gmx

Create a MarketIncrease order by batching sendWnt (collateral plus execution fee) and createOrder into a single multicall on the ExchangeRouter. Leverage is implicit: it equals sizeDeltaUsd divided by collateral value, with no separate leverage parameter.

Use OrderType.MarketSwap (enum value 0) with sizeDeltaUsd set to zero and a swapPath containing the market token. Batch sendWnt for the execution fee, sendTokens for the input token, and createOrder into one multicall transaction.

GMX orders are asynchronous: keepers execute them in a separate transaction using Chainlink Data Streams prices. Common causes are insufficient execution fee, keeper backlog during volatility, or the price moving past your acceptablePrice causing auto-cancellation.

GMX uses 30-decimal precision for all USD values like sizeDeltaUsd and triggerPrice. A $5000 position is 5000 * 10^30, not 10^18. Using 18 decimals creates positions orders of magnitude off and triggers leverage errors.

Approve ERC-20 tokens to the Router contract (0x7452c558d45f8afC8c83dAe62C3f8A5BE19c71f6 on Arbitrum), not the ExchangeRouter. The ExchangeRouter calls the Router internally to transfer tokens, so approving the ExchangeRouter directly does nothing.

GMX V2 is deployed on Arbitrum (chain ID 42161) and Avalanche (chain ID 43114). Avalanche has fewer markets and different contract addresses, so always verify addresses against the official docs before integrating.