@Thibault Mouillefarine thanks for your thoughts

As Alex Hormozi said: why not make a kick-ass product yourself using all the leads by yourself and closing yourself? That brings in the most profit. Otherwise, you can go with a hybrid model: charge a lower retainer PLUS pay per lead. many companies in the CPA world do that. If you also have to close for your clients you have to get min. 20% - 40% depending on their product. 3rd option is to prequalify the leads. Send them through a 10-question Typeform funnel or send them to a landbot funnel. In one question you ask them how they are willing to pay. A) monthly retainer B) as described above type in the hybrid model you wish. So that the pure pay-per-call cannot be chosen at all.