sudo_toggle_evm_precompile
Call v238 → current #62Enables or disables an EVM precompile contract.
View calls on chainCall Workflow
This diagram shows the call execution flow: starting with sudo_toggle_evm_precompile, passing through validation
(signature, nonce, mortality, fee payment), then pre-dispatch checks, followed by dispatch which emits events: PrecompileUpdated and modifies storage: AdminUtils.PrecompileEnable, and finally post-dispatch where ExtrinsicSuccess is emitted and fees are settled.
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Used by: subnet owners
The Big Picture
Precompiles are special EVM contracts at fixed addresses. This controls which are available.
Use Cases
- Enabling new EVM features
- Disabling vulnerable precompiles
From Chain Metadata
Toggles the enablement of an EVM precompile.
Input Parameters
| # | Name | Type | Description |
|---|---|---|---|
| 0 | precompile_id | PrecompileEnum | precompile_id (PrecompileEnum) |
| 1 | enabled | bool | enabled (bool) |
Permissions
Origin
Root
Required Role
Permission data inferred from metadata. May be incomplete.
Requirements
- Caller is root account
- Valid precompile ID
Effects
Events Emitted
Storage Modified
Postconditions
- PrecompileEnable updated
Side Effects
- EVM contracts using this precompile may break if disabled
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_toggle_evm_precompile call
const precompile_id = 0 as any /* PrecompileEnum */;
const enabled = true;
const call = api.tx[stringCamelCase("AdminUtils")][stringCamelCase("sudo_toggle_evm_precompile")](
precompile_id,
enabled
);Runtime Info
View Source- Pallet Index
- 19
- Call Index
- 62
- First Version
- v238
- Current Version
- v393