# Buying at the Best Price with Maximum Price and Balance Constraints

Buying at the best price with a cap on maximum buy price and current counter token balance

```json
{
"gap": "0.005",
"execute_price": "min(orderbook().bid[0].price+symbol().price_precision,max_bid_price)*(1+gap*(order_pos+1))",
"max_bid_price": "orderbook().ask[0].price-symbol().price_precision",
"execute_volume": "10/execute_price+abs(order_pos)*10/execute_price",
"buy_orders_count": "5 if balance('counter').total > 5000 else 0",
"sell_orders_count": "0"
}
```

The grid places buy orders at the best available price. An additional parameter, gap, is used in calculating the order prices. In this example, gap is set to 0.5%.

<mark style="color:red;">`1+gap*(`</mark>[<mark style="color:blue;">`order_pos`</mark>](https://docs.origami.tech/function/pre-defined-parameters/order-pos)<mark style="color:red;">`-1)`</mark>

<mark style="color:red;">`max_bid_price`</mark>parameter in this case is defined as:

<mark style="color:red;">`orderbook().ask[0].price-symbol().price_precision`</mark>

which sets the maximum buy price to one price\_precision below the best ask price. Alternatively, a specific numerical value can be used to set the limit.

The [<mark style="color:blue;">`execute_volume`</mark>](https://docs.origami.tech/function/required-parameters/execute-volume) parameter determines the base token amount, equivalent to 20 counter tokens for the first order, with an increment of 10 counter tokens for each subsequent order. The formula used is:&#x20;

<mark style="color:red;">`10/`</mark>[<mark style="color:blue;">`execute_price`</mark>](https://docs.origami.tech/function/required-parameters/execute-price)<mark style="color:red;">`+`</mark>[<mark style="color:blue;">`abs`</mark>](https://docs.origami.tech/function/functions/abs)<mark style="color:red;">`(`</mark>[<mark style="color:blue;">`order_pos`</mark>](https://docs.origami.tech/function/pre-defined-parameters/order-pos)<mark style="color:red;">`)*10/`</mark>[<mark style="color:blue;">`execute_price`</mark>](https://docs.origami.tech/function/required-parameters/execute-price)

Orders will continue to be placed until the balance of the <mark style="color:red;">`counter`</mark> token drops below 5000.

If needed, this limitation can be replaced with the aggregated balance across multiple exchanges [<mark style="color:blue;">`group_balance`</mark>](https://docs.origami.tech/function/functions/group-balance)<mark style="color:red;">`('counter').current.total`</mark>

<mark style="color:red;">`5 if`</mark> [<mark style="color:blue;">`group_balance`</mark>](https://docs.origami.tech/function/functions/group-balance)<mark style="color:red;">`('counter').current.total > 5000 else 0`</mark>

&#x20;or with the balance of the base token, defined as: [<mark style="color:blue;">`balance`</mark>](https://docs.origami.tech/function/functions/balance)<mark style="color:red;">`('base').total`</mark>

<mark style="color:red;">`5 if`</mark> [<mark style="color:blue;">`balance`</mark>](https://docs.origami.tech/function/functions/balance)<mark style="color:red;">`('base').total < 5000 else 0`</mark>