The hourly wage is visible when the shift is offered on L1NDA Connect. This differs per company, per service. In your placement confirmation you will find how much you will earn per hour for your service once you're hired.
You always work for at least the minimum wage in accordance with the NBBU temporary employment agreement and never for less than what someone within the company in a comparable position with comparable work experience earns. The minimum wage is defined in the document "Wage tables with youth and hourly wages as of January 1, 2020" of Koninklijke Horeca Nederland (2020).