Our email to Google Adwords support regarding the 250,000 free quota points offered right after API account registration. Later on, after the billing information had been submitted, offer for free API quota points was suddenly removed.
From the email:
I understand you are inquiring about the review criteria for API free quota points. At this time we’re unable to disclose details about how registration information is reviewed for free API quota points. Thank you for your understanding.
To help you better understand the quota to operations system and usage
rate fees, I have listed some key concepts below.
WHAT IS AN OPERATION?
An operation is defined as an action taken upon your AdWords account. For
example, requesting the status of a single Ad Group would be considered
one operation. Updating the individual bids on 1,000 keywords would equate
to 1,000 operations.
QUOTA TO OPERATIONS USAGE
Like the exchange of money for goods and services, quota units can be
exchanged for operations. The AdWords API system assigns different quota
unit values to different types of operations. While some types of
operations may consume just one quota unit, others may consume more. For a
full breakdown of these assigned values, please view our rate sheet at:
API QUOTA USAGE FEES
As of November 1, 2006, the AdWords API is moving from a quota allocation
system to a fee based system for usage. Although some advertisers may
still be eligible for a limited amount of free quota, rate for API quota
usage is Ł0.25 per 1000 quota units consumed.