Will one be on Coinbase?

One Get Coin is one of them. It’s not available on the Coinbase app or Coinbase Wallet.

Harmony (ONE) tokens can be purchased on most big exchanges, such as:

How to buy Harmony ONE: A step-by-step guide

Harmony is not supported by Coinbase .

Harmony has announced the Mainnet Release v4. 3.4, which will introduce mandatory updates with a hard fork. The Harmony network will be upgraded at block 22872064 on 11 February 2022.