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Jupiter Lend allows anyone to participate in the liquidation mechanism. In this section, we have included a minimal Typescript example to get you started.

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Prerequisites

The liquidation bot requires the Jupiter Lend SDK. You can find the full example at the end of this section.
We will be using functions from @jup-ag/lend/borrow and /flashloan.
npm install @jup-ag/lend
You will also need reliable RPC to fetch information like liquidations or swap quote and to execute the liquidation.

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Breakdown

The liquidation bot requires the following steps:
  1. Fetch all available liquidations
  2. Flash borrow the debt amount
  3. Get liquidation instructions
  4. Get Jupiter swap quote (collateral token -> debt token)
  5. Get Jupiter swap instructions
  6. Build all instructions together
  7. Execute the liquidation
  8. Flash payback the debt amount

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Fetch liquidations

By using the SDK, you can fetch for all available liquidations. 
const fetchAllLiquidations = await getAllLiquidations({
  connection,
  signer,
});
RPC Rate LimitThe getAllLiquidations function gives you the available liquidations across all vault, each request is processed in parallel, and each consumes ~10 RPC requests.If you receive 429 or rate limit error code from this function, it is likely due to your RPC connection getting rate limited. You should upgrade your RPC plan to avoid this issue.
Fetch liquidations for specific vaultIf you’d like to fetch liquidations for a specific vault, you can use the getLiquidations function.
const fetchLiquidationsByVaultId = await getLiquidations({
  vaultId,
  connection,
  signer,
});

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Flash borrow and payback

By using the SDK, you can flashloan to borrow the debt amount and flash payback what you flash borrowed. 
const fetchFlashBorrowIx = await getFlashBorrowIx({
  amount: debtAmount,
  asset: borrowToken,
  signer,
  connection,
});

const fetchFlashPaybackIx = await getFlashPaybackIx({
  amount: debtAmount,
  asset: borrowToken,
  signer,
  connection,
});
ALL flashloans are free!

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Get liquidation instructions

By using the SDK, you can get the liquidation instructions. 
const fetchLiquidateIx = await getLiquidateIx({
  vaultId,
  debtAmount,
  signer,
  connection,
});

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Get Jupiter quote and swap instructions

For this step, you will need to request to the Jupiter Swap API to get the quote and swap instructions.

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Full Example

import {
  getLiquidateIx,
  getAllLiquidations,
  getVaultsProgram,
} from "@jup-ag/lend/borrow";
import { getFlashBorrowIx, getFlashPaybackIx } from "@jup-ag/lend/flashloan";
import {
  Connection,
  PublicKey,
  ComputeBudgetProgram,
  TransactionMessage,
  VersionedTransaction,
  TransactionInstruction,
  AddressLookupTableAccount,
} from "@solana/web3.js";
import BN from "bn.js";
import axios from "axios";

const RPC_URL = "<RPC_URL>";
const SLIPPAGE_BPS = 100;

const signer = new PublicKey("1234567890");
const connection = new Connection(RPC_URL);
const program = getVaultsProgram({ connection, signer });
const configs = await program.account.vaultConfig.all();

async function fetchLiquidations() {
  try {
    const allAvailableLiquidations = await getAllLiquidations({
      connection,
      signer,
    });

    const validLiquidations: any = [];

    for (const vaultLiquidation of allAvailableLiquidations) {
      const { liquidations, vaultId } = vaultLiquidation;

      if (liquidations.length === 0) continue;

      // prettier-ignore
      for (const liquidation of liquidations) {
          const supplyToken = configs.find((config) => config.account.vaultId === vaultId)?.account.supplyToken;
          const borrowToken = configs.find((config) => config.account.vaultId === vaultId)?.account.borrowToken;

          validLiquidations.push({
            vaultId,
            liquidation,
            debtAmount: new BN(liquidation.amtIn),
            collateralAmount: new BN(liquidation.amtOut),
            supplyToken,
            borrowToken,
          });
        }
    }

    return validLiquidations;
  } catch (error) {
    console.error("Error fetching liquidations:", error);
    throw error;
  }
}

async function getJupiterQuote({
  inputMint,
  outputMint,
  amount,
  slippageBps = SLIPPAGE_BPS,
}) {
  try {
    const response = await axios.get("https://lite-api.jup.ag/swap/v1/quote", {
      params: {
        inputMint,
        outputMint,
        amount,
        slippageBps,
        restrictIntermediateTokens: true,
        maxAccounts: 32,
      },
    });

    return response.data;
  } catch (error) {
    console.error(
      "Error fetching Jupiter quote:",
      error.response?.data || error.message
    );
    throw error;
  }
}

async function getJupiterSwapInstructions({ quoteResponse, userPublicKey }) {
  try {
    const response = await axios.post(
      "https://lite-api.jup.ag/swap/v1/swap-instructions",
      {
        quoteResponse,
        userPublicKey,
      },
      {
        headers: { "Content-Type": "application/json" },
      }
    );

    if (response.data.error) {
      throw new Error(
        "Failed to get swap instructions: " + response.data.error
      );
    }

    return response.data;
  } catch (error) {
    console.error(
      "Error getting swap instructions:",
      error.response?.data || error.message
    );
    throw error;
  }
}

