> For the complete documentation index, see [llms.txt](https://docs.zyfi.org/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.zyfi.org/integration-guide/intent-based.md).

# Intent Based

The **Intent narrative in blockchain** refers to a user's specific goal that is submitted to a service and then executed by a 'solver,' which can be a person, an API, or another protocol to achieve the desired outcome.

At Zyfi, we've developed a complete Intent Solver, which consists of Zyfi's APIs associated with **Zyfi's paymaster contract**. This innovation addresses the user's intent to have gasless transactions sponsored by a third party, such as an NFT collection, a DApp, or a foundation.

## Intent Adjacent Function

Zyfi goes a step further by introducing a specific **Intent Adjacent function** to the API solver. Instead of requiring a DApp to pay gas fees for the end user, a third party like a brand, foundation, or NFT collection can sponsor the gas without needing direct API integration.

This parameter, called `CheckNFT`, is part of the API call of the [sponsored paymaster](/integration-guide/paymasters-integration/sponsored-paymaster.md). DApps that use associated NFT contract addresses can switch this parameter from **false to true** during the API call. This allows DApps to sponsor gas for **holders of any Zyfi NFT partner**, with the NFT collection consent.

## How to Use `checkNFT`

As a Dapp, you just need to switch the `checkNFT` parameter from `false` to `true` and ensure that the sponsoring NFT collection is registered beforehand with an associated Zyfi's Vault balance.

```typescript
const payload = {
   chainId: 324,
   feeTokenAddress: // Not needed if your sponsor 100% of the gas
   sponsorshipRatio: 100
   checkNFT: true, // All Zyfi's NFT partners vault could now sponsor gas for their holders on your Dapp
   replayLimit:
     from: "0x...",
     to: "0x...",
     data: "0x.."
   }
};
```

By simply activating this parameter, Zyfi enables gasless transactions for specific holders through a straightforward parameter switch.

<figure><img src="/files/qa5antxnWrJNnlJtpqJc" alt=""><figcaption><p>Zyfi's intent adjecent function</p></figcaption></figure>

When the `checkNFT` parameter is switched to `true`, all of Zyfi's NFT partner vaults could sponsor gas for their holders on your Dapp. This offers a flexible solution for Dapps to integrate; for third parties to sponsor, and an amazing solution for NFT holders who enjoy gas-free transactions.