# add\_pool

This entrypoint allows anyone to deploy a new own DEX pool.

{% hint style="info" %}
QUIPU token should be approved (updated operators) before calling this method.
{% endhint %}

### Call parameters

Parameters logically close to Standalone variant of [add-new-dex](https://docs.quipuswap.com/smart-contracts/quipuswap-stable-swap-dex/standalone-dex/add-new-dex "mention"), but there is no "`reserves`" field in tokens\_info mapping (because invest performs at second step - [start\_dex](https://docs.quipuswap.com/smart-contracts/quipuswap-stable-swap-dex/factory/initialize-new-dex-flow/start_dex "mention")) and some additional config parameters.

* `default_referral` - the address that would be the default referral at the new pool.
* `managers` - a set of addresses that allowed to manipulate LP token metadata at the new pool.
* `metadata` - metadata of deployed contract.
* `token_metadata`  - metadata of the LP token at the new pool.

<table><thead><tr><th width="188">Field</th><th width="247" align="center">Type</th><th width="448.2">Description</th></tr></thead><tbody><tr><td>a_constant</td><td align="center"><code>nat</code></td><td>constant "A" as represented as <span class="math">A*n^{n-1}</span>.</td></tr><tr><td>input_tokens</td><td align="center"><code>set(token_t)</code></td><td>sorted set of <code>FA2/FA1.2</code> tokens to add as DEX.</td></tr><tr><td>tokens_info</td><td align="center"><code>map(token_pool_idx_t,token_prec_info_t)</code></td><td>map of rates and precisions config</td></tr><tr><td>default_referral</td><td align="center"><code>address</code></td><td>default referral that will be used in operations with the referral.</td></tr><tr><td>managers</td><td align="center"><code>set(address)</code></td><td>set of managers that allowed to change LP token metadata.</td></tr><tr><td>metadata</td><td align="center"><code>big_map(string, bytes)</code></td><td>contract metadata by <a href="https://gitlab.com/tezos/tzip/-/blob/master/proposals/tzip-16/tzip-16.md">TZIP-016</a></td></tr><tr><td>token_metadata</td><td align="center"><code>big_map(token_id_t, token_meta_info_t)</code></td><td>mapping each token metadata by <a href="https://gitlab.com/tezos/tzip/-/blob/master/proposals/tzip-12/tzip-12.md">TZIP-012</a></td></tr></tbody></table>

```pascaligo
type token_prec_info_t  is [@layout:comb] record [
  rate                    : nat;
  precision_multiplier    : nat;
]

type pool_init_param_t  is [@layout:comb] record [
  a_constant              : nat;
  input_tokens            : set(token_t);
  tokens_info             : map(token_pool_idx_t, token_prec_info_t);
  default_referral        : address;
  managers                : set(address);
  metadata                : big_map(string, bytes);
  token_metadata          : big_map(token_id_t, token_meta_info_t);
]
```