> For the complete documentation index, see [llms.txt](https://docs-zkevm.cronos.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs-zkevm.cronos.com/for-developers/developer-tools/zyfi-paymaster.md).

# Zyfi (Paymaster)

Zyfi is a Paymaster-as-a-Service that focuses on flexibility and ease of integration. It was created as a way to accelerate the adoption of paymasters in the zkSync ecosystem.

DApps can either propose to their users to pay with any ERC-20 traded on zkSync (currently more than 80), or decide to sponsor part or all of the transaction gas cost with their own custom logic.

All is powered by a Paymaster [API](https://docs.zyfi.org/integration-guide/quick-start) that abstracts complexities away from developers, so that they can focus on building their product.

Website: <https://docs.zyfi.org/>

### Deployment status

* :white\_check\_mark: **Cronos zkEVM Mainnet (Chain-id : `388` )**

Deployment completed. The docs are the same for all chains. Use the Cronos zkEVM chain ID (388).

* :white\_check\_mark: **Cronos zkEVM Sepolia Testnet (Chain-id : `282` )**

Deployment completed. The docs are the same for all chains. Use the Cronos zkEVM testnet chain ID (282).