What type of receptor is described in the following paragraph?

Sounds like a G protein-coupled receptor, to me.

Receptor Tyrosine Kinases tend to use ATP and they don't bind it, they use it to phosphorylize. Ion channels have an entirely different mode of operation than what's described (involving ions, oddly enough). Intracellular receptors are for later in the chain; they would be those triggered in the "next step".

G protein-coupled receptors, however, do exactly what's described. The receptor binds to the G protein, which activates, binding GTP. The activated G protein then activated other signaling proteins to start a signaling cascade.