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

# IB20Asset.effectiveAt

> Returns the timestamp at which the pending UI multiplier becomes effective.

## Signature

```solidity IB20Asset.sol theme={null}
function effectiveAt() external view returns (uint256);
```

| Field               | Value           |
| ------------------- | --------------- |
| Selector            | `0x97a4064f`    |
| Canonical signature | `effectiveAt()` |

## Description

Returns the `block.timestamp` at which the pending UI multiplier becomes active.

A live pending update exists while `effectiveAt() > block.timestamp`. Once `block.timestamp >= effectiveAt()`, `uiMultiplier()` returns the new multiplier automatically, no transaction is required and no event is emitted at maturation.

After the flip, check for a new live pending update with `effectiveAt() > block.timestamp`. Do not check `effectiveAt() == 0`.

| State                    | Return value                                                                                       |
| ------------------------ | -------------------------------------------------------------------------------------------------- |
| No pending update        | `0`                                                                                                |
| Pending update scheduled | Future timestamp set by `updateUIMultiplier`                                                       |
| Pending update matured   | The scheduled timestamp, now in the past. Only `cancelUIMultiplierUpdate` resets the value to `0`. |

<Note>
  Maturation is time-based. Indexers must not wait for an onchain event at `effectiveAt`. The `UIMultiplierUpdated` event fires when the update is **recorded**, not when it matures.
</Note>