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Examples

Fetch Compound debt and collateral

As of now, to get all cTokens along with a user's debt on Compound you need to perform over 10 calls to the Ethereum node to different contracts or rely on a centralized API. With DeFi SDK, you can call

getProtocolBalances('0xdead...beef', ['Compound'])

on the api.zerion.eth{target=_blank} smart contract and get all borrowed and supplied tokens

[{
  metadata: {
    name: 'Compound',
    description: 'Decentralized Lending & Borrowing Protocol',
    websiteURL: 'compound.finance',
    iconURL: 'protocol-icons.s3.amazonaws.com/compound.png',
    version: '0'
  },
  adapterBalances: [{
    metadata: {
      adapterAddress: '0x90F0Ed76cfCf75Ccab31A9b4E51782F230aA0747',
      adapterType: 'Asset'
    },
    balances: [{
      base: {
        metadata: {
          token: '0x6C8c6b02E7b2BE14d4fA6022Dfd6d75921D90E4E',
          name: 'Compound Basic Attention Token',
          symbol: 'cBAT',
          decimals: '8'
        },
        amount: '314159265'
      },
      underlying: [{
        metadata: {
          token: '0x0D8775F648430679A709E98d2b0Cb6250d2887EF',
          name: 'Basic Attention Token',
          symbol: 'BAT',
          decimals: '18'
        },
        amount: '6626070040000000000'
      }]
    }]
  },{
      metadata: {
        adapterAddress: '0xD0646777520Aff625F976a8D81b95B5B42cDa1B9',
        adapterType: 'Debt'
      },
      balances: [{
        base: {
          metadata: {
            token: '0x6B175474E89094C44Da98b954EedeAC495271d0F',
            name: 'Dai Stablecoin',
            symbol: 'DAI',
            decimals: '18'
          },
          amount: '1971081500000000000'
        },
        underlying: []
      }]
    }
  ]
}]

Make sense of tokens like UNI-V1 ETH-cDAI

Sometimes, a DeFi token contains several other tokens, and to calculate their price, you need to know their underlying assets. For example, a Uniswap V1 cDAI pool consists of ETH and cDAI. cDAI, in turn, has DAI as an underlying token. With DeFi SDK you can call

// Uniswap V1 cDAI pool
getFinalFullTokenBalance('0x34E89740adF97C3A9D3f63Cc2cE4a914382c230b', "Uniswap V1 Pool Token")

and fetch the decomposition of UNI-token into ERC20 tokens, like ETH and DAI

0.98 ETH
215.6 DAI

Get account balances across all supported DeFi protocols

In case you want to get account balances across all supported DeFi protocols, you can call

// bankless.zerion.eth portfolio 
getBalances('0x0ef51b7dac3933b8109482e7d910c21848e45da0f')

and obtain all balances for a given account. The response from the smart-contract will contain information about each of the protocols

100 DAI // collateral on Compound
0.1 ETH // debt on Compound
100 USDC // locked in PoolTogether
213 TUSD + 201 USDC + 82 USDT + 11 DAI // Curve Y Pool
...