Token USD Coin (Arb1)

 

Overview ERC20

Price
$1.00 @ 0.000791 ETH (-0.04%)
Fully Diluted Market Cap
Total Supply:
630,625,395.488161 USDC

Holders:
245,012 addresses
Balance
0 USDC

Value
$0.00
0xb7b0e9d6e2d182ab370fd1c020c536af6b9cbfd6
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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):$1,840,746,430.00
Market Capitalization:$43,149,399,407.00
Circulating Supply:43,156,321,998.00 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$1.003
0.0000588 Btc
$258,205,988.00
260,415,421.384 0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48
0.0915%
2
MEXC Global
ETH-USDC$1.001
0.0000586 Btc
$154,695,881.00
122,140.615 ETH
0.0000%
3
MEXC Global
BTC-USDC$1.001
0.0000586 Btc
$124,365,587.00
7,284.100 BTC
0.0000%
4
LBank
ETH-USDC$1.001
0.0000586 Btc
$114,689,968.00
90,562.408 ETH
0.0000%
5
Kraken
USDC-USDT$1.00
0.0000586 Btc
$92,956,049.00
92,940,321.839 USDC
0.0327%
6
Bitforex
USDC-USDT$1.00
0.0000586 Btc
$82,013,625.00
81,976,602.790 USDC
0.0288%
7
Uniswap (v3)
0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48-0XDAC17F958D2EE523A2206206994597C13D831EC7$1.003
0.0000588 Btc
$68,541,093.00
68,331,554.549 0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48
0.0240%
8
Bitforex
BTC-USDC$1.00
0.0000586 Btc
$66,495,483.00
3,896.186 BTC
0.0000%
9
LBank
BTC-USDC$1.001
0.0000586 Btc
$40,992,346.00
2,401.337 BTC
0.0000%
10
Kraken
USDC-USD$1.00
0.0000586 Btc
$40,490,988.00
40,490,987.715 USDC
0.0142%
11
Uniswap (Arbitrum One)
0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1-0XFF970A61A04B1CA14834A43F5DE4533EBDDB5CC8$0.9996
0.0000586 Btc
$27,151,915.00
21,277.998 0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1
0.0000%
12
Kraken
USDC-EUR$1.00
0.0000586 Btc
$24,991,007.00
24,985,911.195 USDC
0.0088%
13
BKEX
BTC-USDC$1.00
0.0000586 Btc
$19,078,482.00
1,108.163 BTC
0.0000%
14
Uniswap (v3)
0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2$1.003
0.0000588 Btc
$18,106,726.00
18,212,563.707 0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48
0.0064%
15
WhiteBIT
BTC-USDC$1.00
0.0000586 Btc
$17,716,031.00
1,038.349 BTC
0.0000%
16
Bybit
ETH-USDC$1.001
0.0000586 Btc
$16,318,095.00
12,885.937 ETH
0.0000%
17
BingX
BTC-USDC$0.9998
0.0000586 Btc
$16,171,705.00
942.164 BTC
0.0000%
18
Bybit
BTC-USDC$1.001
0.0000586 Btc
$15,849,737.00
928.709 BTC
0.0000%
19
P2B
USDC-BUSD$1.00
0.0000586 Btc
$14,662,570.00
14,657,854.500 USDC
0.0052%
20
P2B
USDC-USDT$1.001
0.0000586 Btc
$14,618,062.00
14,610,080.000 USDC
