Params Precompile

The Params precompile exposes the Cosmos SDK x/params subspaces to the EVM, letting contracts read arbitrary module parameters by subspace and key. It is a read-only precompile deployed at a fixed address.

Address

The Params precompile is available at the following address:

0x0000000000000000000000000000000000001013

Interface

Params.sol

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

address constant PARAMS_PRECOMPILE_ADDRESS = 0x0000000000000000000000000000000000001013;

IParams constant PARAMS_CONTRACT = IParams(PARAMS_PRECOMPILE_ADDRESS);

interface IParams {
    // Queries
    function params(string memory subspace, string memory key) external view returns (string memory value);
}

Methods

params

Returns the value of the parameter identified by subspace and key. The value is returned as its JSON-encoded string representation.

function params(
    string memory subspace,
    string memory key
) external view returns (string memory value);

Parameters

subspace — the name of the params subspace to read from (e.g. "staking").
key — the parameter key within the subspace (e.g. "MaxValidators").

Returns

value — the JSON-encoded value of the requested parameter.

The call reverts if the subspace or key is unknown or empty.

Example Usage

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

import {IParams, PARAMS_CONTRACT} from "./Params.sol";

contract ParamsReader {
    function getMaxValidators() external view returns (string memory) {
        return PARAMS_CONTRACT.params("staking", "MaxValidators");
    }
}

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Params Precompile

Address

Interface

Methods

params

Example Usage

​Address

​Interface

​Methods

​params

​Example Usage

Address

Interface

Methods

params

Example Usage