StorageDepositTransferredAndReleased

Event v334 → current #9

Emitted when a storage deposit is refunded due to storage cleanup.

View events on chain
Useful for: developersanalytics

The Big Picture

When storage is freed, deposits are refunded. Net cost = held - released.

Use Cases

  • Track storage refunds
  • Monitor cleanup activities
  • Calculate net costs

From Chain Metadata

Some storage deposit funds have been transferred and released.

Triggers

Emitted by

call

Preconditions

  • Contract operation decreased storage
  • Deposit was held

Effects

Storage Modified

ContractInfoOf

Postconditions

  • Deposit released to beneficiary

Side Effects

  • Beneficiary's free balance increased

Event Data

#NameTypeDescription
0
from
AccountId Contract or system releasing the deposit (hex -> SS58)
1
to
AccountId Account receiving the refund (hex -> SS58)
2
amount
u64 Deposit amount refunded (RAO) (RAO -> TAO (/ 10^9))

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

Runtime Info

Pallet Index
29
Event Index
9
First Version
v334
Current Version
v393
Back to Contracts Events