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The onFormChange event fires whenever the user modifies the swap form — for example, when changing the asset, amount, or destination network. 
import { CallbackProvider } from "@/context/CallbackContext"

<LayerswapProvider
  callbacks={{
    onFormChange: (formData) => {
      console.log("Form updated:", formData)
    },
  }}
>
  <Swap />
</LayerswapProvider>

​
Callback Argument Value

formData: {
  from: string;
  to: string;
  fromAsset: string;
  toAsset: string;
  amount: string;
  destination_address: string;
  refuel?: boolean;
}