The Ellipsis codebase is based on code from Curve Finance; their audits can be found here.
Peckshield has completed an audit of the Ellipsis 2.0 contracts; this was delivered on March 28th, 2022. No critical issues were found; all flagged issues have been resolved. The audit report is public and has been published here.
We thank the Peckshield team for auditing Ellipsis.