DeFi SDK is an open-source system of smart contracts designed for precise DeFi portfolio accounting. To put it simply, DeFi SDK is the on-chain balanceOf for DeFi protocols.

If you have any questions about DeFi SDK, feel free to reach out to us on our Discord server.

How much debt does 0xdead..beef have on Compound?

How much cUSDC vs ETH does ETHMACOAPY have?

See What’s next for DeFi SDK

• Examples
• DeFi SDK architecture
• Addresses
• Supported protocols
• How to add your adapter
• What’s next for DeFi SDK
• Security vulnerabilities

Find more examples of defi-sdk usage here (web3js, ethers.js).

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 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: []
      }]
    }
  ]
}]

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("Uniswap V1 pool token", 0x34E89740adF97C3A9D3f63Cc2cE4a914382c230b)

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

0.98 ETH
215.6 DAI

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
...

For the protocols that uses a lot of liquidity pools (Bancor, Balancer, Uniswap) balances are not available by default in getBalances() function. Balances for such protocols must be fetched by getAdapterBalance() function with a list of pools passed as a function parameter. If you call

getBalances(
    0x42b9dF65B219B3dD36FF330A4dD8f327A6Ada990, // account address
    0x581Ae5AF7afa6f8171Bbf40d1981779F168A9523, // balancer adapter address
    [0x53b89CE35928dda346c574D9105A5479CB87231c,
        0x987D7Cc04652710b74Fff380403f5c02f82e290a] // balancer pools addresses 
) 

you will obtain Balancer balances for given pools. The response from the smart-contract will contain information about each of the pools

1.3 ETH + 552.4 DAI // 30% WETH + 70% DAI pool
4.2 MKR + 2.5 WETH // 75% MKR + 25% WETH pool

• ProtocolAdapter is a special contract for every protocol. Its main purpose is to wrap all the protocol interactions. There are different types of protocol adapters: "Asset" adapter returns the amount of the account's tokens held on the protocol and the "Debt" adapter returns the amount of the account's debt to the protocol. Some protocols do not use "simple" ERC20 tokens but instead have complex derivatives, for example the Compound protocol has CTokens. The ProtocolAdapter contract also provides information about the type of tokens used within it.
• TokenAdapter is a contract for every derivative token type (e.g cTokens, aTokens, yTokens, etc.) Its main purpose is to provide ERC20-style token metadata as well as information about the underlying ERC20 tokens (like DAI for cDAI). Namely, it provides addresses, types and rates of underlying tokens.
• AdapterRegistry is a contract that a) maintains a list of ProtocolAdapters and TokenAdapters and b) is called to fetch user balances.

More detailed documentation about contracts can be found in adapters and AdapterRegistry documentation.

AdapterRegistry contract's mainnet address is 0x06FE76B2f432fdfEcAEf1a7d4f6C3d41B5861672. Its source code is verified on etherscan.

All the deployed contracts' addresses are available here.

The full instructions on how to add a custom adapter to the AdapterRegistry contract may be found in our wiki.

If you have questions and/or want to add your adapter to Zerion reach out to us on our Discord server.

This first version of DeFi SDK is for read-only accounting purposes. Our next step is to introduce Interactive Adapters that allow users to make cross-protocol transactions from a single interface. We are incredibly excited to work with developers, users and the wider DeFi community to make these integrations as secure and accessible as possible. Watch this space, because the “De” in DeFi is about to get a whole lot more user-friendly!

If you discover a security vulnerability within DeFi SDK, please send us an e-mail at [email protected]. All security vulnerabilities will be promptly addressed.

This project uses Truffle and web3js for all Ethereum interactions and testing.

npm run compile

npm run test

npm run coverage

Currently, unsupported files are ignored.

npm run lint

Currently, unsupported files are ignored.

npm run deploy:network, network is either development or mainnet

truffle run verify ContractName@0xcontractAddress --network mainnet

All smart contracts are released under GNU LGPLv3.