1inch on-chain DeFi aggregation protocol

First ever fully on-chain DEX aggregator protocol by 1inch

Integration

Latest version is always accessible at 1split.eth (beta on 1proto.eth)

Start with checking out solidity interface: IOneSplit.sol

How it works

This smart contract allows to get best price for tokens by aggregating prices from several DEXes.

So far the service works with 2 types of exchages: split and wrap.

List of split exchanges:

let splitExchanges = [
    "Uniswap",
    "Kyber",
    "Bancor",
    "Oasis",
    "Curve Compound",
    "Curve USDT",
    "Curve Y",
    "Curve Binance",
    "Curve Synthetix",
    "Uniswap Compound",
    "Uniswap CHAI",
    "Uniswap Aave",
    "Mooniswap",
    "Uniswap V2",
    "Uniswap V2 ETH",
    "Uniswap V2 DAI",
    "Uniswap V2 USDC",
    "Curve Pax",
    "Curve renBTC",
    "Curve tBTC",
    "Dforce XSwap",
    "Shell",
    "mStable mUSD",
    "Curve sBTC",
    "Balancer 1",
    "Balancer 2",
    "Balancer 3",
    "Kyber 1",
    "Kyber 2",
    "Kyber 3",
    "Kyber 4"
]

List of wrap exchanges:

let wrapExchanges = [
    "CHAI",
    "BDAI",
    "Aave",
    "Fulcrum",
    "Compound",
    "Iearn",
    "Idle",
    "WETH",
    "mUSD"
]

How to use it

To use this service you have to call methods at OneSplitAudit

To swap tokens you have to figure out way from left to right points by one of paths on scheme above.

For example, first of all call method getExpectedReturn (see methods section), it returns distribution array. Each element of this array matches element of splitExchanges (see above) and represents fraction of trading volume.
Then call getExpectedReturnWithGas to take into account gas when splitting. This method returns more profitable distribution array for exchange.
Then call method swap or swapWithReferral (see methods section) with param distribution which was recieved earlier from method getExpectedReturn.

Swap may be customized by flags (see flags section). There are 2 types of swap: direct swap and swap over transitional token.

In case of direct swap each element of distribution array matches element of splitExchanges and represents fraction of trading off token as alerady described above.

In case of swap with transitional token each element of distribution (256 bits) matches 2 swaps: second bytes are equal to swap to transitional token, lowest bytes are equal to swap to the desired token.

Supported DEXes

Methods

If you need Ether instead of any token use address(0) or address(0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE) as param fromToken/destToken

getExpectedReturn

function getExpectedReturn(
    IERC20 fromToken,
    IERC20 destToken,
    uint256 amount,
    uint256 parts,
    uint256 flags
)
    public
    view
    returns(
        uint256 returnAmount,
        uint256[] memory distribution
    )

Calculate expected returning amount of desired token

Params	Type	Description
fromToken	IERC20	Address of trading off token
destToken	IERC20	Address of desired token
amount	uint256	Amount for `fromToken`
parts	uint256	Number of pieces source volume could be splitted (Works like granularity, higly affects gas usage. Should be called offchain, but could be called onchain if user swaps not his own funds, but this is still considered as not safe)
flags	uint256	Flags for enabling and disabling some features (default: `0`), see flags description

Return values:

Params	Type	Description
returnAmount	uint256	Expected returning amount of desired token
distribution	uint256[]	Array of weights for volume distribution

Notice: This method is equal to getExpectedReturnWithGas(fromToken, destToken, amount, parts, flags, 0)

Example:

let Web3 = require('web3')

let provider = new Web3.providers.WebsocketProvider('wss://mainnet.infura.io/ws/v3/YOUR_TOKEN')
let web3 = new Web3(provider)

