# TradingLimitsV2

In **Mento V3**, FPMM pools enforce **per-token net-flow limits** to bound adverse flow over time. The **TradingLimitsV2** library is used by the pool to apply these limits after each swap. (TradingLimits v1 applied to Mento V2; V3 uses TradingLimitsV2.)

***

## Checking limits (code example)

You do not call TradingLimitsV2 directly; the [FPMM](/mento-v3/build/smart-contracts/fpmm.md) applies it after every swap. To **inspect** the current config and state for a token (e.g. for a UI or to debug a reverted swap), use the pool’s view:

```solidity
IFPMM pool = IFPMM(poolAddress);
(address token0, address token1) = pool.tokens();

(
    ITradingLimitsV2.Config memory config,
    ITradingLimitsV2.State memory state
) = pool.getTradingLimits(token0);  // or token1

// config.limit0, config.limit1 => caps (e.g. 5-min and 1-day)
// state.netflow0, state.netflow1 => current net flow in the windows
// If a swap would push netflow over the limit, the swap reverts
```

***

## Behavior

* **L0** — Short-term limit over a **5-minute** rolling window: net flow of the token in that window must stay within the configured bounds (e.g. `-limit0 <= netflow0 <= limit0`).
* **L1** — Medium-term limit over a **1-day** rolling window: net flow over the day must stay within the configured bounds.

Each pool token can have its own config (limit0, limit1). If a swap would cause either limit to be exceeded, the swap reverts. Limits are applied after the swap amounts are determined; fee is deducted from inflow before updating net flow.

This protects the pool and the protocol from large one-sided flow in a short period (e.g. oracle lag or manipulation) while still allowing normal trading.

**Contract:** [mento-protocol/mento-core](https://github.com/mento-protocol/mento-core) — `contracts/libraries/TradingLimitsV2.sol`

For how TradingLimitsV2 is configured and used on a pool, see [TradingLimitsV2](/mento-v3/dive-deeper/fpmm/trading-limits.md) in Dive Deeper.


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://docs.mento.org/mento-v3/build/smart-contracts/tradinglimits.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.