# Fungibility Provider

**The primary role of FP (Fungibility Provider) is to facilitate BTC redemptions that cannot be directly handled by Operators.**

Here's why:

* Operators can only process withdrawals within specific amount ranges.
* When a user's redemption request falls outside these limits, **FPs advance the BTC payment to the user immediately**.
* Later, when FPs accumulate enough small withdrawals to form a processable batch, **they reclaim the BTC through Operators**.

<figure><img src="https://2784505184-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FNaWxhWAPbrPeq8rIwJHB%2Fuploads%2FzpYTbqBTRFuwG7qK4GAj%2Fwhiteboard_exported_image%20(19).png?alt=media&#x26;token=1bc6e1d9-b820-4822-ad41-1d074f332fac" alt="" width="563"><figcaption></figcaption></figure>

After FPs advance BTC to users, they must redeem the BTC themselves. In this scenario, **FPs assume the same role as bridge users**, following identical trust assumptions during redemption. (Refer to the [*User*](https://app.gitbook.com/o/pCAnNlKAzOo8rYFBd4MY/s/NaWxhWAPbrPeq8rIwJHB/~/changes/71/our-product-suite/pragmatically-trustless-bitvm-bitcoin-bridge/security-analysis/users) section for details.)

**Note:** Users are required to pay an additional service fee to FPs for this convenience.


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