sudo_set_subnet_moving_alpha
Call v244 → current #63Sets the moving alpha parameter for subnet emission calculations.
View calls on chainCall Workflow
This diagram shows the call execution flow: starting with sudo_set_subnet_moving_alpha, passing through validation
(signature, nonce, mortality, fee payment), then pre-dispatch checks, followed by dispatch and modifies storage: SubtensorModule.SubnetMovingAlpha, and finally post-dispatch where ExtrinsicSuccess is emitted and fees are settled.
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Used by: subnet owners
The Big Picture
Controls how quickly subnet emission shares adjust based on performance. Higher alpha means slower changes.
Use Cases
- Tuning emission distribution
- Smoothing subnet rewards
Input Parameters
| # | Name | Type | Description |
|---|---|---|---|
| 0 | alpha | FixedI128 I96F32 | alpha: Signed substrate-fixed i96.32 via .bits codec (inner i128). Real value = bits / 2^32. Two's complement: JS BigInt(hex) does NOT sign-extend — adjust manually for negatives. |
Permissions
Origin
Root
Required Role
Permission data inferred from metadata. May be incomplete.
Requirements
- Caller is root account
Effects
Storage Modified
Postconditions
- SubnetMovingAlpha updated
Side Effects
- Affects emission smoothing across subnets
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 sudo_set_subnet_moving_alpha call (typed, named args)
const alpha = undefined as any /* FixedI128 — replace with real value */;
const tx = api.tx.AdminUtils.sudo_set_subnet_moving_alpha({
alpha,
});Runtime Info
View Source- Pallet Index
- 19
- Call Index
- 63
- First Version
- v244
- Current Version
- v411