let ABI = [{"inputs":[{"internalType":"contract IOneSplitMulti","name":"impl","type":"address"}],"payable":false,"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"newImpl","type":"address"}],"name":"ImplementationUpdated","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"previousOwner","type":"address"},{"indexed":true,"internalType":"address","name":"newOwner","type":"address"}],"name":"OwnershipTransferred","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"contract IERC20","name":"fromToken","type":"address"},{"indexed":true,"internalType":"contract IERC20","name":"destToken","type":"address"},{"indexed":false,"internalType":"uint256","name":"fromTokenAmount","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"destTokenAmount","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"minReturn","type":"uint256"},{"indexed":false,"internalType":"uint256[]","name":"distribution","type":"uint256[]"},{"indexed":false,"internalType":"uint256[]","name":"flags","type":"uint256[]"},{"indexed":false,"internalType":"address","name":"referral","type":"address"},{"indexed":false,"internalType":"uint256","name":"feePercent","type":"uint256"}],"name":"Swapped","type":"event"},{"payable":true,"stateMutability":"payable","type":"fallback"},{"constant":true,"inputs":[],"name":"chi","outputs":[{"internalType":"contract IFreeFromUpTo","name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"internalType":"contract IERC20","name":"asset","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"claimAsset","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[{"internalType":"contract IERC20","name":"fromToken","type":"address"},{"internalType":"contract IERC20","name":"destToken","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"},{"internalType":"uint256","name":"parts","type":"uint256"},{"internalType":"uint256","name":"flags","type":"uint256"}],"name":"getExpectedReturn","outputs":[{"internalType":"uint256","name":"returnAmount","type":"uint256"},{"internalType":"uint256[]","name":"distribution","type":"uint256[]"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"internalType":"contract IERC20","name":"fromToken","type":"address"},{"internalType":"contract IERC20","name":"destToken","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"},{"internalType":"uint256","name":"parts","type":"uint256"},{"internalType":"uint256","name":"flags","type":"uint256"},{"internalType":"uint256","name":"destTokenEthPriceTimesGasPrice","type":"uint256"}],"name":"getExpectedReturnWithGas","outputs":[{"internalType":"uint256","name":"returnAmount","type":"uint256"},{"internalType":"uint256","name":"estimateGasAmount","type":"uint256"},{"internalType":"uint256[]","name":"distribution","type":"uint256[]"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"internalType":"contract IERC20[]","name":"tokens","type":"address[]"},{"internalType":"uint256","name":"amount","type":"uint256"},{"internalType":"uint256[]","name":"parts","type":"uint256[]"},{"internalType":"uint256[]","name":"flags","type":"uint256[]"},{"internalType":"uint256[]","name":"destTokenEthPriceTimesGasPrices","type":"uint256[]"}],"name":"getExpectedReturnWithGasMulti","outputs":[{"internalType":"uint256[]","name":"returnAmounts","type":"uint256[]"},{"internalType":"uint256","name":"estimateGasAmount","type":"uint256"},{"internalType":"uint256[]","name":"distribution","type":"uint256[]"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"isOwner","outputs":[{"internalType":"bool","name":"","type":"bool"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"oneSplitImpl","outputs":[{"internalType":"contract IOneSplitMulti","name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[],"name":"renounceOwnership","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"internalType":"contract IOneSplitMulti","name":"impl","type":"address"}],"name":"setNewImpl","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"internalType":"contract IERC20","name":"fromToken","type":"address"},{"internalType":"contract IERC20","name":"destToken","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"},{"internalType":"uint256","name":"minReturn","type":"uint256"},{"internalType":"uint256[]","name":"distribution","type":"uint256[]"},{"internalType":"uint256","name":"flags","type":"uint256"}],"name":"swap","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"payable":true,"stateMutability":"payable","type":"function"},{"constant":false,"inputs":[{"internalType":"contract IERC20[]","name":"tokens","type":"address[]"},{"internalType":"uint256","name":"amount","type":"uint256"},{"internalType":"uint256","name":"minReturn","type":"uint256"},{"internalType":"uint256[]","name":"distribution","type":"uint256[]"},{"internalType":"uint256[]","name":"flags","type":"uint256[]"}],"name":"swapMulti","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"payable":true,"stateMutability":"payable","type":"function"},{"constant":false,"inputs":[{"internalType":"contract IERC20","name":"fromToken","type":"address"},{"internalType":"contract IERC20","name":"destToken","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"},{"internalType":"uint256","name":"minReturn","type":"uint256"},{"internalType":"uint256[]","name":"distribution","type":"uint256[]"},{"internalType":"uint256","name":"flags","type":"uint256"},{"internalType":"address","name":"referral","type":"address"},{"internalType":"uint256","name":"feePercent","type":"uint256"}],"name":"swapWithReferral","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"payable":true,"stateMutability":"payable","type":"function"},{"constant":false,"inputs":[{"internalType":"contract IERC20[]","name":"tokens","type":"address[]"},{"internalType":"uint256","name":"amount","type":"uint256"},{"internalType":"uint256","name":"minReturn","type":"uint256"},{"internalType":"uint256[]","name":"distribution","type":"uint256[]"},{"internalType":"uint256[]","name":"flags","type":"uint256[]"},{"internalType":"address","name":"referral","type":"address"},{"internalType":"uint256","name":"feePercent","type":"uint256"}],"name":"swapWithReferralMulti","outputs":[{"internalType":"uint256","name":"returnAmount","type":"uint256"}],"payable":true,"stateMutability":"payable","type":"function"},{"constant":false,"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"}]
let CONTRACT_ADDRESS = "0xC586BeF4a0992C495Cf22e1aeEE4E446CECDee0E"

