Nubian Coven SDK

The official Nubain Coven Software Development Kit (SDK) for JavaScript, available for browsers and Node.js backends.

Installation

To get started, install the nubian coven SDK package from npm:

npm install nubian-coven-sdk

Usage

To enable web3 calls via SDK, instantiate web3 library

// in browser
if (window.ethereum) {
  window.web3 = new Web3(window.ethereum)
} else if (window.web3) {
  window.web3 = new Web3(window.web3.currentProvider)
} else {
  window.web3 = new Web3(customProvider)
}

// in nodejs
const Web3 = require('web3')
const NUB = require('nubian-coven-sdk')
const web3 = new Web3(new Web3.providers.HttpProvider(BSC_RPC_URL))

Now instantiate NUB with web3 instance.

// in browser
const nub = new NUB(web3)

// in nodejs
const nub = new NUB({
  web3: web3,
  mode: 'node',
  privateKey: PRIVATE_KEY,
})

The Nubian SDK provides methods to swap and save tokens.

Swap

nub.pancakeswap.swap({ 
  amountA, 
  amountB, 
  tokenA, 
  tokenB,
  path
  [, slippage 
    [, receiver 
      [, ...transactionConfig ]]]
}) => Promise<TransactionReceipt>

This function swaps a token for another. It is a promise that resolves to a transaction receipt if it is successful. It throws an error if it is unsuccessful.

Parameter	Type	Description
tokenA	string	Address of token to swap. Use 0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE for BNB.
tokenB	string	Address of token to swap to. Use 0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE for BNB.
amountA	string/number	Amount of tokenA to be swapped.
amountB	string/number	Amount of tokenB expected to recieve from swap. You can use the swap path util method to deduce it.
path	string[]	The tokens you want tokenA to swapped to before being swapped to tokenB.
slippage	number	The percentage amount amountB can reduce by. E.g pass2 if you do not want amountB from swap to go less than 2%. (optional).
reciever	string	The address to receive the swap output. It defaults to the address from the web3 instance in browser mode or the address of the private key in node environment. (optional)
transactionConfig	object	It is an object that specifies blockchain transaction properties. Check common terms for an exhaustive description.

Swap Path/Token Price

When swapping using Pancakeswap each token has a price and a swap path. The swap path refers to the tokens the token you want to swap will be exchanged with before being converted to the destination token. This function returns the most efficient path for the swap and the amount of tokens you get or need to supply.

nub.pancakeswap.getRoute(
  tokenIn, 
  tokenOut, 
  amount,
  direction, 
  fresh
) => Promise<[string, string[]]>

Parameter	Type	Description
tokenIn	string	Address of token to swap. Use 0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE for BNB.
tokenOut	string	Address of token to swap to. Use 0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE for BNB.
amount	string	Amount of tokenIn to swap or the amount of tokenOut you want. It should be formatted with the decimal points.
direction	IN|OUT	It is used to indicate which token owns amount. "IN" indicates amount is the number of tokens to swap while "OUT" indicates amount is the number of tokens you want from swap.
fresh	boolean	When you first call getRoute on a pancakeswap instance, the details used to calculate the path are saved. fresh indicates if you want new details fetched from the chain or old details used.

This function returns a promise that resolves to an object.

Object Property	Type	Description
amount	string	The amount of tokens you get from swap or amount of tokens needed for swap. Depends on the value of direction. Decimal points are applied.
path	string[]	An array of the path/route for possible token swap

Save

nub.venus.deposit({
  amount,
  address
  [, receiver
    [, ...transactionConfig ]]
}) => Promise<TransactionReceipt>

This function saves token deposits in Venus protocol. When you save, Venus gives you vTokens. These are tokens that serve as proof of deposit. To get back your tokens saved, you must provide these vTokens. Venus has a set of tokens it allows you to save.

Parameter	Type	Description
address	string	Address of token to save. Use 0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE for BNB.
amount	string/number	Amount of token to save.
reciever	string	The address to receive the vtokens. It defaults to the address from the web3 instance in browser mode or the address of the private key in node environment. (optional)
transactionConfig	object	It is an object that specifies blockchain transaction properties. Check common terms for an exhaustive description.

Withdraw Savings

nub.venus.withdraw({
  vTokenAddress
  [, vTokenAmount 
    [, tokenAmount
      [, receiver
        [, ...transactionConfig ]]]]
}) => Promise<TransactionReceipt>

This function allows you to withdraw tokens saved in Venus protocol. You will need to have the corresponding vToken of the token you want to withdraw.