0.0051%
21
Uniswap (v2)
0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2$1.00
0.0000586 Btc
$13,931,338.00
15,437,235.287 0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48
0.0054%
22
Bybit
USDC-USDT$1.001
0.0000586 Btc
$13,461,067.00
13,453,716.190 USDC
0.0047%
23
BKEX
ETH-USDC$1.00
0.0000586 Btc
$12,633,355.00
9,842.088 ETH
0.0000%
24
OKX
USDC-USDT$1.00
0.0000586 Btc
$12,546,776.00
12,545,164.063 USDC
0.0044%
25
OKX
BTC-USDC$0.9998
0.0000586 Btc
$10,353,410.00
601.663 BTC
0.0000%
26
MEXC Global
DOGE-USDC$0.9998
0.0000586 Btc
$10,004,580.00
97,672,375.120 DOGE
0.0343%
27
Huobi
USDC-USDT$1.00
0.0000586 Btc
$9,942,417.00
9,941,232.627 USDC
0.0035%
28
OKX
ETH-USDC$0.9998
0.0000586 Btc
$8,972,327.00
6,992.514 ETH
0.0000%
29
BKEX
USDC-USDT$1.00
0.0000586 Btc
$7,919,055.00
7,916,685.980 USDC
0.0028%
30
DigiFinex
USDC-USDT$1.001
0.0000586 Btc
$7,718,587.00
7,713,600.742 USDC
0.0027%
31
Uniswap (v3)
0X6B175474E89094C44DA98B954EEDEAC495271D0F-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48$1.003
0.0000588 Btc
$7,540,092.00
7,516,214.421 0X6B175474E89094C44DA98B954EEDEAC495271D0F
0.0026%
32
DigiFinex
BTC-USDC$1.001
0.0000586 Btc
$6,735,097.00
394.671 BTC
0.0000%
33
DigiFinex
ETH-USDC$1.001
0.0000586 Btc
$6,380,927.00
5,038.320 ETH
0.0000%
34
BingX
ETH-USDC$0.9998
0.0000586 Btc
$5,973,428.00
4,671.748 ETH
0.0000%
35
KuCoin
BTC-USDC$0.9999
0.0000586 Btc
$5,951,849.00
349.016 BTC
0.0000%
36
KuCoin
USDC-USDT$1.00
0.0000586 Btc
$5,577,446.00
5,576,523.138 USDC
0.0020%
37
XT.COM
USDC-USDT$1.00
0.0000586 Btc
$5,022,002.00
5,021,130.530 USDC
0.0018%
38
Uniswap (v3)
0X2260FAC5E5542A773AA44FBCFEDF7C193BC2C599-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48$1.003
0.0000588 Btc
$4,929,158.00
285.591 0X2260FAC5E5542A773AA44FBCFEDF7C193BC2C599
0.0000%
39
Gemini
USDC-USD$0.9996
0.0000586 Btc
$4,126,946.00
4,128,597.541 USDC
0.0015%
40
KuCoin
USDT-USDC$0.9999
0.0000586 Btc
$3,154,434.00
3,154,288.052 USDT
0.0011%
41
Kraken
BTC-USDC$0.9998
0.0000586 Btc
$3,024,998.00
177.401 BTC
0.0000%
42
Kraken
USDC-GBP$1.00
0.0000586 Btc
$2,807,264.00
2,807,242.962 USDC
0.0010%
43
MEXC Global
SHIB-USDC$0.9998
0.0000586 Btc
$2,675,230.00
283,746,645,907.000 SHIB
99.7002%
44
BitMart
ETH-USDC$1.00
0.0000586 Btc
$2,604,726.00
2,058.395 ETH
0.0000%
45
Sushiswap (Arbitrum One)
0XFF970A61A04B1CA14834A43F5DE4533EBDDB5CC8-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1$0.9999
0.0000586 Btc
$2,418,180.00
2,443,464.816 0XFF970A61A04B1CA14834A43F5DE4533EBDDB5CC8
0.0009%