let contract = new web3.eth.Contract(ABI, CONTRACT_ADDRESS)
contract.methods.getExpectedReturn(
    "0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE",
    "0x89d24a6b4ccb1b6faa2625fe562bdd9a23260359",
    100,
    10, 
    0
).call().then(data => {
    console.log(`returnAmount: ${data.returnAmount.toString()}`)
    console.log(`distribution: ${JSON.stringify(data.distribution)}`)
}).catch(error => {
    // TO DO: ...
});

getExpectedReturnWithGas

function getExpectedReturnWithGas(
    IERC20 fromToken,
    IERC20 destToken,
    uint256 amount,
    uint256 parts,
    uint256 flags,
    uint256 destTokenEthPriceTimesGasPrice
)
    public
    view
    returns(
        uint256 returnAmount,
        uint256 estimateGasAmount,
        uint256[] memory distribution
    )

Calculate expected returning amount of desired token taking into account how gas protocols affect price

Params	Type	Description
fromToken	IERC20	Address of trading off token
destToken	IERC20	Address of desired token
amount	uint256	Amount for `fromToken`
parts	uint256	Number of pieces source volume could be splitted (Works like granularity, higly affects gas usage. Should be called offchain, but could be called onchain if user swaps not his own funds, but this is still considered as not safe)
flags	uint256	Flags for enabling and disabling some features (default: `0`), see flags description
destTokenEthPriceTimesGasPrice	uint256	`returnAmount * gas_price`, where `returnAmount` is result of `getExpectedReturn(fromToken, destToken, amount, parts, flags)`

Return values:

Params	Type	Description
returnAmount	uint256	Expected returning amount of desired token
estimateGasAmount	uint256	Expected gas amount of exchange
distribution	uint256[]	Array of weights for volume distribution

Example:

 // TO DO: ...

getExpectedReturnWithGasMulti

function getExpectedReturnWithGasMulti(
    IERC20[] memory tokens,
    uint256 amount,
    uint256[] memory parts,
    uint256[] memory flags,
    uint256[] memory destTokenEthPriceTimesGasPrices
)
    public
    view
    returns(
        uint256[] memory returnAmounts,
        uint256 estimateGasAmount,
        uint256[] memory distribution
    )

Calculate expected returning amount of first tokens element to last tokens element through and the middle tokens with corresponding parts, flags and destTokenEthPriceTimesGasPrices array values of each step.
The length of each array (parts, flags and destTokenEthPriceTimesGasPrices) should be 1 element less than tokens array length. Each element from parts, flags and destTokenEthPriceTimesGasPrices corresponds to 2 neighboring elements from tokens array.

Params	Type	Description
tokens	IERC20[]	The sequence of tokens swaps (`tokens[0] -> tokens[1] -> ...`)
amount	uint256	Amount for `tokens[0]`
parts	uint256[]	The sequence of number of pieces source volume could be splitted (Works like granularity, higly affects gas usage. Should be called offchain, but could be called onchain if user swaps not his own funds, but this is still considered as not safe)
flags	uint256[]	The sequence of flags for enabling and disabling some features (default: `0`), see flags description
destTokenEthPriceTimesGasPrice	uint256[]	The sequence of numbers `returnAmount * gas_price`, where `returnAmount` is result of `getExpectedReturn(fromToken, destToken, amount, parts, flags)`

Return values:

Params	Type	Description
returnAmount	uint256[]	Expected returning amounts of desired tokens in `tokens` array
estimateGasAmount	uint256	Expected gas amount of exchange
distribution	uint256[]	Array of weights for volume distribution

Example:

 // TO DO: ...

swap

function swap(
    IERC20 fromToken,
    IERC20 destToken,
    uint256 amount,
    uint256 minReturn,
    uint256[] memory distribution,
    uint256 flags
) public payable returns(uint256)

Swap amount of fromToken to destToken

Params	Type	Description
fromToken	IERC20	Address of trading off token
destToken	IERC20	Address of desired token
amount	uint256	Amount for `fromToken`
minReturn	uint256	Minimum expected return, else revert transaction
distribution	uint256[]	Array of weights for volume distribution (returned by `getExpectedReturn`)
flags	uint256	Flags for enabling and disabling some features (default: `0`), see flags description

Notice: Make sure the flags param coincides flags param in getExpectedReturn method if you want the same result

Notice: This method is equal to swapWithReferral(fromToken, destToken, amount, minReturn, distribution, flags, address(0), 0)

Return values:

Params	Type	Description
returnAmount	uint256	Recieved amount of desired token

Example:

 // TO DO: ...

swapMulti

function swapMulti(
    IERC20[] memory tokens,
    uint256 amount,
    uint256 minReturn,
    uint256[] memory distribution,
    uint256[] memory flags
) public payable returns(uint256)

Swap amount of first element of tokens to the latest element.
The length of flags array should be 1 element less than tokens array length. Each element from flags array corresponds to 2 neighboring elements from tokens array.

