Bat Swarm icon, Legendary rarity item in Grand Piece Online

Bat Swarm BS

Tier B+ Legendary High demand Medium confidence

Current trading value

1.6K

+8.1%7 days

Range 1.4K–1.7K

1,518 Trades

Price history · 60 days

Per-day median across observed trades. Last point is today's solver run.

-66.0% / 60d

Recent Bat Swarm trades

The exact offers our pipeline parsed from Discord. No edits, no opinions.

  • seen 104× Legendary Fruit Chest  Bat Swarm
  • seen 30× Bat Swarm  Legendary Fruit Chest
  • seen 27× 2× Legendary Fruit Chest  Bat Swarm

Most common trade shapes observed for Bat Swarm, from 319 solo-trade samples.

Did you trade Bat Swarm? Log it with in-game Past Trades screenshots

What Bat Swarm's value means

At 1.6K value units, Bat Swarm is worth about 0.16× the 10,000-unit reference the value chart is pegged to (a Mythical Fruit Chest's starting value in the solve).

That figure is a medium-confidence read: the solver places the true value between 1.4K and 1.7K (a ±10% band) off 1,518 observed Discord trades.

Over the last week the value has been softening. The 7-day read sits -41.5% against the 30-day average.

In trade chats and value lists, Bat Swarm is also written BS.

Demand is currently rated High and rarity is Legendary, both recomputed every solver run.

How to get Bat Swarm

Dropped by
Moria, The Shadow King
Location
Thriller Bark
Drop rate
5%
Trade level
475+

Trade recommendations

Auto-built from the value-matches graph. Verdicts use the same win/fair/lose math as the calculator.

FAIR

Bat Swarm for Kaido Gourd (1.7K)

Inside the confidence band. Fair on paper.

-7.7% delta

Flips with Bat Swarm

See all flips →

Trades that read fair to the other player but leave you ahead.

  1. Bat Swarm for Roger's Ace, you gain +19% +19%
  2. Bat Swarm and Mythical Fruit Chest for Head of Ba'al and Mochi and Soul, you gain +21% +21%
  3. Sickle of Sorrow for Bat Swarm and Kikoku and Tori, you gain +18% +18%

FAQ

How much is Bat Swarm worth in GPO?

Bat Swarm's current trading value is approximately 1.6K (range 1.4K-1.7K), based on 1,518 observed Discord trades over the last solver run. Updated 2026-10-26.

How do you get Bat Swarm in GPO?

Source: Moria, The Shadow King. Drop rate: 5%. Location: Thriller Bark.

Is Bat Swarm's value rising or falling?

It's currently softening. The 7-day value sits -41.5% versus the 30-day average. That's the direction the solver sees over the past week.

How is Bat Swarm's value calculated?

Bat Swarm's value is derived purely from observed Discord trade messages using a ratio-chain solver against the Mythical Fruit Chest anchor (10,000 value units). No editor opinions, no hand-tuned numbers. See /legal/methodology for the full math.

Why is the value a range, not one number?

The range is a 90% confidence band. The single headline number is the median. The band shows where the solver thinks the true value lives given noise.