46
Bitget
BTC-USDC$1.00
0.0000586 Btc
$2,252,093.00
131.273 BTC
0.0000%
47
MEXC Global
LTC-USDC$1.001
0.0000586 Btc
$2,208,685.00
27,238.280 LTC
0.0000%
48
MEXC Global
BCH-USDC$1.001
0.0000586 Btc
$2,171,245.00
19,527.470 BCH
0.0000%
49
Sushiswap
0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2$0.9977
0.0000585 Btc
$1,963,122.00
1,984,327.598 0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48
0.0007%
50
MEXC Global
XRP-USDC$1.001
0.0000586 Btc
$1,942,165.00
4,997,565.360 XRP
0.0018%
51
MEXC Global
SOL-USDC$1.001
0.0000586 Btc
$1,594,665.00
114,159.850 SOL
0.0000%
52
MEXC Global
EOS-USDC$1.001
0.0000586 Btc
$1,538,608.00
1,644,896.370 EOS
0.0006%
53
Binance US
USDC-USD$1.00
0.0000586 Btc
$1,492,653.00
1,492,652.644 USDC
0.0005%
54
Hotbit
USDC-USDT$0.9994
0.0000586 Btc
$1,478,718.00
1,479,537.540 USDC
0.0005%
55
MEXC Global
AVAX-USDC$1.001
0.0000586 Btc
$1,313,660.00
96,214.090 AVAX
0.0000%
56
Kraken
ETH-USDC$0.9998
0.0000586 Btc
$1,312,227.00
1,037.109 ETH
0.0000%
57
WhiteBIT
ETH-USDC$1.00
0.0000586 Btc
$1,205,007.00
951.667 ETH
0.0000%
58
ZigZag (Arbitrum)
WETH-USDC$0.9998
0.0000586 Btc
$1,201,185.00
942.666 WETH
0.0000%
59
Bitget
USDC-USDT$1.00
0.0000586 Btc
$998,745.00
998,525.326 USDC
0.0004%
60
LBank
USDC-USDT$1.00
0.0000586 Btc
$989,996.00
989,746.101 USDC
0.0003%
61
Maiar
WEGLD-BD4D79-USDC-C76F1F$1.003
0.0000588 Btc
$861,303.00
19,798.272 WEGLD-BD4D79
0.0000%
62
Bitstamp
USDC-EUR$0.999
0.0000586 Btc
$858,978.00
859,814.911 USDC
0.0003%
63
Bitstamp
USDC-USD$0.9998
0.0000586 Btc
$831,823.00
831,989.149 USDC
0.0003%
64
Tidex
BTC-USDC$0.9999
0.0000586 Btc
$823,161.00
48.249 BTC
0.0000%
65
Bitget
ETH-USDC$1.00
0.0000586 Btc
$799,507.00
624.128 ETH
0.0000%
66
VVS Finance
0X66E428C3F67A68878562E79A0234C1F83C208770-0XC21223249CA28397B4B6541DFFAECC539BFF0C59$0.9913
0.0000581 Btc
$771,724.00
781,716.960 0X66E428C3F67A68878562E79A0234C1F83C208770
0.0003%
67
Uniswap (v3)
0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2$1.003
0.0000588 Btc
$708,666.00
594,233.396 0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48
0.0002%
68
Bitget
XRP-USDC$1.00
0.0000586 Btc
$695,856.00
1,782,188.000 XRP
0.0006%
69
MEXC Global
TRX-USDC$1.001
0.0000586 Btc
$685,379.00
12,839,313.750 TRX
0.0045%
70
MEXC Global
FTM-USDC$1.001
0.0000586 Btc
$571,522.00
2,209,615.370 FTM
0.0008%
71
Coinbase Exchange
USDC-EUR$1.00
0.0000586 Btc
$562,833.00
562,718.620 USDC
0.0002%
72
PancakeSwap (v2)
0X2170ED0880AC9A755FD29B2688956BD959F933F8-0X8AC76A51CC950D9822D68B83FE1AD97B32CD580D$0.9984
