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Latest 25 from a total of 3,553 transactions
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Eth To Token Tra... | 17444646 | 546 days ago | IN | 0.00006361 ETH | 0.0013645 | ||||
Eth To Token Tra... | 16867617 | 627 days ago | IN | 0.0001 ETH | 0.00090565 | ||||
Token To Eth Swa... | 12795580 | 1246 days ago | IN | 0 ETH | 0.00060497 | ||||
Eth To Token Swa... | 12795506 | 1246 days ago | IN | 0.004 ETH | 0.00119124 | ||||
Eth To Token Tra... | 12016133 | 1366 days ago | IN | 0.001 ETH | 0.00765681 | ||||
Token To Token S... | 12006348 | 1368 days ago | IN | 0 ETH | 0.01088895 | ||||
Token To Token S... | 11934763 | 1379 days ago | IN | 0 ETH | 0.01089277 | ||||
Eth To Token Tra... | 11797506 | 1400 days ago | IN | 0.001 ETH | 0.013433 | ||||
Eth To Token Tra... | 11742131 | 1409 days ago | IN | 0.00000154 ETH | 0.00421193 | ||||
Token To Token T... | 11658043 | 1421 days ago | IN | 0 ETH | 0.00368263 | ||||
Token To Token T... | 11657900 | 1421 days ago | IN | 0 ETH | 0.0044638 | ||||
Token To Token T... | 11657884 | 1421 days ago | IN | 0 ETH | 0.004058 | ||||
Token To Token T... | 11657791 | 1421 days ago | IN | 0 ETH | 0.0042609 | ||||
Eth To Token Tra... | 11542560 | 1439 days ago | IN | 0.00015553 ETH | 0.0083473 | ||||
Eth To Token Tra... | 11357775 | 1468 days ago | IN | 0.00326802 ETH | 0.00382772 | ||||
Eth To Token Tra... | 11356939 | 1468 days ago | IN | 0.0000004 ETH | 0.00282042 | ||||
Eth To Token Tra... | 11292845 | 1478 days ago | IN | 0.00100451 ETH | 0.00342541 | ||||
Eth To Token Tra... | 11287042 | 1478 days ago | IN | 0.00000046 ETH | 0.00195205 | ||||
Eth To Token Tra... | 11126140 | 1503 days ago | IN | 0.003 ETH | 0.00188062 | ||||
Eth To Token Tra... | 11088649 | 1509 days ago | IN | 0.00023141 ETH | 0.00133422 | ||||
Eth To Token Tra... | 11088649 | 1509 days ago | IN | 0.00023141 ETH | 0.00133422 | ||||
Eth To Token Tra... | 11088649 | 1509 days ago | IN | 0.00023141 ETH | 0.00120158 | ||||
Eth To Token Tra... | 11064315 | 1513 days ago | IN | 0.001 ETH | 0.00564186 | ||||
Token To Eth Tra... | 11051210 | 1515 days ago | IN | 0 ETH | 0.00130468 | ||||
Eth To Token Tra... | 11023099 | 1519 days ago | IN | 0.001 ETH | 0.00322392 |
Latest 25 internal transactions (View All)
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21304337 | 6 days ago | 0.00379999 ETH | ||||
21105497 | 33 days ago | 0.00119263 ETH | ||||
21101742 | 34 days ago | 0.00174949 ETH | ||||
20860342 | 68 days ago | 0.0001 ETH | ||||
20860324 | 68 days ago | 0.0001 ETH | ||||
20854899 | 68 days ago | 0.0001 ETH | ||||
20839911 | 70 days ago | 0.00417727 ETH | ||||
20744580 | 84 days ago | 0.00329533 ETH | ||||
20744489 | 84 days ago | 0.00554411 ETH | ||||
20716317 | 88 days ago | 0.00120998 ETH | ||||
20543413 | 112 days ago | 40.00044103 ETH | ||||
20543413 | 112 days ago | 40 ETH | ||||
20538905 | 113 days ago | 0.00172185 ETH | ||||
20487892 | 120 days ago | 0.00038684 ETH | ||||
20344275 | 140 days ago | 0.00173162 ETH | ||||
20241345 | 154 days ago | 0.00393627 ETH | ||||
20241263 | 154 days ago | 0.00394591 ETH | ||||
20200225 | 160 days ago | 0.00191664 ETH | ||||
20199643 | 160 days ago | 0.00301188 ETH | ||||
20135263 | 169 days ago | 0.00136226 ETH | ||||
20103479 | 173 days ago | 0.00048 ETH | ||||
19929995 | 198 days ago | 0.00344187 ETH | ||||
19898658 | 202 days ago | 0.00224161 ETH | ||||
19585873 | 246 days ago | 0.00569102 ETH | ||||
17706874 | 509 days ago | 0.001 ETH |
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Minimal Proxy Contract for 0x2157a7894439191e520825fe9399ab8655e0f708
Contract Name:
Vyper_contract
Compiler Version
vyper:0.1.0b4
Optimization Enabled:
N/A
Other Settings:
default evmVersion
