For more details about how fees work, fee collection on different chains, and setting up fee wallets, see the Monetizing the integration guide.
When using the LI.FI SDK, you can monetize your integration by collecting fees from the transactions processed through your application. The SDK supports fee configuration in two ways: globally when creating the SDK config, or per-request through route options.

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Global fee configuration

The recommended approach is to configure fees globally when creating your SDK config using createConfig. This ensures all requests use the same fee configuration automatically: 
import { createConfig } from "@lifi/sdk";

const config = createConfig({
  integrator: "Your dApp/company name",
  routeOptions: {
    fee: 0.01, // 1% fee applied to all requests
  },
  // other options...
});
With this configuration, all route requests, quotes, and contract calls will automatically include the specified fee without needing to add it to each individual request.

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Per-request fee configuration

Alternatively, you can configure fees on a per-request basis. This is useful when you need different fee rates for different types of transactions or users. The fee parameter can be added to the options object when requesting routes or quotes.

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Basic route request with fees

import { getRoutes } from "@lifi/sdk";

const routesRequest: RoutesRequest = {
  fromChainId: 42161, // Arbitrum
  toChainId: 10, // Optimism
  fromTokenAddress: "0xaf88d065e77c8cC2239327C5EDb3A432268e5831", // USDC on Arbitrum
  toTokenAddress: "0xDA10009cBd5D07dd0CeCc66161FC93D7c9000da1", // DAI on Optimism
  fromAmount: "10000000", // 10 USDC
  options: {
    integrator: "Your dApp/company name",
    fee: 0.01, // 1% fee
  },
};

const result = await getRoutes(routesRequest);
const routes = result.routes;

​
Quote request with fees

import { getQuote } from "@lifi/sdk";

const quoteRequest: QuoteRequest = {
  fromChain: 42161, // Arbitrum
  toChain: 10, // Optimism
  fromToken: "0xaf88d065e77c8cC2239327C5EDb3A432268e5831", // USDC on Arbitrum
  toToken: "0xDA10009cBd5D07dd0CeCc66161FC93D7c9000da1", // DAI on Optimism
  fromAmount: "10000000", // 10 USDC
  fromAddress: "0x552008c0f6870c2f77e5cC1d2eb9bdff03e30Ea0",
  integrator: "Your dApp/company name",
  fee: 0.01, // 1% fee
};

const quote = await getQuote(quoteRequest);