@lido-sdk/contracts
v3.1.0
Published
This project is being slowly deprecated and may not receive further updates. Check out [modern Lido SDK](https://github.com/lidofinance/lido-ethereum-sdk/pulls) to access latest functionality. It is actively maintained and is built for interacting with Li
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⚠️DEPRECATION WARNING⚠️
This project is being slowly deprecated and may not receive further updates. Check out modern Lido SDK to access latest functionality. It is actively maintained and is built for interacting with Lido Protocol.
Contracts
Contracts for Lido Finance projects. Part of Lido JS SDK
A Contract is an abstraction of code that has been deployed to the blockchain. A Contract may be sent transactions, which will trigger its code to be run with the input of the transaction data. More details in the ethers docs.
It uses TypeChain under the hood to generate TypeScript typings for contacts.
Install
yarn add @lido-sdk/contracts
Getters
Each getter returns a cached Contract instance with an attached Provider and an ABI. The Provider is required to work with the network and sign transactions and the ABI contains information about methods of the contract on the ethereum side. So, the resulting instance contains all the methods supported by the contract and allows you to call them.
If a contract method requires signing a transaction, then you need a provider with Signer
getERC20Contract
Returns an instance of Contract
based on ERC20 standard contract ABI.
import { getERC20Contract } from '@lido-sdk/contracts';
import { JsonRpcProvider } from '@ethersproject/providers';
const provider = new JsonRpcProvider('http://localhost:8545');
const contract = getERC20Contract(
'0xae7ab96520de3a18e5e111b5eaab095312d7fe84',
provider,
);
const symbol = await contract.symbol();
const decimals = await contract.decimals();
getWSTETHContract
Returns an instance of Contract
based on wstETH contract ABI. Available contract methods and detailed documentation can be found here: https://docs.lido.fi/contracts/wsteth
getSTETHContract
Returns an instance of Contract
based on stETH contract ABI. Available contract methods and detailed documentation can be found here: https://docs.lido.fi/contracts/lido
getLDOContract
Returns an instance of Contract
based on LDO token ABI. LDO Token docs can be found here: https://docs.lido.fi/lido-dao/#ldo-token
getWithdrawalQueueContract
Returns an instance of Contract
based on WithdrawalQueue contract ABI. Contract docs here: https://docs.lido.fi/contracts/withdrawal-queue-erc721
getAggregatorContract
Returns an instance of Contract
based on ChainLink USD/ETH price oracle ABI. EACAggregatorProxy https://etherscan.io/address/0x5f4eC3Df9cbd43714FE2740f5E3616155c5b8419
Cache
To get another contract instance, getters have a third optional parameter cacheSeed
.
Calls without cacheSeed
or with the same cacheSeed
return the same contracts:
const contractFirst = getERC20Contract('0x0...', provider, 1);
const contractSecond = getERC20Contract('0x0...', provider, 1);
contractFirst === contractSecond; // true
Calls with different cacheSeed
return different contracts:
const contractFirst = getERC20Contract('0x0...', provider, 1);
const contractSecond = getERC20Contract('0x0...', provider, 2);
contractFirst !== contractSecond; // true
Of course, if the cacheSeed
is the same, but address
or provider
are different the result contracts will also be different:
const contractFirst = getERC20Contract('0x1...', provider, 1);
const contractSecond = getERC20Contract('0x0...', provider, 1);
contractFirst !== contractSecond; // true, because the addresses are different