> For the complete documentation index, see [llms.txt](https://docs.asterdex.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.asterdex.com/trading/perpetuals/fees-and-specs/self-trade-prevention/how-to-configure-stp.md).
# How to Configure STP
### **Option 1 — Global setting:**
1. Log in and go to the **Perp** trading page
2. Click the **Settings** icon in the top-right corner
3. Under the "Trading" section, find **Self-Trade Prevention** and click to open
4. Select your preferred strategy in the pop-up and click **Confirm**
*Changes take effect immediately after saving. Portions already filled are not affected — the selected STP strategy applies only to the remaining unfilled quantity.*
### **Option 2 — API STP Strategy:**
* Add the `stpMode` parameter to the `POST /fapi/v3/order` endpoint
* API-level settings take priority over the global setting, but only apply to that specific order
### Specifying STP Strategy via API
Use the optional parameter `stpMode` in `POST /fapi/v3/order` to set a strategy for an individual order:
`stpMode: "EXPIRE_MAKER" // Cancel Maker Only stpMode: "EXPIRE_TAKER" // Cancel Taker Only stpMode: "EXPIRE_BOTH" // Cancel Both`
* If omitted, the account's global STP setting (`EXPIRE_MAKER`) is used automatically
* API-specified strategies take priority over the global setting, and apply to that order only
### Example: Cancel Maker Only in Action
A user runs two strategies simultaneously on the BTCUSDT perpetual contract, with STP set to **Cancel Maker Only**.
**Strategy A** places a limit sell order on the order book: sell 0.1 BTC at 69,000 USDT (maker)
**Strategy B** then places a market buy order: buy 0.1 BTC at market — the best available ask happens to be 69,000 USDT (Strategy A's order)
The matching engine detects that both orders belong to the same account and triggers STP:
`Maker sell order (69,000 limit) → Immediately cancelled, status: EXPIRE Taker buy order (market) → Continues execution, matches against the next ask on the book`
The taker order ultimately fills at 69,001 USDT or higher against another seller, and the strategy continues running as intended.
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