Parameter	Type	Description
vTokenAddress	string	vToken address of the token you want to withdraw.
vTokenAmount	string/number	Amount of vTokens you want to withdraw. You must provide this or the tokenAmount. (optional)
tokenAmount	string/number	Amount of vTokenAddress corresponding token you want to withdraw. You must provide this or the vTokenAmount. (optional)
reciever	string	The address to receive the vtokens. It defaults to the address from the web3 instance in browser mode or the address of the private key in node environment. (optional)
transactionConfig	object	It is an object that specifies blockchain transaction properties. Check common terms for an exhaustive description.

Note: You must provide one of vTokenAmount and tokenAmount.

Util Methods

Token Transfer

You can transfer tokens using the erc20 transfer function. It receives an object as input. It returns a promise that resolves to a transaction object

nub.erc20.transfer({
  token, amount, to [, ...transactionConfig]
}) => Promise<TransactionReceipt>

Object Parameters	Type	Description
token	string	The address of the ERC20 token you want to send.
amount	string	The amount of tokens you want to send. It must include the decimal places of the token. E.g 1*10**18 to send 1 WBNB.
to	string	The address you want to send the token to.

Estimate Token Transfer Gas

This helps you get the estimated gas needed to do a token transfer based on current network activity. It takes the same parameters as token transfer.

nub.erc20.estimateTransferGas({
  token, amount, to [, ...transactionConfig]
}) => Promise<TransactionReceipt>

It returns a promise that resolves to the gas object.

BNB Transfer

For BNB transfers, use the eth transfer function. It also receives an object as input. It returns a promise that resolves to a transaction object.

nub.eth.transfer({amount, to [, ...transactionConfig]}) => Promise<TransactionReceipt>;

Object Parameters	Type	Description
amount	string	The amount of BNB you want to send in wei (smallest BNB unit).
to	string	The address you want to send the BNB.

Estimate BNB Transfer Gas

Estimates the fee details needed to make a token transfer.

nub.eth.estimateTransferGas({amount, to [, ...transactionConfig]})

It returns a promise that resolves to the gas object.

Wrap BNB

BNB can be wrapped to WBNB using the SDK.

nub.wbnb.wrap({amount [, ...transactionConfig]}) => Promise<TransactionReceipt>

The function takes in the amount of BNB you want to wrap. It returns a promise that resolves to a transaction receipt.

Estimate Wrap Gas

nub.wbnb.estimateWrapGas({amount [, ...transactionConfig]}) => Promise<GasObject>

The function takes in the amount of BNB you want to use in estimation. It returns a promise that resolves to the gas object.

Unwrap BNB

WBNB can be unwrapped to BNB.

nub.wbnb.unwrap({amount [, ...transactionConfig]}) => Promise<TransactionReceipt>

The function takes in the amount of WBNB you want to unwrap. You must have this amount of WBNB already approved. It returns a promise that resolves to a transaction receipt.

Estimate Unwrap Gas

nub.wbnb.unwrap({amount [, ...transactionConfig]}) => Promise<GasObject>

The function takes in the amount of WBNB you want to unwrap.

Approval

You can approve addresses to spend the ERC20 token. It also receives an object as input and returns a promise that resolves to a transaction object.

nub.erc20.approve({
  token
  [, amount
    [, to
      [, ...transactionConfig]]]
}) => Promise<TransactionReceipt>

Object Parameters	Type	Description
token	string	Address of the token you want to approve for a spender.
amount	string	The amount of tokens to be approved for spending. If empty it defaults to maxUint256 i.e an infinite approval. It must include the decimal places of the token. E.g 1*10**18 to send 1 WBNB. (optional)
to	string	The address to be approved. It defaults to the Wizard address if not passed.(optional)

Estimate Approval Gas

This helps you get the estimated gas needed to do an approval based on current network activity. It takes the same parameters as approvals.

nub.erc20.estimateApproveGas({
  token
  [, amount
    [, to
      [, ...transactionConfig]]]
}) => Promise<GasObject>

It returns a promise that resolves to the gas object.

Pancakeswap LpToken Price

You can get the price of a Pancakeswap Liquidity provider token (lptoken) in US dollars using this function. It returns a promise that resolves to a number and takes the address of the lp token as an input.

nub.pancakeswap.getLpPrice(tokenAddress) => Promise<number>

Common Terms

Transaction Config

Parameter (optional)	Type	Description
gasPrice	string/number	The gas price in gwei. Mostly used in Node implementation to configure the transaction confirmation speed.
value	string/number	Amount of BNB which you want to send along with the transaction (in wei).
nonce	string/number	Nonce of your sender account. Mostly used in Node implementation to send transaction with a particular nonce either to override unconfirmed transaction or some other purpose.
from	string	The address to send the transaction from. It defaults to the address from the web3 instance in browser mode or the address of the private key in node environment.

