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17 March 2021
Live since
KYC required
Maximum bounty

Program Overview

OmniBridge is an interoperability solution for Ethereum Virtual Machine (EVM) chains, which allows users to move ERC-20 tokens between networks quickly and efficiently.

OmniBridge, developed by the xDai STAKE team, is interested in securing its smart contracts against double spending, Denial of Service attacks, or anything that results in loss of user funds.


Verification of xDai STAKE's bug bounty program on Immunefi is available at

See verification

Rewards by Threat Level

Rewards are distributed according to the impact of the vulnerability based on the Immunefi Vulnerability Severity Classification System. This is a simplified 5-level scale, with separate scales for websites/apps and smart contracts/blockchains, encompassing everything from consequence of exploitation to privilege required to likelihood of a successful exploit.

Payouts are handled by xDai team directly and are denominated in USD. However, payouts are done in USDT. Payouts above USDT $100,000 are completed in STAKE.

Smart Contracts and Blockchain

from USDT $100,000 up to STAKE $2,000,000
up to USDT $10,000
up to USD $1,000
USD $0
USD $0

Assets in Scope

Smart contract - DAI-xDAI TokenBridge contract on the Ethereum Mainnet
Smart contract - DAI-xDAI OmniBridge contract on the xDai chain
Smart contract - ETH-xDAI OmniBridge contract on the Ethereum Mainnet
Smart contract - ETH-xDAI OmniBridge contract on the xDai chain
Smart contract - BSC-xDAI OmniBridge contract on the Binance Smart Chain
Smart contract - BSC-xDAI OmniBridge contract on the xDai chain

Prioritized Vulnerabilities

We are especially interested in receiving and rewarding vulnerabilities of the following types:

Smart Contracts/Blockchain:

  • Re-entrancy
  • Logic errors
    • including user authentication errors
  • Solidity/EVM details not considered
    • including integer over-/under-flow
    • including unhandled exceptions
  • Trusting trust/dependency vulnerabilities
    • including composability vulnerabilities
  • Oracle failure/manipulation
  • Novel governance attacks
  • Economic/financial attacks
    • including flash loan attacks
  • Congestion and scalability
    • including running out of gas
    • including block stuffing
    • including susceptibility to frontrunning
  • Consensus failures
  • Cryptography problems
    • Signature malleability
    • Susceptibility to replay attacks
    • Weak randomness
    • Weak encryption
  • Susceptibility to block timestamp manipulation
  • Missing access controls / unprotected internal or debugging interfaces

Out of Scope & Rules

The following vulnerabilities are excluded from the rewards for this bug bounty program:

  • Attacks that the reporter has already exploited themselves, leading to damage
  • Attacks requiring access to leaked keys/credentials
  • Attacks requiring access to privileged addresses (governance, strategist)
  • Incorrect data supplied by third party oracles
    • Not to exclude oracle manipulation/flash loan attacks
  • Basic economic governance attacks (e.g. 51% attack)
  • Lack of liquidity
  • Best practice critiques
  • Sybil attacks

The following activities are prohibited by bug bounty program:

  • Any testing with mainnet or public testnet contracts; all testing should be done on private testnets
  • Any testing with pricing oracles or third party smart contracts
  • Attempting phishing or other social engineering attacks against our employees and/or customers
  • Any testing with third party systems and applications (e.g. browser extensions) as well as websites (e.g. SSO providers, advertising networks)
  • Any denial of service attacks
  • Automated testing of services that generates significant amounts of traffic
  • Public disclosure of an unpatched vulnerability in an embargoed bounty