Params	Type	Description
tokens	IERC20[]	Addresses of tokens or `address(0)` for Ether
amount	uint256	Amount for `tokens[0]`
minReturn	uint256	Minimum expected return, else revert transaction
distribution	uint256[]	Array of weights for volume distribution (returned by `getExpectedReturn`)
flags	uint256[]	The sequence of flags for enabling and disabling some features (default: `0`), see flags description

Notice: Make sure the flags param coincides flags param in getExpectedReturnWithGasMulti method if you want the same result

Notice: This method is equal to swapWithReferralMulti(fromToken, destToken, amount, minReturn, distribution, flags, address(0), 0)

Return values:

Params	Type	Description
returnAmount	uint256	Recieved amount of desired token

Example:

 // TO DO: ...

swapWithReferral

function swapWithReferral(
    IERC20 fromToken,
    IERC20 destToken,
    uint256 amount,
    uint256 minReturn,
    uint256[] memory distribution,
    uint256 flags,
    address referral,
    uint256 feePercent
) public payable returns(uint256)

Swap amount of fromToken to destToken

Params	Type	Description
fromToken	IERC20	Address of trading off token
destToken	IERC20	Address of desired token
amount	uint256	Amount for `fromToken`
minReturn	uint256	Minimum expected return, else revert transaction
distribution	uint256[]	Array of weights for volume distribution (returned by `getExpectedReturn`)
flags	uint256	Flags for enabling and disabling some features (default: `0`), see flags description
referral	address	Referrer's address (exception with flag `FLAG_ENABLE_REFERRAL_GAS_SPONSORSHIP`)
feePercent	uint256	Fees percents normalized to 1e18, limited to 0.03e18 (3%)

Notice: Make sure the flags param coincides flags param in getExpectedReturn method if you want the same result

Return values:

Params	Type	Description
returnAmount	uint256	Recieved amount of desired token

Example:

 // TO DO: ...

swapWithReferralMulti

function swapWithReferralMulti(
    IERC20[] memory tokens,
    uint256 amount,
    uint256 minReturn,
    uint256[] memory distribution,
    uint256[] memory flags,
    address referral,
    uint256 feePercent
) public payable returns(uint256 returnAmount)

Swap amount of first element of tokens to the latest element.
The length of flags array should be 1 element less than tokens array length. Each element from flags array corresponds to 2 neighboring elements from tokens array.

Params	Type	Description
tokens	IERC20[]	Addresses of tokens or `address(0)` for Ether
amount	uint256	Amount for `tokens[0]`
minReturn	uint256	Minimum expected return, else revert transaction
distribution	uint256[]	Array of weights for volume distribution (returned by `getExpectedReturn`)
flags	uint256[]	The sequence of flags for enabling and disabling some features (default: `0`), see flags description
referral	address	Referrer's address (exception with flag `FLAG_ENABLE_REFERRAL_GAS_SPONSORSHIP`)
feePercent	uint256	Fees percents normalized to 1e18, limited to 0.03e18 (3%)

Notice: Make sure the flags param coincides flags param in getExpectedReturnWithGasMulti method if you want the same result

Return values:

Params	Type	Description
returnAmount	uint256	Recieved amount of desired token

Example:

 // TO DO: ...

makeGasDiscount

function makeGasDiscount(
    uint256 gasSpent,
    uint256 returnAmount,
    bytes calldata msgSenderCalldata
)

In case developer wants to manage burning GAS or CHI tokens with developer's own smartcontract one should implement this method and use FLAG_ENABLE_REFERRAL_GAS_SPONSORSHIP flag. 1proto.eth will call makeGasDiscount in developer's smartcontract.

Params	Type	Description
gasSpent	uint256	How many gas was spent
returnAmount	uint256	Recieved amount of desired token
msgSenderCalldata	bytes	Arguments from `swap`, `swapWithReferral` or `swapWithReferralMulti` method

Notice: There is no such method in 1proto.eth.

