# Triggers

### **Event-Based Trigger**

A trigger event can be passed to advancedUserOperation, in this, a contract address, event signature, and an evaluation statement can be specified.

#### Contract Address

The address of the contract to listen to the events

**Event Signature**

The ABI of the event which you wanna trigger the event on

**Evaluation Statement**

An evaluation statement can be a small mathematical operation, you can use +, -, \*, /, <=, >=, and == to calculate or evaluate something from an event. For example in the below snippet event emits reserve0 and reserve1, for this, we can write an evaluation statement like

```javascript
const evaluationStatement = `:reserve1: / :reserve0: <= ${somerationumber}`;
```

```javascript

{
  ...signedUserOp,
  advancedUserOperation: {
    triggerEvent: {
      contractAddress: "0x123",
      eventSignature: "event Sync(uint112 reserve0, uint112 reserve1);",
      evaluationStatement
    }
  }
}
```

Check full example [here](/use-epoch-sdk/intent-automation-module/examples/schedule-eth-transfer-on-event-trigger.md)

### **Time-Based Trigger**

Transactions can also be sent based on specific time, executionStartWindow and executionEndWindow need to be specified which is compared with the block-time of a chain.

```javascript
{
    ...signedUserOp,
    executionTimeWindow : {
        executionWindowStart: 12341234,
        executionWindowEnd: 12312123
    }
}
```

Check full example [here](/use-epoch-sdk/intent-automation-module/examples/schedule-token-payment.md)

### **Every Block Trigger**

```
Coming Soon...
```

### Off-Chain Webooks Trigger

```
Coming Soon...
```


---

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