Metric name: Revived Supply 3+ Years

Chart:

API: https://chainmetrics.com/api/m22_dormant_transfer_3y?apikey=[YOUR-API-KEY-HERE]

Metric description: The total amount of coins that come back into circulation after being untouched for at least 3 years. In other words, it is the total transfer volume of coins that were previously dormant for 3+ years. Total BTC volume of UTXO spent which were created > 3 years ago.