openapi: 3.0.3
info:
  title: Chainstack Arbitrum Node Account Info State API
  version: 1.0.0
  description: Chainstack-managed RPC node API for the Arbitrum blockchain. Endpoints follow the canonical JSON-RPC over HTTPS interface for the network. Authenticate against your Chainstack node's per-node URL (e.g. https://nd-XXX-XXX-XXX.p2pify.com/<key>). Merged from the Chainstack Developer Portal per-method fragments at https://github.com/chainstack/dev-portal/tree/main/openapi/arbitrum_node_api.
  contact:
    name: Chainstack API Support
    email: support@chainstack.com
  license:
    name: Chainstack Terms
    url: https://chainstack.com/terms-of-service/
servers:
- url: https://{node_id}.p2pify.com/{api_key}
  description: Chainstack-managed node endpoint
  variables:
    node_id:
      default: nd-000-000-000
      description: Your Chainstack node identifier
    api_key:
      default: <api-key>
      description: Per-node access key
tags:
- name: State
paths:
  /getBeaconBlockRootByBlockId:
    get:
      summary: Get the root of the beacon block by block_id
      operationId: getBeaconBlockRootByBlockId
      parameters:
      - name: block_id
        in: path
        description: Block identifier, e.g., 'head', 'genesis', 'finalized', or a specific block root.
        required: true
        schema:
          type: string
          default: head
      responses:
        '200':
          description: Beacon block root successfully retrieved
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/BeaconBlockRootItem'
        '404':
          description: Beacon block root not found
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
        '500':
          description: Internal server error
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
      tags:
      - State
  /getBeaconBlocksByBlockId:
    get:
      summary: Get beacon blocks by block_id
      operationId: getBeaconBlocksByBlockId
      parameters:
      - name: block_id
        in: path
        description: Block identifier, e.g., 'head', 'genesis', 'finalized', or a specific block root.
        required: true
        schema:
          type: string
          default: head
      responses:
        '200':
          description: Beacon block successfully retrieved
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/BeaconBlockItem'
        '404':
          description: Beacon block not found
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
        '500':
          description: Internal server error
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
      tags:
      - State
  /getBeaconHeadersByBlockId:
    get:
      summary: Get beacon headers by block_id
      operationId: getBeaconHeadersByBlockId
      parameters:
      - name: block_id
        in: path
        description: Block identifier, e.g., 'head', 'genesis', 'finalized', or a specific block root.
        required: true
        schema:
          type: string
          default: head
      responses:
        '200':
          description: Beacon header successfully retrieved
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/BeaconHeaderItem'
        '404':
          description: Beacon header not found
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
        '500':
          description: Internal server error
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
      tags:
      - State
  /getBeaconHeadersBySlotAndParentRoot:
    get:
      summary: Get beacon headers by slot and parent root
      operationId: getBeaconHeadersBySlotAndParentRoot
      parameters:
      - name: slot
        in: query
        description: Slot number
        required: false
        schema:
          type: integer
          format: int64
          default: 6215071
      - name: parent_root
        in: query
        description: Parent root hash
        required: false
        schema:
          type: string
          format: byte
      responses:
        '200':
          description: Beacon headers successfully retrieved
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/BeaconHeaders'
        '404':
          description: Beacon headers not found
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
        '500':
          description: Internal server error
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
      tags:
      - State
  /getBlobsByBlockId:
    get:
      summary: Get blobs by block_id
      operationId: getBlobsByBlockId
      parameters:
      - name: block_id
        in: path
        description: Block identifier, e.g., 'head', 'genesis', 'finalized', or a specific slot number.
        required: true
        schema:
          type: string
          default: head
      responses:
        '200':
          description: Blobs successfully retrieved
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/BlobsResponse'
        '404':
          description: Block not found
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
        '500':
          description: Internal server error
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
      tags:
      - State
  /getCommitteesByStateIdEpochIndexAndSlot:
    get:
      summary: Get committees by state, epoch, index, and slot
      operationId: getCommitteesByStateIdEpochIndexAndSlot
      parameters:
      - name: state_id
        in: path
        description: State identifier, e.g., 'head', 'finalized', 'genesis', or a specific slot number.
        required: true
        schema:
          type: string
          default: head
      - name: epoch
        in: query
        description: Epoch number
        required: false
        schema:
          type: integer
          format: int64
          example: 194213
      - name: index
        in: query
        description: Committee index
        required: false
        schema:
          type: integer
          format: int64
          example: 1
      - name: slot
        in: query
        description: Slot number
        required: false
        schema:
          type: integer
          format: int64
      responses:
        '200':
          description: Committee data successfully retrieved
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/CommitteeData'
        '404':
          description: Committee data not found
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
        '500':
          description: Internal server error
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
      tags:
      - State
  /getFinalityCheckpoints:
    get:
      summary: Get finality checkpoints for a given state
      operationId: getFinalityCheckpoints
      tags:
      - State
      parameters:
      - name: state_id
        in: path
        required: true
        description: State identifier which can be a slot number, an epoch number, a block root, or 'genesis', 'head'  (default is 'head').