Contract Source Code (Vyper language format)
# @title Uniswap Exchange Interface V1 # @notice Source code found at https://github.com/uniswap # @notice Use at your own risk contract Factory(): def getExchange(token_addr: address) -> address: constant contract Exchange(): def getEthToTokenOutputPrice(tokens_bought: uint256) -> uint256(wei): constant def ethToTokenTransferInput(min_tokens: uint256, deadline: timestamp, recipient: address) -> uint256: modifying def ethToTokenTransferOutput(tokens_bought: uint256, deadline: timestamp, recipient: address) -> uint256(wei): modifying TokenPurchase: event({buyer: indexed(address), eth_sold: indexed(uint256(wei)), tokens_bought: indexed(uint256)}) EthPurchase: event({buyer: indexed(address), tokens_sold: indexed(uint256), eth_bought: indexed(uint256(wei))}) AddLiquidity: event({provider: indexed(address), eth_amount: indexed(uint256(wei)), token_amount: indexed(uint256)}) RemoveLiquidity: event({provider: indexed(address), eth_amount: indexed(uint256(wei)), token_amount: indexed(uint256)}) Transfer: event({_from: indexed(address), _to: indexed(address), _value: uint256}) Approval: event({_owner: indexed(address), _spender: indexed(address), _value: uint256}) name: public(bytes32) # Uniswap V1 symbol: public(bytes32) # UNI-V1 decimals: public(uint256) # 18 totalSupply: public(uint256) # total number of UNI in existence balances: uint256[address] # UNI balance of an address allowances: (uint256[address])[address] # UNI allowance of one address on another token: address(ERC20) # address of the ERC20 token traded on this contract factory: Factory # interface for the factory that created this contract # @dev This function acts as a contract constructor which is not currently supported in contracts deployed # using create_with_code_of(). It is called once by the factory during contract creation. @public def setup(token_addr: address): assert (self.factory == ZERO_ADDRESS and self.token == ZERO_ADDRESS) and token_addr != ZERO_ADDRESS self.factory = msg.sender self.token = token_addr self.name = 0x556e697377617020563100000000000000000000000000000000000000000000 self.symbol = 0x554e492d56310000000000000000000000000000000000000000000000000000 self.decimals = 18 # @notice Deposit ETH and Tokens (self.token) at current ratio to mint UNI tokens. # @dev min_liquidity does nothing when total UNI supply is 0. # @param min_liquidity Minimum number of UNI sender will mint if total UNI supply is greater than 0. # @param max_tokens Maximum number of tokens deposited. Deposits max amount if total UNI supply is 0. # @param deadline Time after which this transaction can no longer be executed. # @return The amount of UNI minted. @public @payable def addLiquidity(min_liquidity: uint256, max_tokens: uint256, deadline: timestamp) -> uint256: assert deadline > block.timestamp and (max_tokens > 0 and msg.value > 0) total_liquidity: uint256 = self.totalSupply if total_liquidity > 0: assert min_liquidity > 0 eth_reserve: uint256(wei) = self.balance - msg.value token_reserve: uint256 = self.token.balanceOf(self) token_amount: uint256 = msg.value * token_reserve / eth_reserve + 1 liquidity_minted: uint256 = msg.value * total_liquidity / eth_reserve assert max_tokens >= token_amount and liquidity_minted >= min_liquidity self.balances[msg.sender] += liquidity_minted self.totalSupply = total_liquidity + liquidity_minted assert self.token.transferFrom(msg.sender, self, token_amount) log.AddLiquidity(msg.sender, msg.value, token_amount) log.Transfer(ZERO_ADDRESS, msg.sender, liquidity_minted) return liquidity_minted else: assert (self.factory != ZERO_ADDRESS and self.token != ZERO_ADDRESS) and msg.value >= 1000000000 assert self.factory.getExchange(self.token) == self token_amount: uint256 = max_tokens