Permaswap-js

Installation

Using yarn

yarn add permaswap

Using npm

npm install permaswap

Configuration

Example

import Permaswap from 'permaswap'
import { ethers } from 'ethers'
import Everpay from 'everpay'

const wallet = {
  address: '0x26361130d5d6E798E9319114643AF8c868412859',
  privateKey: '94c97d4cc865d77afaf2d64147f7c067890e1485eb5d8e2c15cc0b7528a08b47'
}

const provider = new ethers.providers.InfuraProvider('kovan')
const signer = new ethers.Wallet(wallet.privateKey, provider)
const everpay = new Everpay({
  debug: true,
  account: wallet.address,
  ethConnectedSigner: signer
})

const permaswap = new Permaswap({
  debug: true,
  account: wallet.address,
  everpay
})

Methods

permaswap.init(callback)

Establish a websocket connection with Permaswap Router, callback will be executed after the connection is established.

permaswap.subscribe({ payAmount, paySymbol, receiveSymbol }, subscribeHandler)

Subscribe to order via paySymbol, receiveSymbol, payAmount. order is continuously pushed to the subscribeHandler function.

subscribeHandler function, which takes two parameters, error and order.

order contains field examples

{
  event: 'order',
  userAddr: '0x26361130d5d6E798E9319114643AF8c868412859',
  tokenIn: 'ethereum-eth-0x0000000000000000000000000000000000000000',
  tokenOut: 'ethereum-usdt-0xd85476c906b5301e8e9eb58d174a6f96b9dfc5ee',
  price: '0.0003053731',
  priceImpact: '0.0039111582',
  bundle: {
    items: [
      //...
    ],
    expiration: 1666855442,
    salt: '2076d49c-7d53-44db-a664-3b4dcc33e46c',
    version: 'v1'
  },
  paths: [
    //...
  ],
  rate: '3274.6826',
  receiveAmount: '32.746822',
  orderHash: '0x6985580ad60114fcdeabda7455cf43bcb3a5db0a4a80db33a1816ab1718f442a'
}

Where rate and receiveAmount can be used by the developer to determine if the order is worthy of being filled.

orderHash is the unique identifier for the order.

permaswap.trade(tokenIn, tokenOut, bundle, paths, tradeHandler)

tokenIn, tokenOut, bundle, paths are all from order. The traderHandler function accepts one argument as the following example.

{
  event: 'status',
  orderHash: '0xb9586b38e624dd31654f3449f16ad23095ae7b6ce16c8abe2955f1028c85b101',
  everHash: '0x6153cac909ef7ba329412015985e68ab1e405f51934184d86b283953598d2971',
  status: 'success'
}

When status is 'success', it means the order was successful.

permaswap.close()

Close the WebSocket connection between Permaswap and Router.

Other

For more examples see test.ts

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