/**
* Open Interest Indicators
* Analyze OI trends, divergence, momentum, concentration
*/
/**
* Calculate OI trend
*/
function calculateTrend(oiData) {
const change24h = oiData.change24h;
const momentum = oiData.momentum;
// Determine direction
let direction = 'neutral';
if (change24h > 2) {
direction = 'rising';
}
else if (change24h < -2) {
direction = 'falling';
}
// Strength: absolute change percentage
const strength = Math.min(1, Math.abs(change24h) / 10); // Scale to 0-1 (max 10% change = 1.0)
// Momentum score (normalize to 0-1)
const momentumScore = Math.min(1, Math.abs(momentum) / 100);
return {
direction,
strength: isNaN(strength) ? 0 : strength,
momentum: isNaN(momentumScore) ? 0 : momentumScore
};
}
/**
* Detect OI vs Price divergence
*/
function detectPriceDivergence(oiData, priceChange24h) {
const oiChange = oiData.change24h;
// Bullish divergence: Price down but OI up (accumulation)
// Bearish divergence: Price up but OI down (distribution)
let detected = false;
let type = 'none';
let strength = 0;
if (priceChange24h > 0 && oiChange < -3) {
// Price up, OI down = bearish divergence (weak trend)
detected = true;
type = 'bearish';
strength = Math.min(1, Math.abs(oiChange) / 10);
}
else if (priceChange24h < 0 && oiChange > 3) {
// Price down, OI up = bullish divergence (accumulation)
detected = true;
type = 'bullish';
strength = Math.min(1, Math.abs(oiChange) / 10);
}
return {
detected,
type,
strength: isNaN(strength) ? 0 : strength
};
}
/**
* Detect OI vs Volume divergence
*/
function detectVolumeDivergence(oiData, volumeChange24h) {
const oiChange = oiData.change24h;
// If OI rising but volume falling = institutional accumulation
// If OI falling but volume rising = distribution
let detected = false;
let type = 'none';
let strength = 0;
if (oiChange > 3 && volumeChange24h < -10) {
// OI up, volume down = bullish (institutional)
detected = true;
type = 'bullish';
strength = Math.min(1, Math.abs(oiChange) / 10);
}
else if (oiChange < -3 && volumeChange24h > 10) {
// OI down, volume up = bearish (distribution)
detected = true;
type = 'bearish';
strength = Math.min(1, Math.abs(oiChange) / 10);
}
return {
detected,
type,
strength: isNaN(strength) ? 0 : strength
};
}
/**
* Calculate OI momentum
*/
function calculateMomentum(oiData) {
const momentum = oiData.momentum;
// Momentum score (normalize to 0-1)
const score = Math.min(1, Math.abs(momentum) / 100);
// Breakout: strong momentum change (>50% of average)
const breakout = Math.abs(momentum) > 50;
return {
score: isNaN(score) ? 0 : score,
breakout
};
}
/**
* Calculate OI concentration
*/
function calculateConcentration(oiData) {
const concentration = oiData.concentration;
// Risk level based on concentration
let risk = 'low';
if (concentration > 0.7) {
risk = 'high'; // Highly concentrated = high risk
}
else if (concentration > 0.5) {
risk = 'medium';
}
return {
level: isNaN(concentration) ? 0.5 : Math.max(0, Math.min(1, concentration)),
risk
};
}
/**
* Calculate OI vs Volume correlation
*/
function calculateVolumeCorrelation(oiData, volumeChange24h) {
const oiChange = oiData.change24h;
// Simple correlation: if both moving in same direction = positive
// If moving opposite = negative
let correlation = 0;
if (oiChange !== 0 && volumeChange24h !== 0) {
// Normalize both to same scale
const normalizedOI = oiChange / 10; // Scale to -1 to 1
const normalizedVolume = volumeChange24h / 100; // Scale to -1 to 1
// Calculate correlation sign
if (normalizedOI > 0 && normalizedVolume > 0) {
correlation = Math.min(1, (Math.abs(normalizedOI) + Math.abs(normalizedVolume)) / 2);
}
else if (normalizedOI < 0 && normalizedVolume < 0) {
correlation = Math.min(1, (Math.abs(normalizedOI) + Math.abs(normalizedVolume)) / 2);
}
else {
correlation = -Math.min(1, (Math.abs(normalizedOI) + Math.abs(normalizedVolume)) / 2);
}
}
// Signal: bullish if OI and volume both rising, bearish if both falling
let signal = 'neutral';
if (correlation > 0.3 && oiChange > 0) {
signal = 'bullish';
}
else if (correlation < -0.3 && oiChange < 0) {
signal = 'bearish';
}
return {
vsVolume: isNaN(correlation) ? 0 : Math.max(-1, Math.min(1, correlation)),
signal
};
}
/**
* Calculate open interest indicators
*/
export function calculateOpenInterestIndicators(oiData, priceChange24h, volumeChange24h) {
const trend = calculateTrend(oiData);
const divergence = {
vsPrice: detectPriceDivergence(oiData, priceChange24h || 0),
vsVolume: detectVolumeDivergence(oiData, volumeChange24h || 0)
};
const momentum = calculateMomentum(oiData);
const concentration = calculateConcentration(oiData);
const correlation = calculateVolumeCorrelation(oiData, volumeChange24h || 0);
return {
trend,
divergence,
momentum,
concentration,
correlation
};
}
