ChildkeyTake

Storage Map v195 → current

Take rate for a child hotkey on a subnet .

Queried by: validatorsdelegatorsanalytics

The Big Picture

When a parent delegates stake to a child, the child earns rewards. ChildkeyTake is the child's commission - the percentage they keep before passing rewards back to the parent. Higher take means more for the child, less for the delegating parent.

Why This Matters

What cut does this child keep? ChildkeyTake determines how much flows back to parents. Lower take = better for parents; higher take = better for child operators.

Example Scenario

Query ChildkeyTake(hotkey=child_Y, netuid=1) returns 1500. That's 15% take (1500/10000). The child keeps 15% of their earnings, passing 85% to parents.

Common Questions

How do basis points work?: 1500 basis points = 15%. 10000 = 100%. Divide by 100 to get percentage.
Are there limits on take?: Yes, check MinChildkeyTake and MaxChildkeyTake for the allowed range.
Who sets the take rate?: The child hotkey sets their own take rate. Parents choose whether to accept it by establishing or maintaining the relationship.

Use Cases

Check child commission rate before establishing relationship
Compare child hotkeys by take rate
Calculate parent returns after child take
Build child key comparison tools
Analyze child key economics

From Chain Metadata

DMAP ( hot, netuid ) --> take | Returns the hotkey childkey take for a specific subnet

Purpose & Usage

Purpose

Track what percentage child receives from allocated rewards - their commission.

Common Query Patterns

Query by hotkey and netuid
Compare child take rates
Calculate net returns from child relationships

Notes

Value is in basis points

Part of: Child Hotkeys

Query Keys

#	Name	Type	Description
1	key1	AccountId	key1 (AccountId) (hex -> SS58)
2	key2	u16	key2 (u16)

Stored Value

u16

value (u16)

Relationships

Modified By

set_childkey_take swap_hotkey

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 });

// Query ChildkeyTake storage
const key1 = "5GrwvaEF5zXb26Fz9rcQpDWS57CtERHpNehXCPcNoHGKutQY";
const key2 = 0;

const result = await api.query
  [stringCamelCase("SubtensorModule")]
  [stringCamelCase("ChildkeyTake")](
  key1,
  key2
);

console.log("ChildkeyTake:", result.toHuman());

On-Chain Activity

Write Frequency

●●○○○○ Minimal <10K est. writes

<10K estimated writes

#58 most written storage item

Write Source User Extrinsics

Modified via user-submitted extrinsics

As of block 7,429,232

Runtime Info

View Source

Pallet: SubtensorModule
Storage Kind: Map
First Version: v195
Current Version: v393

Back to SubtensorModule Storage