USD Coin

Token

Overview[ERC-20]

Max Total Supply

41,428,403,764.28

USDC

Holders

3,394,657+0.12%

Transfers

146,877,755

Profile Summary

Contract

0xa0b869-06eb48

Decimals

Market

Price

$0.999905 @0.00041461 ETH+0.02%

Volume (24H)

$9,048,837,305

Circulating Market Cap

$61,591,639,514

Contract Source Code Verified

Contract NameFiatTokenProxy

Compiler Versionv0.4.24+commit.e67f0147

Optimization EnabledNo

Other SettingsDefault evmVersion

Contract Source Code (Solidity)

1
 
2
pragma solidity ^0.4.24;
3
 
4
// File: zos-lib/contracts/upgradeability/Proxy.sol
5
 
6
/**
7
 * @title Proxy
8
 * @dev Implements delegation of calls to other contracts, with proper
9
 * forwarding of return values and bubbling of failures.
10
 * It defines a fallback function that delegates all calls to the address
11
 * returned by the abstract _implementation() internal function.
12
 */
13
contract Proxy {
14
  /**
15
   * @dev Fallback function.
16
   * Implemented entirely in `_fallback`.
17
   */
18
  function () payable external {
19
    _fallback();
20
  }
21
 
22
  /**
23
   * @return The Address of the implementation.
24
   */
25
  function _implementation() internal view returns (address);
26
 
27
  /**
28
   * @dev Delegates execution to an implementation contract.
29
   * This is a low level function that doesn't return to its internal call site.
30
   * It will return to the external caller whatever the implementation returns.
31
   * @param implementation Address to delegate.
32
   */
33
  function _delegate(address implementation) internal {
34
    assembly {
35
      // Copy msg.data. We take full control of memory in this inline assembly
36
      // block because it will not return to Solidity code. We overwrite the
37
      // Solidity scratch pad at memory position 0.
38
      calldatacopy(0, 0, calldatasize)
39
 
40
      // Call the implementation.
41
      // out and outsize are 0 because we don't know the size yet.
42
      let result := delegatecall(gas, implementation, 0, calldatasize, 0, 0)
43
 
44
      // Copy the returned data.
45
      returndatacopy(0, 0, returndatasize)
46
 
47
      switch result
48
      // delegatecall returns 0 on error.
49
      case 0 { revert(0, returndatasize) }
50
      default { return(0, returndatasize) }
51
    }
52
  }
53
 
54
  /**
55
   * @dev Function that is run as the first thing in the fallback function.
56
   * Can be redefined in derived contracts to add functionality.
57
   * Redefinitions must call super._willFallback().
58
   */
59
  function _willFallback() internal {
60
  }
61
 
62
  /**
63
   * @dev fallback implementation.
64
   * Extracted to enable manual triggering.
65
   */
66
  function _fallback() internal {
67
    _willFallback();
68
    _delegate(_implementation());
69
  }
70
}
71
 
72
// File: openzeppelin-solidity/contracts/AddressUtils.sol
73
 
74
/**
75
 * Utility library of inline functions on addresses
76
 */
77
library AddressUtils {
78
 
79
  /**
80
   * Returns whether the target address is a contract
81
   * @dev This function will return false if invoked during the constructor of a contract,
82
   * as the code is not actually created until after the constructor finishes.
83
   * @param addr address to check
84
   * @return whether the target address is a contract
85
   */
86
  function isContract(address addr) internal view returns (bool) {
87
    uint256 size;
88
    // XXX Currently there is no better way to check if there is a contract in an address
89
    // than to check the size of the code at that address.
90
    // See https://ethereum.stackexchange.com/a/14016/36603
91
    // for more details about how this works.
92
    // TODO Check this again before the Serenity release, because all addresses will be
93
    // contracts then.
94
    // solium-disable-next-line security/no-inline-assembly
95
    assembly { size := extcodesize(addr) }
96
    return size > 0;
97
  }
98
 
99
}
100
 
101
// File: zos-lib/contracts/upgradeability/UpgradeabilityProxy.sol
102
 
103
/**
104
 * @title UpgradeabilityProxy
105
 * @dev This contract implements a proxy that allows to change the
106
 * implementation address to which it will delegate.
107
 * Such a change is called an implementation upgrade.
108
 */
109
contract UpgradeabilityProxy is Proxy {
110
  /**
111
   * @dev Emitted when the implementation is upgraded.
112
   * @param implementation Address of the new implementation.
113
   */
114
  event Upgraded(address implementation);
115
 
116
  /**
117
   * @dev Storage slot with the address of the current implementation.
118
   * This is the keccak-256 hash of "org.zeppelinos.proxy.implementation", and is
119
   * validated in the constructor.
120
   */
121
  bytes32 private constant IMPLEMENTATION_SLOT = 0x7050c9e0f4ca769c69bd3a8ef740bc37934f8e2c036e5a723fd8ee048ed3f8c3;
122
 
