sudo_set_kappa
Call v138 → current #16Sets the kappa parameter for consensus on a subnet .
View calls on chainCall Workflow
This diagram shows the call execution flow: starting with sudo_set_kappa, passing through validation
(signature, nonce, mortality, fee payment), then pre-dispatch checks, followed by dispatch and modifies storage: SubtensorModule.Kappa, and finally post-dispatch where ExtrinsicSuccess is emitted and fees are settled.
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Used by: subnet owners
The Big Picture
Kappa affects how validator weights translate to consensus outcomes. Part of the Yuma consensus parameters.
Use Cases
- Tuning consensus sensitivity
- Adjusting validator influence
Input Parameters
Permissions
Origin
Root
Required Role
Requirements
- Caller is root or subnet owner
- Subnet exists
Effects
Storage Modified
Postconditions
- Kappa updated
Side Effects
- Affects consensus weight calculations
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_kappa call
const netuid = 1;
const kappa = 0;
const call = api.tx[stringCamelCase("AdminUtils")][stringCamelCase("sudo_set_kappa")](
netuid,
kappa
);Runtime Info
View Source- Pallet Index
- 19
- Call Index
- 16
- First Version
- v138
- Current Version
- v393