> For the complete documentation index, see [llms.txt](https://docs.gamechat.me/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.gamechat.me/basics/game-chat-v2/game-chat-english/prerequisites-for-using-game-chat.md).

# Prerequisites for using Game Chat

## Service specifications <a href="#undefined" id="undefined"></a>

The SDK provided by Game Chat can be used in the following environments.

| Development environments | Required specifications  |
| ------------------------ | ------------------------ |
| Unity                    | Unity 2018.4.0 or higher |

## Usage Fees

When a project is created, it is set up as a free project, but costs will incur if converted to a paid plan.

<table><thead><tr><th width="125">Type</th><th width="130">Billing Tier</th><th width="143">Billing Criteria</th><th width="75">Fees</th><th width="257">Remarks</th></tr></thead><tbody><tr><td>Free</td><td>200 CCU below</td><td>Day</td><td>Free</td><td>When switching to a paid plan, billing begins. Includes 100GB of network usage.</td></tr><tr><td>Paid Basic Fee</td><td>2,000 CCU above</td><td>Day</td><td>7,333 KRW</td><td>Includes 2TB of network transfer.</td></tr></tbody></table>

* The Game Chat service provides 200 CCU in the free development tier.
* CCU is calculated based on the number of active users simultaneously connected to the chat channel.

## Additional Charges

<table><thead><tr><th width="185">Type</th><th width="176">Billing Tier</th><th width="142">Billing Criteria</th><th width="121">Fess</th><th width="100">Remarks</th></tr></thead><tbody><tr><td>Additional CCU</td><td>Over 2,000 ~ 10,000 below</td><td>CCU</td><td>150 KRW</td><td></td></tr><tr><td>Additional CCU</td><td>Over 10,000</td><td>CCU</td><td>100 KRW</td><td></td></tr><tr><td>Additional Network Usage</td><td>Over 2TB</td><td>GB</td><td>100 KRW</td><td></td></tr></tbody></table>

* If the CCU exceeds the basic tier, additional charges will apply.
* Pricing Example\
  \- A customer using 2,500 CCU from November 1st to November 30th (exceeding by 500 CCU)\
  \- (7,333 KRW \* 30 days) + (500 CCU \* 150 KRW) = 219,990 KRW + 75,000 KRW = 294,990 KRW If


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