Flags

Flag types

There are basically 3 types of flags:

Exchange switch
This flags allow 1split.eth to enable or disable using exchange pools for swap. This can be applied for exchanges in genereral, for example: split, wrap, or this can be applied for a specific exchange type, for example: bancor, oasis.
This flags may be used in any combination.
Transitional token selector
This flags provide to swap from fromToken to destToken using transitional token.
This flags cann't be used in combination with the same type.
Functional flags
This flags provide some additional features.
This flags may be used in any combination.

Flags description

flags param in 1split.eth methods is sum of flags values, for example:

flags = FLAG_DISABLE_UNISWAP + FLAG_DISABLE_KYBER + ...

Exchange switch (Split exchanges)

Flag	Value	Description
FLAG_DISABLE_UNISWAP	`0x01`	Exclude `Uniswap` exchange from swap
FLAG_ENABLE_KYBER_UNISWAP_RESERVE	`0x100000000`	Permit `Kyber` use `Uniswap`, by default it is forbidden
FLAG_ENABLE_KYBER_OASIS_RESERVE	`0x200000000`	Permit `Kyber` use `Oasis`, by default it is forbidden
FLAG_ENABLE_KYBER_BANCOR_RESERVE	`0x400000000`	Permit `Kyber` use `Bancor`, by default it is forbidden
FLAG_DISABLE_BANCOR	`0x04`	Exclude `Bancor` exchange from swap
FLAG_DISABLE_OASIS	`0x08`	Exclude `Oasis` exchange from swap
FLAG_DISABLE_CURVE_COMPOUND	`0x1000`	Exclude `CurveCompound` exchange from swap
FLAG_DISABLE_CURVE_USDT	`0x2000`	Exclude `CurveUsdt` exchange from swap
FLAG_DISABLE_CURVE_Y	`0x4000`	Exclude `CurveY` exchange from swap
FLAG_DISABLE_CURVE_BINANCE	`0x8000`	Exclude `CurveBinance` exchange from swap
FLAG_DISABLE_CURVE_SYNTHETIX	`0x40000`	Exclude `CurveSynthetix` exchange from swap
FLAG_DISABLE_UNISWAP_COMPOUND	`0x100000`	Forbid `Uniswap` use `Compound`, by default it is permitted. Works only when one of assets is `ETH`
FLAG_DISABLE_UNISWAP_CHAI	`0x200000`	Forbid `Uniswap` use `Chai`, by default it is permitted. Works only when `ETH<>DAI`
FLAG_DISABLE_UNISWAP_AAVE	`0x400000`	Forbid `Uniswap` use `Aave`, by default it is permitted. Works only when one of assets is `ETH`
FLAG_DISABLE_MOONISWAP	`0x1000000`	Exclude `Mooniswap` exchange from swap
FLAG_DISABLE_UNISWAP_V2_ALL	`0x1E000000`	Exclude all exchanges with `UniswapV2` prefix from swap
FLAG_DISABLE_UNISWAP_V2	`0x2000000`	Exclude `UniswapV2` exchange from swap
FLAG_DISABLE_UNISWAP_V2_ETH	`0x4000000`	Exclude `UniswapV2ETH` exchange from swap
FLAG_DISABLE_UNISWAP_V2_DAI	`0x8000000`	Exclude `UniswapV2DAI` exchange from swap
FLAG_DISABLE_UNISWAP_V2_USDC	`0x10000000`	Exclude `UniswapV2USDC` exchange from swap
FLAG_DISABLE_ALL_SPLIT_SOURCES	`0x20000000`	Exclude all `split` exchages from swap. Inverts `split` tokens flag values
FLAG_DISABLE_CURVE_PAX	`0x80000000`	Exclude `CurvePax` exchange from swap
FLAG_DISABLE_CURVE_RENBTC	`0x100000000`	Exclude `CurveRenBtc` exchange from swap
FLAG_DISABLE_CURVE_TBTC	`0x200000000`	Exclude `CurveTBtc` exchange from swap
FLAG_DISABLE_DFORCE_SWAP	`0x4000000000`	Exclude `DforceSwap` exchange from swap
FLAG_DISABLE_SHELL	`0x8000000000`	Exclude `Shellexchangers` exchange from swap
FLAG_DISABLE_MSTABLE_MUSD	`0x20000000000`	Exclude pool `MUSD` in `mStable` exchange from swap
FLAG_DISABLE_CURVE_SBTC	`0x40000000000`	Exclude pool `SBTC` in `Curve` exchange from swap
FLAG_DISABLE_DMM	`0x80000000000`	Exclude `DMM` exchange from swap
FLAG_DISABLE_UNISWAP_ALL	`0x100000000000`	Exclude all pools in `Uniswap` exchange from swap
FLAG_DISABLE_CURVE_ALL	`0x200000000000`	Exclude all pools in `Curve` exchange from swap
FLAG_DISABLE_BALANCER_ALL	`0x1000000000000`	Exclude all pools in `Balancer` exchange from swap
FLAG_DISABLE_BALANCER_1	`0x2000000000000`	Exclude the first best pool in `Balancer` exchange from swap
FLAG_DISABLE_BALANCER_2	`0x4000000000000`	Exclude the second best pool in `Balancer` exchange from swap
FLAG_DISABLE_BALANCER_3	`0x8000000000000`	Exclude the third best pool in `Balancer` exchange from swap
FLAG_DISABLE_KYBER_ALL	`0x200000000000000`	Exclude all pools in `Kyber` exchange from swap
FLAG_DISABLE_KYBER_1	`0x400000000000000`	Exclude the first multi-token `Kyber` reserve (exchange of any token to any is possible) from swap (see KyberReserves)
FLAG_DISABLE_KYBER_2	`0x800000000000000`	Exclude the second multi-token `Kyber` reserve (exchange of any token to any is possible) from swap (see KyberReserves)
FLAG_DISABLE_KYBER_3	`0x1000000000000000`	Exclude the third multi-token `Kyber` reserve (exchange of any token to any is possible) from swap (see KyberReserves)
FLAG_DISABLE_KYBER_4	`0x2000000000000000`	Exclude the single-token `Kyber` reserve (single-token reserves does not intersect and the one that fits is selected) from swap (see KyberReserves)

