> For the complete documentation index, see [llms.txt](https://tucana-1.gitbook.io/tucana-developer-docs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://tucana-1.gitbook.io/tucana-developer-docs/spot-dex/router-sdk/features/find-best-paths.md).

# Find Best Paths

**Function input params**

* `fromToken`:  the token address about from.
* `toToken`: the token address about to.
* `byAmountIn`: If set true, it means fixed amount of input token, otherwise fixed amount of output token.
* `amount`: when byAmountIn set true, it means amount of input token, otherwise means amount of output token.
* `maxHops`(Option): the max hops number, default set 2.

**Result Params**

* `combinedPaths`: the detail about router path.
  * `basicPaths`: the detail about one hop(in one pool)
    * `poolAddress`: the address of clmm pool
    * `decimal0`: the decimal of token0 of pool.
    * `decimal1`: the decimal of token1 of pool.
    * `a2b`: the swap direction.
    * `byAmountIn`: the fixed direction in this pool, the same as input params.
    * `isExceed`: is exceed in this pool.
    * `feeAmount`: the amount of fee.
    * `feeRate`: the fee rate of pool.
    * `currentSqrtPrice`: the sqrt price of pool before swap.
    * `afterSqrtPrice`: the sqrt price of pool after swap.
    * `amountIn`(Option): the amount of input in this pool.
    * `amountOut`(Option): the amount of output in this pool.
  * `amountIn`: the amount of input in this combined path.
  * `amountOut`: the amount of output in this combined path.
  * `isExceed`: is this combined path exceed.
  * `feeAmount`: the total amount of fee in this combined path.
  * `percent`: the percent of input/output amount(base of byAmountIn).
* `amountIn`: the amount of input.
* `amountOut`: the amount of output.
* `isExceed`: the router result is exceed.
* `feeAmount`: the amount of fee.
* `byAmountIn`: the same as input params.
* `priceImpact`: the impact between swaped price and init price.
* `amountTooSmall`: if input amount is too small when fixed input amount(byAmountIn = true).

```typescript
    combinedPaths: RouterCombinedPath[]
    amountIn: number
    amountOut: number
    isExceed: boolean
    feeAmount: number
    byAmountIn: boolean
    priceImpact: number
    amountTooSmall: boolean
```

**Example**

```typescript
const token0 = 0x4b7cf6f28fdff5237c85b77f2ba4adabdca4f5c69877d314ba28e776d4d2730f
const token1 = 0x9976e868ba06d58fb8566b294efcf5ac6929aa7a0f306afc90313abc0d6a3ec4
const res = await tucanaRouterClient.findBestPaths(token0, token1, true, 100000000)
```