initial_liquidity: uint256 = as_unitless_number(self.balance) self.totalSupply = initial_liquidity self.balances[msg.sender] = initial_liquidity assert self.token.transferFrom(msg.sender, self, token_amount) log.AddLiquidity(msg.sender, msg.value, token_amount) log.Transfer(ZERO_ADDRESS, msg.sender, initial_liquidity) return initial_liquidity # @dev Burn UNI tokens to withdraw ETH and Tokens at current ratio. # @param amount Amount of UNI burned. # @param min_eth Minimum ETH withdrawn. # @param min_tokens Minimum Tokens withdrawn. # @param deadline Time after which this transaction can no longer be executed. # @return The amount of ETH and Tokens withdrawn. @public def removeLiquidity(amount: uint256, min_eth: uint256(wei), min_tokens: uint256, deadline: timestamp) -> (uint256(wei), uint256): assert (amount > 0 and deadline > block.timestamp) and (min_eth > 0 and min_tokens > 0) total_liquidity: uint256 = self.totalSupply assert total_liquidity > 0 token_reserve: uint256 = self.token.balanceOf(self) eth_amount: uint256(wei) = amount * self.balance / total_liquidity token_amount: uint256 = amount * token_reserve / total_liquidity assert eth_amount >= min_eth and token_amount >= min_tokens self.balances[msg.sender] -= amount self.totalSupply = total_liquidity - amount send(msg.sender, eth_amount) assert self.token.transfer(msg.sender, token_amount) log.RemoveLiquidity(msg.sender, eth_amount, token_amount) log.Transfer(msg.sender, ZERO_ADDRESS, amount) return eth_amount, token_amount # @dev Pricing function for converting between ETH and Tokens. # @param input_amount Amount of ETH or Tokens being sold. # @param input_reserve Amount of ETH or Tokens (input type) in exchange reserves. # @param output_reserve Amount of ETH or Tokens (output type) in exchange reserves. # @return Amount of ETH or Tokens bought. @private @constant def getInputPrice(input_amount: uint256, input_reserve: uint256, output_reserve: uint256) -> uint256: assert input_reserve > 0 and output_reserve > 0 input_amount_with_fee: uint256 = input_amount * 997 numerator: uint256 = input_amount_with_fee * output_reserve denominator: uint256 = (input_reserve * 1000) + input_amount_with_fee return numerator / denominator # @dev Pricing function for converting between ETH and Tokens. # @param output_amount Amount of ETH or Tokens being bought. # @param input_reserve Amount of ETH or Tokens (input type) in exchange reserves. # @param output_reserve Amount of ETH or Tokens (output type) in exchange reserves. # @return Amount of ETH or Tokens sold. @private @constant def getOutputPrice(output_amount: uint256, input_reserve: uint256, output_reserve: uint256) -> uint256: assert input_reserve > 0 and output_reserve > 0 numerator: uint256 = input_reserve * output_amount * 1000 denominator: uint256 = (output_reserve - output_amount) * 997 return numerator / denominator + 1 @private def ethToTokenInput(eth_sold: uint256(wei), min_tokens: uint256, deadline: timestamp, buyer: address, recipient: address) -> uint256: assert deadline >= block.timestamp and (eth_sold > 0 and min_tokens > 0) token_reserve: uint256 = self.token.balanceOf(self) tokens_bought: uint256 = self.getInputPrice(as_unitless_number(eth_sold), as_unitless_number(self.balance - eth_sold), token_reserve) assert tokens_bought >= min_tokens assert self.token.transfer(recipient, tokens_bought) log.TokenPurchase(buyer, eth_sold, tokens_bought) return tokens_bought # @notice Convert ETH to Tokens. # @dev User specifies exact input (msg.value). # @dev User cannot specify minimum output or deadline. @public @payable def __default__(): self.ethToTokenInput(msg.value, 1, block.timestamp, msg.sender, msg.sender) # @notice Convert ETH to Tokens. # @dev User specifies exact input (msg.value) and