Example:

let Web3 = require('web3')

let provider = new Web3.providers.WebsocketProvider('wss://mainnet.infura.io/ws/v3/YOUR_TOKEN')
let web3 = new Web3(provider)

let ABI = [{"inputs":[{"internalType":"contract IOneSplitMulti","name":"impl","type":"address"}],"payable":false,"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"newImpl","type":"address"}],"name":"ImplementationUpdated","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"previousOwner","type":"address"},{"indexed":true,"internalType":"address","name":"newOwner","type":"address"}],"name":"OwnershipTransferred","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"contract IERC20","name":"fromToken","type":"address"},{"indexed":true,"internalType":"contract IERC20","name":"destToken","type":"address"},{"indexed":false,"internalType":"uint256","name":"fromTokenAmount","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"destTokenAmount","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"minReturn","type":"uint256"},{"indexed":false,"internalType":"uint256[]","name":"distribution","type":"uint256[]"},{"indexed":false,"internalType":"uint256[]","name":"flags","type":"uint256[]"},{"indexed":false,"internalType":"address","name":"referral","type":"address"},{"indexed":false,"internalType":"uint256","name":"feePercent","type":"uint256"}],"name":"Swapped","type":"event"},{"payable":true,"stateMutability":"payable","type":"fallback"},{"constant":true,"inputs":[],"name":"chi","outputs":[{"internalType":"contract IFreeFromUpTo","name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"internalType":"contract IERC20","name":"asset","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"claimAsset","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[{"internalType":"contract IERC20","name":"fromToken","type":"address"},{"internalType":"contract IERC20","name":"destToken","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"},{"internalType":"uint256","name":"parts","type":"uint256"},{"internalType":"uint256","name":"flags","type":"uint256"}],"name":"getExpectedReturn","outputs":[{"internalType":"uint256","name":"returnAmount","type":"uint256"},{"internalType":"uint256[]","name":"distribution","type":"uint256[]"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"internalType":"contract IERC20","name":"fromToken","type":"address"},{"internalType":"contract IERC20","name":"destToken","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"},{"internalType":"uint256","name":"parts","type":"uint256"},{"internalType":"uint256","name":"flags","type":"uint256"},{"internalType":"uint256","name":"destTokenEthPriceTimesGasPrice","type":"uint256"}],"name":"getExpectedReturnWithGas","outputs":[{"internalType":"uint256","name":"returnAmount","type":"uint256"},{"internalType":"uint256","name":"estimateGasAmount","type":"uint256"},{"internalType":"uint256[]","name":"distribution","type":"uint256[]"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"internalType":"contract IERC20[]","name":"tokens","type":"address[]"},{"internalType":"uint256","name":"amount","type":"uint256"},{"internalType":"uint256[]","name":"parts","type":"uint256[]"},{"internalType":"uint256[]","name":"flags","type":"uint256[]"},{"internalType":"uint256[]","name":"destTokenEthPriceTimesGasPrices","type":"uint256[]"}],"name":"getExpectedReturnWithGasMulti","outputs":[{"internalType":"uint256[]","name":"returnAmounts","type":"uint256[]"},{"internalType":"uint256","name":"estimateGasAmount","type":"uint256"},{"internalType":"uint256[]","name":"distribution","type":"uint256[]"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"isOwner","outputs":[{"internalType":"bool","name":"","type":"bool"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"oneSplitImpl","outputs":[{"internalType":"contract