Contract con_pusd_v1_1
| Creator | 6a9004cbc570592c21879e5ee319c754b9b7bf0278878b1cc21ac87eed0ee38d |
| Creation Hash | 66f60c2c6508cac831a768efc18abff996ecad65c6f61bb2a8798297a8472347 |
| Created On | 842 days ago - 12/30/2021, 12:10:07 AM UTC+0 |
Contract Code
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# Python USD - Lamden Fully Decentralized Stable Coin
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# Difference to LUSD is that PUSD is collateralized by TAU on this chain instead of USDT
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# No Slippage Stablecoin Swap available at https://pusd.to
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import currency as tau
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I = importlib
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balances = Hash(default_value=0)
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allowances = Hash(default_value=0)
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metadata = Hash(default_value='')
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total_supply = Variable()
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dapp_state = Variable()
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last_price = Variable()
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@construct
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def seed():
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metadata['token_name'] = "Python USD"
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metadata['token_symbol'] = "PUSD"
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metadata['dex'] = 'con_rocketswap_official_v1_1'
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metadata['lusd'] = 'con_lusd_lst001'
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metadata['dev_addr'] = 'b561090f790569de8cce8f614ebcd2e8c75e2301a027e36159b734b390d39752'
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metadata['dev_tax'] = 1 # Developer tax
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metadata['mnt_tax'] = 1 # Minting tax
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metadata['liq_tax'] = 2 # Liquidity tax
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metadata['anti_manipulation_threshold'] = 7
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metadata['operators'] = [
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'ae7d14d6d9b8443f881ba6244727b69b681010e782d4fe482dbfb0b6aca02d5d',
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'6a9004cbc570592c21879e5ee319c754b9b7bf0278878b1cc21ac87eed0ee38d'
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]
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prices = ForeignHash(foreign_contract=metadata['dex'], foreign_name='prices')
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total_supply.set(0)
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dapp_state.set('active')
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last_price.set(prices[metadata['lusd']])
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@export
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def change_metadata(key: str, value: Any):
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assert key.lower() != 'operators', 'Can not change owners'
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assert value, 'Parameter "value" can not be empty'
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metadata[key, ctx.caller] = value
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owner1 = metadata['operators'][0]
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owner2 = metadata['operators'][1]
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owner1_metadata_change = metadata[key, owner1]
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owner2_metadata_change = metadata[key, owner2]
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if owner1_metadata_change == owner2_metadata_change:
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metadata[key] = value
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metadata[key, owner1] = ''
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metadata[key, owner2] = ''
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assert_owner()
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@export
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def transfer(amount: float, to: str):
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assert amount > 0, 'Cannot send negative balances!'
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assert balances[ctx.caller] >= amount, 'Not enough coins to send!'
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balances[ctx.caller] -= amount
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balances[to] += amount
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@export
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def approve(amount: float, to: str):
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assert amount > 0, 'Cannot send negative balances!'
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allowances[ctx.caller, to] += amount
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@export
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def transfer_from(amount: float, to: str, main_account: str):
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assert amount > 0, 'Cannot send negative balances!'
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assert allowances[main_account, ctx.caller] >= amount, f'You approved {allowances[main_account, ctx.caller]} but need {amount}'
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assert balances[main_account] >= amount, 'Not enough coins to send!'
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allowances[main_account, ctx.caller] -= amount
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balances[main_account] -= amount
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balances[to] += amount
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@export
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def tau_to_pusd(tau_amount: float):
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assert tau_amount > 0, 'Cannot send negative balances!'