minimum output. # @param min_tokens Minimum Tokens bought. # @param deadline Time after which this transaction can no longer be executed. # @return Amount of Tokens bought. @public @payable def ethToTokenSwapInput(min_tokens: uint256, deadline: timestamp) -> uint256: return self.ethToTokenInput(msg.value, min_tokens, deadline, msg.sender, msg.sender) # @notice Convert ETH to Tokens and transfers Tokens to recipient. # @dev User specifies exact input (msg.value) and minimum output # @param min_tokens Minimum Tokens bought. # @param deadline Time after which this transaction can no longer be executed. # @param recipient The address that receives output Tokens. # @return Amount of Tokens bought. @public @payable def ethToTokenTransferInput(min_tokens: uint256, deadline: timestamp, recipient: address) -> uint256: assert recipient != self and recipient != ZERO_ADDRESS return self.ethToTokenInput(msg.value, min_tokens, deadline, msg.sender, recipient) @private def ethToTokenOutput(tokens_bought: uint256, max_eth: uint256(wei), deadline: timestamp, buyer: address, recipient: address) -> uint256(wei): assert deadline >= block.timestamp and (tokens_bought > 0 and max_eth > 0) token_reserve: uint256 = self.token.balanceOf(self) eth_sold: uint256 = self.getOutputPrice(tokens_bought, as_unitless_number(self.balance - max_eth), token_reserve) # Throws if eth_sold > max_eth eth_refund: uint256(wei) = max_eth - as_wei_value(eth_sold, 'wei') if eth_refund > 0: send(buyer, eth_refund) assert self.token.transfer(recipient, tokens_bought) log.TokenPurchase(buyer, as_wei_value(eth_sold, 'wei'), tokens_bought) return as_wei_value(eth_sold, 'wei') # @notice Convert ETH to Tokens. # @dev User specifies maximum input (msg.value) and exact output. # @param tokens_bought Amount of tokens bought. # @param deadline Time after which this transaction can no longer be executed. # @return Amount of ETH sold. @public @payable def ethToTokenSwapOutput(tokens_bought: uint256, deadline: timestamp) -> uint256(wei): return self.ethToTokenOutput(tokens_bought, msg.value, deadline, msg.sender, msg.sender) # @notice Convert ETH to Tokens and transfers Tokens to recipient. # @dev User specifies maximum input (msg.value) and exact output. # @param tokens_bought Amount of tokens bought. # @param deadline Time after which this transaction can no longer be executed. # @param recipient The address that receives output Tokens. # @return Amount of ETH sold. @public @payable def ethToTokenTransferOutput(tokens_bought: uint256, deadline: timestamp, recipient: address) -> uint256(wei): assert recipient != self and recipient != ZERO_ADDRESS return self.ethToTokenOutput(tokens_bought, msg.value, deadline, msg.sender, recipient) @private def tokenToEthInput(tokens_sold: uint256, min_eth: uint256(wei), deadline: timestamp, buyer: address, recipient: address) -> uint256(wei): assert deadline >= block.timestamp and (tokens_sold > 0 and min_eth > 0) token_reserve: uint256 = self.token.balanceOf(self) eth_bought: uint256 = self.getInputPrice(tokens_sold, token_reserve, as_unitless_number(self.balance)) wei_bought: uint256(wei) = as_wei_value(eth_bought, 'wei') assert wei_bought >= min_eth send(recipient, wei_bought) assert self.token.transferFrom(buyer, self, tokens_sold) log.EthPurchase(buyer, tokens_sold, wei_bought) return wei_bought # @notice Convert Tokens to ETH. # @dev User specifies exact input and minimum output. # @param tokens_sold Amount of Tokens sold. # @param min_eth Minimum ETH purchased. # @param deadline Time after which this transaction can no longer be executed. # @return Amount of ETH bought. @public def tokenToEthSwapInput(tokens_sold: uint256, min_eth: uint256(wei), deadline: timestamp) -> uint256(wei): return