Keystone

Deterministic financial computation infrastructure for DeFi and fintech.

What is Keystone?

Keystone provides precision arithmetic and financial calculations that produce identical results across all platforms. Built in Rust with no_std support, it compiles to native code, WebAssembly, and ZK-proving targets.

Key Features

• 128-bit decimal arithmetic with 28 digits of precision
• 7 rounding modes including banker’s rounding (half-even)
• Checked operations that explicitly handle overflow
• Cross-platform determinism verified in CI
• DeFi risk metrics for health factors, liquidation, and position analysis
• Financial calculations for interest, time value of money, and percentages

Crates

Quick Example

#![allow(unused)]
fn main() {
use precision_core::{Decimal, RoundingMode};

let price = Decimal::new(123456, 2);  // 1234.56
let quantity = Decimal::new(15, 1);   // 1.5
let total = price.try_mul(quantity)?; // 1851.84

// Round to cents using banker's rounding
let rounded = total.round(2, RoundingMode::HalfEven);
}

Performance

Operations complete in nanoseconds:

License

Dual-licensed under MIT and Apache 2.0.