Answer:
Die without me, never thank me. Walk right through me, never feel me. Always watching, never speaking. Always lurking, never seen.
My first is a creature whose breeding is unclear. My second, a price you must pay. My whole can be found in the river of Time and refers to events of today.
Iron roof, glass walls, burns and burns and never falls.
What measures out time until in time all is smashed to it?
Round as a button, deep as a well. If you want me to talk, you must first pull my tail.
They are many and one, they wave and they drum, Used to cover a state, they go with you everywhere.