I would like to personally thank you for choosing to support RankTank.
If you purchased a RankTank Basic API key, this allows you to scan a single custom domain, 100 keywords with no Google locale or query limits.
RankTank Pro users will receive a special key that is not tied to a single domain.
You will need to purchase a key for each domain to be scanned unless you upgraded to RankTank Pro.
– Jaco & Snozzle