sudo_set_max_burn
Call v138 → v277, v290 → v298, v301 → v385, v391 → current #23Sets the maximum burn amount for registration on a subnet .
View calls on chainCall Workflow
This diagram shows the call execution flow: starting with sudo_set_max_burn, passing through validation
(signature, nonce, mortality, fee payment), then pre-dispatch checks, followed by dispatch and modifies storage: SubtensorModule.MaxBurn, and finally post-dispatch where ExtrinsicSuccess is emitted and fees are settled.
Press enter or space to select a node. You can then use the arrow keys to move the node around. Press delete to remove it and escape to cancel.
Press enter or space to select an edge. You can then press delete to remove it or escape to cancel.
Click items to navigate. Pan and zoom to explore.
Used by: subnet owners
The Big Picture
Caps how expensive burn registration can become during demand spikes. Keeps subnets accessible.
Use Cases
- Capping registration costs
- Preventing prohibitive burn requirements
From Chain Metadata
The extrinsic sets the maximum burn for a subnet. It is only callable by root and subnet owner. The extrinsic will call the Subtensor pallet to set the maximum burn.
Input Parameters
Permissions
Origin
Root
Required Role
Permission data inferred from metadata. May be incomplete.
Requirements
- Caller is root or subnet owner
- Subnet exists
Effects
Storage Modified
Postconditions
- MaxBurn updated
Side Effects
- Burn registration cannot cost more than this
Code Examples
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_max_burn call (typed, named args)
const netuid = 1;
const max_burn = 0n;
const tx = api.tx.AdminUtils.sudo_set_max_burn({
netuid,
max_burn,
});Version History
v138 block 1,907,363 2 args
v290 block 5,947,548 2 args
v301 block 6,205,194 2 args
v391 block 7,782,857 2 args Current
Runtime Info
View Source- Pallet Index
- 19
- Call Index
- 23
- First Version
- v138
- Current Version
- v411