function deserializeInstruction(instruction) {
  return new TransactionInstruction({
    programId: new PublicKey(instruction.programId),
    keys: instruction.accounts.map((key) => ({
      pubkey: new PublicKey(key.pubkey),
      isSigner: key.isSigner,
      isWritable: key.isWritable,
    })),
    data: Buffer.from(instruction.data, "base64"),
  });
}

async function getAddressLookupTableAccounts(connection, keys) {
  if (!keys || keys.length === 0) return [];

  const addressLookupTableAccountInfos =
    await connection.getMultipleAccountsInfo(
      keys.map((key) => new PublicKey(key))
    );

  return addressLookupTableAccountInfos.reduce((acc, accountInfo, index) => {
    const addressLookupTableAddress = keys[index];
    if (accountInfo) {
      const addressLookupTableAccount = new AddressLookupTableAccount({
        key: new PublicKey(addressLookupTableAddress),
        state: AddressLookupTableAccount.deserialize(accountInfo.data),
      });
      acc.push(addressLookupTableAccount);
    }
    return acc;
  }, []);
}

async function executeLiquidation({
  vaultId,
  debtAmount,
  collateralAmount,
  supplyToken,
  borrowToken,
}) {
  try {
    console.log(`Executing liquidation for vault ${vaultId}...`);

    const instructions: TransactionInstruction[] = [];
    let allAddressLookupTableAccounts: AddressLookupTableAccount[] = [];

    // Step 1: Flash borrow the debt amount
    const flashBorrowIx = await getFlashBorrowIx({
      amount: debtAmount,
      asset: borrowToken,
      signer,
      connection,
    });

    instructions.push(flashBorrowIx);

    // Step 2: Get liquidation instructions
    const {
      ixs: liquidateIxs,
      addressLookupTableAccounts: liquidateLookupTables,
    } = await getLiquidateIx({
      vaultId,
      debtAmount,
      signer,
      connection,
    });

    instructions.push(...liquidateIxs);

    if (liquidateLookupTables && liquidateLookupTables.length > 0) {
      allAddressLookupTableAccounts.push(...liquidateLookupTables);
    }

    // Step 3: Get Jupiter swap quote (collateral token -> debt token)
    const quoteResponse = await getJupiterQuote({
      inputMint: supplyToken.toString(), // Collateral token
      outputMint: borrowToken.toString(), // Debt token
      amount: collateralAmount.toString(),
      slippageBps: SLIPPAGE_BPS,
    });

    // Step 4: Get Jupiter swap instructions
    const swapInstructions = await getJupiterSwapInstructions({
      quoteResponse,
      userPublicKey: signer.toString(),
    });

    const {
      setupInstructions,
      swapInstruction: swapInstructionPayload,
      cleanupInstruction,
      addressLookupTableAddresses,
    } = swapInstructions;

    if (setupInstructions && setupInstructions.length > 0) {
      instructions.push(...setupInstructions.map(deserializeInstruction));
    }

    instructions.push(deserializeInstruction(swapInstructionPayload));

    if (cleanupInstruction) {
      instructions.push(deserializeInstruction(cleanupInstruction));
    }

    // Step 5: Flash payback
    const flashPaybackIx = await getFlashPaybackIx({
      amount: debtAmount,
      asset: borrowToken,
      signer,
      connection,
    });
    instructions.push(flashPaybackIx);

    // Step 6: Get Jupiter address lookup tables
    if (addressLookupTableAddresses && addressLookupTableAddresses.length > 0) {
      const jupiterLookupTables = await getAddressLookupTableAccounts(
        connection,
        addressLookupTableAddresses
      );
      allAddressLookupTableAccounts.push(...jupiterLookupTables);
    }

    // Step 7: Build and send transaction
    const latestBlockhash = await connection.getLatestBlockhash();
    const messageV0 = new TransactionMessage({
      payerKey: signer,
      recentBlockhash: latestBlockhash.blockhash,
      instructions: [
        ComputeBudgetProgram.setComputeUnitLimit({
          units: 1_000_000,
        }),
        ...instructions,
      ],
    }).compileToV0Message(allAddressLookupTableAccounts);

    const transaction = new VersionedTransaction(messageV0);

    return transaction;
  } catch (error) {
    console.error(`Error executing liquidation for vault ${vaultId}:`, error);
    throw error;
  }
}

async function runLiquidationBot() {
  try {
    const liquidations = await fetchLiquidations();

    if (liquidations.length === 0) {
      console.log("No liquidations available at this time.");
      return;
    }

    for (const liquidationData of liquidations) {
      const {
        vaultId,
        debtAmount,
        collateralAmount,
        borrowToken,
        supplyToken,
      } = liquidationData;

      try {
        const signature = await executeLiquidation({
          vaultId,
          debtAmount,
          collateralAmount,
          borrowToken,
          supplyToken,
        });

        console.log(`Successfully liquidated vault ${vaultId}: ${signature}`);

        await new Promise((resolve) => setTimeout(resolve, 2000));
      } catch (error) {
        console.error(`Failed to liquidate vault ${vaultId}:`, error.message);
        continue;
      }
    }
  } catch (error) {
    console.error("Error in liquidation bot:", error);
  }
}
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