Set Protocol: Baskets of tokenized assets - Kauri
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POSTED 08 Apr 2019 16:43

Set Protocol: Baskets of tokenized assets

erc20
portfolio
open-finance
AUTHOR
Kauri Team

Set Protocol allows grouping multiple tokens into one asset. Each set is a deployed smart contract with each set being fully-collateralized. Anyone can deposit a token to the set contract and withdraw them back, which makes the sets permissionless. Sets comply with the ERC20 standard, so they can be transferred and traded on exchanges. This also means that sets can be grouped into other sets.

This article originally appeared on the Set Protocol Docs Portal

Welcome Settler of Tokan 👋 setprotocol.js is a Javascript library for interacting with Set Protocol.

Warning: This is Alpha software, and is subject to non-backwards compatible changes. Please develop at your own risk of major changes.

Now that we got that out of the way, let’s get started 🚀

Concepts

Typescript

setprotocol.js and set-protocol-contracts utilize Typescript to enforce strong static typing throughout our code bases. This makes typing checking and schema validation seamless which is particularly useful when working with financial products where there are many conversions and abstractions used.

You can find more about Typescript here.

Async / Await

setprotocol.js is a promised-based library and makes heavy use of asynchronous calls. We recommend using the latest async / await syntax for clean asynchronous code without having to use a third party coroutine implementation. It looks something like this:

const getUserBalance = async function(userAddress) {
  return await setProtocol.erc20.balanceOf(userAddress);
};

You can learn more about async / await here.

BigNumber

Our libraries utilize the bignumber.js library for representations of large numbers in Javascript. This is due to Javascript’s inability to handle large numbers properly (more on this later). When passing numerical figures into setprotocol.js functions, we require that they be instances of BigNumber:

const quantityToIssue = new BigNumber(1000000);

If you’re having issues with BigNumber, it may be that you are using the wrong version. Try using BigNumber v5.0.0 vs the latest.

Installation

setprotocol.js

The Javascript SDK can be installed via yarn or npm.

BigNumber.js @ ^5.0.0

setprotocol.js uses BigNumber to represent large numbers. The latest stable version we use is BigNumber@^5.0.0.

Web3 1.0

This newest 1.1.0 release candidate of setprotocol.js uses Web3 1.0. If you want to use the older versions of web3, you will need to use an older version of setprotocol.js (i.e. v1.2.0-rc12).

// Recommended method
yarn add setprotocol.js
yarn add bignumber.js@^5.0.0
yarn add web3@1.0.0-beta.36
​
// or
npm install --save setprotocol.js
npm install --save bignumber.js@^5.0.0
npm install --save web3@1.0.0-beta.36

Usage

Let’s initialize our setProtocol instance. We need to first import our library like this:

import SetProtocol from 'setprotocol.js';

Config

When instantiating an instance of setProtocol, the constructor requires a provider and config object.

The configuration object requires inputs of the suite of Set smart contract addresses: Core, Transfer Proxy, Vault, RebalanceAuctionModule, Set Token Factory, Rebalancing Set Token Factory, Exchange Issue Module, Issuance Order Module, Rebalancing Token Issuance Module, and Payable Exchange Issue. The following external contract addresses are also required: Kyber Network Wrapper and Wrapped Ether.

const config = {
  coreAddress: '0xxxx'
  transferProxyAddress: '0x...',
  vaultAddress: '0x...',
  rebalanceAuctionModuleAddress: '0x...',
  kyberNetworkWrapperAddress: '0x...',
  setTokenFactoryAddress: '0x...',
  rebalancingSetTokenFactoryAddress: '0x...',
  exchangeIssueModuleAddress: '0x...',
  issuanceOrderModuleAddress: '0x...',
  rebalancingTokenIssuanceModule: '0x...',
  payableExchangeIssue: '0x...',
  wrappedEtherAddress: '0x...',
};

For reference, we’ve provided the contract addresses below across multiple networks. We recommend using Kovan TestNet since it contains the 0x exchange contract which is required to build a Set relayer that consumes 0x orders for liquidity (more on this later).

