Reactor Developer Documentation

Reactor is a secure, low-cost, and developer-friendly messaging protocol enabling seamless communication across Web2 and Web3 systems. Built on the Internet Computer (IC), Reactor supports cross-chain messaging, Web2 integrations, automation, and randomness — all through a unified interface.

Reactor empowers developers to build cross-environment applications without the high cost and increased complexity of traditional blockchain integration tools.

Key Features

100% Onchain - Messages stay onchain providing end to end security and transparency.
Level 5 Cross-Chain Security - Risk management provides enhanced defense-in-depth strategies.
Cross-Chain Messaging — Interact between blockchains with one interface.
Web2 ↔ Web3 Integration — Push and pull data across web and blockchain based applications.
Automation — Schedule or event-triggered message execution.
Random Number Generation — On-demand randomness for games, lotteries, etc.
Consistent Pricing — Zero node operator incentives allow for low per message pricing on almost all chains.
Scalable Infrastructure — Cloud-level performance to connect blockchains and existing systems together.

Use Cases

Cross-Chain Loyalty

Verify NFT ownership across chains to issue access passes or rewards.

Token Snapshot + Storage

Query token balances and save to AWS S3 for accounting/compliance.

Hybrid Apps

Build applications that span onchain logic and traditional infrastructure (cloud and on-prem).

Webhooks to Smart Contracts

Push events from Web2 systems (like Stripe or Twilio) to smart contracts.

Decentralized Gaming

Use Reactor’s RNG and automation to enable game logic without centralized servers.

Architecture

Reactor Core

Deployed on the Internet Computer (IC), the Core performs:

HTTP requests to Web2 services
Cross-Chain message routing
Scheduled tasks
Random number generation

Reactor Gateway

Smart contracts on supported blockchains:

Sends messages to Core
Receives responses from Core
Forwards requested data to the specified smart contracts

Reactor Fee Manager

Smart contracts on supported blockchains:

Manages fee configurations for destination chains
Maintains the set of available payment tokens on a chain
Calculates the fee for a message

Reactor Sentinel

Provides risk management through analysis and auditing of messages flowing through Reactor:

Inspects all messages to determine risk profile
Apply additional custom logic on messages
Mitigate security attacks and other adverse actions