via 538, https://projects.fivethirtyeight.com/biden-approval-rating/

This market will resolve YES, if at any point in 2023, Biden's Approval Rating will be below 37.5

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This market will resolve to the bold line as indicated at the 538 chart. In case of a tie, detailed data to calculate averages will be used to resolve.

Please note, there is a second very similar market that uses 37.6% as the line.

And here is the market for 2024: