Apy on Aptos nodejs and web client

The Apy on Aptos client provides a convenient way to interact with the Apy protocol on Aptos blockchain using JavaScript. It offers a set of utility functions, classes, and types to simplify the integration process and enhance developer productivity.

This library provides a clean wrapper around all the methods exposed by a Apy-on-Aptos contract, as well as the APY indexer REST API. The library is written in TypeScript and defines all the types exposed by underlying services.

Main features

• Thin wrapper around the standard Aptos client.
• Fully written in TypeScript, with strict types for security and safety.
• Integration with popular Aptos wallets, such as Pontem.
• Complete functionality for making calls to the contract and effective retriving market state from the Apy indexer.

Installation

For use in Node.js or a web application

$ pnpm install 

Once the package is installed, you can import the library using import or require approach:

import { ApyClient, AccountProvider } from "@apy/client"
import { Apy } from "@apy/client/markets"

Example

To run the example it needs the Apy-on-Aptos to be published and lend-borrow markets to be configured.
For details refer to Apy-on-Aptos testnet deployment instruction

import { ApyClient, AccountProvider } from "@apy/client"
import { AptosClient, AptosAccount, HexString } from "aptos"
import { Apy } from "@apy/client/markets"

// coin types
const USDC = process.env.USDC!
const BTC = process.env.BTC!
const ETH = process.env.ETH!

const APY = new HexString(process.env.APY!)
const NODE_URL = process.env.APTOS_NODE_URL!

// create apy client powered by simple account provider. In real world applications use Pontem wallet.  
export function getApyClient(signer: AptosAccount, client: AptosClient, apy: HexString): ApyClient {
  return new ApyClient(new AccountProvider(client, signer), apy);
}

export function isSet<T>(val?: T): T {
  if (val === undefined) {
    throw new Error("value is unknown")
  }
  return val
}

// It supposed, we have configured BTC, USDC and ETH markets.
const markets = new Apy(APY)
await markets.updateMarkets(new AptosClient(NODE_URL))

const borrower = new AptosAccount();
const lender = new AptosAccount();
// ... endow borrower with USDC and lender with BTC

const client = new AptosClient(NODE_URL);

let borrowerClient = getApyClient(borrower, client, APY)
let lenderClient = getApyClient(lender, client, APY)

// fetch markets into application cache
const apy = new Apy(APY)
await apy.updateMarkets(client)

const usdcMarket = isSet(apy.getMarketByCoinPeriod(USDC, "Hour"))
const ethMarket = isSet(apy.getMarketByCoinPeriod(ETH, "Hour"))
const btcMarket = isSet(apy.getMarketByCoinPeriod(BTC, "Hour"))

// deposit USDC as a collateral

await borrowerClient.deposit(usdcMarket, '100_000')

// deposit BTC and place a lend order
await lenderClient.deposit(btcMarket, '1.0')
await lenderClient.lend(btcMarket, '1.0', 1) // 1%

// cancel previous order and place new one at 2% 
await lenderClient.lend_cancel(btcMarket)
await lenderClient.lend(btcMarket, '1.0', 2.0) // 2%

// create borrow request on the 0.01 BTC
await borrowerClient.borrow(btcMarket, '0.01', 0) // 0.01 BTC at market rate(2%) 

// withdraw borrowed BTC
await borrowerClient.withdraw(btcMarket, '0.01')

Getting APY market states