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Collateral
This guide shows how to calculate position with giving collateral amount by using the
queryTrade function.Calculate position with giving collateral amount
Example
Get left bound and right bound of position with default leverage and collateral.
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let markPrice = perpetual.markPrice
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let collateral = new BigNumber(3500)
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let leverage = new BigNumber(5)
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let rPos: BigNumber = (collateral.div(markPrice)).times(leverage.plus(1)) // plus 1 to expand upper bound
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let lPos: BigNumber = collateral.div(markPrice)
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Using binary search for position.
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async function searchPos(lPos: BigNumber, rPos: BigNumber, collateral: BigNumber, iteration: number): Promise<string> {
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while (iteration > 0) {
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// l + (r-l)/2 for preventing over flow, instead of (l+r)/2
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let pos = lPos.plus(((rPos.minus(lPos)).div(2)))
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console.log("rPos " + rPos)
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console.log("lPos " + lPos)
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console.log("pos " + pos)
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// 1 leverage
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let res = await liquidityPool.connect(signer).callStatic.queryTrade(0, signer.address, toWei(pos.toString()), NONE, 12800)
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let costBigNumber = new BigNumber(fromWei(res.cost.toString()))
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console.log("costBigNumber " + costBigNumber)
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if (costBigNumber.eq(collateral)) {
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return pos.toString()
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} else if (costBigNumber.gt(collateral)) {
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// means pos too much
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rPos = pos
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} else if (costBigNumber.lt(collateral)) {
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// means pos too small
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lPos = pos
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}
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iteration = iteration - 1
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}
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return lPos.plus(((rPos.minus(lPos)).div(2))).toString()
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}
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Sample Code
Last modified 5mo ago
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