> ## Documentation Index
> Fetch the complete documentation index at: https://cosmos-docs-sync-security-docs.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# consensus_params

> Get consensus parameters

Get consensus parameters.

If the `height` field is set to a non-default value, upon success, the
`Cache-Control` header will be set with the default maximum age.



## OpenAPI

````yaml /cometbft/latest/api-reference/rpc/openapi.yaml get /consensus_params
openapi: 3.0.0
info:
  title: CometBFT RPC
  contact:
    name: CometBFT
    url: https://docs.cosmos.network/cometbft
  description: >
    CometBFT supports the following RPC protocols:


    * URI over HTTP

    * JSONRPC over HTTP

    * JSONRPC over websockets


    ## Configuration


    RPC can be configured by tuning parameters under `[rpc]` table in the

    `$CMTHOME/config/config.toml` file or by using the `--rpc.X` command-line

    flags.


    The default RPC listen address is `tcp://127.0.0.1:26657`.

    To set another address, set the `laddr` config parameter to desired value.

    CORS (Cross-Origin Resource Sharing) can be enabled by setting

    `cors_allowed_origins`, `cors_allowed_methods`, `cors_allowed_headers`

    config parameters.


    If testing using a local RPC node, under the `[rpc]`

    section change the `cors_allowed_origins` property, please add the URL of

    the site where this OpenAPI document is running, for example:

      `cors_allowed_origins = ["http://localhost:8088"]`

    or if testing from the official documentation site:

      `cors_allowed_origins = ["https://docs.cosmos.network"]`

    ## Arguments


    Arguments which expect strings or byte arrays may be passed as quoted

    strings, like `"abc"` or as `0x`-prefixed strings, like `0x616263`.


    ## URI/HTTP


    A REST like interface.

        curl localhost:26657/block?height=5

    ## JSONRPC/HTTP


    JSONRPC requests can be POST'd to the root RPC endpoint via HTTP.

        curl --header "Content-Type: application/json" --request POST --data '{"method": "block", "params": ["5"], "id": 1}' localhost:26657

    ## JSONRPC/websockets


    JSONRPC requests can be also made via websocket.

    The websocket endpoint is at `/websocket`, e.g. `localhost:26657/websocket`.

    Asynchronous RPC functions like event `subscribe` and `unsubscribe` are

    only available via websockets.


    For example using the [websocat](https://github.com/vi/websocat) tool, you
    can subscribe for 'NewBlock` events

    with the following command:

        echo '{ "jsonrpc": "2.0","method": "subscribe","id": 0,"params": {"query": "tm.event='"'NewBlock'"'"} }' | websocat -n -t ws://127.0.0.1:26657/websocket
  version: v0.38.x
  license:
    name: Apache 2.0
    url: https://github.com/cometbft/cometbft/blob/v0.38.x/LICENSE
servers:
  - url: https://rpc.cosmos.directory/cosmoshub
    description: Interact with the CometBFT RPC from a public node in the Cosmos registry
  - url: http://localhost:26657
    description: Interact with CometBFT RPC node running locally
security: []
tags:
  - name: Info
    description: Informations about the node APIs
  - name: Tx
    description: Transactions broadcast APIs
  - name: ABCI
    description: ABCI APIs
  - name: Evidence
    description: Evidence APIs
  - name: Unsafe
    description: Unsafe APIs
paths:
  /consensus_params:
    get:
      tags:
        - Info
      summary: consensus_params
      description: |-
        Get consensus parameters

        Get consensus parameters.

        If the `height` field is set to a non-default value, upon success, the
        `Cache-Control` header will be set with the default maximum age.
      operationId: consensus_params
      parameters:
        - in: query
          name: height
          description: >-
            height to return. If no height is provided, it will fetch commit
            informations regarding the latest block.
          schema:
            type: integer
            default: 0
            example: 1
      responses:
        '200':
          description: consensus parameters results.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ConsensusParamsResponse'
        '500':
          description: Error
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
components:
  schemas:
    ConsensusParamsResponse:
      type: object
      required:
        - jsonrpc
        - id
        - result
      properties:
        jsonrpc:
          type: string
          example: '2.0'
        id:
          type: integer
          example: 0
        result:
          type: object
          required:
            - block_height
            - consensus_params
          properties:
            block_height:
              type: string
              example: '1'
            consensus_params:
              $ref: '#/components/schemas/ConsensusParams'
    ErrorResponse:
      description: Error Response
      allOf:
        - $ref: '#/components/schemas/JSONRPC'
        - type: object
          properties:
            error:
              type: string
              example: Description of failure
    ConsensusParams:
      type: object
      nullable: true
      required:
        - block
        - evidence
        - validator
      properties:
        block:
          type: object
          required:
            - max_bytes
            - max_gas
            - time_iota_ms
          properties:
            max_bytes:
              type: string
              example: '22020096'
            max_gas:
              type: string
              example: '1000'
            time_iota_ms:
              type: string
              example: '1000'
        evidence:
          type: object
          required:
            - max_age
          properties:
            max_age:
              type: string
              example: '100000'
        validator:
          type: object
          required:
            - pub_key_types
          properties:
            pub_key_types:
              type: array
              items:
                type: string
              example:
                - ed25519
    JSONRPC:
      type: object
      properties:
        id:
          type: integer
          example: 0
        jsonrpc:
          type: string
          example: '2.0'

````