PokeIdle
PLAY FREE Bronze Boss Token in PokeIdle: A Trophy, Not a Key
The search asks what it is for. It is for selling or trading. I found no exchange list that turns it into a fixed reward.
Correcting the premise
Players treat the token like a dungeon key because of the word boss. The item text calls it a trophy from an Outland boss on io, and a loot drop on World. You are not spending it to open a door in any public guide I could verify. You are holding a high NPC-value item.
250,000 is the NPC floor. A player can pay more or less. I will not snapshot a market price from one afternoon. Silver and gold tokens are named in conversation and are not given their own pages here, because the searched item is the bronze one. If a future catalog publishes a ratio, this page should gain a row and the updates page should cite it.
Related money questions live on the economy guide. Related hunts live on the hunt table. The token is not a substitute for Rock Stone in an evolution recipe.
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FAQ
What is the NPC price?
250,000 in the io description and in the World loot listing I compared.
Which boss drops it?
The io text says an Outland boss trophy. It does not name the boss or the rate.
How many for a reward?
I have not found a published exchange. Player price is whatever the market pays that day.