> For the complete documentation index, see [llms.txt](https://docs.zkbob.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.zkbob.com/implementation/client-library-sdk/account-less-mode-operations/transaction-constraints.md).
# Transaction Constraints
## Getting Pool Limits
Different privacy pools have different limits for deposit and withdraw operations. Limits can also depend on the user's `0x`-address (address can be whitelisted).
```typescript
async getLimits(address?: string, directRequest: boolean = false): Promise
```
### Parameters
* `address`: An address to be used for evaluating limits. Zero-address is used if undefined.
* `directRequest`: Request limits from the pool contract when `true` (otherwise, request from the relayer node).
### Returns
`Promise` returns [PoolLimits](/implementation/client-library-sdk/common-types.md#pool-limits)
### Example
```typescript
const limits = await zkClient.getLimits('0x0ECD9494F9C1F98C07E5319273C75BEF6232E86D');
console.log(`You can deposit up to ${limits.deposit.total} BOB right now`);
```
## Minimum Transaction Amount
The transaction amount cannot be less than the return value. This is applicable for each transaction type (for multi-transfer tx each note is must meet this minimum value).
```typescript
async minTxAmount(): Promise
```
### Returns
`Promise` returns minimum transaction amount in the pool dimension.
### Example
```typescript
const minTx = await zkClient.minTxAmount();
if (requestedAmount < minTx) {
console.log(`Requested too small amount to transact!`);
}
```
## Maximum Supported Token Swap During Withdraw
Privacy pools have the optional ability to swap an amount of tokens to native coins during a withdraw transaction (typically to seed a wallet with native tokens for operations). The following method returns the maximum number of tokens that can be swapped to native coins.
```typescript
async maxSupportedTokenSwap(): Promise
```
{% hint style="info" %}
The swap is unavailable if `maxSupportedTokenSwap` returns 0
{% endhint %}
### Returns
`Promise` returns maximum number of tokens available to swap to native coins (in the pool dimension).
### Example
```typescript
const maxSwap = await zkClient.maxSupportedTokenSwap();
if (maxSwap > 0n) {
console.log(`Congrats! You can swap tokens to the native coins!`);
}
```
---
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