What is Paradigm?

The Paradigm protocol is a relay protocol for smart contract-based financial primitives. The OrderStream is a decentralized, event-based, and super-peer network with proof-of-stake based sybil tolerance with access control managed by an Ethereum contract system.

The OrderStream network provides a venue for order message broadcast and price discovery for any type of Ethereum-based financial primitive that meets the following criteria. They must 1) allow arbitrary "off-chain" methods for broadcast and discovery of signed, executable order messages, and 2) implement some type of settlement or execution "on-chain", where the transfer of assets and validation of balances takes place via protocol-independent Ethereum contracts.

In other words, Paradigm is building the global liquidity network for decentralized finance.

Click here for a complete technical introduction to the Paradigm protocol.

Use cases

Developers, applications, and businesses can leverage the core protocol (contract system and OrderStream network) for a variety of use cases, finance-related or otherwise.

  • Derive and serve an order book from the OrderStream
  • Tap into on-demand liquidity from anywhere in the world, without restriction
  • Build a "matcher" – an exchange build atop the decentralized OrderStream liquidity network
  • Trade fully client-side with an OrderStream node, and an Ethereum client
  • Use the OrderStream as infrastructure and an API to run an open order book relayer
  • Experiment with the OrderStream event-based API for new types of decentralized applications
  • ...

Core protocol

The core protocol is implemented as an event-driven, proof-of-stake based relay network, supported by a system of Ethereum contracts. The network itself is currently built on Tendermint.

  • ParadigmCore (source code here)
    • Network client for full nodes and validators that make up the OrderStream network
    • Consensus takes place around a lightweight transactional state machine, for access control and governance
    • Facilitates and enables message relay functionality for applications and broadcast nodes
    • Functions with internal ParadigmContracts as the protocol's reference implementation
    • Byzantine fault tolerant and performant, thanks to Tendermint Core
  • ParadigmContracts (source code here)
    • Core protocol smart-contract system implemented in solidity
    • Responsible for sybil tolerance and network write access control
    • Includes native token system and voting logic for validator election/removal

Developer tools

Paradigm Labs is also leading development of a variety of developer tools to enable rapid development on top of the Paradigm protocol and settlement platform. A non-exhaustive list is below.

  • ParadigmConnect (source code here)
    • Primary library for interacting with the Paradigm protocol
    • Includes tools for making, signing, and posting orders
    • Allows execution/settlement of trades as a taker
    • Enables "listening" to the OrderStream event API to build order books
  • SubContractSDK (source code here)
    • SubContracts are settlement logic on the Paradigm platform
    • The SubContract interface and OrderGateway contract create a highly extensible and open settlement platform for decentralized exchange logic
    • They can wrap existing settlement logic, or implement new types
    • Highly flexible and extensible settlement interface for any contract type


Paradigm Labs is committed to developing the Paradigm protocol as open-source software. Connect with the team and the community to share ideas, give feedback, and ask for help.

Last Updated: 1/31/2019, 4:42:36 PM