> ## Documentation Index
> Fetch the complete documentation index at: https://partner-docs.contro.dev/llms.txt
> Use this file to discover all available pages before exploring further.

# balance.low

> Fired when your balance falls below the alert threshold

## Event: `balance.low`

Sent when your partner balance drops below the configured alert threshold. This check runs daily.

## Payload

```json theme={null}
{
  "balance": 5000,
  "threshold": 10000,
  "currency": "USD"
}
```

| Field | Type | Description |
| - | - | - |
| `balance` | number | Current balance in minor units (cents) |
| `threshold` | number | Alert threshold in minor units (cents). Default: 10000 (\$100) |
| `currency` | string | ISO 4217 currency code |

## Response

Your endpoint must return a **2xx** status code within **30 seconds** to acknowledge receipt. Any non-2xx response or timeout triggers the [retry policy](/partner/webhooks#retry-policy).

| Status code | Meaning |
| - | - |
| `200` | Event received and processed |
| `202` | Event received, will process asynchronously |
| Any non-2xx | Delivery failed — will retry |

## Example handler

```javascript theme={null}
app.post("/webhooks/contro", (req, res) => {
  const eventType = req.headers["x-contro-event"];

  if (eventType === "balance.low") {
    const { balance, threshold, currency } = req.body;
    // Alert your finance team to top up the balance
  }

  res.status(200).send("OK");
});
```