> ## Documentation Index
> Fetch the complete documentation index at: https://docs.magicblock.gg/llms.txt
> Use this file to discover all available pages before exploring further.

# getBlockhashForAccounts

> Get blockhash for multiple account addresses.



## OpenAPI

````yaml /pages/ephemeral-rollups-ers/api-reference/er/openapi/openapi-getBlockhashForAccounts.json POST /
openapi: 3.1.0
info:
  title: MagicBlock Router API
  description: JSON-RPC API for the MagicBlock Router.
  version: 2.0.0
servers:
  - url: https://devnet-router.magicblock.app
    description: Devnet - RPC Magic Router
  - url: https://router.magicblock.app
    description: Mainnet - RPC Magic Router
security: []
paths:
  /:
    post:
      summary: getBlockhashForAccounts
      description: Get blockhash for multiple account addresses.
      requestBody:
        required: true
        content:
          application/json:
            schema:
              type: object
              properties:
                jsonrpc:
                  type: string
                  enum:
                    - '2.0'
                  default: '2.0'
                id:
                  type: integer
                  default: 1
                method:
                  type: string
                  enum:
                    - getBlockhashForAccounts
                  default: getBlockhashForAccounts
                params:
                  type: array
                  items:
                    type: array
                    items:
                      type: string
                    minItems: 1
                    maxItems: 100
                    description: Array of account addresses (max 100)
                  minItems: 1
                  maxItems: 1
                  description: Single account-address array argument
                  default:
                    - - 7xKXtg2CW87d97TXJSDpbD5jBkheTqA83TZRuJosgAsU
                      - 9WzDXwBbmkg8ZTbNMqUxvQRAyrZzDsGYdLVL9zYtAWWM
              required:
                - jsonrpc
                - id
                - method
                - params
            example:
              jsonrpc: '2.0'
              id: 1
              method: getBlockhashForAccounts
              params:
                - - 7xKXtg2CW87d97TXJSDpbD5jBkheTqA83TZRuJosgAsU
                  - 9WzDXwBbmkg8ZTbNMqUxvQRAyrZzDsGYdLVL9zYtAWWM
      responses:
        '200':
          description: Successful response
          content:
            application/json:
              schema:
                type: object
                properties:
                  jsonrpc:
                    type: string
                    enum:
                      - '2.0'
                    default: '2.0'
                  id:
                    oneOf:
                      - type: integer
                      - type: string
                  result:
                    type: object
                    properties:
                      blockhash:
                        type: string
                        description: The blockhash for the accounts
                      lastValidBlockHeight:
                        type: integer
                        description: The last valid block height
                    required:
                      - blockhash
                      - lastValidBlockHeight
                  error:
                    type: object
                    default: null
              example:
                jsonrpc: '2.0'
                id: 1
                result:
                  blockhash: 9tJWqpCLuFZ8PWQZJaYqydTXzhTCNmrtGraG2wyZXrP7
                  lastValidBlockHeight: 399468682

````