Seeking Guidance on Recruitment Commission

I’ve been working as a recruiter primarily on a commission basis. Recently, I’ve successfully established connections that have led my agency to strike an agreement with a new employer in another country, which is projected to generate over £100k in revenue in the coming year.

The employer acknowledged my role in facilitating this connection and asked if I had a figure in mind regarding fair compensation for my efforts.

I’m unsure about what might be standard in this situation. Could anyone provide insight into what percentage is typical? For example, would 2%, 5%, or even 10% of the anticipated contract value be reasonable?

While my involvement in the discussions was limited, my initial connections were vital for making this opportunity possible.

Thank you for your help!