FeeRateSet

Event v290 → current #0

Emitted when the swap fee rate is updated for a subnet 's liquidity pool.

View events on chain

Useful for: subnet ownersstakersdevelopersanalytics

The Big Picture

Fee rates determine LP earnings per swap. Changes affect yield projections.

Use Cases

Track fee parameter changes
Update yield calculations
Monitor governance actions

From Chain Metadata

Event emitted when the fee rate has been updated for a subnet

Part of: Concentrated Liquidity

Triggers

Emitted by

set_fee_rate

Preconditions

Admin/sudo call succeeded
Subnet exists
Fee rate within MaxFeeRate

Effects

Storage Modified

FeeRate

Postconditions

FeeRate storage updated
All future swaps use new fee

Side Effects

May affect LP returns

Event Data

#	Name	Type	Description
0	netuid	u16	Subnet ID for which the fee rate was set
1	rate	u16	rate (u16)

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

Runtime Info

View Source

Pallet Index: 28
Event Index: 0
First Version: v290
Current Version: v393

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