Token USD Coin (Arb1)

 

Overview ERC20

Price
$1.00 @ 0.000781 ETH (-0.18%)
Fully Diluted Market Cap
Total Supply:
629,201,140.152222 USDC

Holders:
249,960 addresses
Filtered by Token Holder (Stargate Finance: S*USDC Token)

Balance
13,956,581.822666 USDC

Value
$13,945,751.52 ( ~10,901.4208 ETH) [2.2181%]
0x892785f33cdee22a30aef750f285e18c18040c3e
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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):$1,959,792,953.00
Market Capitalization:$42,742,510,522.00
Circulating Supply:42,777,332,650.00 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$0.9956
0.0000578 Btc
$264,757,117.00
262,298,998.628 0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48
34.8474%
2
LBank
ETH-USDC$1.00
0.0000581 Btc
$130,287,574.00
101,766.697 ETH
0.0135%
3
Uniswap (v3)
0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48-0XDAC17F958D2EE523A2206206994597C13D831EC7$0.9956
0.0000578 Btc
$123,310,452.00
123,866,805.666 0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48
16.4562%
4
MEXC Global
ETH-USDC$0.9998
0.0000581 Btc
$117,231,987.00
91,547.093 ETH
0.0122%
5
Bitforex
USDC-USDT$0.9999
0.0000581 Btc
$99,264,168.00
99,273,058.173 USDC
13.1888%
6
MEXC Global
BTC-USDC$0.9998
0.0000581 Btc
$84,298,781.00
4,898.329 BTC
0.0007%
7
Bitforex
BTC-USDC$0.9998
0.0000581 Btc
$78,268,822.00
4,547.311 BTC
0.0006%
8
BitMart
BTC-USDC$1.00
0.0000581 Btc
$70,668,033.00
4,103.702 BTC
0.0005%
9
LBank
BTC-USDC$1.00
0.0000581 Btc
$55,241,608.00
3,208.300 BTC
0.0004%
10
Uniswap (Arbitrum One)
0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1-0XFF970A61A04B1CA14834A43F5DE4533EBDDB5CC8$0.9999
0.0000581 Btc
$27,226,664.00
21,592.326 0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1
0.0029%
11
WhiteBIT
USDC-USDT$1.00
0.0000581 Btc
$23,178,415.00
23,173,524.512 USDC
3.0787%
12
Uniswap (v3)
0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2$0.9956
0.0000578 Btc
$22,950,308.00
22,729,000.028 0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48
3.0196%
13
Kraken
USDC-USDT$1.001
0.0000581 Btc
$21,529,656.00
21,517,439.213 USDC
2.8587%
14
Kraken
USDC-USD$1.00
0.0000581 Btc
$21,023,658.00
21,023,658.291 USDC
2.7931%
15
Huobi
USDC-USDT$1.00
0.0000581 Btc
$20,683,592.00
20,679,664.188 USDC
2.7474%
16
Kraken
USDC-EUR$0.9989
0.0000580 Btc
$18,259,359.00
18,279,595.153 USDC
2.4285%
17
BingX
BTC-USDC$1.00
0.0000581 Btc
$16,349,560.00
959.229 BTC
0.0001%
18
Bybit
ETH-USDC$0.9998
0.0000581 Btc
$14,246,943.00
11,132.990 ETH
0.0015%
19
WhiteBIT
BTC-USDC$1.00
0.0000581 Btc
$13,639,723.00
792.021 BTC
