You can check whether an agency holds the IDEA quality mark in several ways. 1) Ask directly: serious agencies state it on their website. 2) Check the IDEA website (idea.nl) and the members list. 3) Ask to see the certificate: real holders have a physical certificate. 4) Check the financial protection: IDEA agencies work with third-party client accounts. 5) Check the dispute scheme and ask for the written escalation protocol. If an agency makes no IDEA claim, ask why not. Many companies aren't IDEA members because of the administrative work, but serious agencies choose it deliberately. If an agency claims the IDEA mark but you can't find them in the members list, that's a red flag. Live Impact works IDEA-compliantly and transparently.