PHLX advertise something called FLEX options:
How I read this: if someone w/ a lot of money wants to write their own options chain, they can do so, and trade it over PHLX.
How do I get a list of FLEX options? PHLX lists some ways herE:
but I couldn't get any of the 3 listed sites to work: I either get unrelated quotes or "equity not found" errors.