> For the complete documentation index, see [llms.txt](https://mixfun.gitbook.io/mixfun/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://mixfun.gitbook.io/mixfun/concepts/relayers.md).

# Relayers

> A MixFun service that submits your withdrawal transaction so your receiving wallet can stay unfunded.

The MixFun relayer takes your withdrawal proof and submits it on-chain as its own signed transaction. Your receiving wallet does not need any SOL. In exchange, the relayer keeps a small share of the withdrawn amount.

Relayers solve the "first transaction" problem. Funding a fresh wallet from your main wallet defeats the point of using MixFun, because the funding creates a public link. The relayer breaks that link by being the one that funds the withdrawal.

## What the relayer can and cannot do

The relayer can:

* Submit your withdrawal transaction on Solana.
* Pay the transaction's gas.
* Quote its fee before you confirm.

The relayer cannot:

* Change the recipient. The target address is baked into the proof; altering it invalidates the proof.
* Steal your funds.
* Reverse the withdrawal. Solana transactions are final.
* Link your withdrawal to your deposit.
* Learn your main wallet. The proof arrives from your browser over HTTPS with no identifying information attached.

## Where the relayer applies

The relayer is exposed in the app as a "Use relayer" toggle on:

* **Private Send withdrawals.**
* **Shielded Pools withdrawals.** Token and Token2022 handled automatically.

## How relayer fees work

The relayer quotes a fee before you submit. The fee covers Solana gas and a service share that keeps the relayer running. The quote is expressed as a portion of the withdrawn amount, and the app shows the exact receive amount before you confirm. If the fee is high for your situation, withdraw directly.

See [Use the relayer](/mixfun/guides/use-the-relayer.md) for the operational flow.


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