Definition. Spent Output Price Distribution (SOPD), Percent-Partitioned, is a histogram of the day's spent BTC volume bucketed by the price at which each spent output was originally acquired. Each bar reports the amount of BTC volume that moved within the bucket, where the x-axis price refers to the lower bound of that bucket.

Technical. The percent-partitioned variant defines buckets by taking the day's closing price and creating 50 equally spaced buckets above and 50 below it, each ±2% wide. Originally developed for UTXO-based blockchains, this version generalizes the concept to account-based chains as well.

Notes. For more information, see Introducing Account-Based Metrics and our articles on entity-adjustment and account-based metrics here and here.