K3 TOS says they must sell no lower than what Moonshot charges. If you have a provider selling for less than $15/mtok, they are violating TOS from Moonshot.
Check out Neuralwatt. They are ZDR and great energy based K3 pricing. They also have a K3-fast which is basically no reasoning (in addition to regular K3).
industry standard is price-per-1M tokens, don't do something different, even Google caved and moved from their char based pricing to tokens (the fundamental unit of computation in ai)
GPUs are rented in $/h, like every other piece of hardware in cloud
https://openrouter.ai/moonshotai/kimi-k3