# 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](https://docs.zyfi.org/integration-guide/paymasters-integration/sponsored-paymaster). 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.
Zyfi's intent adjecent function
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.
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