{
"$schema": "https://json-schema.org/draft/2020-12/schema",
"title": "PositionChange",
"description": "One leg of the position change log: a trade, liquidation, auto-deleverage, or settlement that changed (or touched) a position, with the position before and after. Hyperliquid legs carry `direction`, `closed_pnl`, `crossed`, and `seq`; Lighter legs carry `realized_pnl`, `is_maker`, and the Lighter fields at the end.",
"type": "object",
"required": [
"cause",
"coin",
"continuity",
"end_position",
"entry_price_after",
"event_type",
"fee",
"fee_token",
"finalized",
"opened_at",
"order_id",
"price",
"side",
"size",
"start_position",
"symbol",
"timestamp",
"trade_id"
],
"properties": {
"account_index": {
"description": "Lighter only: account index as a string.",
"type": "string",
"example": "513030"
},
"account_kind": {
"description": "Lighter only: `user`, `insurance`, `settlement`, or `system`.",
"type": "string",
"example": "user"
},
"block_number": {
"description": "Hyperliquid and HIP-3 only, present when known (from September 17, 2026): block that executed the leg.",
"type": "integer",
"format": "int64",
"example": 745512345
},
"cause": {
"description": "Why the leg happened: `trade`, `liquidation`, `liquidation_counterparty`, `adl`, `settlement`, or `unknown`.",
"type": "string",
"example": "trade"
},
"closed_pnl": {
"description": "Hyperliquid and HIP-3 only: realized PnL of the leg in USD.",
"type": "string",
"nullable": true,
"example": "19.9"
},
"coin": {
"description": "Alias of `symbol`.",
"type": "string",
"example": "BTC"
},
"continuity": {
"description": "`ok` when `start_position` continues the previous leg exactly, `inferred` when it was bridged, `first_seen` for the first leg recorded for the account and market, `quarantined` when the chain is broken and the leg is held out of position state.",
"type": "string",
"enum": [
"ok",
"inferred",
"first_seen",
"quarantined"
],
"example": "ok"
},
"crossed": {
"description": "Hyperliquid and HIP-3 only: true when this account was the taker.",
"type": "boolean",
"example": true
},
"dex": {
"description": "HIP-3 only: dex of the market.",
"type": "string",
"example": "xyz"
},
"direction": {
"description": "Hyperliquid and HIP-3 only: direction label as reported by Hyperliquid (for example `Close Short`).",
"type": "string",
"example": "Close Short"
},
"end_position": {
"description": "Signed position size after the leg.",
"type": "string",
"nullable": true,
"example": "-0.25"
},
"entry_price_after": {
"description": "Average entry price after the leg. Null when the position is flat after it.",
"type": "string",
"nullable": true,
"example": "64210.5"
},
"event_index": {
"description": "Hyperliquid and HIP-3 only, present with `block_number`: execution order within the block.",
"type": "integer",
"example": 12
},
"event_type": {
"description": "Effect on the position: `open`, `increase`, `reduce`, `close`, or `flip`. Lighter also reports `settlement` (the settlement counterparty side of a market settlement) and `unchanged`.",
"type": "string",
"example": "reduce"
},
"fee": {
"description": "Fee paid for the leg (negative is a rebate).",
"type": "string",
"nullable": true,
"example": "0.4875"
},
"fee_rate": {
"description": "Lighter only: fee rate as a decimal ratio.",
"type": "string",
"nullable": true,
"example": "0.00002"
},
"fee_token": {
"description": "Asset the fee is paid in: USDC on Hyperliquid and Lighter mainnet, USDG on Lighter on Robinhood Chain.",
"type": "string",
"example": "USDC"
},
"fee_usdc": {
"description": "Lighter only: fee in the quote asset, computed from the notional and the fee rate.",
"type": "string",
"nullable": true,
"example": "0.325"
},
"finalized": {
"description": "True when the leg is final and will not be re-derived.",
"type": "boolean",
"example": true
},
"is_maker": {
"description": "Lighter only: true when this account was the maker.",
"type": "boolean",
"example": false
},
"opened_at": {
"description": "Start of the position lifecycle this leg belongs to. Null when it opened before coverage.",
"type": "string",
"format": "date-time",
"nullable": true
},
"order_id": {
"description": "Order ID of this account.",
"type": "integer",
"format": "int64",
"nullable": true,
"example": 844421856609148
},
"position_size_after": {
"description": "Lighter only: alias of `end_position`.",
"type": "string",
"example": "-0.25"
},
"position_size_before": {
"description": "Lighter only: alias of `start_position`.",
"type": "string",
"example": "-0.5"
},
"price": {
"description": "Execution price.",
"type": "string",
"nullable": true,
"example": "65010.2"
},
"realized_pnl": {
"description": "Lighter only: realized PnL of the leg in the quote asset (0 on open and increase).",
"type": "string",
"example": "19.9"
},
"seq": {
"description": "Hyperliquid and HIP-3 only: order of legs that share a timestamp.",
"type": "integer",
"example": 0
},
"side": {
"description": "Side of this account in the trade, exactly as on the trades routes: `B` (buy) or `A` (sell).",
"type": "string",
"enum": [
"B",
"A"
],
"example": "B"
},
"size": {
"description": "Traded size in base units.",
"type": "string",
"nullable": true,
"example": "0.25"
},
"start_position": {
"description": "Signed position size before the leg.",
"type": "string",
"nullable": true,
"example": "-0.5"
},
"symbol": {
"description": "Market symbol (HIP-3: `dex:COIN`).",
"type": "string",
"example": "BTC"
},
"timestamp": {
"description": "Execution time (UTC).",
"type": "string",
"format": "date-time",
"example": "2026-09-25T14:03:11.482Z"
},
"trade_id": {
"description": "Trade ID, shared by both legs of a trade.",
"type": "integer",
"format": "int64",
"example": 26121110211
},
"usdc_amount": {
"description": "Lighter only: notional of the leg in the quote asset.",
"type": "string",
"example": "16252.55"
}
}
}
