How is the algorithm of applications like spywords.ru, keys.so arranged?

Question

contextual advertising

It is interesting to learn how applications work under the hood that allow you to analyze advertising campaigns of other sites.

Answer 1

They go to their base.
Just like moab, bukvariks and other keyword bases, only these have ad bases.

Answer 2

Already discussed on Toaster.
These services have a large database of keywords for which they parse the advertising results of search engines. Accordingly, they collect a database of advertisers for each of these questions with queries and keywords. Then, based on these data, they try to analyze budgets, frequency and other parameters, based on the tools of advertising systems.
The system is absolutely not perfect. Currently, campaigns use a huge number of different adjustments, additional targeting. Campaigns can use broader queries, it can only work on certain days, hours or certain regions. Half of the budget or more may also go to YAN / KMS. Thus, you will never estimate the advertiser's budget. The maximum for which these services can be used is for new ideas on the semantic core or some kind of analysis of directions, competitive advantages.