> ## Documentation Index > Fetch the complete documentation index at: https://docs.fade.finance/llms.txt > Use this file to discover all available pages before exploring further. # Swap win-back > A ticket in the same transaction as the swap. Start with the fees. ## What the user sees > **Swap complete. This trade was free.** > 4.20 SOL → 622.44 USDC, fees on us. Or, at a smaller scale: "Your swap fees are on us." ## Atomic with the swap `open_wager` can sit in the same transaction as the swap. Fade only restricts what may sit next to a liquidity provider's deposit or withdrawal request, never what sits next to `open_wager`. The swap and the ticket therefore land together or not at all. Two slots later the randomness can be requested, ORAO answers in a few seconds, and the settlement pays a win. The platform or a keeper sends those two steps, so the user signs once. ## Start with the fees Paying back a whole 600 USDC trade is a liability the pool can only carry once it is large. Paying back the trade's **fees** is a small liability per trade at a very high frequency, which is the shape a pool serves best. **Fees on us, 1 trade in 20.** A trade pays 2.50 USDC of fees. The platform stakes 0.1296 USDC from its fee revenue on a paytable that pays 2.50 USDC or nothing, at a 3.5 % declared edge: | | Value | | - | - | | Multiplier | `m = 192 902` bps, 19.29× | | Probability | `p = 50 025 401`, about 1 in 20 | | Payout if won | 2.50 USDC to the user | | Liability | 2.37 USDC | | Pool that carries it, idle | from about 160 USDC of assets | A stake this small fits devnet's 0.10 USDC minimum. Under the protocol's reference minimum for the direct path (7.5 USDC), fee win-backs either bundle several trades' fees into one ticket or take the [shared beacon](/protocol/shared-beacon) design built for small stakes. **The whole trade, 1 trade in 100.** Paying back the 622.44 USDC of the trade above at 1 in 100 needs a stake of about 6.45 USDC and reserves about 616 USDC of liability. That fits an idle pool from about 41 000 USDC. "1 trade in 100 is fee-free" fits a young pool; "1 trade in 100 is free" waits for a larger one. ## Who funds the stake The platform, out of its fee revenue: a promotion, and the variant to lead with. A user paying a surcharge for the chance is staking their own money, which is a wager with the legal consequences described on [Checkout win-back](/use-cases/checkout-win-back). ## Farming A user could split one swap into many to multiply their chances. Keep the rule economic: the promotion's expected cost per trade must stay below the fees that trade pays. Splitting then costs the user more in fees than it wins on average. ## Who integrates * DEX aggregators and wallets with a swap screen. * Launchpads and mint platforms ("this mint might be free"). * Liquid staking and vaults, on deposits ("your deposit fee is on us"). ## How it is wired | Account | Platform-funded fees | | - | - | | `integratorAuthority` | The platform's key or program PDA | | `payer` | The platform | | `stakeOwner`, `stakeSource` | The platform's fee account, which signs | | `beneficiary` | The user's USDC account | The devnet demo at [app.fade.finance/#swap](https://app.fade.finance/#swap) simulates the swap leg at an indicative price; the payout that may pay the trade back is real (test USDC). Prize-linked payouts are subject to local gaming and promotion law. A platform-funded promotion is generally treated differently from a user paying for a chance. Check each market. This documentation is built and hosted on [Mintlify](https://mintlify.com), a developer documentation platform.