IOneSplitMulti","name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[],"name":"renounceOwnership","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"internalType":"contract IOneSplitMulti","name":"impl","type":"address"}],"name":"setNewImpl","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"internalType":"contract IERC20","name":"fromToken","type":"address"},{"internalType":"contract IERC20","name":"destToken","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"},{"internalType":"uint256","name":"minReturn","type":"uint256"},{"internalType":"uint256[]","name":"distribution","type":"uint256[]"},{"internalType":"uint256","name":"flags","type":"uint256"}],"name":"swap","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"payable":true,"stateMutability":"payable","type":"function"},{"constant":false,"inputs":[{"internalType":"contract IERC20[]","name":"tokens","type":"address[]"},{"internalType":"uint256","name":"amount","type":"uint256"},{"internalType":"uint256","name":"minReturn","type":"uint256"},{"internalType":"uint256[]","name":"distribution","type":"uint256[]"},{"internalType":"uint256[]","name":"flags","type":"uint256[]"}],"name":"swapMulti","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"payable":true,"stateMutability":"payable","type":"function"},{"constant":false,"inputs":[{"internalType":"contract IERC20","name":"fromToken","type":"address"},{"internalType":"contract IERC20","name":"destToken","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"},{"internalType":"uint256","name":"minReturn","type":"uint256"},{"internalType":"uint256[]","name":"distribution","type":"uint256[]"},{"internalType":"uint256","name":"flags","type":"uint256"},{"internalType":"address","name":"referral","type":"address"},{"internalType":"uint256","name":"feePercent","type":"uint256"}],"name":"swapWithReferral","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"payable":true,"stateMutability":"payable","type":"function"},{"constant":false,"inputs":[{"internalType":"contract IERC20[]","name":"tokens","type":"address[]"},{"internalType":"uint256","name":"amount","type":"uint256"},{"internalType":"uint256","name":"minReturn","type":"uint256"},{"internalType":"uint256[]","name":"distribution","type":"uint256[]"},{"internalType":"uint256[]","name":"flags","type":"uint256[]"},{"internalType":"address","name":"referral","type":"address"},{"internalType":"uint256","name":"feePercent","type":"uint256"}],"name":"swapWithReferralMulti","outputs":[{"internalType":"uint256","name":"returnAmount","type":"uint256"}],"payable":true,"stateMutability":"payable","type":"function"},{"constant":false,"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"}]
let CONTRACT_ADDRESS = "0xC586BeF4a0992C495Cf22e1aeEE4E446CECDee0E"

let splitExchanges = [
    "Uniswap", "Kyber", "Bancor", "Oasis", "CurveCompound", "CurveUsdt", "CurveY", "CurveBinance", "CurveSynthetix", "UniswapCompound", "UniswapChai", "UniswapAave", "Mooniswap", "UniswapV2", "UniswapV2ETH", "UniswapV2DAI", "UniswapV2USDC", "CurvePax", "CurveRenBtc", "CurveTBtc", "DforceSwap", "Shellexchangers"
]

let parts = 10

let contract = new web3.eth.Contract(ABI, CONTRACT_ADDRESS)
contract.methods.getExpectedReturn(
    "0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE",
    "0x89d24a6b4ccb1b6faa2625fe562bdd9a23260359",
    100,
    parts, 
    0x04
).call().then(data => {

    data.distribution.forEach(function(value, index) {
        console.log(`${splitExchanges[index]}: ${value*100/parts}%`)
    })
}).catch(error => {
    // TO DO: ...
});

Exchange switch (Wrap exchanges)

