Token USD Coin (Arb1)

 

Overview ERC20

Price
$1.00 @ 0.000609 ETH (+0.01%)
Fully Diluted Market Cap
Total Supply:
631,890,771.164163 USDC

Holders:
288,137 addresses
Balance
0 USDC

Value
$0.00
0x441e1e47a6fa2dbfd3cd9b54291e9ab3a58d7975
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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):$2,958,214,372.00
Market Capitalization:$43,088,175,652.00
Circulating Supply:43,086,035,207.00 USDC
Market Data Source: Coinmarketcap


Update? Click here to update the token ICO / general information
# Exchange Pair Price  24H Volume % Volume
1
LBank
ETH-USDC$1.00
0.0000420 Btc
$429,268,427.00
261,592.446 ETH
0.0001%
2
Uniswap (v3)
0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2$0.9998
0.0000420 Btc
$353,285,040.00
345,364,038.320 0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48
0.0962%
3
LBank
BTC-USDC$1.00
0.0000420 Btc
$127,457,269.00
5,353.461 BTC
0.0000%
4
Uniswap (v3)
0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48-0XDAC17F958D2EE523A2206206994597C13D831EC7$0.9998
0.0000420 Btc
$121,377,945.00
121,418,143.950 0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48
0.0338%
5
Bitforex
BTC-USDC$1.00
0.0000420 Btc
$110,569,928.00
4,645.386 BTC
0.0000%
6
Bitforex
USDC-USDT$0.9999
0.0000420 Btc
$108,068,702.00
108,080,767.703 USDC
0.0301%
7
Uniswap (v3)
0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2$0.9998
0.0000420 Btc
$83,051,158.00
80,733,889.334 0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48
0.0225%
8
BitMart
ETH-USDC$0.9998
0.0000420 Btc
$72,853,391.00
44,280.821 ETH
0.0000%
9
Uniswap (Arbitrum One)
0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1-0XFF970A61A04B1CA14834A43F5DE4533EBDDB5CC8$1.001
0.0000420 Btc
$65,081,119.00
40,382.991 0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1
0.0000%
10
ApeX Pro
BTC-USDC$0.9998
0.0000420 Btc
$63,172,287.00
2,679.740 BTC
0.0000%
11
OKX
ETH-USDC$0.9998
0.0000420 Btc
$34,164,547.00
21,210.103 ETH
0.0000%
12
BKEX
ETH-USDC$1.00
0.0000420 Btc
$32,916,361.00
20,432.111 ETH
0.0000%
13
ApeX Pro
ETH-USDC$0.9998
0.0000420 Btc
$32,749,311.00
20,328.030 ETH
0.0000%
14
BitMart
BTC-USDC$0.9998
0.0000420 Btc
$32,139,635.00
1,351.383 BTC
0.0000%
15
Bitforex
LTC-USDC$1.00
0.0000420 Btc
$31,773,693.00
328,004.970 LTC
0.0001%
16
Uniswap (v3)
0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2$0.9998
0.0000420 Btc
$27,292,214.00
26,741,656.144 0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48
0.0075%
17
Huobi
USDC-USDT$1.00
0.0000420 Btc
$20,684,300.00
20,683,458.310 USDC
0.0058%
18
WhiteBIT
USDC-USDT$1.00
0.0000420 Btc
$19,784,553.00
19,784,782.160 USDC
0.0055%
19
Canto Dex
0X4E71A2E537B7F9D9413D3991D37958C0B5E1E503-0X80B5A32E4F032B2A058B4F29EC95EEFEEB87ADCD$1.00
0.0000420 Btc
$19,552,027.00
18,892,680.200 0X4E71A2E537B7F9D9413D3991D37958C0B5E1E503
0.0053%
20
LBank
USDC-USDT$1.00
0.0000420 Btc
$17,340,707.00
17,339,173.351 USDC
0.0048%
21
OKX
BTC-USDC$0.9998
0.0000420 Btc
$16,165,430.00
689.975 BTC
0.0000%
22
BKEX
BTC-USDC$0.9999
0.0000420 Btc
$15,967,708.00
681.437 BTC
0.0000%
23
BingX
BTC-USDC$0.9998
0.0000420 Btc
$15,714,342.00
670.566 BTC
0.0000%
24
MEXC Global
BTC-USDC$0.9999
0.0000420 Btc
$14,419,832.00
605.979 BTC
0.0000%
25
BingX
ETH-USDC$0.9998
0.0000420 Btc
$13,802,848.00
8,562.932 ETH
0.0000%
26