The rest of the contracts can be found in the Smart Contract section here.

Network Contract Address
MainNet Core 0x75FBBDEAfE23a48c0736B2731b956b7a03aDcfB2
ExchangeIssueModule 0x38E5462BBE6A72F79606c1A0007468aA4334A92b
IssuanceOrderModule 0x8440f6a2c42118bed0D6E6A89Bf170ffd13e21c0
KyberNetworkWrapper 0x3700414Bb6716FcD8B14344fb10DDd91FdEA59eC
PayableExchangeIssue 0x18B739aabC019d9eF160D44BA8A9dD6a717372Af
RebalanceAuctionModule 0x1db929398958082d2080AA1B501e460503f60467
RebalancingSetTokenFactory 0x4c4C649455c6433dC48ff1571C9e50aC58f0CeFA
RebalancingTokenIssuanceModule 0x1F6eE9CE38E6BEEB968BB91f755998548D3165e0
SetTokenFactory 0x14f0321be5e581abF9d5BC76260bf015Dc04C53d
TransferProxy 0x25C499e7306248C308cef403D9824110817b305C
Vault 0x5ecd8E3b059BC5A69E2d7a73c60Bd4E9788972FF
Wrapped Ether 0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2
Kovan Core 0x79c9eCb5c9a34d5FFd2aDc956AdCaFcC6F983234
ExchangeIssueModule 0x5507dB57A67C029a33F0CC89B641C1963F4c9a4c
IssuanceOrderModule 0x2De291709980Dd2640c33e614E97D4e0aB4F1a27
KyberNetworkWrapper 0x40c39C462264ff8E0C372d3F18b6F0444d048e43
PayableExchangeIssue 0x6E9C790fE4329e012BBd7DF93AbcA42276aCE374
RebalanceAuctionModule 0x2C229EE3aD3fdC0e581d51BaA6b6f45CC9A6Ca39
RebalancingSetTokenFactory 0x5A736e0706066B4C3F91dbD1599A2C83b1Efe6f7
RebalancingTokenIssuanceModule 0x806E2a3e6dfB2387a4FfB7A44D8756b2EaFA574f
SetTokenFactory 0x8F43Ee43cE545193A79466642BC5FfF381036908
TransferProxy 0x640f4F4AA4e4449F630d37801CAF5452b9462AC4
Vault 0xb53A6593169A2974282f5690928FAe897A738571
TestRPC Core 0x5315e44798395d4a952530d131249fe00f554565
SetTokenFactory 0xdff540fe764855d3175dcfae9d91ae8aee5c6d6f
Vault 0x72d5a2213bfe46df9fbda08e22f536ac6ca8907e
TransferProxy 0x2ebb94cc79d7d0f1195300aaf191d118f53292a8
RebalancingSetTokenFactory 0xc1be2c0bb387aa13d5019a9c518e8bc93cb53360

Blockchain Setup

We recommend using the TestNet smart contracts, but we support developing on TestRPC here as well.

If you’re going to run on TestNet, you can go ahead and skip this section.

We have an Ethereum blockchain snapshot set up for you with setprotocol.js that is preloaded with all of the Set Protocol contracts.

First, create your set-chain script that runs your TestRPC locally.

// package.json
"scripts": {
  "set-chain": "set-chain"
}

Then open a new terminal tab in the same directory and run the following command.

yarn set-chain

This runs a blockchain locally using Ganache-cli with the snapshots at http://localhost:8545.

Web3

Next, we need to instantiate the web3 provider to pass into the SetProtocol constructor. If you’re developing using a local node or TestRPC, the chain can be found at port 8545. If no instance is passed in (for instance when Metamask is injected into the global scope), we’ll attempt to use the Metamask Web3 object.

