As of September 2013, we have sold out our entire search capacity and are no longer offering free API usage. Sorry.
Yes. The blekko API allows programs and other websites to run searches on blekko, and to manipulate slashtags. This API is free for low usage rates. Some free users are allowed as many as 1 query per second. Examples of the free users we like include academic research, and services which are free. We also have some specialized APIs for SEO information. These APIs are currently unavailable, while we are launching our paid SEO product on our website. Please contact firstname.lastname@example.org for documentation and an API Auth key.