self.tokenToEthInput(tokens_sold, min_eth, deadline, msg.sender, msg.sender) # @notice Convert Tokens to ETH and transfers ETH to recipient. # @dev User specifies exact input and minimum output. # @param tokens_sold Amount of Tokens sold. # @param min_eth Minimum ETH purchased. # @param deadline Time after which this transaction can no longer be executed. # @param recipient The address that receives output ETH. # @return Amount of ETH bought. @public def tokenToEthTransferInput(tokens_sold: uint256, min_eth: uint256(wei), deadline: timestamp, recipient: address) -> uint256(wei): assert recipient != self and recipient != ZERO_ADDRESS return self.tokenToEthInput(tokens_sold, min_eth, deadline, msg.sender, recipient) @private def tokenToEthOutput(eth_bought: uint256(wei), max_tokens: uint256, deadline: timestamp, buyer: address, recipient: address) -> uint256: assert deadline >= block.timestamp and eth_bought > 0 token_reserve: uint256 = self.token.balanceOf(self) tokens_sold: uint256 = self.getOutputPrice(as_unitless_number(eth_bought), token_reserve, as_unitless_number(self.balance)) # tokens sold is always > 0 assert max_tokens >= tokens_sold send(recipient, eth_bought) assert self.token.transferFrom(buyer, self, tokens_sold) log.EthPurchase(buyer, tokens_sold, eth_bought) return tokens_sold # @notice Convert Tokens to ETH. # @dev User specifies maximum input and exact output. # @param eth_bought Amount of ETH purchased. # @param max_tokens Maximum Tokens sold. # @param deadline Time after which this transaction can no longer be executed. # @return Amount of Tokens sold. @public def tokenToEthSwapOutput(eth_bought: uint256(wei), max_tokens: uint256, deadline: timestamp) -> uint256: return self.tokenToEthOutput(eth_bought, max_tokens, deadline, msg.sender, msg.sender) # @notice Convert Tokens to ETH and transfers ETH to recipient. # @dev User specifies maximum input and exact output. # @param eth_bought Amount of ETH purchased. # @param max_tokens Maximum Tokens sold. # @param deadline Time after which this transaction can no longer be executed. # @param recipient The address that receives output ETH. # @return Amount of Tokens sold. @public def tokenToEthTransferOutput(eth_bought: uint256(wei), max_tokens: uint256, deadline: timestamp, recipient: address) -> uint256: assert recipient != self and recipient != ZERO_ADDRESS return self.tokenToEthOutput(eth_bought, max_tokens, deadline, msg.sender, recipient) @private def tokenToTokenInput(tokens_sold: uint256, min_tokens_bought: uint256, min_eth_bought: uint256(wei), deadline: timestamp, buyer: address, recipient: address, exchange_addr: address) -> uint256: assert (deadline >= block.timestamp and tokens_sold > 0) and (min_tokens_bought > 0 and min_eth_bought > 0) assert exchange_addr != self and exchange_addr != ZERO_ADDRESS token_reserve: uint256 = self.token.balanceOf(self) eth_bought: uint256 = self.getInputPrice(tokens_sold, token_reserve, as_unitless_number(self.balance)) wei_bought: uint256(wei) = as_wei_value(eth_bought, 'wei') assert wei_bought >= min_eth_bought assert self.token.transferFrom(buyer, self, tokens_sold) tokens_bought: uint256 = Exchange(exchange_addr).ethToTokenTransferInput(min_tokens_bought, deadline, recipient, value=wei_bought) log.EthPurchase(buyer, tokens_sold, wei_bought) return tokens_bought # @notice Convert Tokens (self.token) to Tokens (token_addr). # @dev User specifies exact input and minimum output. # @param tokens_sold Amount of Tokens sold. # @param min_tokens_bought Minimum Tokens (token_addr) purchased. # @param min_eth_bought Minimum ETH purchased as intermediary. # @param deadline Time after which this transaction can no longer be executed. # @param token_addr The address of the token being purchased. # @return Amount of Tokens (token_addr) bought. @public def tokenToTokenSwapInput(tokens_sold: uint256, min_tokens_bought: uint256, min_eth_bought: uint256(wei), deadline: timestamp, token_addr: address) -> uint256: exchange_addr: address = self.factory.getExchange(token_addr) return self.tokenToTokenInput(tokens_sold, min_tokens_bought, min_eth_bought, deadline, msg.sender, msg.sender, exchange_addr) # @notice Convert Tokens (self.token) to Tokens (token_addr) and transfers # Tokens (token_addr) to recipient. # @dev User specifies exact input and minimum output. # @param tokens_sold Amount of Tokens sold. # @param min_tokens_bought Minimum Tokens (token_addr) purchased. # @param min_eth_bought Minimum ETH purchased as intermediary. # @param deadline Time after which this transaction can no longer be executed. # @param recipient The address that receives output ETH. # @param token_addr The address of the token being purchased. # @return Amount of Tokens (token_addr) bought. @public def tokenToTokenTransferInput(tokens_sold: uint256, min_tokens_bought: uint256, min_eth_bought: uint256(wei), deadline: timestamp, recipient: address, token_addr: address) -> uint256: exchange_addr: address = self.factory.getExchange(token_addr) return self.tokenToTokenInput(tokens_sold, min_tokens_bought, min_eth_bought, deadline, msg.sender, recipient, exchange_addr) @private def tokenToTokenOutput(tokens_bought: uint256, max_tokens_sold: uint256, max_eth_sold: uint256(wei), deadline: timestamp, buyer: address, recipient: address, exchange_addr: address) -> uint256: assert deadline >= block.timestamp and (tokens_bought > 0 and max_eth_sold > 0) assert exchange_addr != self and exchange_addr != ZERO_ADDRESS eth_bought: uint256(wei) = Exchange(exchange_addr).getEthToTokenOutputPrice(tokens_bought) token_reserve: uint256 = self.token.balanceOf(self) tokens_sold: uint256 = self.getOutputPrice(as_unitless_number(eth_bought), token_reserve, as_unitless_number(self.balance)) # tokens sold is always > 0 assert max_tokens_sold >= tokens_sold and max_eth_sold >= eth_bought assert self.token.transferFrom(buyer, self, tokens_sold) eth_sold: uint256(wei) = Exchange(exchange_addr).ethToTokenTransferOutput(tokens_bought, deadline, recipient, value=eth_bought) log.EthPurchase(buyer, tokens_sold, eth_bought) return tokens_sold # @notice Convert Tokens (self.token) to Tokens (token_addr). # @dev User specifies maximum input and exact output. # @param tokens_bought Amount of Tokens (token_addr) bought. # @param max_tokens_sold Maximum Tokens (self.token) sold. # @param max_eth_sold Maximum ETH purchased as intermediary. # @param deadline Time after which this transaction can no longer be executed. # @param token_addr The address of the token being purchased. # @return Amount of Tokens (self.token) sold. @public def tokenToTokenSwapOutput(tokens_bought: uint256, max_tokens_sold: uint256, max_eth_sold: uint256(wei), deadline: timestamp, token_addr: address) -> uint256: exchange_addr: address = self.factory.getExchange(token_addr) return self.tokenToTokenOutput(tokens_bought, max_tokens_sold, max_eth_sold, deadline, msg.sender, msg.sender, exchange_addr) # @notice Convert Tokens (self.token) to Tokens (token_addr) and transfers # Tokens (token_addr) to recipient. # @dev User specifies maximum input and exact output. # @param tokens_bought Amount of Tokens (token_addr) bought. # @param max_tokens_sold Maximum Tokens (self.token) sold. # @param max_eth_sold Maximum ETH purchased as intermediary. # @param deadline Time after which this transaction can no longer be executed. # @param recipient The address that receives output ETH. # @param token_addr The address of the token being purchased. # @return Amount of Tokens (self.token) sold. @public def