123
  /**
124
   * @dev Contract constructor.
125
   * @param _implementation Address of the initial implementation.
126
   */
127
  constructor(address _implementation) public {
128
    assert(IMPLEMENTATION_SLOT == keccak256("org.zeppelinos.proxy.implementation"));
129
 
130
    _setImplementation(_implementation);
131
  }
132
 
133
  /**
134
   * @dev Returns the current implementation.
135
   * @return Address of the current implementation
136
   */
137
  function _implementation() internal view returns (address impl) {
138
    bytes32 slot = IMPLEMENTATION_SLOT;
139
    assembly {
140
      impl := sload(slot)
141
    }
142
  }
143
 
144
  /**
145
   * @dev Upgrades the proxy to a new implementation.
146
   * @param newImplementation Address of the new implementation.
147
   */
148
  function _upgradeTo(address newImplementation) internal {
149
    _setImplementation(newImplementation);
150
    emit Upgraded(newImplementation);
151
  }
152
 
153
  /**
154
   * @dev Sets the implementation address of the proxy.
155
   * @param newImplementation Address of the new implementation.
156
   */
157
  function _setImplementation(address newImplementation) private {
158
    require(AddressUtils.isContract(newImplementation), "Cannot set a proxy implementation to a non-contract address");
159
 
160
    bytes32 slot = IMPLEMENTATION_SLOT;
161
 
162
    assembly {
163
      sstore(slot, newImplementation)
164
    }
165
  }
166
}
167
 
168
// File: zos-lib/contracts/upgradeability/AdminUpgradeabilityProxy.sol
169
 
170
/**
171
 * @title AdminUpgradeabilityProxy
172
 * @dev This contract combines an upgradeability proxy with an authorization
173
 * mechanism for administrative tasks.
174
 * All external functions in this contract must be guarded by the
175
 * `ifAdmin` modifier. See ethereum/solidity#3864 for a Solidity
176
 * feature proposal that would enable this to be done automatically.
177
 */
178
contract AdminUpgradeabilityProxy is UpgradeabilityProxy {
179
  /**
180
   * @dev Emitted when the administration has been transferred.
181
   * @param previousAdmin Address of the previous admin.
182
   * @param newAdmin Address of the new admin.
183
   */
184
  event AdminChanged(address previousAdmin, address newAdmin);
185
 
186
  /**
187
   * @dev Storage slot with the admin of the contract.
188
   * This is the keccak-256 hash of "org.zeppelinos.proxy.admin", and is
189
   * validated in the constructor.
190
   */
191
  bytes32 private constant ADMIN_SLOT = 0x10d6a54a4754c8869d6886b5f5d7fbfa5b4522237ea5c60d11bc4e7a1ff9390b;
192
 
193
  /**
194
   * @dev Modifier to check whether the `msg.sender` is the admin.
195
   * If it is, it will run the function. Otherwise, it will delegate the call
196
   * to the implementation.
197
   */
198
  modifier ifAdmin() {
199
    if (msg.sender == _admin()) {
200
      _;
201
    } else {
202
      _fallback();
203
    }
204
  }
205
 
206
  /**
207
   * Contract constructor.
208
   * It sets the `msg.sender` as the proxy administrator.
209
   * @param _implementation address of the initial implementation.
210
   */
211
  constructor(address _implementation) UpgradeabilityProxy(_implementation) public {
212
    assert(ADMIN_SLOT == keccak256("org.zeppelinos.proxy.admin"));
213
 
214
    _setAdmin(msg.sender);
215
  }
216
 
217
  /**
218
   * @return The address of the proxy admin.
219
   */
220
  function admin() external view ifAdmin returns (address) {
221
    return _admin();
222
  }
223
 
224
  /**
225
   * @return The address of the implementation.
226
   */
227
  function implementation() external view ifAdmin returns (address) {
228
    return _implementation();
229
  }
230
 
231
  /**
232
   * @dev Changes the admin of the proxy.
233
   * Only the current admin can call this function.
234
   * @param newAdmin Address to transfer proxy administration to.
235
   */
236
  function changeAdmin(address newAdmin) external ifAdmin {
237
    require(newAdmin != address(0), "Cannot change the admin of a proxy to the zero address");
238
    emit AdminChanged(_admin(), newAdmin);
239
    _setAdmin(newAdmin);
240
  }
241
 
242
  /**
243
   * @dev Upgrade the backing implementation of the proxy.
244
   * Only the admin can call this function.
245
   * @param newImplementation Address of the new implementation.
246
   */
247
  function upgradeTo(address newImplementation) external ifAdmin {
248
    _upgradeTo(newImplementation);
249
  }
250
 
