My standard freelance rate is $50 per hour. Estimates are available if your project is planned: if not, I apply the same hourly rate to project planning.
All costs are subject to negotiation and a written agreement that works for both of us. That agreement will include a scope of work.
Once we agree to payment, I will honor that agreement.
All payment, including piece-rates and price-caps, circle around my usual hourly rate, which is a rate of $50 (standard), $65 to $75 (complex content). I may work on a piece rate or apply a price-cap, for regular clients. This practice helps you keep your budget predictable.