> For the complete documentation index, see [llms.txt](https://guide.ston.fi/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://guide.ston.fi/swapping-on-ston.fi/blockchain-and-dex-fees.md).

# Blockchain and DEX fees

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I**n short**:

✅ You always need a bit of GRAM to cover on-chain (network) fees.

✅ We reserve slightly more than the final fee so your transaction won’t fail; unused GRAM is auto-refunded.

✅ Swaps: we reserve up to \~0.35 GRAM; typical actual cost is \~0.06–0.09 GRAM, but can reach \~0.13 GRAM depending on the pool’s fee.

✅ Providing liquidity: we reserve per token (two reservations), usually up to \~0.7–0.8 GRAM total; typical actual cost is \~0.10–0.13 GRAM.

✅ DEX/trading fee (pool fee) is set per pool by its owner. A common setting is 0.30%; typically 0.20% goes to LPs and 0.10% to STON.fi, but the exact split follows the pool’s configured fee.
{% endhint %}

### Why more GRAM is “reserved”

TON network fees aren’t perfectly predictable upfront. To avoid failed transactions:

* We temporarily reserve a bit more GRAM (the “cap”).
* The unused part is sent back to you automatically right after execution.

💡 Think of it like tapping your card at a gas station: a higher hold first, then a final charge for what you actually used.

### Swaps

* Reservation (cap): up to \~0.35 GRAM (can vary by route/pool).
* Typical actual network fee: \~0.06–0.09 GRAM.
* Upper bound in some cases: \~0.13 GRAM.
* What drives it: the pool’s configured trading fee (set by the pool owner) and route complexity.

<figure><img src="https://telegra.ph/file/c26dac3db6bfad5d49cf0.png" alt=""><figcaption><p>Any unused portion of the reservation is refunded.</p></figcaption></figure>

### Providing Liquidity

* Two signatures, two network actions (one per token). Network fees are reserved separately for each token, it makes two reservations in total. Costs refer to adding liquidity; removing liquidity typically incurs slightly lower network fees.
* Total reservation: usually up to \~0.7–0.8 GRAM (both tokens combined).
* Typical actual network fee (total): \~0.10–0.13 GRAM.
* What drives it: pool configuration and whether you’re using balanced vs. arbitrary provision.

<figure><img src="https://telegra.ph/file/aefe34146fdaa41db6ccd.png" alt="As with swaps, unused TON is refunded automatically."><figcaption><p>As with swaps, unused GRAM is refunded automatically.</p></figcaption></figure>

### DEX / Trading Fee (Pool Fee)

* Who sets it: pool owner.
* Common configuration: 0.30% per swap.
* Where it goes: typically \~0.20% to LPs and \~0.10% to STON.fi.
* But: the exact fee and split follow the pool’s current settings.

🔍 You can see the trading fee in the pool details before you swap or add liquidity.

### Practical tips

✅ Keep a small GRAM buffer for fees (even if you mainly hold jettons).

✅ Check the pool’s fee (0.30% is common, but not guaranteed).

✅ Expect a higher reservation on first tries or complex routes; the final spend is usually lower.

✅ If a transaction fails, reserved GRAM is automatically returned — you don’t lose it.

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