That’s why we advise you to proceed as follows;
Select a small number of design agencies that appeal to you. Talk to these different entities about your product, market, challenges. Listen to them and find out whether they may provide you with new insights and a true added value. Ask them how they dealt with other projects, what their challenges were and how they tackled them. Talk to the people who will be working on your project. Is there a spark? Do you feel they offer an added value? Ask how, as an agency, they would go about your project on a strategic (not a creative) level and what it would cost to execute it.
Always share the project budget. In our experience, clients keep their budgets to themselves to hide that in fact they have none. This only leads to disillusionment, time loss and additional costs. We believe in transparancy that goes both ways.
Hoping for your understanding and a better world we salute you,