> For the complete documentation index, see [llms.txt](https://support.backpack.exchange/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://support.backpack.exchange/exchange/trading/trading-bots/spot-grid.md).

# Spot Grid

### **Why two assets are required**

A spot grid requires both:

* **Quote asset** (e.g., USDC) → for buy orders
* **Base asset** (e.g., BTC) → for sell orders

Orders are pre-calculated based on:

* Price range
* Grid count
* Total investment

### **What is a Deficit?**

A deficit is the missing base asset required to place all sell orders.

**Example:**

* Grid: BTC/USDC, range $90–$110
* Current price: $100
* Required BTC for sell orders: 0.5 BTC
* Available: 0.2 BTC

→ Deficit = **0.3 BTC**

**Deficit Status**

* **Deficit = 0** → No action needed
* **Deficit > 0** → You must choose a funding method

### **Funding Options: Borrow Mode vs Buy Mode**

|              | Borrow Mode       | Buy Mode                  |
| ------------ | ----------------- | ------------------------- |
| How it works | Borrow base asset | Buy base asset using USDC |
| Upfront cost | None              | Reduces USDC immediately  |
| Ongoing cost | Interest accrues  | None                      |

{% hint style="info" %}
**Note:**\
Buy Mode uses M`ax Entry Price` to cap purchase price (default ≈ 1% above current price).
{% endhint %}

**Auto Selection Logic**

The system selects the funding mode automatically:

* Enough base asset → No funding
* Only one mode available → Uses that mode
* Both available → Defaults to **Borrow Mode** (can switch manually)


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