Flag	Value	Description
FLAG_DISABLE_COMPOUND	`0x10`	Exclude `Compound` exchange from swap
FLAG_DISABLE_FULCRUM	`0x20`	Exclude `Fulcrum` exchange from swap
FLAG_DISABLE_CHAI	`0x40`	Exclude `Chai` exchange from swap
FLAG_DISABLE_AAVE	`0x80`	Exclude `Aave` exchange from swap
FLAG_DISABLE_SMART_TOKEN	`0x100`	Exclude `SmartToken` exchange from swap
FLAG_DISABLE_BDAI	`0x400`	Exclude `Bdai` exchange from swap
FLAG_DISABLE_IEARN	`0x800`	Exclude `Iearn` exchange from swap
FLAG_DISABLE_WETH	`0x80000`	Exclude `Weth` exchange from swap
FLAG_DISABLE_IDLE	`0x800000`	Exclude `Idle` exchange from swap
FLAG_DISABLE_ALL_WRAP_SOURCES	`0x40000000`	Exclude all `wrap` exchages from swap. Inverts `wrap` tokens flag values

Transitional token selector

Flag	Value	Description
FLAG_DISABLE_UNISWAP_COMPOUND	`0x100000`	Exclude `Uniswap` pools with `cTokens`
FLAG_DISABLE_UNISWAP_CHAI	`0x200000`	Exclude `Uniswap` pools with `Chai`
FLAG_DISABLE_UNISWAP_AAVE	`0x400000`	Exclude `Uniswap` pools with `aTokens`

Functional flags

Flag	Value	Description
FLAG_ENABLE_CHI_BURN	`0x10000000000`	Burns `CHI` token to save gas. Make sure to approve `CHI` token to `1split.eth` smart contract
FLAG_ENABLE_CHI_BURN_BY_ORIGIN	`0x4000000000000000`	This flag extends the functionality of `FLAG_ENABLE_CHI_BURN` flag. Burns `CHI` token from address which sign swap transaction instead of address which call swap method
FLAG_ENABLE_REFERRAL_GAS_SPONSORSHIP	`0x80000000000000`	Turning on this flag means that parameter `referral` (methods `swapWithReferral` and `swapWithReferralMulti`) matches the address of the user smartcontract which has `makeGasDiscount` method. So this method can burn `GAS` token, `CHI` token by itself or it can add other functionality.

Name		Name	Last commit message	Last commit date
Latest commit History 244 Commits
contracts		contracts
img		img
migrations		migrations
scripts		scripts
test		test
.editorconfig		.editorconfig
.eslintignore		.eslintignore
.eslintrc		.eslintrc
.gitattributes		.gitattributes
.gitignore		.gitignore
.prettierignore		.prettierignore
.prettierrc		.prettierrc
.solcover.js		.solcover.js
.soliumignore		.soliumignore
.soliumrc.json		.soliumrc.json
.travis.yml		.travis.yml
AaveRegistry.full.abi		AaveRegistry.full.abi
AaveRegistry.full.bin		AaveRegistry.full.bin
AaveRegistry.full.sol		AaveRegistry.full.sol
BalancerHelper.full.abi		BalancerHelper.full.abi
BalancerHelper.full.bin		BalancerHelper.full.bin
BalancerHelper.full.sol		BalancerHelper.full.sol
BancorFinder.full.abi		BancorFinder.full.abi
BancorFinder.full.bin		BancorFinder.full.bin
BancorFinder.full.sol		BancorFinder.full.sol
CompoundRegistry.full.abi		CompoundRegistry.full.abi
CompoundRegistry.full.bin		CompoundRegistry.full.bin
CompoundRegistry.full.sol		CompoundRegistry.full.sol
KyberReserves.md		KyberReserves.md
LICENSE		LICENSE
OneSplit.full.abi		OneSplit.full.abi
OneSplit.full.bin		OneSplit.full.bin
OneSplit.full.sol		OneSplit.full.sol
OneSplitAudit.full.abi		OneSplitAudit.full.abi
OneSplitAudit.full.bin		OneSplitAudit.full.bin
OneSplitAudit.full.sol		OneSplitAudit.full.sol
OneSplitView.full.abi		OneSplitView.full.abi
OneSplitView.full.bin		OneSplitView.full.bin
OneSplitView.full.sol		OneSplitView.full.sol
README.md		README.md
package.json		package.json
solhint.json		solhint.json
truffle-config.js		truffle-config.js
yarn.lock		yarn.lock

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1inch on-chain DeFi aggregation protocol

Integration

How it works

How to use it

Supported DEXes

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getExpectedReturn

getExpectedReturnWithGas

getExpectedReturnWithGasMulti

swap

swapMulti

swapWithReferral

swapWithReferralMulti

makeGasDiscount

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1inch on-chain DeFi aggregation protocol

Integration

How it works

How to use it

Supported DEXes

Methods

getExpectedReturn

getExpectedReturnWithGas

getExpectedReturnWithGasMulti

swap

swapMulti

swapWithReferral

swapWithReferralMulti

makeGasDiscount

Flags

Flag types

Flags description

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