> ## Documentation Index > Fetch the complete documentation index at: https://docs.gains.trade/llms.txt > Use this file to discover all available pages before exploring further. # Trading Contracts > How to interact with Gains trading contracts. To interact with trading contracts, call the relevant methods on the `GNSMultiCollatDiamond` contract. Each facet method can be accessed through this central contract. Network-specific `GNSMultiCollatDiamond` addresses are listed on the [Active Contracts page](/what-is-gains-network/contract-addresses#active-contracts). ## Addresses For the latest addresses, see [Contract Addresses](/what-is-gains-network/contract-addresses#active-contracts). If you are using testnet, the [Arbitrum Sepolia address](https://louper.dev/diamond/0xd659a15812064C79E189fd950A189b15c75d3186?network=arbitrumSepolia) for `GNSMultiCollatDiamond` is `0xd659a15812064C79E189fd950A189b15c75d3186`. ## Interactions Below is a list of available actions, consisting of market & limit orders, as well as updates. Where possible, NatSpec documentation is linked to. For full reference, see the [ITradingInteractionsUtils](/developer/technical-reference/contracts/interfaces/libraries/itradinginteractionsutils) natspec. * Place a trade\* * Place a limit order * Update a trade * Update a limit order * Cancel a limit order * Close a trade\* * Update leverage (decrease/increase) * Increase position size * Decrease position size \**Requires order fulfillment. Integrators make requests, and oracles fulfill them.* ### Place a Trade Place a trade using the following functions. Use tradeType = 0. [`openTrade`](/developer/technical-reference/contracts/interfaces/libraries/itradinginteractionsutils#opentrade) [`openTradeNative`](/developer/technical-reference/contracts/interfaces/libraries/itradinginteractionsutils#opentradenative) If an order hasn't been fulfilled in 60 seconds, collateral can be claimed back using the timeout function: [`cancelOrderAfterTimeout`](/developer/technical-reference/contracts/interfaces/libraries/itradinginteractionsutils#cancelorderaftertimeout) ### Place a Limit Order Same as market order, but provided tradeType of 1 or 2. \ **Limit**: To be used when you want to go long at a lower price than present, or to go short if the price reaches a higher price than present. Executes at exact price set if price reaches threshold + spread. **Stop:** To be used when you want to go long if the price reaches a higher price than present, or to go short if the price reaches a lower price than present. You might want to use this to long a breakout, or short a breakdown. The execution price is the current market price + spread. ### Update Active Trade Supports updating take profit (TP) and stop loss (SL). [`updateSl`](/developer/technical-reference/contracts/interfaces/libraries/itradinginteractionsutils#updatesl) [`updateTp`](/developer/technical-reference/contracts/interfaces/libraries/itradinginteractionsutils#updatetp) ### Update Pending Limit Order If a limit order hasn't been fulfilled yet, it can be updated [`updateOpenOrder`](/developer/technical-reference/contracts/interfaces/libraries/itradinginteractionsutils#updateopenorder) ### Cancel Pending Limit Order If a limit order hasn't been fulfilled yet, it can be canceled [`cancelOpenOrder`](/developer/technical-reference/contracts/interfaces/libraries/itradinginteractionsutils#cancelopenorder) ### Close a Trade Market close a trade [`closeTradeMarket`](/developer/technical-reference/contracts/interfaces/libraries/itradinginteractionsutils#closetrademarket) If the trade hasn't been closed in 60 seconds, a timeout may be initiated, allowing for another close attempt: [`cancelOrderAfterTimeout`](/developer/technical-reference/contracts/interfaces/libraries/itradinginteractionsutils#cancelorderaftertimeout) ### Update Leverage Update leverage for a trade [`updateLeverage`](/developer/technical-reference/contracts/interfaces/libraries/itradinginteractionsutils#updateleverage) ### Update Position Size Decrease position size (by decreasing collateral amount or leverage) [`decreasePositionSize`](/developer/technical-reference/contracts/interfaces/libraries/itradinginteractionsutils#decreasepositionsize) Increase position size (by increasing collateral amount or leverage or both) [`increasePositionSize`](/developer/technical-reference/contracts/interfaces/libraries/itradinginteractionsutils#increasepositionsize) ## Events Events are emitted to allow off-chain services to stay updated. You can subscribe to these directly, or review the [Backend](/developer/integrators/backend) page for instructions on receiving events from a WebSocket stream. We recommend using the backend. **Core Events** For opening or closing a trade: `MarketOrderInitiated` -> `MarketExecuted` For placing a limit order: `OpenOrderPlaced` For updating a trade: `TradeSlUpdated` or `TradeTpUpdated` For fulfilling a limit order (SL, TP, Open limit): `LimitExecuted` For updating leverage: `LeverageUpdateInitiated`-> `LeverageUpdateExecuted` For updating position size (increase): `PositionSizeUpdateInitiated`-> `PositionSizeIncreaseExecuted` For updating position size (decrease): `PositionSizeUpdateInitiated`-> `PositionSizeDeccreaseExecuted` **All Lifecycle Events** [`MarketOrderInitiated`](/developer/technical-reference/contracts/interfaces/libraries/itradinginteractionsutils#marketorderinitiated) [`TriggerOrderInitiated`](/developer/technical-reference/contracts/interfaces/libraries/itradinginteractionsutils#triggerorderinitiated) [`OpenLimitUpdated`](/developer/technical-reference/contracts/interfaces/libraries/itradinginteractionsutils#openlimitupdated) [`OpenLimitCanceled`](/developer/technical-reference/contracts/interfaces/libraries/itradinginteractionsutils#openlimitcanceled) [`ChainlinkCallbackTimeout`](/developer/technical-reference/contracts/interfaces/libraries/itradinginteractionsutils#chainlinkcallbacktimeout) [`OpenOrderPlaced`](/developer/technical-reference/contracts/interfaces/libraries/itradinginteractionsutils#openorderplaced) [`TradeSlUpdated`](/developer/technical-reference/contracts/interfaces/libraries/itradingstorageutils#tradeslupdated) [`TradeTpUpdated`](/developer/technical-reference/contracts/interfaces/libraries/itradingstorageutils#tradetpupdated) [`MarketExecuted`](/developer/technical-reference/contracts/interfaces/libraries/itradingcallbacksutils#marketexecuted) [`LimitExecuted`](/developer/technical-reference/contracts/interfaces/libraries/itradingcallbacksutils#limitexecuted) [`LeverageUpdateInitiated`](/developer/technical-reference/contracts/interfaces/libraries/iupdateleverageutils#leverageupdateinitiated) [`PositionSizeUpdateInitiated`](/developer/technical-reference/contracts/interfaces/libraries/iupdatepositionsizeutils#positionsizeupdateinitiated) [`LeverageUpdateExecuted`](/developer/technical-reference/contracts/interfaces/libraries/iupdateleverageutils#leverageupdateexecuted) [`PositionSizeDecreaseExecuted`](/developer/technical-reference/contracts/interfaces/libraries/iupdatepositionsizeutils#positionsizedecreaseexecuted) [`PositionSizeIncreaseExecuted`](/developer/technical-reference/contracts/interfaces/libraries/iupdatepositionsizeutils#positionsizeincreaseexecuted)