# Fees & Incentives

## Trading Fees

Strike uses a **uniform fee model** with a **50/50 buyer–seller split**:

| Parameter         | Rate             | Description                                           |
| ----------------- | ---------------- | ----------------------------------------------------- |
| **Total fee**     | 20 bps (0.20%)   | Split equally between buyer and seller                |
| **Buy-side fee**  | `floor(fee / 2)` | Deducted from buyer's filled collateral at settlement |
| **Sell-side fee** | `ceil(fee / 2)`  | Deducted from seller's USDT payout at settlement      |

* No maker/taker distinction — both sides pay half the fee
* The extra wei from integer rounding goes to the protocol (sell side pays `ceil`)
* Fees are deducted during atomic batch settlement (inline with clearing)
* All fees go to the `protocolFeeCollector` address
* `clearingBountyBps` exists (admin-configurable) but is currently set to 0

## Protocol Revenue

All trading fees flow to the protocol fee collector address. This funds development and operations.

## Resolver Bounty

Markets can be resolved permissionlessly by anyone with valid Pyth data. The resolver bounty mechanism is configurable via FeeModel but currently set to 0.

## Anti-Spam / DoS Prevention

| Mechanism                     | Purpose                                                                              |
| ----------------------------- | ------------------------------------------------------------------------------------ |
| **Minimum lot size**          | Prevents dust orders (MIN\_LOTS = 1, i.e. $0.01)                                     |
| **Full collateral locking**   | Economic cost to placing orders (USDT locked until fill or cancel)                   |
| **ERC-20 approval required**  | Users must approve Vault before placing orders                                       |
| **Per-user active order cap** | MAX\_USER\_ORDERS = 20 per market — prevents a single address from flooding the book |

The per-user order cap is tracked via an `activeOrderCount` mapping and enforced on `placeOrder`, `placeOrders`, and `replaceOrders`. Orders freed by cancellation or settlement decrement the counter.

## Cost Estimates (BSC at 0.05 gwei)

| Action               | Est. Gas | Est. Cost |
| -------------------- | -------- | --------- |
| Approve Vault (once) | \~46k    | \~$0.001  |
| Place order          | \~250k   | \~$0.008  |
| Cancel order         | \~100k   | \~$0.003  |
| Clear batch (atomic) | \~2.0M   | \~$0.063  |
| Resolve market       | \~300k   | \~$0.009  |

*Based on BNB ≈ $628. Settlement is included in clearBatch — no separate claim transaction needed.*


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