You would need to buy from registrars that have an API with atleast 200+ registrars a minute API cap. ResellerClub for example is one, but caps at about 50 a minute.

Than it would just be a matter of using the pre-existing API and build onto it to suit multiple requests.. You would also need to do a few things to guarentee or increase the speed of the script..

You would also need to edit the php.ini and increase timeout of script.

- Steve