Stablecoinswap API

Contract is written in Vyper (0.1.0b9)

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addLiquidity
Adding liquidity is free. However, removing liquidity bears the same fee as the swap operation. This is to prevent users from bypassing the trading fee by depositing liquidity in one token and instantly withdrawing it in another token.
Smart Contract
Web3
Smart Contract
def addLiquidity(
    token_address: address, 
    erc20_token_amount: uint256, 
    deadline: timestamp
) -> bool
Web3
contract.methods.addLiquidity(token_address, amount, deadline).send({ from: user_address }, callback)
Parameter
Type
Description
token_address
address
Address of ERC20 token to add
erc20_token_amount
uint256
How many ERC20 tokens to add
deadline
uint256
Transaction deadline
Returns
​
uint256
The amount of STL tokens received by the sender.
removeLiquidity
Smart Contract
Web3
Smart Contract
def removeLiquidity(
    token_address: address, 
    stableswap_token_amount: uint256, 
    erc20_min_output_amount: uint256, 
    deadline: timestamp
) -> bool
Web3
 contract.methods.removeLiquidity(token_address, amount, min_output_amount, deadline).send({ from: user_address }, callback)
Parameter
Type
Description
token_address
address
Address of ERC20 token to remove
stableswap_token_amount
uint256
Amount of STL tokens to redeem
erc20_min_output_amount
uint256
Minimum ERC20 tokens output amount
deadline
uint256
Transaction deadline
Returns
​
uint256
The amount of erc20 tokens received by the sender.
swapTokens
Smart Contract
Web3
Smart Contract
def swapTokens(
    input_token: address,
    output_token: address, 
    erc20_input_amount: uint256, 
    erc20_min_output_amount: uint256, 
    deadline: timestamp
) -> bool
Web3
contract.methods.swapTokens(input_token_address, output_token_address, input_amount, min_output_amount, deadline).send({ from: this.currentAddress() }, callback)
Parameter
Type
Description
input_token
address
Address of input  ERC20 token
output_token
address
Address of output ERC20 token
erc20_input_amount
uint256
Amount of ERC20 input tokens sold
erc20_min_output_amount
uint256
Minimum ERC20 output tokens to buy
deadline
uint256
Transaction deadline
Returns
​
uint256
The amount of erc20 tokens received by the sender.
tokenExchangeRateAfterFees
Smart Contract
Web3
Smart Contract
@constant
def tokenExchangeRateAfterFees(
    input_token_address: address, 
    output_token_address: address
) -> uint256
Web3
contract.methods.tokenExchangeRateAfterFees(input_token_address, output_token_address).call()
Parameter
Type
Description
input_token_address
address
Address of ERC20 token to sell
output_token_address
address
Address of ERC20 token to buy
Returns
​
uint265
Exchange rate multiplied by 10^22.
​
 Note that due to rounding, the fees could be slightly higher for the tokens with smaller decimal precision and/or if the exchange amount is too low.
tokenOutputAmountAfterFees
Smart Contract
Web3
Smart Contract
@constant
def tokenOutputAmountAfterFees(
    input_token_amount: uint256, 
    input_token_address: address, 
    output_token_address: address
) -> uint256
Web3
contract.methods.tokenOutputAmountAfterFees(amount, input_token_address, output_token_address).call()
Parameter
Type
Description
input_token_amount
uint256
Amount of ERC20 token to sell
input_token_address
address
Address of ERC20 token to sell
output_token_address
address
Address of ERC20 token to buy
Returns
​
uint256
How many tokens can be bought for a given amount of input tokens
poolOwnership
Smart Contract
Web3
Smart Contract
@constant
def poolOwnership(user_address: address) -> decimal
Web3
contract.methods.poolOwnership(address).call()
Parameter
Type
Description
user_address
address
Address of a user
Returns
​
fixed168x10 (uint168)
Share of total liquidity belonging to the user
fees
Smart Contract
Web3
Smart Contract
@constant
def fees(fee_name: string[32]) -> decimal
Web3
contract.methods.fees(fee_name).call()
Parameter
Type
Description
fee_name
string
'ownerFee' or 'tradeFee'
Returns
​
fixed168x10 (uint168)
Fee value (i.e. 0.001 means 0.1%)
inputTokens
Smart Contract
Web3
Smart Contract
inputTokens: public(map(address, bool))
Web3
contract.methods.inputTokens(address).call()
Parameter
Type
Description
address
address
Address of ERC20 token
Returns
​
bool
True if an address is in the list of available input tokens
outputTokens
Smart Contract
Web3
Smart Contract
outputTokens: public(map(address, bool))
Web3
contract.methods.outputTokens(address).call()
Parameter
Type
Description
address
address
Address of ERC20 token
Returns
​
bool
True if an address is in the list of available output tokens
priceOracleAddress
Smart Contract
Web3
Smart Contract
priceOracleAddress: public(address)
Web3
contract.methods.priceOracleAddress().call()
Returns
​
address
Address of a priceoracle contract

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Priceoracle API

Last updated 9 months ago

Parameter	Type	Description
token_address	address	Address of ERC20 token to add
erc20_token_amount	uint256	How many ERC20 tokens to add
deadline	uint256	Transaction deadline

Returns
uint256	The amount of STL tokens received by the sender.

Returns
uint256	The amount of erc20 tokens received by the sender.

Returns
uint256	How many tokens can be bought for a given amount of input tokens

Returns
fixed168x10 (uint168)	Share of total liquidity belonging to the user

Returns
fixed168x10 (uint168)	Fee value (i.e. 0.001 means 0.1%)

Returns
bool	True if an address is in the list of available input tokens