0.0001%
20
DigiFinex
USDC-USDT$1.00
0.0000581 Btc
$12,497,312.00
12,494,655.829 USDC
1.6600%
21
BKEX
ETH-USDC$1.00
0.0000581 Btc
$12,495,946.00
9,879.099 ETH
0.0013%
22
P2B
USDC-USDT$1.00
0.0000581 Btc
$11,588,276.00
11,585,813.000 USDC
1.5392%
23
P2B
USDC-BUSD$1.00
0.0000581 Btc
$11,556,125.00
11,551,527.500 USDC
1.5347%
24
BKEX
BTC-USDC$1.00
0.0000581 Btc
$10,896,814.00
638.131 BTC
0.0001%
25
Bybit
BTC-USDC$0.9998
0.0000581 Btc
$9,863,653.00
573.149 BTC
0.0001%
26
Bybit
USDC-USDT$1.00
0.0000581 Btc
$9,288,341.00
9,287,315.130 USDC
1.2339%
27
OKX
ETH-USDC$1.00
0.0000581 Btc
$9,052,096.00
7,154.124 ETH
0.0010%
28
OKX
USDC-USDT$1.00
0.0000581 Btc
$7,963,446.00
7,961,951.290 USDC
1.0578%
29
DigiFinex
ETH-USDC$1.00
0.0000581 Btc
$7,352,957.00
5,742.400 ETH
0.0008%
30
BKEX
USDC-USDT$1.00
0.0000581 Btc
$6,105,184.00
6,104,033.922 USDC
0.8109%
31
OKX
BTC-USDC$1.00
0.0000581 Btc
$5,522,241.00
323.291 BTC
0.0000%
32
BingX
ETH-USDC$1.00
0.0000581 Btc
$5,406,719.00
4,281.820 ETH
0.0006%
33
KuCoin
BTC-USDC$0.9998
0.0000581 Btc
$5,288,403.00
307.234 BTC
0.0000%
34
Uniswap (v3)
0X6B175474E89094C44DA98B954EEDEAC495271D0F-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48$0.9956
0.0000578 Btc
$5,121,322.00
5,143,511.491 0X6B175474E89094C44DA98B954EEDEAC495271D0F
0.6833%
35
DigiFinex
BTC-USDC$1.00
0.0000581 Btc
$4,847,445.00
281.386 BTC
0.0000%
36
KuCoin
USDC-USDT$1.00
0.0000581 Btc
$4,741,393.00
4,741,437.984 USDC
0.6299%
37
KuCoin
USDT-USDC$0.9998
0.0000581 Btc
$4,685,733.00
4,686,437.983 USDT
0.6226%
38
Kraken
USDC-GBP$1.00
0.0000581 Btc
$3,981,203.00
3,980,207.198 USDC
0.5288%
39
XT.COM
USDC-USDT$1.00
0.0000581 Btc
$3,625,148.00
3,624,261.700 USDC
0.4815%
40
Uniswap (v2)
0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2$0.9988
0.0000580 Btc
$3,485,585.00
3,440,660.948 0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48
0.4571%
41
BitMart
ETH-USDC$1.00
0.0000581 Btc
$3,366,966.00
2,628.439 ETH
0.0003%
42
KyberSwap Elastic (Ethereum)
0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48-0XDAC17F958D2EE523A2206206994597C13D831EC7$1.00
0.0000581 Btc
$3,166,479.00
3,165,914.697 0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48
0.4206%
43
Kraken
BTC-USDC$1.00
0.0000581 Btc
$3,123,222.00
181.315 BTC
0.0000%
44
Gemini
USDC-USD$0.9999
0.0000581 Btc
$3,119,427.00
3,119,832.731 USDC
0.4145%
45
Bitget
BTC-USDC$1.00
0.0000581 Btc
$2,309,754.00
135.164 BTC
0.0000%
46
KuCoin
ETH-USDC$0.9998
0.0000581 Btc
$2,285,759.00
1,784.948 ETH
0.0002%
47
Bitstamp
USDC-USD$0.9998
0.0000581 Btc
$2,248,741.00
2,249,101.341 USDC
0.2988%
48
