DelegateCalled

Event v334 → current #7

Emitted when a contract executes code from another contract in its own context.

View events on chain

Useful for: developersanalytics

The Big Picture

Delegate calls run another contract's code in the caller's context - enabling library and proxy patterns.

Use Cases

Track library usage
Monitor proxy behavior
Debug delegate call chains

From Chain Metadata

A contract delegate called a code hash.

Triggers

Emitted by

call call_old_weight

Preconditions

Calling contract exists
Target code exists

Effects

Storage Modified

ContractInfoOf

Postconditions

Code executed in caller's context

Side Effects

State changes apply to calling contract

Event Data

#	Name	Type	Description
0	contract	AccountId	Contract executing the delegate call (hex -> SS58)
1	code_hash	H256 CodeHash<T>	Code being executed via delegation

Code Examples

import { createClient, Binary } from "polkadot-api";
import { getWsProvider } from "polkadot-api/ws";
import { sub } from "@polkadot-api/descriptors"; // generated by: npx papi add sub -w wss://entrypoint-finney.opentensor.ai:443

const client = createClient(getWsProvider("wss://entrypoint-finney.opentensor.ai:443"));
const api = client.getTypedApi(sub);

// Subscribe to DelegateCalled events
client.finalizedBlock$.subscribe(async (block) => {
  const events = await api.event.Contracts.DelegateCalled.get(block.hash);
  for (const evt of events) {
    console.log("DelegateCalled:", evt.payload);
  }
});

Runtime Info

Pallet Index: 29
Event Index: 7
First Version: v334
Current Version: v411

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