tokenToTokenTransferOutput(tokens_bought: uint256, max_tokens_sold: uint256, max_eth_sold: uint256(wei), deadline: timestamp, recipient: address, token_addr: address) -> uint256: exchange_addr: address = self.factory.getExchange(token_addr) return self.tokenToTokenOutput(tokens_bought, max_tokens_sold, max_eth_sold, deadline, msg.sender, recipient, exchange_addr) # @notice Convert Tokens (self.token) to Tokens (exchange_addr.token). # @dev Allows trades through contracts that were not deployed from the same factory. # @dev User specifies exact input and minimum output. # @param tokens_sold Amount of Tokens sold. # @param min_tokens_bought Minimum Tokens (token_addr) purchased. # @param min_eth_bought Minimum ETH purchased as intermediary. # @param deadline Time after which this transaction can no longer be executed. # @param exchange_addr The address of the exchange for the token being purchased. # @return Amount of Tokens (exchange_addr.token) bought. @public def tokenToExchangeSwapInput(tokens_sold: uint256, min_tokens_bought: uint256, min_eth_bought: uint256(wei), deadline: timestamp, exchange_addr: address) -> uint256: return self.tokenToTokenInput(tokens_sold, min_tokens_bought, min_eth_bought, deadline, msg.sender, msg.sender, exchange_addr) # @notice Convert Tokens (self.token) to Tokens (exchange_addr.token) and transfers # Tokens (exchange_addr.token) to recipient. # @dev Allows trades through contracts that were not deployed from the same factory. # @dev User specifies exact input and minimum output. # @param tokens_sold Amount of Tokens sold. # @param min_tokens_bought Minimum Tokens (token_addr) purchased. # @param min_eth_bought Minimum ETH purchased as intermediary. # @param deadline Time after which this transaction can no longer be executed. # @param recipient The address that receives output ETH. # @param exchange_addr The address of the exchange for the token being purchased. # @return Amount of Tokens (exchange_addr.token) bought. @public def tokenToExchangeTransferInput(tokens_sold: uint256, min_tokens_bought: uint256, min_eth_bought: uint256(wei), deadline: timestamp, recipient: address, exchange_addr: address) -> uint256: assert recipient != self return self.tokenToTokenInput(tokens_sold, min_tokens_bought, min_eth_bought, deadline, msg.sender, recipient, exchange_addr) # @notice Convert Tokens (self.token) to Tokens (exchange_addr.token). # @dev Allows trades through contracts that were not deployed from the same factory. # @dev User specifies maximum input and exact output. # @param tokens_bought Amount of Tokens (token_addr) bought. # @param max_tokens_sold Maximum Tokens (self.token) sold. # @param max_eth_sold Maximum ETH purchased as intermediary. # @param deadline Time after which this transaction can no longer be executed. # @param exchange_addr The address of the exchange for the token being purchased. # @return Amount of Tokens (self.token) sold. @public def tokenToExchangeSwapOutput(tokens_bought: uint256, max_tokens_sold: uint256, max_eth_sold: uint256(wei), deadline: timestamp, exchange_addr: address) -> uint256: return self.tokenToTokenOutput(tokens_bought, max_tokens_sold, max_eth_sold, deadline, msg.sender, msg.sender, exchange_addr) # @notice Convert Tokens (self.token) to Tokens (exchange_addr.token) and transfers # Tokens (exchange_addr.token) to recipient. # @dev Allows trades through contracts that were not deployed from the same factory. # @dev User specifies maximum input and exact output. # @param tokens_bought Amount of Tokens (token_addr) bought. # @param max_tokens_sold Maximum Tokens (self.token) sold. # @param max_eth_sold Maximum ETH purchased as intermediary. # @param deadline Time after which this transaction can no longer be executed. # @param recipient The