is there api for After rate_save_vote?
Rate relies on the Voting API module, which exposes hook_votingapi_storage_add_vote():


  Save a vote in the database.


function hook_votingapi_storage_add_vote(&amp;$vote) {
  _mongodb_votingapi_prepare_vote($criteria);
  mongodb_collection('votingapi_vote')-&gt;insert($vote);
}


I don't know of a Rate-specific hook but you might get somewhere using that one (all depends what you need to do I guess).