Where can I learn more about Hemi?

You can learn more about Hemi by reading our documentation, visiting our website, reading the whitepaper, or joining the community on Discord.

How do I earn points, and how does incentivized testnet work?

Check out Incentives for the most recent info.

Smart Contract Deployments

Why is my smart contract deployment failing on the testnet even though the contract seems to be created?

๐ŸŒ Overview

  • Deployment issues on testnet can stem from using features or opcodes not yet supported by the testnet's version of the EVM.

  • Check the Raw trace tab

๐Ÿ‘€ Common Culprits

  • One frequent cause is the use of the PUSH0opcode, which was introduced in EIP-3855 with the Shanghai upgrade.

โœ… Solutions

  • To avoid such issues, it's best to wait until testnet officially supports these new features before attempting to deploy contracts that rely on them.

  • ๐Ÿ“œ We will make an announcement when we update this soon!

Gas Usage (e.g. are you at 100%?)

๐ŸŒ Overview

  • Deployment failures can often be traced back to insufficient gas allocation.

  • When a transaction consumes all allocated gas without completing, the network rejects it to avoid executing transactions that could run indefinitely.

๐Ÿ‘€ Common Culprits

  • 100% Gas Consumption: If a transaction fails and the gas usage is 100%, it suggests the gas limit set for the contract's deployment was too low to cover the computation required.

    • Check Gas usage & limit by txn

โœ… Solutions

  • Increase Gas Limit: Adjust the gas limit upwards based on the complexity of your contract and the estimations provided by gas estimation tools.

  • Optimize Contract Code: Review and optimize your smart contract code to reduce gas consumption. This can involve simplifying functions, removing unnecessary operations, or leveraging patterns that consume less gas.

  • Test Thoroughly

Did you verify your Smart Contract?

๐ŸŒ Overview

Preparing your smart contract for deployment involves a critical step: verification. This process not only helps in catching potential issues early but also enhances the contract's integrity before it goes live.

๐Ÿ” Verification is Key

Verifying your smart contract is paramount to ensure its readiness for deployment. This crucial step provides valuable insights into any potential errors or vulnerabilities that could compromise its performance or security.

๐Ÿ›  Steps to Verify:

  • Navigate to Contract Details: Access your contract's details within your development environment or via a testnet blockchain explorer where your contract will be deployed.

  • Look for the Verify and Publish option. Selecting this begins the verification process, which is essential for assessing whether your contract operates as intended and is ready for interaction with users.

Read more about verifying smart contracts deployed on Hemi.

What tokens are currently supported?

You can use our platform to access a variety of tokens, including ETH, USDT, USDC, and DAI.

Where is the faucet?

The faucet can be found in the Discord channel. You can get more testnet tokens from there.

What is tunneling? What is a tunnel?

The Hemi Tunnel is designed for seamless cross-chain transactions.

Hemiโ€™s Bitcoin and Ethereum Tunnels improve security while decentralizing asset portability. They do this by leveraging the Hemi Virtual Machine, which gives the network direct awareness of Bitcoinโ€™s and Ethereumโ€™s states.


What is Capsule?

Capsule is an asset transfer protocol that allows anyone to batch and transfer multiple assets in a single package on Hemi. Additionally, it provides users and developers with advanced functionality like gasless transactions, re-routing/recalling, and configurable security.

How are Capsules used for Hemi onboarding?

The Hemi Onboarding Capsule contains all the testnet tokens (tBTC, ETH, and tHEMI) you need to start building / interacting on Hemi in one gasless transaction! Once you claim your onboarding capsule, youโ€™ll have everything you need to try out PoP mining, pay transaction fees, and use Hemiโ€™s tunnels.

How many onboarding Capsules can be claimed?

Only one onboarding Capsule may be claimed per user.

What is included in my Capsule?

tBTC (testnet Bitcoin), ETH (Sepolia ether), tHEMI (testnet HEMI) and a special testnet NFT.

How can I use the assets I redeem?
  • ETH: Ether acquired from your Capsule can be tunneled (bridged) and used to interact with and build dapps on Hemi by paying transaction fees.

  • tBTC: tBTC is essential to run a PoP miner. In the future, you will be able to tunnel your tBTC (and other Bitcoin assets) to Hemi for use in Bitcoin DeFi deployed on Hemi.

Whatโ€™s the benefit of claiming a Capsule on Hemi testnet?
  • Comprehensive Toolkit: Receive all the essential assets needed to begin building on the Hemi testnet in a single, easy-to-access package.

  • Ready-to-Use Resources: Each Capsule includes ETH (Sepolia), tBTC, tHEMI, and a special testnet NFT, enabling you to seamlessly onboard for Testnet in one 1-click.

  • Gasless: A Capsule is delivered through a gasless transaction, meaning you can explore and build without incurring transaction fees.


How do I apply for a grant?


How do we review grants?


Getting Involved

How do I partner with Hemi?

You can find the partnership inquiry form here.

How do we review partnership inquiries?

Read our review process in Partners.

Have more questions or concerns? E-mail support@hemi.xyz or join our Discord.

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