> ## Documentation Index
> Fetch the complete documentation index at: https://docs.enso.build/llms.txt
> Use this file to discover all available pages before exploring further.

# Collateral Swap

> Switch the collateral backing your debt without closing the debt position

<Tip>
  **Note on Approvals**: When using `routingStrategy`: `router`, you must first approve the Enso contract to spend your tokens.
  The code samples below include the necessary `client.getApprovalData()` step, which generates the required approval transaction
  to be signed before the main routing transaction.
</Tip>

To swap the collateral, we need three actions:

* `redeem` a part of exising `WETH` collateral for the `aWETH` position
* `route` to swap the redeemed collateral (WETH) to a different position (WBTC)
* `deposit` the swapped position (WBTC) as collateral for the existing debt

```mermaid theme={null}
flowchart LR
    aWETH((aWETH)) -->|aave-v3<br/>redeem| WETH((WETH))
    WETH -->|enso<br/>route| WBTC((WBTC))
    WBTC -->|aave-v3<br/>deposit| aWBTC((aWBTC))
```

```ts theme={null}
const fromAddress = "0xd8da6bf26964af9d7eed9e03e53415d37aa96045" as Address;
const aWETH = "0x4d5F47FA6A74757f35C14fD3a6Ef8E3C9BC514E8";
const WETH = "0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2";
const WBTC = "0x2260fac5e5542a773aa44fbcfedf7c193bc2c599";
const aWBTC = "0x5Ee5bf7ae06D1Be5997A1A72006FE6C607eC6DE8";

// aave v3 position manager
const AAVE_V3 = "0x87870Bca3F3fD6335C3F4ce8392D69350B4fA4E2"; 

const bundle = await client.getBundleData(
  {
    chainId: 1,
    fromAddress,
    routingStrategy: "delegate",
  },
  [
    {
      protocol: "aave-v3",
      action: "redeem",
      args: {
        primaryAddress: AAVE_V3,
        tokenIn: aWETH, 
        tokenOut: WETH, 
        amountIn: "1000000000000000000",
      },
    },
    {
      protocol: "enso",
      action: "route",
      args: {
        tokenIn: WETH, 
        tokenOut: WBTC,
        amountIn: { useOutputOfCallAt: 0 },
      },
    },
    {
      protocol: "aave-v3",
      action: "deposit",
      args: {
        primaryAddress: AAVE_V3,
        tokenIn: WBTC, 
        tokenOut: aWBTC, 
        amountIn: { useOutputOfCallAt: 1 },
      },
    },
  ]
);
console.log(JSON.stringify(bundle, null, 2));
```