0.0000585 Btc
$551,821.00
433.562 0X2170ED0880AC9A755FD29B2688956BD959F933F8
0.0000%
73
PancakeSwap (v2)
0X8AC76A51CC950D9822D68B83FE1AD97B32CD580D-BUSD$0.9982
0.0000585 Btc
$538,014.00
537,498.537 0X8AC76A51CC950D9822D68B83FE1AD97B32CD580D
0.0002%
74
BitMart
USDC-USDT$1.00
0.0000586 Btc
$526,979.00
526,916.260 USDC
0.0002%
75
PancakeSwap (v2)
0X8AC76A51CC950D9822D68B83FE1AD97B32CD580D-USDT$0.9981
0.0000585 Btc
$388,693.00
388,701.545 0X8AC76A51CC950D9822D68B83FE1AD97B32CD580D
0.0001%
76
Coinzoom
USDC-USD$1.001
0.0000587 Btc
$328,526.00
328,197.860 USDC
0.0001%
77
Okcoin
USDC-USD$1.00
0.0000586 Btc
$305,721.00
305,689.956 USDC
0.0001%
78
Coinfield
BTC-USDC$1.00
0.0000586 Btc
$285,229.00
16.712 BTC
0.0000%
79
Bitget
BCH-USDC$1.00
0.0000586 Btc
$280,923.00
2,479.722 BCH
0.0000%
80
Coinbase Exchange
USDT-USDC$1.00
0.0000586 Btc
$262,598.00
262,511.950 USDT
0.0001%
81
BKEX
APE-USDC$1.00
0.0000586 Btc
$237,990.00
58,035.999 APE
0.0000%
82
CoinEx
USDC-USDT$1.001
0.0000587 Btc
$220,931.00
220,665.661 USDC
0.0001%
83
Bitget
BNB-USDC$1.00
0.0000586 Btc
$197,078.00
673.794 BNB
0.0000%
84
Phemex
USDC-USDT$1.00
0.0000586 Btc
$184,708.00
184,642.830 USDC
0.0001%
85
Bitget
ADA-USDC$1.00
0.0000586 Btc
$181,555.00
561,624.000 ADA
0.0002%
86
Bitfinex
UDC-USDT$1.001
0.0000586 Btc
$176,947.00
176,853.022 UDC
0.0001%
87
Bitstamp
BTC-USDC$0.9998
0.0000586 Btc
$157,112.00
9.204 BTC
0.0000%
88
KuCoin
BUSD-USDC$1.00
0.0000586 Btc
$153,359.00
153,354.563 BUSD
0.0001%
89
BitMart
DAI-USDC$1.001
0.0000586 Btc
$134,398.00
134,302.400 DAI
0.0000%
90
Bitget
MATIC-USDC$1.00
0.0000586 Btc
$126,127.00
136,432.900 MATIC
0.0000%
91
BKEX
ATOM-USDC$1.00
0.0000586 Btc
$120,749.00
11,619.007 ATOM
0.0000%
92
Bittrex
USDC-USD$1.00
0.0000586 Btc
$108,804.00
108,802.668 USDC
0.0000%
93
BKEX
SOL-USDC$1.00
0.0000586 Btc
$98,738.00
7,100.519 SOL
0.0000%
94
Coinsbit
USDC-USDT$1.00
0.0000586 Btc
$92,950.00
92,927.557 USDC
0.0000%
95
Coinbase Exchange
USDC-GBP$0.9996
0.0000586 Btc
$92,538.00
92,570.840 USDC
0.0000%
96
Bitget
TRX-USDC$1.00
0.0000586 Btc
$83,634.00
1,566,583.000 TRX
0.0006%
97
Bitget
AVAX-USDC$1.00
0.0000586 Btc
$82,158.00
5,899.130 AVAX
0.0000%
98
Bitget
DOGE-USDC$1.00
0.0000586 Btc
$77,398.00
747,324.358 DOGE
0.0003%
99
CoinJar Exchange
USDC-AUD$0.9996
0.0000586 Btc
$74,750.00
74,782.580 USDC
0.0000%
100
BKEX
NEAR-USDC$1.00
0.0000586 Btc
$62,664.00
35,942.163 NEAR
0.0000%

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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