How-to: Collect custom swap fees

You can configure your swaps to collect a custom fee from end users on each swap call. For how custom fees fit into the overall fees breakdown, see How swap fees work.

If you use this feature, Arc keeps 10% of the custom fee you collect from your end users.

Prerequisites

Before you begin, ensure that you’ve:

Installed the App Kit SDK
Configured an adapter

These are required so any example below runs with a valid kit and adapter.

Set a custom fee on a swap

This example adds a 1% (100 basis points) fee to a single swap call:

TypeScript

const output = await kit.swap({
  from: { adapter, chain: "Arc_Testnet" },
  tokenIn: "USDC",
  amountIn: "1.00",
  tokenOut: "EURC",
  config: {
    kitKey: process.env.KIT_KEY as string, // optional — configure for production or high-volume usage
    customFee: {
      percentageBps: 100, // 1% fee
      recipientAddress: "0xYourFeeRecipientAddress",
    },
  },
});

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How-to: Collect custom swap fees

Prerequisites

Set a custom fee on a swap

​Prerequisites

​Set a custom fee on a swap

Prerequisites

Set a custom fee on a swap