Deploy

Now that we have developed our contract, tested it, we can now deploy it on a blockchain!

Local Deployment (default)

If no --url is provided, Pop CLI automatically launches a local ink-node in the background.

pop up -p ./path-to-contract \
  --constructor <constructor_name> \
  --args <arg_1> <arg_2> ... \
  --suri //Alice \

• --path: points to the contract directory

• --constructor: method name (default: new)

• --args: constructor arguments

• --suri: secret key URI (default: //Alice)

• No --url: spins up ws://localhost:9944 automatically

If at anytime you need to stop the node you can do the following:

1. Find the process ID by running the following command: lsof -i :9944

2. Kill the process by running the kill command and passing in the ID of the process:

   • kill -9 3537

When you have successfully deployed your contract you will get the following output:

pop up -p ./flipper --constructor new --args false --suri //Alice --url ws://127.0.0.1:9944

┌   Pop CLI : Deploy a smart contract
│
◐  Doing a dry run to estimate the gas...                                                                                                    
●  Gas limit Weight { ref_time: 264725731, proof_size: 16689 }
│  
◇  Contract deployed and instantiated: The Contract Address is "5CLPm1CeUvJhZ8GCDZCR7nWZ2m3XXe4X5MtAQK69zEjut36A"
│
└  Deployment complete

Save the Contract Address which you will need to interact with the contract.

Deploy to Custom or Public Network

To deploy on a specific network, supply a --url:

pop up -path ./my_contract \
  --url ws://<network-endpoint> \
  --constructor <name> \
  --args <arg_1> <arg_2> \
  --suri <your-SURI-or-use-wallet> 

Alternatively, use --use-wallet to sign via browser wallet (PolkadotJS, Talisman, SubWallet) instead of exposing private keys.

Gas

When deploying a smart contract you need to know how much gas is needed so you can pay accordingly. To find an estimate of how much gas you will need, you can do a "dry-run" of the contract:

pop up --constructor new --args false --suri //Alice --dry-run

This will perform a dry-run via an RPC call to estimate the gas usage. It does not submit a transaction.

┌   Pop CLI : Deploy a smart contract
│
◇  Gas limit estimate: Weight { ref_time: 146346224, proof_size: 16689 }

You can now see the estimate and make sure your account is properly funded with that amount.

It is also possible to only upload the contract and not instantiate by adding --upload-only. More on this check out the ink! docs.

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