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- = Gas Station Network (GSN)
- _Available since v2.4.0._
- This set of contracts provide all the tools required to make a contract callable via the https://gsn.openzeppelin.com[Gas Station Network].
- TIP: If you're new to the GSN, head over to our xref:openzeppelin::gsn/what-is-the-gsn.adoc[overview of the system] and basic guide to xref:ROOT:gsn.adoc[creating a GSN-capable contract].
- The core contract a recipient must inherit from is {GSNRecipient}: it includes all necessary interfaces, as well as some helper methods to make interacting with the GSN easier.
- Utilities to make writing xref:ROOT:gsn-strategies.adoc[GSN strategies] easy are available in {GSNRecipient}, or you can simply use one of our pre-made strategies:
- * {GSNRecipientERC20Fee} charges the end user for gas costs in an application-specific xref:ROOT:tokens.adoc#ERC20[ERC20 token]
- * {GSNRecipientSignature} accepts all relayed calls that have been signed by a trusted third party (e.g. a private key in a backend)
- You can also take a look at the two contract interfaces that make up the GSN protocol: {IRelayRecipient} and {IRelayHub}, but you won't need to use those directly.
- NOTE: This feature is being released in the next version of OpenZeppelin Contracts, available right now through `npm install @openzeppelin/contracts@next`.
- == Recipient
- {{GSNRecipient}}
- == Strategies
- {{GSNRecipientSignature}}
- {{GSNRecipientERC20Fee}}
- == Protocol
- {{IRelayRecipient}}
- {{IRelayHub}}
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