Syntax

exchange.IO("contracts", ...)

Obtains commonly used contract addresses on the current chain (or a specified chain), including mainstream tokens, Multicall3, Permit2, as well as the Factory, router, QuoterV2, and position manager contracts of Uniswap V3 and PancakeSwap V3.


    
    
    
exchange.IO(k)


    
    
    
exchange.IO(k, chainId)

Examples

View the commonly used contract addresses of the current chain and use QuoterV2 to get a quote.


    javascript
    
    
function main() {
    // Get the commonly used contract address table of the current chain
    var C = exchange.IO("contracts")
    Log(C.name, "chainId:", C.chainId, "Wrapped native token:", C.wrappedNative)
    for (var sym in C.tokens) {
        Log(sym, C.tokens[sym].address, "decimals:", C.tokens[sym].decimals)
    }
    Log("Uniswap V3:", JSON.stringify(C.uniswapV3))

    // Use the addresses in the address table and the built-in ABI template to get a quote
    var quoter = C.uniswapV3.quoterV2
    exchange.IO("abi", quoter, "uniswapV3QuoterV2")
    var q = exchange.IO("call", quoter, "quoteExactInputSingle",
        [C.tokens.WETH.address, C.tokens.USDC.address, exchange.IO("toUnits", "1", 18), 500, 0])
    Log("1 WETH ≈", exchange.IO("fromUnits", q.amountOut, 6), "USDC")

    // View the address table of another chain
    Log("BSC PancakeSwap V3:", JSON.stringify(exchange.IO("contracts", 56).pancakeV3))
}

Returns

Type Description

object

Returns {chainId, name, wrappedNative, tokens, multicall3, permit2, uniswapV3, pancakeV3}: name is the chain name; wrappedNative is the wrapped native coin's key in tokens (such as WETH or WBNB); each entry of tokens is {address, decimals}; uniswapV3 and pancakeV3 contain factory, router (SwapRouter02 for Uniswap, SmartRouter for PancakeSwap), quoterV2 and positionManager. An unsupported chain returns a null value and reports an error.

Arguments

Name	Type	Required	Description
k	string	Yes	Functionality of the `exchange.IO()` function. When set to `contracts`, it indicates that the function is used to obtain commonly used contract addresses.
chainId	number	No	Chain ID. If not passed, the chain of the current node is used by default. Currently supported chains: Ethereum (1), BNB Smart Chain (56), Base (8453), Arbitrum One (42161).