What is real-time PnL calculation in perpetual futures?

It's updating profit/loss on every price tick using precise math — crucial for liqs and funding in high-use trading.

Why use rust_decimal instead of f64 for PnL?

f64 rounds subtly, compounding to huge losses at scale (e.g., $1k/hour at 10k ticks/sec). Decimal keeps it exact.

Absolutely — fork it, add your matching logic from Part 1, deploy on a chain. Open-source gold for perp DEXes.

Imagine $1,000 vanishing in an hour from floating-point glitches. This Rust PnL engine laughs that off with Decimal precision.

theAIcatchup Apr 10, 2026 4 min read

Rust's rust_decimal crate eliminates f64 rounding errors, preventing $1k+ hourly ghost losses at 10k ticks/sec. 𝕏
Real-time PnL drives liquidations, funding, and risk checks — the heartbeat of any perpetual engine. 𝕏
Open-source perps like this could slash CEX fees, echoing spot trading's 2014 revolution. 𝕏

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Community-driven. Code-first.

#crypto-trading-engine #real-time-pnl #rust-perpetual-engine #rust_decimal

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Originally reported by Dev.to