattern/[transparent proxy pattern]. This pattern implies two
 * things that go hand in hand:
 *
 * 1. If any account other than the admin calls the proxy, the call will be forwarded to the implementation, even if
 * that call matches one of the admin functions exposed by the proxy itself.
 * 2. If the admin calls the proxy, it can access the admin functions, but its calls will never be forwarded to the
 * implementation. If the admin tries to call a function on the implementation it will fail with an error that says
 * "admin cannot fallback to proxy target".
 *
 * These properties mean that the admin account can only be used for admin actions like upgrading the proxy or changing
 * the admin, so it's best if it's a dedicated account that is not used for anything else. This will avoid headaches due
 * to sudden errors when trying to call a function from the proxy implementation.
 *
 * Our recommendation is for the dedicated account to be an instance of the {ProxyAdmin} contract. If set up this way,
 * you should think of the `ProxyAdmin` instance as the real administrative interface of your proxy.
 */
contract TransparentUpgradeableProxy is UpgradeableProxy {
    /**
     * @dev Initializes an upgradeable proxy managed by `_admin`, backed by the implementation at `_logic`, and
     * optionally initialized with `_data` as explained in {UpgradeableProxy-constructor}.
     */
    constructor(address _logic, address admin_, bytes memory _data) public payable UpgradeableProxy(_logic, _data) {
        assert(_ADMIN_SLOT == bytes32(uint256(keccak256("eip1967.proxy.admin")) - 1));
        _setAdmin(admin_);
    }

    /**
     * @dev Emitted when the admin account has changed.
     */
    event AdminChanged(address previousAdmin, address newAdmin);

    /**
     * @dev Storage slot with the admin of the contract.
     * This is the keccak-256 hash of "eip1967.proxy.admin" subtracted by 1, and is
     * validated in the constructor.
     */
    bytes32 private constant _ADMIN_SLOT = 0xb53127684a568b3173ae13b9f8a6016e243e63b6e8ee1178d6a717850b5d6103;

    /**
     * @dev Modifier used internally that will delegate the call to the implementation unless the sender is the admin.
     */
    modifier ifAdmin() {
        if (msg.sender == _admin()) {
            _;
        } else {
            _fallback();
        }
    }

    /**
     * @dev Returns the current admin.
     *
     * NOTE: Only the admin can call this function. See {ProxyAdmin-getProxyAdmin}.
     *
     * TIP: To get this value clients can read directly from the storage slot shown below (specified by EIP1967) using the
     * https://eth.wiki/json-rpc/API#eth_getstorageat[`eth_getStorageAt`] RPC call.
     * `0xb53127684a568b3173ae13b9f8a6016e243e63b6e8ee1178d6a717850b5d6103`
     */
    function admin() external ifAdmin returns (address admin_) {
        admin_ = _admin();
    }

    /**
     * @dev Returns the current implementation.
     *
     * NOTE: Only the admin can call this function. See {ProxyAdmin-getProxyImplementation}.
     *
     * TIP: To get this value clients can read directly from the storage slot shown below (specified by EIP1967) using the
     * https://eth.wiki/json-rpc/API#eth_getstorageat[`eth_getStorageAt`] RPC call.
     * `0x360894a13ba1a3210667c828492db98dca3e2076cc3735a920a3ca505d382bbc`
     */
    function implementation() external ifAdmin returns (address implementation_) {
        implementation_ = _implementation();
    }

    /**
     * @dev Changes the admin of the proxy.
     *
     * Emits an {AdminChanged} event.
     *
     * NOTE: Only the admin can call this function. See {ProxyAdmin-changeProxyAdmin}.
     */
    function changeAdmin(address newAdmin) external virtual ifAdmin {
        require(newAdmin != address(0), "TransparentUpgradeableProxy: new admin is the zero address");
        emit AdminChanged(_admin(), newAdmin);
        _setAdmin(newAdmin);
    }

