Under Portland’s Open and Accountable Elections program, the candidate is banned from taking any contributions, except up to $250 from an individual or a "small donor organization" that itself is funded by contributions of $250 or less per donor per year.
Also, your contribution also earns for you the Oregon political income tax credit. Whatever you contribute, you get it all back on your 2022 Oregon state income tax return, up to $50 per person or $100 per couple (unless your 2022 "adjusted gross income" is over $75,000 (or over $150,000 for a couple).