DigiFinex
BTC-USDC$1.00
0.0000420 Btc
$13,089,948.00
549.980 BTC
0.0000%
27
DigiFinex
ETH-USDC$1.00
0.0000420 Btc
$12,581,919.00
7,651.380 ETH
0.0000%
28
Bybit
BTC-USDC$0.9998
0.0000420 Btc
$12,056,073.00
506.803 BTC
0.0000%
29
KuCoin
BTC-USDC$1.00
0.0000420 Btc
$9,076,982.00
381.332 BTC
0.0000%
30
OKX
USDC-USDT$1.00
0.0000420 Btc
$9,034,710.00
9,034,047.214 USDC
0.0025%
31
KuCoin
USDC-USDT$1.00
0.0000420 Btc
$8,784,347.00
8,782,604.445 USDC
0.0024%
32
KuCoin
ETH-USDC$1.00
0.0000420 Btc
$8,036,290.00
4,884.613 ETH
0.0000%
33
MEXC Global
ETH-USDC$0.9999
0.0000420 Btc
$7,435,171.00
4,522.529 ETH
0.0000%
34
DigiFinex
USDC-USDT$1.00
0.0000420 Btc
$7,310,117.00
7,310,217.105 USDC
0.0020%
35
Kraken
USDC-USDT$1.00
0.0000420 Btc
$6,950,049.00
6,948,739.041 USDC
0.0019%
36
Uniswap (v2)
0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2$1.001
0.0000421 Btc
$5,674,332.00
5,552,882.390 0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48
0.0015%
37
Bitrue
USDC-USDT$1.00
0.0000420 Btc
$5,068,233.00
5,066,888.030 USDC
0.0014%
38
Kraken
USDC-USD$1.00
0.0000420 Btc
$4,720,907.00
4,720,907.385 USDC
0.0013%
39
Bybit
USDC-USDT$1.00
0.0000420 Btc
$4,533,363.00
4,532,825.820 USDC
0.0013%
40
BingX
USDC-USDT$0.999
0.0000420 Btc
$4,416,099.00
4,417,172.459 USDC
0.0012%
41
BKEX
USDC-USDT$1.00
0.0000420 Btc
$4,346,533.00
4,345,874.832 USDC
0.0012%
42
LBank
SHIB-USDC$1.00
0.0000420 Btc
$4,324,249.00
358,018,297,817.015 SHIB
99.7584%
43
Uniswap (v3)
0X6B175474E89094C44DA98B954EEDEAC495271D0F-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48$0.9998
0.0000420 Btc
$4,025,941.00
4,026,564.428 0X6B175474E89094C44DA98B954EEDEAC495271D0F
0.0011%
44
KuCoin
USDT-USDC$1.00
0.0000420 Btc
$3,717,370.00
3,716,223.478 USDT
0.0010%
45
Kraken
USDC-EUR$0.9997
0.0000420 Btc
$3,338,463.00
3,339,504.262 USDC
0.0009%
46
Kraken
BTC-USDC$0.9998
0.0000420 Btc
$2,303,422.00
96.771 BTC
0.0000%
47
Sushiswap
0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2$1.002
0.0000421 Btc
$2,160,443.00
2,122,645.808 0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48
0.0006%
48
Kraken
ETH-USDC$0.9998
0.0000420 Btc
$2,003,181.00
1,217.762 ETH
0.0000%
49
Bitget
BTC-USDC$0.9999
0.0000420 Btc
$2,001,637.00
85.632 BTC
0.0000%
50
Cryptology
BTC-USDC$1.00
0.0000420 Btc
$1,927,759.00
80.990 BTC
0.0000%
51
Uniswap (v3)
0X2260FAC5E5542A773AA44FBCFEDF7C193BC2C599-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48$1.002
0.0000421 Btc
$1,769,913.00
75.520 0X2260FAC5E5542A773AA44FBCFEDF7C193BC2C599
0.0000%
52
Tidex
BTC-USDC$0.9998
0.0000420 Btc
$1,440,447.00
60.534 BTC
0.0000%
53
LBank
NEAR-USDC$1.00
0.0000420 Btc
$1,403,110.00
542,372.610 NEAR
0.0002%
54
Bitget
ETH-USDC$0.9999
0.0000420 Btc
$1,149,083.00
714.964 ETH
0.0000%
55
Binance US
USDC-USD$0.9998
0.0000420 Btc
$1,134,418.00
1,134,645.426 USDC
0.0003%
56
WhiteBIT
BTC-USDC$1.00
0.0000420 Btc
$876,672.00
36.815 BTC
0.0000%
57
Kraken
USDC-GBP$0.9997
0.0000420 Btc
$869,225.00
869,523.632 USDC
0.0002%
58
LBank
FTM-USDC$1.00
0.0000420 Btc
$868,533.00
1,762,986.310 FTM
0.0005%
59
LBank
EOS-USDC$1.00
0.0000420 Btc
$852,702.00
766,605.300 EOS
0.0002%
60
MEXC Global
BCH-USDC$0.9999
0.0000420 Btc
$838,610.00
6,105.610 BCH
0.0000%
61
Bibox
ETH-USDC$0.9998
0.0000420 Btc
$837,751.00
510.000 ETH
0.0000%
62
MEXC Global
DOGE-USDC$0.9999
0.0000420 Btc