    /**
     * @dev Upgrade the implementation of the proxy.
     *
     * NOTE: Only the admin can call this function. See {ProxyAdmin-upgrade}.
     */
    function upgradeTo(address newImplementation) external virtual ifAdmin {
        _upgradeTo(newImplementation);
    }

    /**
     * @dev Upgrade the implementation of the proxy, and then call a function from the new implementation as specified
     * by `data`, which should be an encoded function call. This is useful to initialize new storage variables in the
     * proxied contract.
     *
     * NOTE: Only the admin can call this function. See {ProxyAdmin-upgradeAndCall}.
     */
    function upgradeToAndCall(address newImplementation, bytes calldata data) external payable virtual ifAdmin {
        _upgradeTo(newImplementation);
        Address.functionDelegateCall(newImplementation, data);
    }

    /**
     * @dev Returns the current admin.
     */
    function _admin() internal view virtual returns (address adm) {
        bytes32 slot = _ADMIN_SLOT;
        // solhint-disable-next-line no-inline-assembly
        assembly {
            adm := sload(slot)
        }
    }

    /**
     * @dev Stores a new address in the EIP1967 admin slot.
     */
    function _setAdmin(address newAdmin) private {
        bytes32 slot = _ADMIN_SLOT;

        // solhint-disable-next-line no-inline-assembly
        assembly {
            sstore(slot, newAdmin)
        }
    }

    /**
     * @dev Makes sure the admin cannot access the fallback function. See {Proxy-_beforeFallback}.
     */
    function _beforeFallback() internal virtual override {
        require(msg.sender != _admin(), "TransparentUpgradeableProxy: admin cannot fallback to proxy target");
        super._beforeFallback();
    }
}

Contract Security Audit

Contract ABI

[{"inputs": [{"internalType": "address","name": "_logic","type": "address"},{"internalType": "address","name": "admin_","type": "address"},{"internalType": "bytes","name": "_data","type": "bytes"}],"stateMutability": "payable","type": "constructor"},{"anonymous": false,"inputs": [{"indexed": false,"internalType": "address","name": "previousAdmin","type": "address"},{"indexed": false,"internalType": "address","name": "newAdmin","type": "address"}],"name": "AdminChanged","type": "event"},{"anonymous": false,"inputs": [{"indexed": true,"internalType": "address","name": "implementation","type": "address"}],"name": "Upgraded","type": "event"},{"stateMutability": "payable","type": "fallback"},{"inputs": [],"name": "admin","outputs": [{"internalType": "address","name": "admin_","type": "address"}],"stateMutability": "nonpayable","type": "function"},{"inputs": [{"internalType": "address","name": "newAdmin","type": "address"}],"name": "changeAdmin","outputs": [],"stateMutability": "nonpayable","type": "function"},{"inputs": [],"name": "implementation","outputs": [{"internalType": "address","name": "implementation_","type": "address"}],"stateMutability": "nonpayable","type": "function"},{"inputs": [{"internalType": "address","name": "newImplementation","type": "address"}],"name": "upgradeTo","outputs": [],"stateMutability": "nonpayable","type": "function"},{"inputs": [{"internalType": "address","name": "newImplementation","type": "address"},{"internalType": "bytes","name": "data","type": "bytes"}],"name": "upgradeToAndCall","outputs": [],"stateMutability": "payable","type": "function"},{"stateMutability": "payable","type": "receive"}]

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Constructor Arguments (ABI-Encoded and is the last bytes of the Contract Creation Code above)

0000000000000000000000001efb3f88bc88f03fd1804a5c53b7141bbef5ded8000000000000000000000000d570ace65c43af47101fc6250fd6fc63d1c22a86000000000000000000000000000000000000000000000000000000000000006000000000000000000000000000000000000000000000000000000000000000000000

-----Decoded View---------------
Arg [0] : _logic (address): 0x1efb3f88bc88f03fd1804a5c53b7141bbef5ded8
Arg [1] : admin_ (address): 0xd570ace65c43af47101fc6250fd6fc63d1c22a86
Arg [2] : _data (bytes): 0x

-----Encoded View---------------


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