sudo_set_default_take
Call v138 → current #1Sets the default delegate take percentage for new validators.
View calls on chainCall Workflow
This diagram shows the call execution flow: starting with sudo_set_default_take, passing through validation
(signature, nonce, mortality, fee payment), then pre-dispatch checks, followed by dispatch and modifies storage: SubtensorModule.DefaultTake, and finally post-dispatch where ExtrinsicSuccess is emitted and fees are settled.
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Used by: subnet owners
The Big Picture
Take is the percentage delegates keep from staker emissions. This sets the default for new validators; existing ones keep their configured rate.
Use Cases
- Adjusting default delegation economics
- Network-wide take policy changes
Input Parameters
| # | Name | Type | Description |
|---|---|---|---|
| 0 | default_take | u16 | default_take (u16) |
Permissions
Origin
Root
Required Role
Requirements
- Caller is root account
- Take value is within valid bounds
Effects
Storage Modified
Postconditions
- DefaultTake updated
- New validators use this default
Side Effects
- Does not affect existing validator take rates
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 });
// Build sudo_set_default_take call
const default_take = 0;
const call = api.tx[stringCamelCase("AdminUtils")][stringCamelCase("sudo_set_default_take")](
default_take
);Runtime Info
View Source- Pallet Index
- 19
- Call Index
- 1
- First Version
- v138
- Current Version
- v393