Neptunian Parity Mnemonic


    4.0.0 • Public • Published

    This library is now deprecated. Please use from our new monorepo.

    SynthetixJs library

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    The Synthetix-JS Library provides a simple pre-packaged API to communicate with Synthetix on ethereum. You can use it to contribute to DeFi's growing synthetic asset ecosystem.

    This is particularly useful for hackathon teams to quickly npm install synthetix-js and start building in just a few minutes.

    Under the hood, SynthetixJs uses ethers.js library and its concept of providers and transaction signers.

    Install via npm

    npm install synthetix-js

    Developer Docs

    Example for getting the total sUSD stablecoin in circulation

    const { SynthetixJs } = require('synthetix-js');
    const snxjs = new SynthetixJs(); //uses default ContractSettings - ethers.js default provider, mainnet
    (async function() {
      const totalSUSD = await snxjs.sUSD.totalSupply();
      const totalSUSDSupply = snxjs.utils.formatEther(totalSUSD);
      console.log('sUSDTotalSupply', totalSUSDSupply);

    Default settings don't use any signer. That means that constants can be viewed from the contract but executing a transaction will fail. To execute transactions, set up signer.

    4 signers are included in the library - Metamask (compatible with Dapp browsers), Trezor, Ledger and PrivateKey. Custom ethers.js compatible signers can be used too.

    Example using a metamask signer

    const { SynthetixJs } = require('synthetix-js');
    const metaMaskSigner = new SynthetixJs.signers.Metamask();
    const snxjs = new SynthetixJs({ signer: metaMaskSigner }); //uses Metamask signer and default provider on mainnet

    Example of minting stablecoin(sUSD) with private key signer

    const { SynthetixJs } = require('synthetix-js');
    //parameters: default provider, default networkId, private key as a string
    const signer = new SynthetixJs.signers.PrivateKey(
    const snxjs = new SynthetixJs({ signer });
    async function run() {
      const totalSupply = await snxjs.Synthetix.totalSupply();
      const snxTotalSupply = snxjs.utils.formatEther(totalSupply);
      console.log('snxTotalSupply', snxTotalSupply);
      //issue 100 synths (will throw if insufficient funds for gas)
      try {
        const txObj = await snxjs.Synthetix.issueSynths(snxjs.util.parseEther('100')); //execute transaction (requires gas)
        console.log('transaction hash', txObj.hash);
      } catch (e) {

    Live examples

    • Get total synth supply Get total supply
    • Get collateralized state image

    Got any questions?

    Join our dev community on Discord: Discord




    npm i synthetix-js-v2

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