address that receives output ETH. # @param token_addr The address of the token being purchased. # @return Amount of Tokens (self.token) sold. @public def tokenToExchangeTransferOutput(tokens_bought: uint256, max_tokens_sold: uint256, max_eth_sold: uint256(wei), deadline: timestamp, recipient: address, exchange_addr: address) -> uint256: assert recipient != self return self.tokenToTokenOutput(tokens_bought, max_tokens_sold, max_eth_sold, deadline, msg.sender, recipient, exchange_addr) # @notice Public price function for ETH to Token trades with an exact input. # @param eth_sold Amount of ETH sold. # @return Amount of Tokens that can be bought with input ETH. @public @constant def getEthToTokenInputPrice(eth_sold: uint256(wei)) -> uint256: assert eth_sold > 0 token_reserve: uint256 = self.token.balanceOf(self) return self.getInputPrice(as_unitless_number(eth_sold), as_unitless_number(self.balance), token_reserve) # @notice Public price function for ETH to Token trades with an exact output. # @param tokens_bought Amount of Tokens bought. # @return Amount of ETH needed to buy output Tokens. @public @constant def getEthToTokenOutputPrice(tokens_bought: uint256) -> uint256(wei): assert tokens_bought > 0 token_reserve: uint256 = self.token.balanceOf(self) eth_sold: uint256 = self.getOutputPrice(tokens_bought, as_unitless_number(self.balance), token_reserve) return as_wei_value(eth_sold, 'wei') # @notice Public price function for Token to ETH trades with an exact input. # @param tokens_sold Amount of Tokens sold. # @return Amount of ETH that can be bought with input Tokens. @public @constant def getTokenToEthInputPrice(tokens_sold: uint256) -> uint256(wei): assert tokens_sold > 0 token_reserve: uint256 = self.token.balanceOf(self) eth_bought: uint256 = self.getInputPrice(tokens_sold, token_reserve, as_unitless_number(self.balance)) return as_wei_value(eth_bought, 'wei') # @notice Public price function for Token to ETH trades with an exact output. # @param eth_bought Amount of output ETH. # @return Amount of Tokens needed to buy output ETH. @public @constant def getTokenToEthOutputPrice(eth_bought: uint256(wei)) -> uint256: assert eth_bought > 0 token_reserve: uint256 = self.token.balanceOf(self) return self.getOutputPrice(as_unitless_number(eth_bought), token_reserve, as_unitless_number(self.balance)) # @return Address of Token that is sold on this exchange. @public @constant def tokenAddress() -> address: return self.token # @return Address of factory that created this exchange. @public @constant def factoryAddress() -> address(Factory): return self.factory # ERC20 compatibility for exchange liquidity modified from # https://github.com/ethereum/vyper/blob/master/examples/tokens/ERC20.vy @public @constant def balanceOf(_owner : address) -> uint256: return self.balances[_owner] @public def transfer(_to : address, _value : uint256) -> bool: self.balances[msg.sender] -= _value self.balances[_to] += _value log.Transfer(msg.sender, _to, _value) return True @public def transferFrom(_from : address, _to : address, _value : uint256) -> bool: self.balances[_from] -= _value self.balances[_to] += _value self.allowances[_from][msg.sender] -= _value log.Transfer(_from, _to, _value) return True @public def approve(_spender : address, _value : uint256) -> bool: self.allowances[msg.sender][_spender] = _value log.Approval(msg.sender, _spender, _value) return True @public @constant def allowance(_owner : address, _spender : address) -> uint256: return self.allowances[_owner][_spender]
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A contract address hosts a smart contract, which is a set of code stored on the blockchain that runs when predetermined conditions are met. Learn more about addresses in our Knowledge Base.