You can get ATOM or OSMO tokens on a Centralized Exchange such as Binance or Kraken.
Please follow the process of the platform you choose to register, buy and withdraw your tokens on an Interchain wallet. Please note that creating an account on these exchanges can take a few days.
In cryptocurrency, a direct on-ramp refers to a way to buy cryptocurrency directly with fiat currency (e.g: USD, EURO).
You can create an account on a direct on-ramp, complete any necessary verification processes, and deposit fiat currency using a bank transfer or your credit/debit card.
1) Transak on Osmosis
Osmosis is the main Decentralized Exchange (DEX) of the Interchain that allows you to trade cryptocurrencies and other digital assets in a trustless and permissionless manner.
Osmosis partnership with Transak so you can buy directly $ATOM or $OSMO on their platform.