Flash Loans SDK

npm install @cowprotocol/sdk-flash-loans @cowprotocol/sdk-trading
# or
pnpm add @cowprotocol/sdk-flash-loans @cowprotocol/sdk-trading
# or
yarn add @cowprotocol/sdk-flash-loans @cowprotocol/sdk-trading

import { AaveCollateralSwapSdk } from '@cowprotocol/sdk-flash-loans'

// Default configuration
const flashLoanSdk = new AaveCollateralSwapSdk()

// Custom gas limits
const flashLoanSdk = new AaveCollateralSwapSdk({
  hooksGasLimit: {
    pre: 500000n,
    post: 800000n,
  },
})

import { AaveCollateralSwapSdk } from '@cowprotocol/sdk-flash-loans'
import { TradingSdk } from '@cowprotocol/sdk-trading'
import { SupportedChainId, OrderKind } from '@cowprotocol/sdk-config'

const flashLoanSdk = new AaveCollateralSwapSdk()

const result = await flashLoanSdk.collateralSwap(
  {
    chainId: SupportedChainId.GNOSIS_CHAIN,
    tradeParameters: {
      sellToken: '0xe91D153E0b41518A2Ce8Dd3D7944Fa863463a97d', // WXDAI
      sellTokenDecimals: 18,
      buyToken: '0x2a22f9c3b484c3629090FeED35F17Ff8F88f76F0', // USDC.e
      buyTokenDecimals: 6,
      amount: '20000000000000000000', // 20 WXDAI
      kind: OrderKind.SELL,
      validFor: 600,
      slippageBps: 50,
    },
    collateralToken: '0xd0Dd6cEF72143E22cCED4867eb0d5F2328715533', // aGnoWXDAI
    flashLoanFeePercent: 0.05,
  },
  tradingSdk
)

console.log('Order created:', result.orderId)

const quoteParams = await flashLoanSdk.getSwapQuoteParams(params)
const { quoteResults } = await tradingSdk.getQuote(quoteParams)

console.log('Buy amount:', quoteResults.amountsAndCosts.afterSlippage.buyAmount)

const { swapSettings, instanceAddress } = await flashLoanSdk.getOrderPostingSettings(
  params,
  quoteParams,
  quoteResults
)

console.log('Adapter address:', instanceAddress)

const allowance = await flashLoanSdk.getCollateralAllowance({
  trader: ownerAddress,
  collateralToken: '0xd0Dd6cEF72143E22cCED4867eb0d5F2328715533',
  amount: BigInt('20000000000000000000'),
  instanceAddress,
})

console.log('Current allowance:', allowance.toString())

if (allowance < requiredAmount) {
  const txResponse = await flashLoanSdk.approveCollateral({
    trader: ownerAddress,
    collateralToken: '0xd0Dd6cEF72143E22cCED4867eb0d5F2328715533',
    amount: BigInt('20000000000000000000'),
    instanceAddress,
  })

  console.log('Approval transaction:', txResponse.hash)
}

import { AaveCollateralSwapSdk } from '@cowprotocol/sdk-flash-loans'
import { TradingSdk, OrderKind, SupportedChainId } from '@cowprotocol/sdk-trading'
import { ViemAdapter } from '@cowprotocol/sdk-viem-adapter'
import { createPublicClient, http, privateKeyToAccount } from 'viem'
import { gnosis } from 'viem/chains'

// Set up adapter
const adapter = new ViemAdapter({
  provider: createPublicClient({
    chain: gnosis,
    transport: http('YOUR_RPC_URL')
  }),
  signer: privateKeyToAccount('YOUR_PRIVATE_KEY' as `0x${string}`)
})

// Initialize Trading SDK
const tradingSdk = new TradingSdk(
  {
    chainId: SupportedChainId.GNOSIS_CHAIN,
    appCode: 'aave-flash-loan-app',
  },
  {},
  adapter
)

// Initialize Flash Loan SDK
const flashLoanSdk = new AaveCollateralSwapSdk()

// Execute swap
const result = await flashLoanSdk.collateralSwap(
  {
    chainId: SupportedChainId.GNOSIS_CHAIN,
    tradeParameters: {
      sellToken: '0xe91D153E0b41518A2Ce8Dd3D7944Fa863463a97d', // WXDAI
      sellTokenDecimals: 18,
      buyToken: '0x2a22f9c3b484c3629090FeED35F17Ff8F88f76F0', // USDC.e
      buyTokenDecimals: 6,
      amount: '20000000000000000000', // 20 WXDAI
      kind: OrderKind.SELL,
      validFor: 600,
      slippageBps: 50,
    },
    collateralToken: '0xd0Dd6cEF72143E22cCED4867eb0d5F2328715533', // aGnoWXDAI
    flashLoanFeePercent: 0.05,
  },
  tradingSdk
)

console.log('Flash loan order created:', result.orderId)

const params = {
  chainId: SupportedChainId.GNOSIS_CHAIN,
  tradeParameters: {
    sellToken: '0xe91D153E0b41518A2Ce8Dd3D7944Fa863463a97d',
    sellTokenDecimals: 18,
    buyToken: '0x2a22f9c3b484c3629090FeED35F17Ff8F88f76F0',
    buyTokenDecimals: 6,
    amount: '20000000000000000000',
    kind: OrderKind.SELL,
  },
  collateralToken: '0xd0Dd6cEF72143E22cCED4867eb0d5F2328715533',
  flashLoanFeePercent: 0.05,
}

// Step 1: Get quote parameters
const quoteParams = await flashLoanSdk.getSwapQuoteParams(params)

// Step 2: Get quote
const { quoteResults, postSwapOrderFromQuote } = await tradingSdk.getQuote(quoteParams)

// Step 3: Review quote
const buyAmount = quoteResults.amountsAndCosts.afterSlippage.buyAmount
console.log(`Will receive at least: ${buyAmount} tokens`)

// Step 4: Get order settings
const { swapSettings, instanceAddress } = await flashLoanSdk.getOrderPostingSettings(
  params,
  quoteParams,
  quoteResults
)

// Step 5: Check and approve collateral
const sellAmount = BigInt(params.tradeParameters.amount)
const allowance = await flashLoanSdk.getCollateralAllowance({
  trader: quoteParams.owner,
  collateralToken: params.collateralToken,
  amount: sellAmount,
  instanceAddress,
})

if (allowance < sellAmount) {
  const txResponse = await flashLoanSdk.approveCollateral({
    trader: quoteParams.owner,
    collateralToken: params.collateralToken,
    amount: sellAmount,
    instanceAddress,
  })
  console.log('Approval tx:', txResponse.hash)
}

// Step 6: Post order with manual approval
const result = await flashLoanSdk.collateralSwap(
  {
    ...params,
    settings: {
      preventApproval: true, // Skip auto-approval
    },
  },
  tradingSdk
)

console.log('Order created:', result.orderId)

const AAVE_TOKENS = {
  aGnoWXDAI: '0xd0Dd6cEF72143E22cCED4867eb0d5F2328715533',
  aGnoUSDC: '0xc6B7AcA6DE8a6044E0e32d0c841a89244A10D284',
}

// With 0.05% fee on 20 WXDAI:
// - Flash loan: 20 WXDAI
// - Fee: 0.01 WXDAI
// - Actual swap: 19.99 WXDAI

{
  amount: '20000000000000000000',
  flashLoanFeePercent: 0.05, // 0.05%
}