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assert dapp_state.get() == 'active', 'The dapp is currently paused'
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prices = ForeignHash(foreign_contract=metadata['dex'], foreign_name='prices')
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price_change = abs(((prices[metadata['lusd']])-last_price.get())/last_price.get())*100
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if (price_change >= metadata['anti_manipulation_threshold']):
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dapp_state.set('inactive')
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else:
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dev_amount = tau_amount / 100 * metadata['dev_tax']
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mnt_amount = tau_amount / 100 * metadata['mnt_tax']
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tau.transfer_from(amount=tau_amount, to=ctx.this, main_account=ctx.caller)
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tau.transfer(amount=dev_amount, to=metadata['dev_addr'])
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pusd_amount = ((tau_amount - dev_amount - mnt_amount) / prices[metadata['lusd']])
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balances[ctx.caller] += pusd_amount
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total_supply.set(total_supply.get() + pusd_amount)
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last_price.set(prices[metadata['lusd']])
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@export
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def pusd_to_tau(pusd_amount: float):
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assert pusd_amount > 0, 'Cannot send negative balances!'
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assert dapp_state.get() == 'active', 'The dapp is currently paused'
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prices = ForeignHash(foreign_contract=metadata['dex'], foreign_name='prices')
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price_change = abs(((prices[metadata['lusd']])-last_price.get())/last_price.get())*100
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if (price_change >= metadata['anti_manipulation_threshold']):
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dapp_state.set('inactive')
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else:
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liq_amount = pusd_amount / 100 * metadata['liq_tax']
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tau_amount = (pusd_amount - liq_amount) * prices[metadata['lusd']]
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tau.transfer(amount=tau_amount, to=ctx.caller)
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balances[ctx.this] += liq_amount
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balances[ctx.caller] -= pusd_amount
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total_supply.set(total_supply.get() - pusd_amount)
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last_price.set(prices[metadata['lusd']])
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if liq_amount >= 10:
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add_liquidity(liq_amount)
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def add_liquidity(pusd_amount: float):
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approve(amount=pusd_amount, to=metadata['dex'])
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tau_amount = I.import_module(metadata['dex']).sell(contract=ctx.this, token_amount=pusd_amount / 2)
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tau.approve(amount=tau_amount, to=metadata['dex'])
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I.import_module(metadata['dex']).add_liquidity(contract=ctx.this, currency_amount=pusd_amount)
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@export
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def unpause_dapp():
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prices = ForeignHash(foreign_contract=metadata['dex'], foreign_name='prices')
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last_price.set(prices[metadata['lusd']])
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dapp_state.set('active')
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assert_owner()
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@export
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def get_current_backing_ratio(): # > 1 = Good
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prices = ForeignHash(foreign_contract=metadata['dex'], foreign_name='prices')
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return ((tau.balance_of(ctx.this) * (1 / prices[metadata['lusd']])) / circulating_supply())
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@export
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def migrate_tau(contract: str, amount: float):
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approved_action('migrate_tau', contract, amount)
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tau.transfer(amount=amount, to=contract, main_account=ctx.this)
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assert_owner()
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@export
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def migrate_pusd(contract: str, amount: float):
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assert amount > 0, 'Cannot send negative balances!'
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assert balances[ctx.this] >= amount, 'Not enough coins to send!'
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approved_action('migrate_pusd', contract, amount)
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balances[ctx.this] -= amount
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balances[contract] += amount
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assert_owner()
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@export
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def migrate_lp(contract: str, amount: float):
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approved_action('migrate_lp', contract, amount)
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dex = I.import_module(metadata['dex'])
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dex.approve_liquidity(ctx.this, contract, amount)
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dex.transfer_liquidity(ctx.this, contract, amount)
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assert_owner()
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def approved_action(action: str, contract: str, amount: float):
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owner1 = metadata['operators'][0]
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owner2 = metadata['operators'][1]
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owner1_action = metadata[action, owner1]
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owner2_action = metadata[action, owner2]
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assert owner1_action == f'{contract},{amount}', f'Wrong metadata for {owner1}'
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assert owner2_action == f'{contract},{amount}', f'Wrong metadata for {owner2}'
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@export
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def circulating_supply():
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return f'{total_supply.get() - balances[ctx.this]}'
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@export
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def total_supply():
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return f'{total_supply.get()}'
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def assert_owner():
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assert ctx.caller in metadata['operators'], 'Only executable by operators!'
Byte Code
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