# Overview & Event

Fortisx webhooks deliver **real‑time alert events** to your server via HTTP `POST`.

* **Single subscription** per account. Re‑installing the webhook **overwrites** the previous one.
* Subscription is configured via API (**see API Reference → Webhooks**). This page does not duplicate endpoints.

## What you receive

```
POST {your-callback-url}
Content-Type: application/json
X-Fortisx-Event-Id: evt_01HXYZA12B
X-Fortisx-Signature: t=1730548800, v1=<hex-hmac>
```

* `X-Fortisx-Event-Id` — unique ID for idempotency.
* `X-Fortisx-Signature` — request signature (see “Signature Verification” for details).

> Delivery policy (2xx ≤ 5s, retries, idempotency): see [**Signature Verification**](https://fortisx.gitbook.io/docs/signature#delivery--retries).

***

## Event example (`alert.created`)

```json
{
  "id": "evt_01HXYZA12B",
  "type": "alert.created",
  "occurredAt": "2025-11-02T12:40:00Z",
  "data": {
    "id": 1119,
    "networkCode": "SOL",
    "stakingPoolId": 82,
    "eventType": "TVL_Spike",
    "windowMinutes": 60,
    "valueFrom": "5200000.000000000000000000",
    "valueTo": "6050000.000000000000000000",
    "unit": "USD",
    "tokenSymbol": "SOL",
    "deltaAbs": "850000.000000000000000000",
    "deltaRelPct": "16.346154",
    "detectedAt": "2025-11-02 12:40:00"
  }
}
```