/**
 * Funding rate normalization.
 *
 * Exchange funding rate periods:
 * - Hyperliquid: per 1 HOUR (settles every 1h)
 * - Pacifica: per 1 HOUR (settles every 1h)
 * - Lighter: per 8 HOURS (API returns 8h rate, settles every 1h)
 *
 * HIP-3 deployed dexes on Hyperliquid use 8h funding periods.
 *
 * To compare rates across exchanges, we normalize everything to
 * a per-hour basis, then annualize from there.
 */
/**
 * Get funding period in hours for an exchange.
 * HIP-3 deployed dexes (not in the map) default to 1h (API returns hourly).
 * HL and PAC are 1h, Lighter API returns 8h rates.
 */
export declare function getFundingHours(exchange: string): number;
/** Convert a raw funding rate to per-hour rate */
export declare function toHourlyRate(rate: number, exchange: string): number;
/** Annualize a raw rate from a specific exchange */
export declare function annualizeRate(rate: number, exchange: string): number;
/** Annualize an already-normalized hourly rate (no exchange conversion needed) */
export declare function annualizeHourlyRate(hourlyRate: number): number;
/**
 * Compute annualized spread between two exchange rates.
 * Normalizes both to hourly before comparing.
 */
export declare function computeAnnualSpread(rateA: number, exchangeA: string, rateB: number, exchangeB: string): number;
/**
 * Compute SIGNED annualized spread for an existing arb position.
 * Positive = favorable (short receiving more than long paying).
 * Negative = unfavorable (funding flipped, position losing on funding).
 *
 * For spot-perp: pass longRate=0, longExchange=shortExchange (spot has no funding).
 */
export declare function computeSignedAnnualSpread(shortRate: number, shortExchange: string, longRate: number, longExchange: string): number;
/**
 * Estimate hourly funding payment for a position.
 * @param rate - raw funding rate from the exchange
 * @param exchange - exchange name
 * @param positionUsd - position notional in USD
 * @param side - "long" or "short" (longs pay positive rate, shorts receive)
 * @returns hourly payment in USD (positive = you pay, negative = you receive)
 */
export declare function estimateHourlyFunding(rate: number, exchange: string, positionUsd: number, side: "long" | "short"): number;