Reactive Network Integrates Arbitrum

Dave Mcleod

— 2 min read
Reactive Network Integrates Arbitrum

Bringing Event-Driven Automation to the Heart of L2 DeFi & DeFAI

Reactive Network is excited to announce native support for Arbitrum One, Ethereum’s flagship Layer-2 roll-up. Starting today, developers can deploy Reactive Smart Contracts (RSCs) on Arbitrum One and link them—permissionlessly—to any other Reactive-enabled chain through Hyperlane’s general message-passing layer. The result: ultra-low-fee, event-driven automation for DeFi, Gaming, DePin and the emerging DeFAI (DeFi + AI) stack.

Why Arbitrum?

  • Nitro performance & low fees – Arbitrum One’s Nitro stack compresses calldata and executes transactions off-chain, delivering faster execution and significantly cheaper gas than L1 while inheriting Ethereum security.
  • DeFi liquidity magnet – Arbitrum One surpassed $20 B in TVL earlier this year, making it the largest venue for Ethereum-based DeFi activity.
  • Full EVM equivalence plus Stylus – Developers can keep writing Solidity or switch to Rust/C/C++ via Stylus’ WASM VM, gaining major performance wins without losing composability.

These traits make Arbitrum One the ideal home for on-chain, always-on automations that react to market conditions in real time.

What Reactive Brings to Arbitrum One

  • Cross-chain triggers - RSCs on Arbitrum One can listen to events on any Reactive-enabled network and respond atomically—no off-chain servers or bridges required.
  • Universal gas token - Execution fees are paid in $REACT, eliminating the need to juggle ETH or other native tokens across chains.
  • Milliseconds-to-minutes reactivity - Use on-chain price oracles, liquidation feeds, or AI inference outputs to trigger trades, rebalance vaults, or update risk parameters—instantly.
  • Composable with Stylus - WASM contracts written in Rust can call—or be called by—RSCs, paving the way for high-performance DeFAI agents on Arbitrum One.

DeFi & DeFAI Use-Case Snapshots

  1. Event Triggered Stop OrdersSell assets automatically triggered by on-chain events on Arbitrum, or any supported chain. 
  2. AI-Driven Delta-Neutral VaultsTrain an off-chain ML model, stream inference scores on-chain, and let an RSC shift liquidity between Perp DEXes and lending markets to stay market-neutral—24/7.
  3. Gas-Free Cross-Roll-Up ArbitrageWhen price gaps emerge between Arbitrum One and another chain, an RSC automatically arbitrages the spread, paying all execution costs in $REACT.
  4. Automated Risk Off-RampIf oracle feeds report unusual volatility, an RSC can migrate LP positions from high-risk pools to stable vaults in a single transaction—no keeper network required.

Get Started Today

  • Deploy now: dev.reactive.network for quick-start with boiler-plate RSCs and use-case concepts.
  • Grants: A dedicated DeFAI on Arbitrum track is live within the $3 M Reactive Developer Fund.
  • Support: Join our developer community for office hours and code reviews.

About Reactive Network

Reactive Network—pioneered by PARSIQ—introduces Reactive Smart Contracts, an inversion-of-control programming model that lets contracts react autonomously to events on any chain. With Hyperlane-powered interoperability and $REACT as a universal gas token, Reactive is the simplest way to build truly cross-chain, event-driven dApps.

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