Sushiswap
0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2$1.001
0.0000582 Btc
$2,043,465.00
2,025,315.963 0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48
0.2691%
49
Sushiswap (Arbitrum One)
0XFF970A61A04B1CA14834A43F5DE4533EBDDB5CC8-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1$0.9998
0.0000581 Btc
$2,022,208.00
1,987,325.404 0XFF970A61A04B1CA14834A43F5DE4533EBDDB5CC8
0.2640%
50
MEXC Global
EOS-USDC$0.9998
0.0000581 Btc
$1,789,105.00
1,738,577.460 EOS
0.2310%
51
LBank
USDC-USDT$1.00
0.0000581 Btc
$1,696,449.00
1,696,427.527 USDC
0.2254%
52
Kraken
ETH-USDC$1.00
0.0000581 Btc
$1,631,767.00
1,273.795 ETH
0.0002%
53
Bitstamp
USDC-EUR$0.9974
0.0000579 Btc
$1,548,945.00
1,552,947.014 USDC
0.2063%
54
MEXC Global
BCH-USDC$0.9998
0.0000581 Btc
$1,328,770.00
11,883.730 BCH
0.0016%
55
MEXC Global
XRP-USDC$0.9998
0.0000581 Btc
$1,256,789.00
3,204,136.430 XRP
0.4257%
56
Bitfinex
UDC-USDT$1.00
0.0000581 Btc
$1,205,395.00
1,205,166.192 UDC
0.1601%
57
Binance US
BTC-USDC$0.9998
0.0000581 Btc
$1,106,062.00
64.249 BTC
0.0000%
58
ZigZag (Arbitrum)
WETH-USDC$1.00
0.0000581 Btc
$1,084,596.00
857.222 WETH
0.0001%
59
Binance US
USDC-USD$1.00
0.0000581 Btc
$1,050,638.00
1,050,637.854 USDC
0.1396%
60
Bitget
ETH-USDC$1.00
0.0000581 Btc
$869,880.00
688.587 ETH
0.0001%
61
Canto Dex
0X4E71A2E537B7F9D9413D3991D37958C0B5E1E503-0X80B5A32E4F032B2A058B4F29EC95EEFEEB87ADCD$1.00
0.0000581 Btc
$859,785.00
849,287.538 0X4E71A2E537B7F9D9413D3991D37958C0B5E1E503
0.1128%
62
Hotbit
USDC-USDT$0.9991
0.0000580 Btc
$836,431.00
837,174.790 USDC
0.1112%
63
Tidex
USDC-USDT$1.00
0.0000581 Btc
$811,153.00
811,061.973 USDC
0.1078%
64
Bitget
XRP-USDC$1.00
0.0000581 Btc
$784,507.00
2,004,460.000 XRP
0.2663%
65
Bitget
USDC-USDT$1.00
0.0000581 Btc
$756,971.00
756,712.741 USDC
0.1005%
66
MEXC Global
TRX-USDC$1.00
0.0000581 Btc
$665,583.00
12,194,629.720 TRX
1.6201%
67
MEXC Global
LTC-USDC$1.00
0.0000581 Btc
$658,828.00
8,450.840 LTC
0.0011%
68
PancakeSwap (v2)
0X2170ED0880AC9A755FD29B2688956BD959F933F8-0X8AC76A51CC950D9822D68B83FE1AD97B32CD580D$1.004
0.0000583 Btc
$542,087.00
426.935 0X2170ED0880AC9A755FD29B2688956BD959F933F8
0.0001%
69
Tidex
BTC-USDC$1.00
0.0000581 Btc
$526,124.00
30.557 BTC
0.0000%
70
Coinbase Exchange
USDT-USDC$0.9998
0.0000581 Btc
$522,450.00
522,622.560 USDT
0.0694%
71
BitMart
USDC-USDT$1.00
0.0000581 Btc
$512,564.00
512,430.560 USDC
0.0681%
72
BitMart
DOGE-USDC$1.00
0.0000581 Btc
$509,615.00
5,179,656.000 DOGE
0.6881%
73
Uniswap (v3)
0X111111111117DC0AA78B770FA6A738034120C302-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48$0.9956
