Looks like Google doesn’t want everyone to use their free tools. Google Keyword Tools are the best ones out there to start researching any kind of keywords. Most of the market pretty much rely on this Keyword Tool’s API to get their data for their keyword difficulty scores and stuff.
Here’s an easiest way to skip providing billing information in adwords.
  1. Signup for your new AdWords account, like you normally would
  2. Verify your email
  3. When it asks for enter billing information -> click here
  4. This should have taken you straight to your account and have skipped the whole “enter your billing details” process.
┬áThis might be a temporary workaround, but has been working since it was ever restricted – which is why it’s just a work-around until we have a permanent way to bypass it.