It is possible to verify a journal's compliance with Open Access requirements using the Journal Checker Tool, a tool created by Plan_S. Once an article has passed peer review, it is essential to always check the publishers' policies regarding the deposit of the Post Print (or Accepted) version in institutional or disciplinary repositories (e.g., ArXiv, Zenodo, etc.). The Green Open Access route should always be considered as a dissemination option for your work while retaining copyright.

Link: https://journalcheckertool.org/