Why do you still find American host families and au pairs who wish to work in the USA on AuPairWorld? Well, the same principle applies to the USA as to any other host country. This means that au pairs and host families may take the opportunity to pre-search their future contracting partner through our site: as a first step, host families and au pairs may select their match according to their individual search criteria (prematching). Once the choice has been made, both au pair and host family need to decide upon the designated agency they wish to select. The agency takes care of the formalities for the J1-visa au pairs need to apply for. Au pairs and host families pay for the services provided by these agencies.