The TRAIN Protocol (TRustless Atomic INtents) is a peer-to-peer system for bridging and swapping crypto assets between blockchain networks. The protocol is implemented as a set of persistent, non-upgradable smart contracts deployed to all supported networks.

  • TRAIN is built on top of an improved version of Atomic Swaps. This allows two parties—the User and the Solver—to exchange assets trust-minimizedly across different chains. Users send their Intents to Solvers, who fulfill these Intents using Atomic Swaps.
  • There are no third parties or gatekeepers. The security of the exchange is fully ensured by:
    • The cryptographic protocol (Atomic Swaps)
    • Local verification through a Light Client running in the User’s browser
  • An on-chain Discovery Registry where new Solvers and Networks can permissionlessly register.

Try TRAIN in Action

Experience TRAIN on all major network testnets, including EVM-compatible chains, Starknet, TON, Solana, and Aptos.

Protocol Concepts

Explore the core protocol concepts: Users, Solvers, Auctions, and Atomic Swaps.

Protocol Spec

Dive deeper into the protocol specification and detailed protocol design.