Single-Collateral Sai


Single-Collateral Dai support in Dai.js is implemented as a plugin. The SCD plugin is also available as an npm package and its source code can be found on Github.

npm install @makerdao/dai-plugin-scd

import { ScdPlugin } from '@makerdao/dai-plugin-scd';
// or
const { ScdPlugin } = require('@makerdao/dai-plugin-scd');

Quick example

The code below creates a CDP, locks ETH into it, and draws out Sai.

import Maker from '@makerdao/dai';
import { ScdPlugin } from '@makerdao/dai-plugin-scd';
async function openLockDraw() {
const maker = await Maker.create("http", {
plugins: [ScdPlugin],
url: ''
await maker.authenticate();
const cdpService = await maker.service('cdp');
const cdp = await cdpService.openCdp();
await cdp.lockEth(0.25);
await cdp.drawSai(50);
const debt = await cdp.getDebtValue();
console.log(debt.toString); // '50.00 SAI'

The services and objects below are used to work with Single-Collateral Sai.


  • Returns: promise (resolves to new CDP object once mined)

openCdp() will create a new CDP, and then return the CDP object, which can be used to access other CDP functionality. The promise will resolve when the transaction is mined.

const cdpService = await maker.service('cdp');
const newCdp = await cdpService.openCdp();

getCdp(int id)

  • Returns: promise (resolves to CDP object)

getCdp(id) creates a CDP object for an existing CDP. The CDP object can then be used to interact with your CDP.

const cdpService = await maker.service('cdp');
const cdp = await cdpService.getCdp(614);

Once you have an instance of a CDP, you can use CDP instance methods to read its state and perform actions.