Primary sources
Provider websites and publicly accessible console pages.
Product pricing, region, operating system and network documentation.
Provider public APIs, status pages and inventory pages.
Provider-submitted information reviewed by a person.
Sources not used alone
Search snippets, forums, reviews and third-party promotions may provide leads, but are not used as formal pricing evidence without official or multiple-source verification.
Source labels
Plan records should show a source link, original currency, billing period and last checked time. A broken source moves the record into review.