Deposit

Event v101 → current #7

Emitted when tokens are deposited into an account.

Useful for: stakersvalidatorsminersanalyticswallets

The Big Picture

Deposits are how new tokens enter your account - primarily from emissions (mining/validating rewards) and staking dividends. Unlike Transfer (which moves existing tokens), Deposit often represents newly created tokens from the emission schedule. This is how you get paid for participating in the network.

Why This Matters

Your earnings on Bittensor arrive as Deposits. If you're mining, validating, or receiving delegation rewards, this event shows each payout. Tracking deposits helps you understand your actual returns and verify you're being paid correctly.

Example Scenario

You're validating on subnet 1. At the end of an epoch, Balances.Deposit fires with your address and 0.5 TAO (500000000 RAO). This is your share of subnet emissions. Over time, these deposits compound into your total earnings.

Common Questions

How often do deposits happen?: Depends on the subnet's tempo (emission interval). Some subnets emit every 12 seconds, others every few minutes. Check the subnet's Tempo parameter.
Why did I get a deposit I didn't expect?: Could be: emission rewards, delegation dividends, fee refunds, or someone sent you tokens. Check the transaction context to understand the source.

Use Cases

Track emission rewards hitting your account
Monitor validator/miner payouts
Build reward tracking dashboards
Verify reward distribution accuracy

How to Use This Event

→ Monitor your account for emission deposits
→ Track reward frequency and amounts over time
→ Build income tracking and tax reporting tools

From Chain Metadata

Some amount was deposited (e.g. for transaction fees).

Triggers

Preconditions

Deposit operation executed

Effects

Postconditions

Account balance increased

Side Effects

May affect total issuance

Event Data

#	Name	Type	Description
0	who	AccountId	Account receiving deposit (hex -> SS58)
1	amount	u64	Deposit amount (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 Deposit events
api.query.system.events((events) => {
  events
    .filter(({ event }) =>
      event.section === stringCamelCase("Balances") &&
      event.method === "Deposit"
    )
    .forEach(({ event }) => {
      console.log("Deposit:", event.data.toHuman());
    });
});

On-Chain Activity

Emission Frequency

●●●●●● Infrastructure >50M emissions

Protocol plumbing — fires on nearly every extrinsic

#2 most emitted event

As of block 7,429,232

Runtime Info

Pallet Index: 5
Event Index: 7
First Version: v101
Current Version: v393

Back to Balances Events