251
  /**
252
   * @dev Upgrade the backing implementation of the proxy and call a function
253
   * on the new implementation.
254
   * This is useful to initialize the proxied contract.
255
   * @param newImplementation Address of the new implementation.
256
   * @param data Data to send as msg.data in the low level call.
257
   * It should include the signature and the parameters of the function to be
258
   * called, as described in
259
   * https://solidity.readthedocs.io/en/develop/abi-spec.html#function-selector-and-argument-encoding.
260
   */
261
  function upgradeToAndCall(address newImplementation, bytes data) payable external ifAdmin {
262
    _upgradeTo(newImplementation);
263
    require(address(this).call.value(msg.value)(data));
264
  }
265
 
266
  /**
267
   * @return The admin slot.
268
   */
269
  function _admin() internal view returns (address adm) {
270
    bytes32 slot = ADMIN_SLOT;
271
    assembly {
272
      adm := sload(slot)
273
    }
274
  }
275
 
276
  /**
277
   * @dev Sets the address of the proxy admin.
278
   * @param newAdmin Address of the new proxy admin.
279
   */
280
  function _setAdmin(address newAdmin) internal {
281
    bytes32 slot = ADMIN_SLOT;
282
 
283
    assembly {
284
      sstore(slot, newAdmin)
285
    }
286
  }
287
 
288
  /**
289
   * @dev Only fall back when the sender is not the admin.
290
   */
291
  function _willFallback() internal {
292
    require(msg.sender != _admin(), "Cannot call fallback function from the proxy admin");
293
    super._willFallback();
294
  }
295
}
296
 
297
// File: contracts/FiatTokenProxy.sol
298
 
299
/**
300
* Copyright CENTRE SECZ 2018
301
*
302
* Permission is hereby granted, free of charge, to any person obtaining a copy 
303
* of this software and associated documentation files (the "Software"), to deal 
304
* in the Software without restriction, including without limitation the rights 
305
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 
306
* copies of the Software, and to permit persons to whom the Software is furnished to 
307
* do so, subject to the following conditions:
308
*
309
* The above copyright notice and this permission notice shall be included in all 
310
* copies or substantial portions of the Software.
311
*
312
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 
313
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 
314
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 
315
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
316
* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN 
317
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
318
*/
319
 
320
pragma solidity ^0.4.24;
321
 
322
 
323
/**
324
 * @title FiatTokenProxy
325
 * @dev This contract proxies FiatToken calls and enables FiatToken upgrades
326
*/ 
327
contract FiatTokenProxy is AdminUpgradeabilityProxy {
328
    constructor(address _implementation) public AdminUpgradeabilityProxy(_implementation) {
329
    }
330
}

Contract ABI

[
  {
    "constant": false,
    "inputs": [
      {
        "name": "newImplementation",
        "type": "address"
      }
    ],
    "name": "upgradeTo",
    "outputs": [],
    "payable": false,
    "stateMutability": "nonpayable",
    "type": "function"
  },
  {
    "constant": false,
    "inputs": [
      {
        "name": "newImplementation",
        "type": "address"
      },
      {
        "name": "data",
        "type": "bytes"
      }
    ],
    "name": "upgradeToAndCall",
    "outputs": [],
    "payable": true,
    "stateMutability": "payable",
    "type": "function"
  },
  {
    "constant": true,
    "inputs": [],
    "name": "implementation",
    "outputs": [
      {
        "name": "",
        "type": "address"
      }
    ],
    "payable": false,
    "stateMutability": "view",
    "type": "function"
  },
  {
    "constant": false,
    "inputs": [
      {
        "name": "newAdmin",
        "type": "address"
      }
    ],
    "name": "changeAdmin",
    "outputs": [],
    "payable": false,
    "stateMutability": "nonpayable",
    "type": "function"
  },
  {
    "constant": true,
    "inputs": [],
    "name": "admin",
    "outputs": [
      {
        "name": "",
        "type": "address"
      }
    ],
    "payable": false,
    "stateMutability": "view",
    "type": "function"
  },
  {
    "inputs": [
      {
        "name": "_implementation",
        "type": "address"
      }
    ],
    "payable": false,
    "stateMutability": "nonpayable",
    "type": "constructor"
  },
  {
    "payable": true,
    "stateMutability": "payable",
    "type": "fallback"
  },
  {
    "anonymous": false,
    "inputs": [
      {
        "indexed": false,
        "name": "previousAdmin",
        "type": "address"
      },
      {
        "indexed": false,
        "name": "newAdmin",
        "type": "address"
      }
    ],
    "name": "AdminChanged",
    "type": "event"
  },
  {
    "anonymous": false,
    "inputs": [
      {
        "indexed": false,
        "name": "implementation",
        "type": "address"
      }
    ],
    "name": "Upgraded",
    "type": "event"
  }
]

Contract Creation Code

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