TestNet Method

When trying to connect to TestNet, use the web3 provider injected by MetaMask or Mist.

import * as Web3 from 'web3';
​
const injectedWeb3 = window.web3 || undefined;
let provider;
try {
  // Use MetaMask/Mist provider
  provider = injectedWeb3.currentProvider;
} catch (err) {
  // Throws when user doesn't have MetaMask/Mist running
  throw new Error(`No injected web3 found when initializing setProtocol: ${err}`);
}

Local TestRPC Method

import * as Web3 from 'web3';
​
const web3 = new Web3();
​
const provider = new Web3.providers.HttpProvider('http://localhost:8545');

Typescript

If you’re using Typescript, you’ll need to declare your web3 module. To do this, we’ll borrow from 0x who have generously exported Web3 typings for our use. Run:

yarn add @0xproject/typescript-typings

And add the following to your tsconfig.json:

// tsconfig.json
{
  "compilerOptions": {
    "baseUrl": ".",
    "typeRoots": [
      "node_modules/@0xproject/typescript-typings/types",
      "node_modules/setprotocol.js/src/types",
      "node_modules/@types"
    ],
    "paths": {
      "*": [
        "node_modules/@0xproject/typescript-typings/types/*",
      ]
    }
  }
}

This tells Typescript to look inside of the node_modules/@0xproject/typescript-typings/types and node_modules/setprotocol.js/src/types for type definitions, alongside the default @types folder.

Next, you‘ll need to declare web3 on the Window object if you‘re using web3 on the front-end:

declare global {
  // tslint:disable-next-line
  interface Window { web3: any; }
}

Instantiation

Finally, we can instantiate our setProtocol instance by passing in the provider and configuration.

const setProtocol = new SetProtocol(provider, config);

Summary

With our packages imported, config set up, web3 initialized, and setProtocol instantiated, it should look like this:

import SetProtocol from 'setprotocol.js';
import * as Web3 from 'web3';
​
// Kovan Config
const config = {
  coreAddress: '0x79c9eCb5c9a34d5FFd2aDc956AdCaFcC6F983234',
  exchangeIssueModuleAddress: '0x5507dB57A67C029a33F0CC89B641C1963F4c9a4c',
  issuanceOrderModuleAddress: '0x2De291709980Dd2640c33e614E97D4e0aB4F1a27',
  kyberNetworkWrapperAddress: '0x40c39C462264ff8E0C372d3F18b6F0444d048e43',
  payableExchangeIssueAddress: '0x6E9C790fE4329e012BBd7DF93AbcA42276aCE374',
  rebalanceAuctionModuleAddress: '0x2C229EE3aD3fdC0e581d51BaA6b6f45CC9A6Ca39',
  rebalancingSetTokenFactoryAddress: '0x5A736e0706066B4C3F91dbD1599A2C83b1Efe6f7',
  rebalancingTokenIssuanceModuleAddress: '0x806E2a3e6dfB2387a4FfB7A44D8756b2EaFA574f',
  setTokenFactoryAddress: '0x8F43Ee43cE545193A79466642BC5FfF381036908',
  transferProxyAddress: '0x640f4F4AA4e4449F630d37801CAF5452b9462AC4',
  wrappedEtherAddress: '0xd0a1e359811322d97991e03f863a0c30c2cf029c',
  vaultAddress: '0xb53A6593169A2974282f5690928FAe897A738571',
};
​
const injectedWeb3 = window.web3 || undefined;
let provider;
try {
  // Use MetaMask/Mist provider
  provider = injectedWeb3.currentProvider;
} catch (err) {
  // Throws when user doesn't have MetaMask/Mist running
  throw new Error(`No injected web3 found when initializing setProtocol: ${err}`);
}
​
const setProtocol = new SetProtocol(provider, config);

We can now start calling functions on the setProtocol instance like this:

// Example of calling createSetAsync method
const txHash = await setProtocol.createSetAsync(/* args */);

🎉 Congrats!

Now you’re ready to start building! Try your hand at some of our tutorials: