European call and put options priced on-chain via Black-Scholes, volatility sourced from a four-chain realized vol index computed by Reactive Network.
Adjust the inputs to see how the premium changes in real time — this exact math runs in Solidity on every swap.
Every premium update is a deterministic on-chain computation — no off-chain services, no oracles you can't audit.
Unichain for ultra-cheap execution. Reactive Network for cross-chain automation — no bots, no cron jobs, no off-chain relayers.
Optimism-based L2 built by Uniswap Labs. Home of the Uniswap V4 PoolManager and the hook ecosystem. Sub-cent gas fees make on-chain option pricing economical for the first time.
A blockchain that watches other blockchains. Reactive Smart Contracts subscribe to events and automatically fire transactions — like GitHub Actions but for on-chain state.
Designed from first principles for on-chain European options — no compromises on pricing accuracy or settlement reliability.
Realized volatility aggregated from Ethereum (35%), Arbitrum (30%), Base (20%), and BSC (15%). Manipulation-resistant by design.
Full B-S formula in Solidity using WAD fixed-point arithmetic. Delta, gamma, theta, and vega computed on every option purchase — no approximations.
USDC liquidity providers underwrite all option series. Premiums are distributed proportionally. 17.3% estimated APY from current premium rates.
When an option series expires, Reactive Network's ExpirySettler RSC detects the expiry timestamp on-chain and automatically calls settleExpiredSeries(seriesId, spotPrice) on Unichain — no keeper bots to fund, no manual intervention required. ITM holders can then claim their payout trustlessly.
OptionsHook intercepts swaps via beforeSwap and beforeSwapReturnDelta. No separate contracts — options live natively inside the pool.
Each option series mints standard ERC-20 tokens. Fully composable — transfer, wrap, use as collateral in other DeFi protocols.
Every design decision was made with verifiability in mind. 112 passing tests, no upgradeable proxies, no admin keys on core logic.
Full coverage across BlackScholes, CollateralVault, OptionsHook, OptionSeries, and VolatilityOracle. Fuzz tests included.
VolatilityOracle reverts on stale data. If Reactive Network stops updating, pricing halts rather than using bad vol.
ITM holders claim payout individually — no iteration over unbounded holder arrays, no gas DoS risk.
Business Source License — educational use permitted, commercial use requires written consent. Converts to MIT on 2030-01-01.
Realized volatility computed from Uniswap V3 ETH/USDC 0.05% pools — the deepest, most liquid ETH markets on each network.
Same Black-Scholes formula — but Voltaire uses real cross-chain vol, not an inflated implied vol set by market makers. Every number below is computed live.
| Feature | Traditional | Voltaire |
|---|---|---|
| Vol source | Implied vol — opaque, set by market makers | Realized vol — 1,152 samples/day across 4 chains |
| Settlement | Keeper bot — can fail, requires funding | Reactive Network cron — automatic, zero bots |
| Manipulation risk | Single chain — flash loan attackable | 4 chains simultaneously — practically impossible |
| Counterparty | Exchange team / protocol | Smart contract only — fully trustless |
| Uniswap version | Not applicable | V4 hook (product) + V3 data source (vol oracle) |
Uniswap V3 is used as the volatility data source (deeper liquidity, 3+ years battle-tested, available on all 4 chains). Uniswap V4 is the product layer — the hook intercepts swaps to mint options on Unichain.
Buy put options as portfolio insurance. Cap your downside without selling ETH. Pay a small premium, protect against a 30–50% crash.
Leverage ETH exposure without full capital. A call option at ~5% of ETH's price gives equivalent upside. Max loss = premium paid.
Deposit USDC into CollateralVault. Earn premiums from every option sold. 17.3% APY demonstrated — far above lending rates.
Hedge ETH treasury exposure. Buy puts without trusting a custodian. Cheaper than OTC, fully transparent, on-chain accounting.
Fully on-chain, no API keys or broker accounts. An agent can hedge or speculate programmatically with zero human dependency.
Deployed on Unichain Sepolia testnet. Connect MetaMask and go.