0.0000578 Btc
$392,161.00
891,588.320 0X111111111117DC0AA78B770FA6A738034120C302
0.1185%
74
Coinbase Exchange
USDC-GBP$1.00
0.0000581 Btc
$366,086.00
365,949.350 USDC
0.0486%
75
Coinfield
BTC-USDC$1.00
0.0000581 Btc
$351,207.00
20.411 BTC
0.0000%
76
PancakeSwap (v2)
0X8AC76A51CC950D9822D68B83FE1AD97B32CD580D-BUSD$0.9981
0.0000580 Btc
$350,651.00
350,324.784 0X8AC76A51CC950D9822D68B83FE1AD97B32CD580D
0.0465%
77
Okcoin
USDC-USD$1.00
0.0000581 Btc
$304,547.00
304,547.496 USDC
0.0405%
78
BKEX
ATOM-USDC$1.00
0.0000581 Btc
$297,693.00
30,616.041 ATOM
0.0041%
79
Velodrome Finance
0X8C6F28F2F1A3C87F0F938B96D27520D9751EC8D9-0X7F5C764CBC14F9669B88837CA1490CCA17C31607$0.9997
0.0000581 Btc
$278,542.00
276,962.705 0X8C6F28F2F1A3C87F0F938B96D27520D9751EC8D9
0.0368%
80
KuCoin
BUSD-USDC$1.00
0.0000581 Btc
$278,495.00
278,710.001 BUSD
0.0370%
81
Bitget
BCH-USDC$1.00
0.0000581 Btc
$271,110.00
2,445.721 BCH
0.0003%
82
BitMart
ADA-USDC$1.00
0.0000581 Btc
$265,187.00
844,448.000 ADA
0.1122%
83
Coinbase Exchange
USDC-EUR$0.9991
0.0000580 Btc
$262,318.00
262,553.080 USDC
0.0349%
84
Maiar
WEGLD-BD4D79-USDC-C76F1F$1.031
0.0000599 Btc
$256,069.00
5,610.025 WEGLD-BD4D79
0.0007%
85
Kraken
USDC-AUD$0.9994
0.0000580 Btc
$249,243.00
249,402.678 USDC
0.0331%
86
Phemex
USDC-USDT$1.00
0.0000581 Btc
$244,842.00
244,765.600 USDC
0.0325%
87
BKEX
SOL-USDC$1.00
0.0000581 Btc
$236,745.00
17,419.183 SOL
0.0023%
88
Bitstamp
BTC-USDC$1.00
0.0000581 Btc
$181,984.00
10.581 BTC
0.0000%
89
BitMart
DAI-USDC$1.00
0.0000581 Btc
$168,158.00
168,203.800 DAI
0.0223%
90
Bitget
MATIC-USDC$1.00
0.0000581 Btc
$159,823.00
174,996.600 MATIC
0.0232%
91
Bitget
ADA-USDC$1.00
0.0000581 Btc
$150,034.00
479,914.000 ADA
0.0638%
92
CoinJar Exchange
USDC-AUD$0.9977
0.0000580 Btc
$134,077.00
134,381.821 USDC
0.0179%
93
PancakeSwap (v2)
0X8AC76A51CC950D9822D68B83FE1AD97B32CD580D-USDT$0.9978
0.0000579 Btc
$133,543.00
133,523.846 0X8AC76A51CC950D9822D68B83FE1AD97B32CD580D
0.0177%
94
CoinEx
USDC-USDT$1.001
0.0000581 Btc
$126,953.00
126,906.469 USDC
0.0169%
95
BitMart
BUSD-USDC$1.00
0.0000581 Btc
$116,460.00
116,444.600 BUSD
0.0155%
96
Bitget
AVAX-USDC$1.00
0.0000581 Btc
$110,132.00
8,261.460 AVAX
0.0011%
97
Bitget
TRX-USDC$1.00
0.0000581 Btc
$100,262.00
1,862,472.100 TRX
0.2474%
98
Bitget
DOGE-USDC$1.00
0.0000581 Btc
$79,435.00
815,532.519 DOGE
0.1083%
99
Bittrex
USDC-USD$0.9996
0.0000580 Btc
$76,661.00
76,690.158 USDC
0.0102%
100
Bitget
EOS-USDC$1.00
0.0000581 Btc
$75,846.00
75,931.500 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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