Instantiated

Event v334 → current #0

Emitted when a new smart contract is successfully deployed and instantiated.

Useful for: developersanalytics

The Big Picture

This event marks the birth of a new smart contract. The deployer and contract address are recorded. From this moment, the contract can be called and will execute its WASM code.

Use Cases

Track new contract deployments
Index deployed contracts by address
Monitor deployment activity
Build contract registries

From Chain Metadata

Contract deployed by address at the specified address.

Triggers

Emitted by

instantiate instantiate_with_code instantiate_old_weight instantiate_with_code_old_weight

Preconditions

Valid WASM code provided or code_hash exists in PristineCode
Caller has sufficient balance for storage deposits
Constructor execution succeeded

Effects

Storage Modified

CodeInfoOf ContractInfoOf Nonce PristineCode

Postconditions

Contract exists at the emitted address
ContractInfoOf storage populated
Code reference count incremented

Side Effects

Constructor may have modified contract storage
Constructor may have emitted ContractEmitted events

Event Data

#	Name	Type	Description
0	deployer	AccountId	Account that deployed the contract and paid deposits (hex -> SS58)
1	contract	AccountId	The deployed contract's unique address (hex -> SS58)

Code Examples

import { ApiPromise, WsProvider } from "@polkadot/api";
import { stringCamelCase } from "@polkadot/util";

const provider = new WsProvider("wss://entrypoint-finney.opentensor.ai:443");
const api = await ApiPromise.create({ provider });

// Subscribe to Instantiated events
api.query.system.events((events) => {
  events
    .filter(({ event }) =>
      event.section === stringCamelCase("Contracts") &&
      event.method === "Instantiated"
    )
    .forEach(({ event }) => {
      console.log("Instantiated:", event.data.toHuman());
    });
});

Runtime Info

Pallet Index: 29
Event Index: 0
First Version: v334
Current Version: v393

Back to Contracts Events