decrease_take

Call v149 → v424, v432 → current #65

Decreases the delegate's commission rate.

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Used by: validatorsdevelopers

The Big Picture

Lower take = more attractive to delegators. When you're building reputation or want to grow your stake, competitive commission rates matter. The tradeoff is clear: more delegators but lower margin. Volume vs margin is a classic business decision.

Why This Matters

Delegators compare take rates when choosing validators. All else equal, lower take wins. New validators often start with low take to build stake, then gradually increase as they prove value.

Example Scenario

You're a new validator competing against established ones charging 15%. Call decrease_take(hotkey, new_take=0.08) to offer 8%. Delegators looking for deals will find you attractive. Once you've built 1M TAO in delegation, you can increase later.

Common Questions

Is there a minimum take rate?
Yes, MinDelegateTake prevents a race to zero. You can't set take below this floor (typically a few percent).
How quickly will lowering take attract delegators?
It depends on visibility. Your new rate is on-chain, but delegators need to discover it. Consider announcing rate cuts on community channels.

Use Cases

  • Attract more delegated stake with competitive rates
  • Compete with other validators for delegation
  • Build delegator loyalty with better terms
  • Launch promotional period for new validators

From Chain Metadata

Allows delegates to decrease its take value.

Part of: Delegation

Migration Notes

v424 v432 Breaking

take changed from u16 to PerU16

Update decoders: SCALE encoding is positional, so any signature change (added, removed, or type-changed fields, or storage shape changes) shifts byte offsets and existing decoders will misparse this item. Re-derive types from the new metadata.

Input Parameters

#NameTypeDescription
0
hotkey
AccountId hotkey: Account address (32 bytes, SS58-encoded) (hex -> SS58)
1
take
PerU16 take (PerU16)

Permissions

Origin
Signed
Required Role
Any

Permission data inferred from metadata. May be incomplete.

Requirements

  • Hotkey is a delegate
  • New take < current take
  • New take >= MinDelegateTake
  • Rate limit not exceeded

Effects

Events Emitted

TakeDecreased

Postconditions

  • Delegate take rate decreased

Side Effects

  • Delegators receive larger share of future rewards
  • May attract more delegations

Code Examples

// ----------------------------------------------------------------------
// HEADS UP: 1 arg below has a complex type with no usable default.
// Look for `undefined as any` and replace it with real value
// before running — the snippet compiles, but will fail at runtime as-is.
// ----------------------------------------------------------------------
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);

// Build decrease_take call (typed, named args)
const hotkey = "5GrwvaEF5zXb26Fz9rcQpDWS57CtERHpNehXCPcNoHGKutQY";
const take = undefined as any /* PerU16 — replace with real value */;

const tx = api.tx.SubtensorModule.decrease_take({
  hotkey,
  take,
});

Version History

v149 block 3,014,339 2 args
v432 block 8,636,190 2 args Current

Runtime Info

View Source
Pallet Index
7
Call Index
65
First Version
v149
Current Version
v472
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