An all-time low, or ATL, is the lowest recorded price of an asset within the trading history being examined. It is the opposite of an all-time high. A new ATL replaces the earlier record when a lower valid price is observed.
History and quote currency matter
A yearly low is not necessarily an ATL: older trading may contain lower prices. Likewise, a low quoted in US dollars may differ from a low against Bitcoin. Records based on individual trades, daily closes or aggregated prices can also differ.
Early private sale prices are not automatically comparable with public market trades. Limited historical coverage, unusual transactions and token unit changes can affect what a data service reports. The source and measurement basis should therefore accompany a precise ATL claim.
A record is not a floor
A token that falls from USD 1 to a new low of USD 0.20 can still fall to USD 0.10, another 50% loss. This hypothetical example excludes trading costs.
An ATL alone does not establish whether a project is failing, an asset is undervalued or a rebound will occur. The circumstances behind the decline and available trading liquidity remain separate questions.