Prerequisites

The development environment

Before you start, set up the development environment:

1. Install Foundry by running the following command:

   curl -L https://foundry.paradigm.xyz | bash \ 
   foundryup

2. Install the required dependencies:

   forge install OpenZeppelin/openzeppelin-contracts
   forge install Uniswap/v2-periphery

3. Configure foundry.toml:

   [profile.default]
   auto_detect_solc = false
   block_timestamp = 1_680_220_800
   bytecode_hash = "none"
   evm_version = "paris"
   fuzz = { runs = 1_000 }
   gas_reports = ["*"]
   optimizer = true
   optimizer_runs = 10_000
   solc = "0.8.25"
   
   [fmt]
   bracket_spacing = true
   int_types = "long"
   line_length = 120
   multiline_func_header = "all"
   number_underscore = "thousands"
   quote_style = "double"
   tab_width = 4
   wrap_comments = true

The project structure

Create the following project structure:

orders/
├── mocks/            # Mock services
├── script/           # Deployment scripts
├── src/              # Core contracts
└── test/             # Test files

Full code

You can find the full code of the example on GitHub: /orders

Required knowledge

Warden features

You should learn about the following Warden features:

• Warden Agent Kit
• Warden precompiles
  • x/warden: Managing keys and handling signature requests
    Functions: keyById(), newSignRequest()
  • x/oracle: The price feed system and data retrieval methods
    Functions: getPrice()
  • x/async: Future-based operations and the price prediction system
    Functions: addFuture, futureById()

Solidity

Guides in this section require the knowledge of the following Solidity concepts:

• Contract inheritance
• Interface implementation
• Events and error handling
• Factory patterns

You should be also familiar with the following smart contract patterns:

abstract contract Base {
 // Base functionality
}

interface IExecution {
 // Execution interface
}

contract Implementation is Base, IExecution {
 // Implementation details
}

Next steps

After meeting these prerequisites, you can start creating helpers and utils.