$798,687.00
8,873,273.530 DOGE
0.0025%
63
Coinfield
BTC-USDC$0.9997
0.0000420 Btc
$755,635.00
31.751 BTC
0.0000%
64
BingX
DOGE-USDC$0.9998
0.0000420 Btc
$743,246.00
8,312,097.599 DOGE
0.0023%
65
MEXC Global
LTC-USDC$0.9999
0.0000420 Btc
$672,620.00
6,950.610 LTC
0.0000%
66
Bitfinex
UDC-USD$1.00
0.0000420 Btc
$562,443.00
562,386.989 UDC
0.0002%
67
MEXC Global
MATIC-USDC$0.9999
0.0000420 Btc
$555,270.00
474,056.770 MATIC
0.0001%
68
Hotbit
USDC-USDT$1.00
0.0000420 Btc
$541,454.00
541,434.050 USDC
0.0002%
69
BitMart
USDC-USDT$1.00
0.0000420 Btc
$540,792.00
540,646.720 USDC
0.0002%
70
BKEX
ATOM-USDC$1.00
0.0000420 Btc
$530,905.00
39,351.706 ATOM
0.0000%
71
Gemini
USDC-USD$0.9997
0.0000420 Btc
$513,451.00
513,599.820 USDC
0.0001%
72
Coinbase Exchange
USDT-USDC$1.00
0.0000420 Btc
$431,958.00
431,862.420 USDT
0.0001%
73
MEXC Global
FTM-USDC$0.9999
0.0000420 Btc
$413,492.00
837,311.870 FTM
0.0002%
74
Bitget
BCH-USDC$0.9999
0.0000420 Btc
$367,477.00
2,700.221 BCH
0.0000%
75
Velodrome Finance
0X8C6F28F2F1A3C87F0F938B96D27520D9751EC8D9-0X7F5C764CBC14F9669B88837CA1490CCA17C31607$1.001
0.0000420 Btc
$358,842.00
358,200.314 0X8C6F28F2F1A3C87F0F938B96D27520D9751EC8D9
0.0001%
76
BKEX
MATIC-USDC$1.00
0.0000420 Btc
$339,327.00
291,930.735 MATIC
0.0001%
77
MEXC Global
EOS-USDC$0.9999
0.0000420 Btc
$312,183.00
280,955.960 EOS
0.0001%
78
Binance US
USDC-USDT$1.00
0.0000420 Btc
$304,347.00
304,331.971 USDC
0.0001%
79
PancakeSwap (v2)
0X8AC76A51CC950D9822D68B83FE1AD97B32CD580D-BUSD$1.002
0.0000421 Btc
$271,860.00
271,356.469 0X8AC76A51CC950D9822D68B83FE1AD97B32CD580D
0.0001%
80
BingX
UNI-USDC$0.9998
0.0000420 Btc
$266,696.00
38,993.953 UNI
0.0000%
81
Phemex
USDC-USDT$1.00
0.0000420 Btc
$234,946.00
234,887.650 USDC
0.0001%
82
Coinbase Exchange
USDC-EUR$1.00
0.0000420 Btc
$212,639.00
212,634.580 USDC
0.0001%
83
Bitget
BNB-USDC$0.9999
0.0000420 Btc
$212,280.00
679.315 BNB
0.0000%
84
Bitstamp
USDC-EUR$0.999
0.0000420 Btc
$202,715.00
202,919.366 USDC
0.0001%
85
MEXC Global
ALGO-USDC$0.9999
0.0000420 Btc
$194,870.00
745,874.720 ALGO
0.0002%
86
Bitget
ADA-USDC$0.9999
0.0000420 Btc
$165,474.00
426,443.000 ADA
0.0001%
87
BitMart
LST-USDC$0.9998
0.0000420 Btc
$160,508.00
211,515.080 LST
0.0001%
88
Bittrex
USDC-USD$1.00
0.0000420 Btc
$155,340.00
155,339.836 USDC
0.0000%
89
CoinEx
USDC-USDT$1.001
0.0000420 Btc
$154,734.00
154,637.901 USDC
0.0000%
90
Bitget
AVAX-USDC$0.9999
0.0000420 Btc
$133,977.00
6,492.690 AVAX
0.0000%
91
Orderly Network
NEAR-USDC$0.9998
0.0000420 Btc
$129,390.00
56,335.260 NEAR
0.0000%
92
Bitget
TRX-USDC$0.9999
0.0000420 Btc
$116,485.00
1,836,758.600 TRX
0.0005%
93
BitMart
DAI-USDC$0.9998
0.0000420 Btc
$114,684.00
114,728.400 DAI
0.0000%
94
Coinbase Exchange
USDC-GBP$0.999
0.0000420 Btc
$93,812.00
93,909.790 USDC
0.0000%
95
Bitstamp
BTC-USDC$0.9998
0.0000420 Btc
$79,067.00
3.347 BTC
0.0000%
96
Orderly Network
WBTC-USDC$0.9998
0.0000420 Btc
$76,184.00
3.720 WBTC
0.0000%
97
KuCoin
BUSD-USDC$0.9998
0.0000420 Btc
$74,719.00
74,749.399 BUSD
0.0000%
98
Bitget
DOGE-USDC$0.9999
0.0000420 Btc
$72,371.00
812,216.086 DOGE
0.0002%
99
Coinsbit
USDC-USDT$1.00
0.0000420 Btc
$66,460.00
66,461.321 USDC
0.0000%
100
Bitstamp
USDC-USD$1.001
0.0000420 Btc
$48,664.00
48,635.809 USDC
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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