> For the complete documentation index, see [llms.txt](https://docs.variational.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.variational.io/omni/listing-engine.md).

# Listing Engine

On Omni, new perps markets are permissionlessly listed, which means that they are automatically listed once they fulfill certain criteria. These criteria include reliable price feeds, activity requirements, decentralization requirements, security checks, and more.

Markets may be delisted if they fail to sustain the requirements. A delisting means all positions will be closed at the settlement price. The settlement price is an exponentially weighted moving average of the instrument price at the time of the delisting.