CreatedFailed

Event v210 → current #2

Emitted when contract creation fails during execution.

View events on chain

Useful for: developers

The Big Picture

Deployment failures indicate constructor reverts, gas issues, or invalid bytecode. Use transaction traces to debug.

Use Cases

Debug failed deployments
Monitor success rates

From Chain Metadata

A contract was attempted to be created, but the execution failed.

Triggers

Emitted by

create create2

Preconditions

Creation attempted
Execution error occurred

Effects

Storage Modified

AccountCodes AccountCodesMetadata AccountStorages

Postconditions

No code stored
Gas consumed to failure point

Side Effects

State changes reverted

Event Data

#	Name	Type	Description
0	address → intended_address	H160	Address where contract would have been deployed (H160)

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 CreatedFailed events
api.query.system.events((events) => {
  events
    .filter(({ event }) =>
      event.section === stringCamelCase("EVM") &&
      event.method === "CreatedFailed"
    )
    .forEach(({ event }) => {
      console.log("CreatedFailed:", event.data.toHuman());
    });
});

Runtime Info

Pallet Index: 22
Event Index: 2
First Version: v210
Current Version: v393

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