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Local Starknet Devnet Setup

Problem

The starknet Dart package (v0.2.0) has incomplete V3 transaction support (missing l1_data_gas field), and all free public RPC endpoints either:

  • Require V3 transactions (Alchemy)
  • Are deprecated (BlastAPI)
  • Have DNS/compatibility issues (Nethermind, Lava)

Solution: Run Local Devnet

Step 1: Install Starknet Devnet

# Using Docker (recommended)
docker pull shardlabs/starknet-devnet-rs:latest

# OR using cargo
cargo install starknet-devnet

Step 2: Run Devnet

# Using Docker
docker run -p 5050:5050 shardlabs/starknet-devnet-rs:latest

# OR using cargo
starknet-devnet --host 0.0.0.0 --port 5050

Step 3: Update Your App Configuration

  1. Update lib/config/constants.dart:

    static const String rpcUrl = 'http://YOUR_COMPUTER_IP:5050';

    Replace YOUR_COMPUTER_IP with your computer's local IP address (e.g., 192.168.1.100)

  2. Deploy your contract to devnet (you'll need to redeploy since it's a fresh network)

  3. Fund your deployer account using devnet's predeployed accounts

Step 4: Get Your Computer's IP

# On macOS/Linux
ifconfig | grep "inet " | grep -v 127.0.0.1

# On Windows
ipconfig

Alternative: Use Infura (Requires Free Signup)

  1. Sign up at https://www.infura.io/
  2. Create a new Starknet project
  3. Get your API key
  4. Update RPC URL to: https://starknet-sepolia.infura.io/v3/YOUR_API_KEY

Note: Infura may also require V3 transactions, so local devnet is the most reliable option.