# stop\_ramp\_A

{% hint style="warning" %}
This entrypoint should be called only by `admin` address.
{% endhint %}

This entrypoint is designed to stop ramping the "A" constant, when ramping in progress.

The new value of "A" fixed at time when stop is called. 

Call param type is `nat` - pool identifier.

### How to set `A` constant?

`A` constant set to contract in precalculated invariant value as

$$A\_{storage} = A \* n^{n-1}$$

so, if you want to set `A` correctly you should keep it in mind.

### Parameters

<table><thead><tr><th width="150">Field</th><th width="190" align="center">Type</th><th width="448.2">Description</th></tr></thead><tbody><tr><td>-</td><td align="center"><code>pool_id_t</code></td><td>pool identifier.</td></tr></tbody></table>