I wish there were a way for recipients to define a message routing and format conversion protocol, incentivized by money. e.g., you can call me at night for $5

I wish there were a way for recipients to define a message routing and format conversion protocol, incentivized by money. e.g., you can call me at night for $5k. You can call me during "phone hour" for $100. You an call at other times for $250. If your call turns out to be worth my time, I don't bill you; if it was a waste of my time (spam, pointless, etc.), I'll charge up to 100% of that amount. Senders would get to see a menu of costs for various technologies, and would get to see how I handle them (various guarantees). They may vary based on sender, topic, etc. e.g. I'd be willing to take YC applicant advice emails during a few weeks of the year for 10% of normal price, with a guaranteed response within 12h. I'd charge a lot less for email than for phone, etc. Part of this would be some kind of ecash system, and the other part would be format conversion; being able to turn phone calls into text messages, read back to the user to verify.