When purchasing bitcoin from Coinbase using an ACH transfer, your purchase amount is limited to the current value of your existing Coinbase holdings.
Because ACH transfers can take a few days to clear, Coinbase places a temporary hold on your assets as collateral and delivers the bitcoin to you right away. Once the ACH transaction settles, the hold is released.
If you want to bypass this limit, you can:
- Use a different payment method (e.g., debit card or wire transfer), or
- Purchase bitcoin directly on Coinbase and transfer it to your Bitkey wallet once the funds are available