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 BalanceOf<T>Deposit amount refunded (RAO) (RAO -> TAO (/ 10^9))

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

Runtime Info

Pallet Index
29
Event Index
9
First Version
v334
Current Version
v411
Back to Contracts Events