# invest

This entrypoint is designed to add liquidity to a specific DEX pool.

This method includes a balanced and imbalanced ways of investing.

### Call parameters

<table><thead><tr><th width="158">Field</th><th width="240" align="center">Type</th><th width="448.2">Description</th></tr></thead><tbody><tr><td>pool_id</td><td align="center"><code>nat</code></td><td>pool identifier</td></tr><tr><td>shares</td><td align="center"><code>nat</code></td><td>the minimal amount of shares to receive</td></tr><tr><td>in_amounts</td><td align="center"><code>map(token_pool_idx_t, nat)</code></td><td>map of token amounts to be invested</td></tr><tr><td>deadline</td><td align="center"><code>timestamp</code></td><td>dealine of current operation</td></tr><tr><td>receiver</td><td align="center"><code>option(address)</code></td><td>optional, address of the receiver of the LP tokens. If not provided the <code>sender</code> address will be used.</td></tr><tr><td>referral</td><td align="center"><code>option(address)</code></td><td>optional, address of the referral of the current operation. If not provided the <code>default_referral</code> address will be used.</td></tr></tbody></table>

```pascaligo
type invest_param_t     is [@layout:comb] record [
  pool_id                 : nat; 
  shares                  : nat; 
  in_amounts              : map(token_pool_idx_t, nat); 
  deadline                : timestamp; 
  receiver                : option(address); 
  referral                : option(address);
]
```


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