NetworkLockCostReductionIntervalSet

Event Re-added v134 → v135, v136 → v141, v142 → v148, v149 → v165, v195 → v219, v233 → v247, v252 → v265, v273 → v277, v290 → v315, v320 → v326, v334 → v367, v372 → current #61

Emitted when lock cost reduction interval is changed.

View events on chain

Useful for: subnet ownersdevelopersanalytics

The Big Picture

After high-demand periods, subnet lock costs should decrease toward the minimum. This interval controls how quickly that happens. Shorter intervals mean faster cost reduction (quicker return to baseline). Longer intervals mean costs stay elevated longer after demand spikes.

Why This Matters

If lock costs spiked due to high demand, understanding the reduction interval helps you decide whether to wait or act now. Faster reduction means cheaper costs soon. Slower reduction means waiting may not help much - costs stay elevated longer.

Example Scenario

Lock cost reduction was happening every 1000 blocks. To smooth out cost volatility, they increase the interval to 5000 blocks. NetworkLockCostReductionIntervalSet fires. Now lock costs decrease more slowly after spikes - less volatile but costs stay higher longer.

Common Questions

How much does cost reduce per interval?: Depends on the reduction algorithm. Check the specific reduction step parameter. The interval is WHEN it happens; the step is HOW MUCH.
Can I predict when costs will reach minimum?: Roughly. Track current cost, reduction interval, and reduction step. Extrapolate when cost will hit NetworkMinLockCost. But new demand can spike costs again.
What if demand stays high?: Costs stay elevated. Reduction happens when demand drops. If demand remains high, costs won't decrease even with intervals passing.

Use Cases

Track lock cost reduction dynamics
Plan optimal timing for subnet creation
Monitor network economic tuning
Build cost prediction tools

How to Use This Event

→ Track reduction interval for cost timing optimization
→ Monitor economic policy changes
→ Build cost decay prediction models

From Chain Metadata

the lock cost reduction is set

Triggers

Preconditions

Caller has admin/sudo privileges

May fail with

NetworkDoesNotExist SubNetworkDoesNotExist RootNetworkDoesNotExist NetworkExist HotKeyNotRegisteredInNetwork EmissionValuesDoesNotMatchNetworks DidNotPassConnectedNetworkRequirement NetworkTxRateLimitExceeded IncorrectNetworkVersionKey AllNetworksInImmunity CanNotSetRootNetworkWeights

Effects

Postconditions

NetworkLockReductionInterval updated

Side Effects

Affects how quickly lock costs decrease

Event Data

#	Name	Type	Description
0	arg0	u64	Event field #0 (u64)

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

Version History

Version:

v134 block 1,455,498 1 args

v136 block 1,756,781 1 args

v142 block 2,543,779 1 args

v149 block 3,014,339 1 args

v195 block 3,791,350 1 args

v233 block 4,920,350 1 args

v252 block 5,163,656 1 args

v273 block 5,659,032 1 args

v290 block 5,947,548 1 args

v320 block 6,523,566 1 args

v334 block 6,811,690 1 args

v372 block 7,430,358 1 args Current

Runtime Info

View Source

Pallet Index: 7
Event Index: 61
First Version: v134
Current Version: v393

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