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Prerequisites

You will need to install the Paradex SDK to instantiate a Paradex chain adapter. As Paradex can derive an account from either a Starknet or an EVM based signature, you have two options of initializing a Paradex account to be passed into the chain adapter function. 
import { Account, Config, ParaclearProvider } from '@paradex/sdk'

const config = Config.fetchConfig('prod')
const paradexAccount = await Account.fromStarknetAccount(
  {
    provider: new ParaclearProvider.DefaultProvider(config),
    config,
    account // your starknet.js account
  },
)
Once you have your Paradex account object set up, you can create the chain adapter from it: 
import { getParadexChainAdapterFromAccount } from '@rhino.fi/sdk/adapters/paradex'

const chainAdapter = getParadexChainAdapterFromAccount(
  paradexAccount,
  chainConfig
)