Get MATIC balance from Polygon Chain not documented

[kombos]

Maticjs documentation of wiki does not how how to get the MATIC balance from Polygon Chain. Am I missing something?

[karlvlam]

@kombos I put the contract address of MATIC in the erc20 function. Hope it helps.

const erc20ChildToken = posClient.erc20('0x0000000000000000000000000000000000001010');                         
let bal = await erc20ChildToken.getBalance(providerChild.getAddress());