They make it pretty easy to do this – here’s a screenshot:
1) Pick your coin
2) Pick your Payment Method
3) Put in your USD amount (it will auto convert to your coin)
4) Click the “Repeat this buy” box
5) Select Weekly
You’re going to select “Recurring Transaction” and select “Weekly.” This means that Coinbase will automatically buy up the crypto you want each week automatically and withdraw the funds from your account.
Note: you will see different coin prices depending on the price on the day you purchase. Coinbase or any exchange will buy the market price each week so the amount of coin you buy each week will vary as well.
Disclaimer: this is not investment advice. Please do your own research.