Transaction Receipt

The transaction receipt describes various properties of the blockchain transaction. It is properly described in the web3js documentation.

Gas Object

This object contains all the fee/gas information needed for a transaction.

Property	Description
gas	The amount of gas to be used.
price	The price for each unit of gas in wei.
fee	The fee for the transaction. (gas*price).

maxUint256

This is the the maximum figure that can be held in the uint256 type of solidity. It can be represented in Javascript using 0xffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff.

vTokens

vTokens are ERC20 tokens that Venus mints to an address when it makes a successful deposit into the Venus protocol. These tokens are returned when a withdrawal is made. The amount an address has saved can be deduced from the amount of vTokens in its balance. These tokens are transferrable. Here is a list of tokens supported by Venus and their corresponding vToken addresses:

TokenId	Token	vToken
BNB	0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE	0xA07c5b74C9B40447a954e1466938b865b6BBea36
BUSD	0xe9e7CEA3DedcA5984780Bafc599bD69ADd087D56	0x95c78222B3D6e262426483D42CfA53685A67Ab9D
SXP	0x47BEAd2563dCBf3bF2c9407fEa4dC236fAbA485A	0x2fF3d0F6990a40261c66E1ff2017aCBc282EB6d0
USDC	0x8AC76a51cc950d9822D68b83fE1Ad97B32Cd580d	0xecA88125a5ADbe82614ffC12D0DB554E2e2867C8
USDT	0x55d398326f99059fF775485246999027B3197955	0xfD5840Cd36d94D7229439859C0112a4185BC0255
XVS	0xcF6BB5389c92Bdda8a3747Ddb454cB7a64626C63	0x151B1e2635A717bcDc836ECd6FbB62B674FE3E1D
BTC	0x7130d2A12B9BCbFAe4f2634d864A1Ee1Ce3Ead9c	0x882C173bC7Ff3b7786CA16dfeD3DFFfb9Ee7847B
ETH	0x2170Ed0880ac9A755fd29B2688956BD959F933F8	0xf508fCD89b8bd15579dc79A6827cB4686A3592c8
LTC	0x4338665CBB7B2485A8855A139b75D5e34AB0DB94	0x57A5297F2cB2c0AaC9D554660acd6D385Ab50c6B
XRP	0x1D2F0da169ceB9fC7B3144628dB156f3F6c60dBE	0xB248a295732e0225acd3337607cc01068e3b9c10
BCH	0x8ff795a6f4d97e7887c79bea79aba5cc76444adf	0x5f0388ebc2b94fa8e123f404b79ccf5f40b29176
DOT	0x7083609fce4d1d8dc0c979aab8c869ea2c873402	0x1610bc33319e9398de5f57b33a5b184c806ad217
LINK	0xf8a0bf9cf54bb92f17374d9e9a321e6a111a51bd	0x650b940a1033b8a1b1873f78730fcfc73ec11f1f
DAI	0x1af3f329e8be154074d8769d1ffa4ee058b1dbc3	0x334b3ecb4dca3593bccc3c7ebd1a1c1d1780fbf1
FIL	0x0d8ce2a99bb6e3b7db580ed848240e4a0f9ae153	0xf91d58b5ae142dacc749f58a49fcbac340cb0343
BETH	0x250632378e573c6be1ac2f97fcdf00515d0aa91b	0x972207a639cc1b374b893cc33fa251b55ceb7c0
ADA	0x3ee2200efb3400fabb9aacf31297cbdd1d435d47	0x9a0af7fdb2065ce470d72664de73cae409da28ec
DOGE	0xba2ae424d960c26247dd6c32edc70b295c744c43	0xec3422ef92b2fb59e84c8b02ba73f1fe84ed8d71
MATIC	0xcc42724c6683b7e57334c4e856f4c9965ed682bd	0x5c9476fcd6a4f9a3654139721c949c2233bbbbc8
CAKE	0x0e09fabb73bd3ade0a17ecc321fd13a19e81ce82	0x86ac3974e2bd0d60825230fa6f355ff11409df5c
AAVE	0xfb6115445bff7b52feb98650c87f44907e58f802	0x26da28954763b92139ed49283625cecaf52c6f94
TUSD	0x14016e85a25aeb13065688cafb43044c2ef86784	0x08ceb3f4a7ed3500ca0982bcd0fc7816688084c3