# Leverage

Continuing from [/pages/GKzgnvQUcBRDl9fzmh69#id-4.-select-an-use-case](https://docs.protocolink.com/compound-kit/sdk/pages/GKzgnvQUcBRDl9fzmh69#id-4.-select-an-use-case "mention").

## 5. Preview the Estimated Post-Leverage Position & Approval  Permissions

Specify the `collateralToken` and `collateralAmount` that the user wants to leverage. Then It returns a `quotation` used for getting the estimated position. `approvals` need to be signed and submitted on-chain. `logics` is the detailed steps used for building transaction. Logics workflow is as follows:

1. Initiates a flash loan of the base token.
2. Swap the base token to the leverage token.
3. Supply the leverage token for the user.
4. Borrow the base token.
5. Repay the flash loan.

<pre class="language-typescript"><code class="lang-typescript">import * as compoundkit from '@protocolink/compound-kit';
import * as common from '@protocolink/common';
import * as logics from '@protocolink/logics';

const chainId = common.ChainId.polygon;
const marketId = compoundkit.MarketId.USDC;
const params = {
  account: '0xaAaAaAaaAaAaAaaAaAAAAAAAAaaaAaAaAaaAaaAa',
  collateralToken: logics.compoundv3.polygonTokens.WETH,
  collateralAmount: '1',
  slippage: 100,
};
<strong>const leverageQuotation = await compoundkit.getLeverageQuotation(chainId, marketId, params);
</strong>// {
//   "quotation": {
//     "leverageTimes": "0.02",
//     "currentPosition": {
//       "utilization": "0.6526",
//       "healthRate": "1.64",
//       "liquidationThreshold": "0.7774",
//       "supplyUSD": "0",
//       "borrowUSD": "76852.19",
//       "collateralUSD": "161883.97",
//       "netAPR": "-0.0434"
//     },
//     "targetPosition": {
//       "utilization": "0.6601",
//       "healthRate": "1.62",
//       "liquidationThreshold": "0.7779",
//       "supplyUSD": "0",
//       "borrowUSD": "78644.65",
//       "collateralUSD": "163675.97",
//       "netAPR": "-0.0444"
//     }
//   },
//   "fees": [
//     {
//       "rid": "utility:flash-loan-aggregator",
//       "feeAmount": {
//         "token": {
//           "chainId": 137,
//           "address": "0x0000000000000000000000000000000000001010",
//           "decimals": 18,
//           "symbol": "MATIC",
//           "name": "Matic Token"
//         },
//         "amount": "1.451848970467797743"
//       }
//     },
//     {
//       "rid": "compound-v3:borrow",
//       "feeAmount": {
//         "token": {
//           "chainId": 137,
//           "address": "0x0000000000000000000000000000000000001010",
//           "decimals": 18,
//           "symbol": "MATIC",
//           "name": "Matic Token"
//         },
//         "amount": "5.80739750171045147"
//       }
//     }
//   ],
//   "approvals": [
//     {
//       "to": "0xF25212E676D1F7F89Cd72fFEe66158f541246445",
//       "data": "0x110496e50000000000000000000000000e7c086090b361c955950956105df200b20f66d70000000000000000000000000000000000000000000000000000000000000001"
//     }
//   ],
//   "logics": [
//     {
//       "rid": "utility:flash-loan-aggregator",
//       "fields": {
//         "id": "e8c17e8d-3efc-4c68-92bf-5ac9ba82f41e",
//         "protocolId": "balancer-v2",
//         "loans": [
//           {
//             "token": {
//               "chainId": 137,
//               "address": "0x2791Bca1f2de4661ED88A30C99A7a9449Aa84174",
//               "decimals": 6,
//               "symbol": "USDC",
//               "name": "USD Coin (PoS)"
//             },
//             "amount": "1792.584826"
//           }
//         ],
//         "isLoan": true
//       }
//     },
//     {
//       "rid": "paraswap-v5:swap-token",
//       "fields": {
//         "input": {
//           "token": {
//             "chainId": 137,
//             "address": "0x2791Bca1f2de4661ED88A30C99A7a9449Aa84174",
//             "decimals": 6,
//             "symbol": "USDC",
//             "name": "USD Coin (PoS)"
//           },
//           "amount": "1792.584826"
//         },
//         "output": {
//           "token": {
//             "chainId": 137,
//             "address": "0x7ceB23fD6bC0adD59E62ac25578270cFf1b9f619",
//             "decimals": 18,
//             "symbol": "WETH",
//             "name": "Wrapped Ether"
//           },
//           "amount": "1"
//         },
//         "slippage": 100
//       }
//     },
//     {
//       "rid": "compound-v3:supply-collateral",
//       "fields": {
//         "marketId": "USDC",
//         "input": {
//           "token": {
//             "chainId": 137,
//             "address": "0x7ceB23fD6bC0adD59E62ac25578270cFf1b9f619",
//             "decimals": 18,
//             "symbol": "WETH",
//             "name": "Wrapped Ether"
//           },
//           "amount": "1"
//         },
//         "balanceBps": 10000
//       }
//     },
//     {
//       "rid": "compound-v3:borrow",
//       "fields": {
//         "marketId": "USDC",
//         "output": {
//           "token": {
//             "chainId": 137,
//             "address": "0x2791Bca1f2de4661ED88A30C99A7a9449Aa84174",
//             "decimals": 6,
//             "symbol": "USDC",
//             "name": "USD Coin (PoS)"
//           },
//           "amount": "1792.584826"
//         }
//       }
//     },
//     {
//       "rid": "utility:flash-loan-aggregator",
//       "fields": {
//         "id": "e8c17e8d-3efc-4c68-92bf-5ac9ba82f41e",
//         "protocolId": "balancer-v2",
//         "loans": [
//           {
//             "token": {
//               "chainId": 137,
//               "address": "0x2791Bca1f2de4661ED88A30C99A7a9449Aa84174",
//               "decimals": 6,
//               "symbol": "USDC",
//               "name": "USD Coin (PoS)"
//             },
//             "amount": "1792.584826"
//           }
//         ],
//         "isLoan": false
//       }
//     }
//   ]
// }
</code></pre>

## 6. Obtain Transaction Data for Execution

Provides transaction data that is needed to execute this operation. Armed with the `logics` from the previous step, it generates the `to`, `data` and `value` including fees then signs and submits to finalize the operation.

If you wish to include a referral for fee sharing, you can append the `referral` property to the `routerData` object. For detailed information on using `routerData`, please refer to the [Router Data Documentation](/protocolink-sdk/api-sdk-interfaces/global-types.md#routerdata).

```typescript
import * as compoundkit from '@protocolink/compound-kit';
import * as common from '@protocolink/common';
import * as apisdk from '@protocolink/api';

const routerData: apisdk.RouterData = {
  chainId: common.ChainId.polygon,
  account: '0xaAaAaAaaAaAaAaaAaAAAAAAAAaaaAaAaAaaAaaAa',
  logics: leverageQuotation.logics,
  referral: '0xbBbBBBBbbBBBbbbBbbBbbbbBBbBbbbbBbBbbBBbB',
};
const transactionRequest = await compoundkit.buildLeverageTransactionRequest(routerData);
// {
//   "to": "0xf4dEf6B4389eAb49dF2a7D67890810e5249B5E70",
//   "data": "0x...",
//   "value": "7245995915658097461"
// }
```


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