There are two ways you can to contribute to Coin Center. You win credit coins for each contribution, whatever this. You can expense these coins for use an advanced tool, generate additional and advanced lists or estimate...
Second method : by an edition in the catalog :
You can now edit the catalog : add / edit / delete a type, a coin... Each modification gives you an amount a credits. Your edition must be sourced and verifiable, and it will validate by our experts. You can edit since country page and type page.
You must be in country (table, sections or types) page or type page !