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

# Request Routes & Quotes

> Prior to executing a swap or a bridge, you need to request the best route from our API.

Use the `getRoutes` function to fetch routes/quotes from the Keygate API. Here is a simple example of how to request routes to bridge **10 USDC** on Optimism to the maximum amount of **ckUSDC** on Internet Computer Protocol

```typescript theme={null}
import { getRoutes, RouteResponse } from '@keygate/sdk'

const routes: RouteResponse[] = await getRoutes({
  inputAmount: '10000000', // 10 USDC
  fromChainId: 10, // Optimism
  fromToken: '0x0b2c639c533813f4aa9d7837caf62653d097ff85', // USDC on Optimism
  toChainId: 121171651099711, // Internet Computer Protocol
  toToken: '5okwm-giaaa-aaaar-qbn6a-cai' // osUSDC on Internet Computer Protocol
})
```

# Routes request parameters

Below are the parameters for the `getRoutes` function along with their descriptions:

**fromChainId** `number` `required`

The ID of the source chain.

| Chain Name                 | Chain ID        |
| -------------------------- | --------------- |
| Ethereum                   | 1               |
| Arbitrum                   | 42161           |
| Internet Computer Protocol | 121171651099711 |
| Base                       | 8453            |

**fromTokenAddress** `string` `required`

The contract address of the token on the source chain. Ensure this address corresponds to the specified fromChainId.

**fromAmount** `string` `required`

The amount to be transferred from the source chain, specified in the smallest unit of the token (e.g., wei for ETH).

**fromAddress** `string` `optional`

The address from which the tokens are being transferred.

**toChainId** `number` `required`

The ID of the destination chain.

| Chain Name                 | Chain ID        |
| :------------------------- | :-------------- |
| Ethereum                   | 1               |
| Arbitrum                   | 42161           |
| Internet Computer Protocol | 121171651099711 |
| Base                       | 8453            |

**toTokenAddress** `string` `required`

The contract address of the token on the destination chain. Ensure this address corresponds to the specified toChainId.