# Runtime configuration (/docs/guides/evm/precompiles/runtime-configuration)

| Property           | Value                                        |
| ------------------ | -------------------------------------------- |
| Implementation     | `RuntimeConfigurationPrecompile`             |
| Solidity interface | `IRuntimeConfiguration`                      |
| Address            | `0x0000000000000000000000000000000000000812` |
| Status             | Deployed                                     |

This domain contains bounded typed views of runtime configuration. The grouped
constant views read their values from the runtime and therefore reflect the
runtime version executing the call.

## Views [#views]

| Function                              | Meaning                                                                                                |
| ------------------------------------- | ------------------------------------------------------------------------------------------------------ |
| `getEvmChainId()`                     | Current EVM chain identifier                                                                           |
| `getTransactionRateLimit()`           | Global Subtensor transaction rate limit                                                                |
| `getSubtensorEconomicConstants()`     | Initial issuance, burn, stake, transfer, registration-lock, and key-swap balance constants             |
| `getSubtensorSubnetConstants()`       | Subnet size, tempo, immunity, activity, owner-cut, and epoch limits                                    |
| `getSubtensorConsensusConstants()`    | Initial weight, emission, Yuma, bonds, pruning, and TAO-weight configuration                           |
| `getSubtensorRegistrationConstants()` | Registration difficulty, adjustment, rate-limit, immunity, lock-reduction, and price-EMA configuration |
| `getSubtensorDelegationConstants()`   | Initial delegate and childkey takes plus Liquid Alpha and Yuma feature defaults                        |
| `getSubtensorRateLimitConstants()`    | Transaction, serving, EVM-association, swap, dissolution, start-call, and lease timing constants       |
| `getSubtensorProtocolConstants()`     | Fixed public protocol bounds, flags, voting-power timing, lock timing, and maximum TAO issuance        |
| `getSubtensorSystemAccounts()`        | Derived Subtensor pallet and burn accounts as `bytes32`                                                |
| `getBalancesConstants()`              | Existential deposit and lock, reserve, and freeze limits                                               |
| `getProxyConstants()`                 | Proxy and announcement deposits and count limits                                                       |
| `getSchedulerConstants()`             | Maximum scheduler weight and calls per block                                                           |
| `getDrandConstants()`                 | Quicknet chain hash, unsigned transaction configuration, and pulse-retention limits                    |
| `getCrowdloanConstants()`             | Deposit, contribution, duration, contributor, refund, and pallet-account configuration                 |
| `getSwapConstants()`                  | Maximum fee rate, minimum liquidity and reserve, and derived protocol account                          |
| `getTimestampConstants()`             | Minimum timestamp period                                                                               |
| `getAdminConstants()`                 | Maximum authority count                                                                                |

## Constant representation [#constant-representation]

All balance-valued constants are returned as `uint256` values using EVM's
18-decimal convention. Block numbers, durations, percentages, fixed-point
parts, and count limits retain the units stated by their Solidity output
names. `PalletId` configuration is wrapped as the derived 32-byte account that
contracts can use.

A runtime upgrade may change a constant's returned value. The function
selector, output type and order, units, and documented meaning remain the
compatibility contract.

## State-changing operations [#state-changing-operations]

The currently identified global configuration extrinsics are Root-only:

```text
AdminUtils.swap_authorities
AdminUtils.sudo_set_tx_rate_limit
AdminUtils.sudo_set_evm_chain_id
AdminUtils.schedule_grandpa_change
```

They are not exposed as typed EVM operations. A future view must return a
typed, bounded representation and must not expose SCALE-encoded runtime values.

Source: [`runtimeConfiguration.sol`](https://github.com/RaoFoundation/subtensor/blob/main/precompiles/src/solidity/runtimeConfiguration.sol)