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Shell Protocol

Shell Protocol is a set of EVM-based smart contracts on Arbitrum One. Unlike other DeFi protocols that rely on monolithic, single-purpose smart contracts, Shell is a hub for a modular ecosystem of services. Its design makes it much simpler to bundle several smart contracts or build new ones, and for users to batch many services in one transaction.

Arbitrum
Defi
NFT
AMM
DEX
Staking
JavaScript
Solidity
Maximum Bounty
$100,000
Live Since
11 March 2021
Last Updated
08 April 2024
  • PoC required

Submit a Bug

Rewards by Threat Level

Smart Contract
Critical
USD $100,000
High
USD $20,000
Medium
USD $5,000
Low
USD $1,000
Websites and Applications
Critical
USD $10,000
High
USD $3,000
Medium
USD $1,500
Low
USD $500

Rewards by Threat Level are distributed according to the impact the vulnerability could otherwise cause based on the Impacts in Scope table further below.

Reward Calculation for Critical Level Reports

For critical Smart Contract bugs, the reward amount is 10% of the funds directly affected up to a maximum of $100,000 USD. The calculation of the amount of funds at risk is based on the time and date the bug report is submitted. However, a minimum reward of $25,000 USD is to be rewarded in order to incentivize security researchers against withholding a bug report.

Repeatable Attack Limitations

In cases of repeatable attacks for smart contract bugs, only the first attack is considered if the smart contracts where the vulnerability exists can be upgraded, paused, or killed. If the attack impacts a smart contract directly holding funds that cannot be upgraded or paused, the amount of funds at risk will be calculated with the first attack being at 100% of the funds that could be stolen and then a reduction of 25% from the amount of the first attack for every 300 blocks the attack needs for subsequent attacks from the first attack, rounded down.

Proof of Concept (PoC) Requirements

A PoC is required for the following severity levels:

  • Smart Contracts, Critical Severity Level
  • Smart Contracts, High Severity Level
  • Smart Contracts, Medium Severity Level
  • Smart Contracts, Low Severity Level
  • Web/App, All Levels

All PoCs submitted must comply with the Immunefi-wide PoC Guidelines and Rules. Bug report submissions without a PoC when a PoC is required will not be provided with a reward.

Reward Payment Terms

Payouts are handled by the Shell Protocol team directly and are denominated in USD. Payments will be issued in USDC or ETH.

Program Overview

Shell Protocol is a set of EVM-based smart contracts on Arbitrum One. Unlike other DeFi protocols that rely on monolithic, single-purpose smart contracts, Shell is a hub for a modular ecosystem of services. Its design makes it much simpler to bundle several smart contracts or build new ones, and for users to batch many services in one transaction.

Known for simplifying DeFi for both users and developers, Shell is a public resource to be governed by the upcoming Shell DAO.

For more information about Shell Protocol, please visit https://shellprotocol.io/

Payouts are handled by the Shell Protocol team directly and are denominated in USD. Payouts are done in USDC.. For more details about the payment process, please view the Rewards by Threat Level section further below.

Responsible Publication

Shell Protocol adheres to category 1. This Policy determines what information whitehats are allowed to make public from their submitted bug reports. For more information about the category selected, please refer to our Responsible Publication page.

Primacy of Rules

Shell Protocol adheres to the Primacy of Rules, which means that the whole bug bounty program is run strictly under the terms stated in this page.

Immunefi Severity Classification System

This program was designed using the Immunefi classification system. Bugs are classified on a simplified 4-level scale:

  • Critical
  • High
  • Medium
  • Low

See: Immunefi Vulnerability Severity Classification System v2.3

KYC not required

No KYC information is required for payout processing.

Prohibited Activities

Default prohibited activities
  • Any testing on mainnet or public testnet deployed code; all testing should be done on local-forks of either public testnet or mainnet
  • 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 that are executed against project assets
  • Automated testing of services that generates significant amounts of traffic
  • Public disclosure of an unpatched vulnerability in an embargoed bounty
  • Any other actions prohibited by the Immunefi Rules

Feasibility Limitations

The project may be receiving reports that are valid (the bug and attack vector are real) and cite assets and impacts that are in scope, but there may be obstacles or barriers to executing the attack in the real world. In other words, there is a question about how feasible the attack really is. Conversely, there may also be mitigation measures that projects can take to prevent the impact of the bug, which are not feasible or would require unconventional action and hence, should not be used as reasons for downgrading a bug's severity. Therefore, Immunefi has developed a set of feasibility limitation standards which by default states what security researchers, as well as projects, can or cannot cite when reviewing a bug report.