# Fee Sponsorship (/onramp/smart-routing-address/v0_2_1/fee-sponsorship)

> For the complete documentation index, see [llms.txt](/llms.txt)



<VersionWarning version="0.2.1" />

By default, Smart Routing Address deducts usage fees from the user's transferred tokens. However, as a developer, you can sponsor these fees so your users receive the full amount they deposit.

**Example**: When a user deposits 10 USDC to their smart routing address, they will receive exactly 10 USDC on the destination chain, while your dapp pays the usage fees separately.

## Sponsored Fee Configuration [#sponsored-fee-configuration]

To set up fee sponsorship, you must perform two steps:

1. **Configure SDK with Project ID**: Add your ZeroDev project ID to the `baseUrl` in your Smart Routing Address configuration.
2. **Select Tokens in Dashboard**: Go to the [Smart Routing Address Dashboard](https://dashboard.zerodev.app/projects/smart-routing-address) and select the tokens you wish to sponsor for your project.

```tsx
import {
  createSmartRoutingAddress,
  createCall,
  FLEX,
  SMART_ROUTING_ADDRESS_SERVER_URL,
} from "@zerodev/smart-routing-address";

const { smartRoutingAddress, estimatedFees } = await createSmartRoutingAddress({
  destChain,
  owner,
  slippage,
  actions: {
    USDC: {
      action: [erc20Call],
      fallBack: [],
    },
    WRAPPED_NATIVE: {
      action: [erc20Call],
      fallBack: [],
    },
    NATIVE: {
      action: [nativeCall],
      fallBack: [],
    },
  },
  srcTokens,
  config: {
    baseUrl: `${SMART_ROUTING_ADDRESS_SERVER_URL}/${ZERODEV_PROJECT_ID}`,
  },
});
```

Only tokens that are **both** configured with the project ID in the code **and** selected in the dashboard will be sponsored. For these tokens, usage fees are charged to your ZeroDev account, ensuring users receive the full deposit amount.

## Notes [#notes]

* Smart Routing Address integrates with bridges under the hood, so the usage pricing is on top of the underlying bridge fees.
* Pricing can be negotiated. Feel free to reach out.