TradingKeep is a fan-made player-to-player marketplace — not affiliated with or endorsed by Grand Piece Online or its publisher. Game and item names and images belong to their respective owners.
As of July 2026, the community value of a Mythical Chest in Grand Piece Online is about 4,000 — a reference point from player trading, not a price.
Values updated July 2026.
Value
Check a trade →Community reference value · a sanity-check, not a price.
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Frequently asked
What is a Mythical Chest worth in Grand Piece Online?
As of July 2026, a Mythical Chest has a community value of about 4,000 in Grand Piece Online. These are reference points from player trading — not official prices.
What can I trade a Mythical Chest for?
List your Mythical Chest on TradingKeep and browse Win / Fair / Lose offers from other players. Every trade is done in-game, item-for-item — never pay first.
How are Grand Piece Online values decided?
Grand Piece Online values are community consensus reference points, updated regularly based on rarity, demand and recent trades — they reflect what players actually trade, not an official price.