One rule, and it has no dial:

toll = size x 3% x (seconds since the bell) / 235,800

235,800 seconds is 65.5 hours: Friday's close to Monday's open, the longest blackout the calendar can produce. A gap that long pays the ceiling; anything shorter pays its share of it; and while New York is open the numerator is zero, so the toll is zero.

The charge is taken on the ETH leg, minted as a claim and donated into the pool inside the same transaction, then the claim is burned. The hook holds no ETH, no tokens and no claim between transactions: there is no pot, no distributor, and nothing anyone can be locked out of.

It is not routed through a whole number of basis points. Going via an integer rate first would round the first quarter of an hour after the bell down to zero, so a trade at 16:05 would pay nothing while the arithmetic insisted it had been charged.