Migrating to Avalanche C-Chain often comes with gas management errors. Teams copy Ethereum logic and end up overpaying or having transactions fail. We help avoid this: we configure Foundry/Hardhat, verify contracts on Snowtrace, and optimize gas for Avalanche's EIP-1559. Gas savings can reach 95%, and our clients save an average of 80% on transaction costs. Avalanche EVM is compatible with Ethereum, which simplifies migration, but attention to RPC settings and gas price is required.
What is Avalanche C-Chain and Why It Deserves Separate Consideration
Avalanche consists of three chains: C-Chain (EVM), X-Chain (UTXO), and P-Chain (staking). For smart contracts, we use C-Chain — it's compatible with Ethereum, but gas is orders of magnitude cheaper. Deploying a typical ERC-20 costs pennies compared to tens of dollars on Ethereum. Avalanche EVM supports all standard tools: Hardhat, Foundry, ethers.js.
Comparison of ERC-20 Deployment Costs Across Networks
| Network | Average deployment cost | Confirmation time |
|---|---|---|
| Ethereum | $15–50 | 1–2 min |
| Arbitrum | $0.2–1 | 10–30 sec |
| Avalanche C-Chain | $0.05–0.30 | 2–3 sec |
How We Configure Tools for Deploying on Avalanche
We use Foundry or Hardhat — depending on the requirements. Configuration boils down to adding the RPC endpoint and chainId.
Foundry
In foundry.toml, we set the RPC and Snowtrace API key:
[profile.default] src = "src" out = "out" libs = ["lib"] solc = "0.8.20" [rpc_endpoints] avalanche = "https://api.avax.network/ext/bc/C/rpc" fuji = "https://api.avax-test.network/ext/bc/C/rpc" [etherscan] avalanche = { key = "${SNOWTRACE_API_KEY}", url = "https://api.snowtrace.io/api" } fuji = { key = "${SNOWTRACE_API_KEY}", url = "https://api-testnet.snowtrace.io/api" } Deploy with verification:
forge script script/Deploy.s.sol:DeployScript \ --rpc-url fuji \ --broadcast \ --verify \ -vvvv Hardhat
Configuration in hardhat.config.ts:
const config: HardhatUserConfig = { solidity: '0.8.20', networks: { fuji: { url: 'https://api.avax-test.network/ext/bc/C/rpc', chainId: 43113, accounts: [process.env.PRIVATE_KEY!], gasPrice: 'auto', }, avalanche: { url: 'https://api.avax.network/ext/bc/C/rpc', chainId: 43114, accounts: [process.env.PRIVATE_KEY!], }, }, etherscan: { apiKey: { avalanche: process.env.SNOWTRACE_API_KEY!, fuji: process.env.SNOWTRACE_API_KEY!, }, customChains: [ { network: 'avalanche', chainId: 43114, urls: { apiURL: 'https://api.snowtrace.io/api', browserURL: 'https://snowtrace.io', }, }, { network: 'fuji', chainId: 43113, urls: { apiURL: 'https://api-testnet.snowtrace.io/api', browserURL: 'https://testnet.snowtrace.io', }, }, ], }, }; Comparison of Foundry and Hardhat for Avalanche
| Parameter | Foundry | Hardhat |
|---|---|---|
| Compilation speed | Faster (Rust) | Slower (JS) |
| Snowtrace verification | Via --verify | Via hardhat-etherscan plugin |
| Built-in fuzz testing | Yes | Via plugin |
| Gas reports | Yes | Yes |
| Multi-network handling | Via scripts | Via tasks |
Why Choose Foundry for Avalanche?
Foundry compiles contracts in Rust — giving up to 10x speed boost on large projects. The built-in fuzz tester finds edge cases that Hardhat might miss. This is especially important for Avalanche due to its specific gas model. We use Foundry by default unless the project requires specific Hardhat plugins.
How to Set Up Chainlink on Avalanche?
Chainlink is available on C-Chain mainnet: Price Feeds, VRF v2, and Automation. Contract addresses differ from Ethereum — they must be taken from the official documentation at Chainlink Avalanche. We include integration in the deploy script: for Price Feeds, just specify the feed address and add a constructor call. We test on Fuji testnet, then deploy to mainnet.
Pitfalls When Deploying on Avalanche
AVAX decimals are 18, like ETH. Standard gas calculations work, but do not copy hardcoded gas price from Ethereum. Block gas limit is 15,000,000 gas per block; contracts up to 24KB deploy without issues. The public RPC api.avax.network has rate limits, so for production use Infura, Alchemy, or QuickNode. Chainlink on Avalanche requires verifying addresses against the docs.
Deployment Process: Step by Step
- Analyze existing contracts and dependencies.
- Configure Foundry/Hardhat with Fuji testnet RPC.
- Write deployment script with verification.
- Test on Fuji testnet.
- Deploy to mainnet C-Chain.
- Integrate Chainlink (if needed).
- Document and hand over the project.
Order your contract deployment — we'll prepare an estimate within 1 day.
Estimated Timelines
Deployment of an existing Ethereum contract — from 4 hours. If Chainlink or other external service integration is needed — up to 2 days. Cost is calculated individually. Contact us for a project assessment.
When Is an Avalanche Subnet Needed?
If you require privacy, a custom gas token, or high throughput, you can deploy your own Subnet. However, for most projects C-Chain is sufficient. We help assess the need for a Subnet and deploy it if necessary.
Detailed Avalanche Subnet Configuration
To launch a Subnet, at least 5 validators are required, who also validate the C-Chain. We provide scripts for Subnet deployment using Avalanche CLI and gas limit settings.What Is Included
- Documentation on configuration and deployment
- Access to a private repository with scripts
- Team training on the basics of working with Avalanche C-Chain
- Technical support for 2 weeks after deployment
Security guarantee — all contracts undergo basic vulnerability checks (reentrancy, overflow). Team experience — over 5 years in blockchain development.
Get a free consultation and project assessment — contact us.