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

# v4 Deployments

Clanker v4 tokens charge an LP fee on trades, support optional extensions and use an MEV module to protect the launch. For Clanker v5, see [Token Deployments](https://docs.clanker.world/general/token-deployments).

## How a v4 token works

![token deployment](https://mintcdn.com/clanker/k1xnbfSXDAksfmGR/assets/token-deployment.png?fit=max\&auto=format\&n=k1xnbfSXDAksfmGR\&q=85\&s=a0d3b2b381043ee894f36ee5d0fcd25e)

The details below describe Clanker v4.0. v4 tokens deployed from the clanker.world form before v5 use v4.1, which replaces the sniper auction with a sniper tax (see [Sniper auction](#sniper-auction)).

### Supply

* Each token is an ERC-20 with a total supply of 100 billion tokens.
* Tokens can't be minted after deployment, so the supply is fixed at 100 billion.
* Holders can burn tokens with the `burn()` function on the token contract.

### Extensions

Up to 90% of the total supply can go to Clanker extensions, which use tokens for something other than pool liquidity:

* **Vault**: lock and vest tokens for a set period (7-day minimum lockup).
* **Creator buy (dev buy)**: spend ETH to buy tokens in the deployment transaction, so the creator makes the first purchase from the pool.
* **Airdrop**: send tokens to a list of recipients, who claim them after a set lockup and vesting period (1-day minimum lockup).

### Liquidity

The remaining tokens (up to 100% of the supply if no extensions are used) are split across up to 7 liquidity positions in a Uniswap v4 pool.

### Sniper auction

A v4.0 token opens with a short auction before normal trading starts. The auction captures value from MEV bots (trading bots that try to profit from new launches) and sends part of it back to the token's creator.

* Normal trading starts after 5 auction rounds (about 22 seconds after deployment), or right after a round with no bidders.
* Normal trading starts by block *n+11* at the latest.
* For details, see [ClankerSniperAuctionV0](https://docs.clanker.world/references/core-contracts/v4/mev-modules/clankersniperauctionv0.md).

v4 tokens deployed from the clanker.world form use a sniper tax instead, which falls over the first seconds of trading. See [ClankerMevDescendingFees](https://docs.clanker.world/references/core-contracts/v4/mev-modules/clankermevdescendingfees.md).

## Deploy a v4 token

New launches on clanker.world, the API and the bots are v5. Existing v4 tokens keep working and are managed from their Admin page.

## Related

* [Creator Rewards & Fees](https://docs.clanker.world/general/creator-rewards-and-fees.md)
* [Managing a Token](https://docs.clanker.world/general/managing-a-token.md)
* [Deployed Contracts](https://docs.clanker.world/references/deployed-contracts.md)


This documentation is built and hosted on [Mintlify](https://mintlify.com), a developer documentation platform.