EVM chains

Since all EVM chains can use the same tooling and libraries, you can use the same chain adapter function for all of them. You can create one either from a EIP-1193 compatible provider or as a shortcut from a private key.

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From EIP-1193 provider

Use this method to use connected wallets in webapps or if you want to set up a provider yourself.

import { getEvmChainAdapterFromProvider } from '@rhino.fi/sdk/adapters/evm'

const chainAdapter = getEvmChainAdapterFromProvider(
  provider,
  chainConfig
)

​

From private key

Use this method as a shortcut to setting up a provider yourself.

import { getEvmChainAdapterFromPrivateKey } from '@rhino.fi/sdk/adapters/evm'

const chainAdapter = getEvmChainAdapterFromPrivateKey(
  'YOUR_PRIVATE_KEY',
  chainConfig
)

​

Options

Both functions also accept a 3rd options parameter. Currently it only includes a tokenAllowanceOverride property that allows you to specify a higher token allowance to be used instead of the calculated one. This can be useful to optimize gas usage by setting bigger allowances that will last for multiple bridges.

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Fetching EVM balances

Normally you would use the getAllBalances function on a chain adapter to fetch all balances of an address on a chain. However as the same address is can hold assets on any EVM chain, it would be very cumbersome to create a chain adapter for each EVM chain and query it’s balances.
To make this easier, the the SDK provides a shortcut function to fetch all balances on all supported EVM chains by only providing the bridge config and a wallet address. You can use it like this:

import { getAllEvmBalances } from '@rhino.fi/sdk/adapters/evm'

const balances = await getAllEvmBalances(bridgeConfig, 'WALLET_ADDRESS')

console.log(balances)

The result will look like this:

{
  ETHEREUM: {
    USDT: {
      tokenConfig: {...},
      balance: 10550000n,
      balanceWithDecimals; 10.55,
      balanceFormatted: '10.55',
    },
    USDC: {...},
  },
  BASE: {...}
}