"Access to the API is not free. The cost to use it depends on volume and intended use. The smallest developer plan, which provides 1,000 API lookups, is a one-time $60 plus $0.08 per additional request. Monthly plans range from $2,000 for 25,000 requests up to $220,000 for 10 million requests." http://news.cnet.com/8301-19...
- François Dongier