> For the complete documentation index, see [llms.txt](https://clanker.gitbook.io/documentation/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://clanker.gitbook.io/documentation/references/core-contracts/v4/mev-modules/clankermevmodule2blockdelay.md).

# ClankerMevModule2BlockDelay

Clanker's fallback mev module, **ClankerMevModuleDelay**, exists when no other mev module is suitable for a chain. The module simply blocks swaps until 2 blocks after deployment.

This delay is to prevent Clanker deployments from causing gas spikes. For example, when Clanker was deployed on v3, searchers caused a spike in the gas price of the network by attempting to search for deployments in the same block (documented [here](https://x.com/0xdoug/status/1861662510023123030)). The solution to this problem was to add a delay between when a pool was deployed and when it is swappable. Our initial MEV module, **ClankerMevModuleDelay**, is used to add a delay between when a pool was deployed and when it is enabled for searching.