        schema:
          type: string
          default: head
      responses:
        '200':
          description: Successful response with finality checkpoints information
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/FinalityCheckpoints'
        '400':
          description: Invalid request
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
  /getStateRoot:
    get:
      summary: Get the root of a given state
      operationId: getStateRoot
      tags:
      - State
      parameters:
      - name: state_id
        in: path
        required: true
        description: State identifier which can be a slot number, an epoch number, a block root, or 'genesis', 'head'  (default is 'head').
        schema:
          type: string
          default: head
      responses:
        '200':
          description: Successful response with state root information
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/StateRoot'
        '400':
          description: Invalid request
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
  /getSyncCommitteeContribution:
    get:
      summary: Get sync committee contribution for a given slot, subcommittee index, and beacon block root
      operationId: getSyncCommitteeContribution
      parameters:
      - name: slot
        in: query
        description: Slot for which to retrieve the sync committee contribution
        required: true
        schema:
          type: integer
          format: int64
          default: 6244671
      - name: subcommittee_index
        in: query
        description: Subcommittee index for which to retrieve the sync committee contribution
        required: true
        schema:
          type: integer
          format: int64
          default: 1
      - name: beacon_block_root
        in: query
        description: Beacon block root for which to retrieve the sync committee contribution
        required: true
        schema:
          type: string
          pattern: ^0x[0-9a-fA-F]+$
          default: '0x19708d7b686e2654656690f3262ff3686b810966839117ae8affd0e757b17544'
      responses:
        '200':
          description: Sync committee contribution successfully retrieved
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/SyncCommitteeContribution'
        '400':
          description: Invalid request
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
        '500':
          description: Internal server error
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
      tags:
      - State
  /getSyncCommitteesByStateIdAndEpoch:
    get:
      summary: Get sync committees by state and epoch
      operationId: getSyncCommitteesByStateIdAndEpoch
      parameters:
      - name: state_id
        in: path
        description: State identifier, e.g., 'head', 'finalized', 'genesis', or a specific slot number.
        required: true
        schema:
          type: string
          default: head
      - name: epoch
        in: query
        description: Epoch number
        required: false
        schema:
          type: integer
          format: int64
          example: 194213
      responses:
        '200':
          description: Sync committee data successfully retrieved
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/SyncCommitteeData'
        '404':
          description: Sync committee data not found
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
        '500':
          description: Internal server error
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
      tags:
      - State
components:
  schemas:
    FinalityCheckpoints:
      type: object
      properties:
        previous_justified:
          type: object
          properties:
            epoch:
              type: integer
              description: Epoch number of the previous justified checkpoint.
            root:
              type: string
              format: byte
              description: Root of the previous justified checkpoint.
        current_justified:
          type: object
          properties:
            epoch:
              type: integer
              description: Epoch number of the current justified checkpoint.
            root:
              type: string
              format: byte
              description: Root of the current justified checkpoint.
        finalized:
          type: object
          properties:
            epoch:
              type: integer
              description: Epoch number of the finalized checkpoint.
            root:
              type: string
              format: byte
              description: Root of the finalized checkpoint.
    Block:
      type: object
      properties:
        slot:
          type: integer
          format: int64
        parent_root:
          type: string
        state_root:
          type: string
        body:
          type: object
      required:
      - slot
      - parent_root
      - state_root
      - body
    SyncCommitteeContribution:
      type: object
      properties:
        slot:
          type: integer
          format: int64
        beacon_block_root:
          type: string
          pattern: ^0x[0-9a-fA-F]+$
        subcommittee_index:
          type: integer
          format: int64
        aggregation_bits:
          type: string
          pattern: ^0x[0-9a-fA-F]+$
        signature:
          type: string
          pattern: ^0x[0-9a-fA-F]+$
      required:
      - slot
      - beacon_block_root
      - subcommittee_index
      - aggregation_bits
      - signature
    BeaconHeaders:
      type: object
      properties:
        data:
          type: array
          items:
            $ref: '#/components/schemas/BeaconHeader'
      required:
      - data
    BlobItem:
      type: object
      properties:
        index:
          type: string
        blob:
          type: string
        kzg_commitment:
          type: string
        kzg_proof:
          type: string
        signed_block_header:
          type: object
      required:
      - index
      - blob
      - kzg_commitment
      - kzg_proof
    CommitteeData:
      type: object
      properties:
        data:
          type: array
          items:
            $ref: '#/components/schemas/CommitteeItem'
      required:
      - data
    BeaconBlockItem:
      type: object
      properties:
        root:
          type: string
        block:
          $ref: '#/components/schemas/Block'
      required:
      - root
      - block
    StateRoot:
      type: object
      properties:
        root:
          type: string
          format: byte
          description: The root of the specified state.
    BeaconHeader:
      type: object
      properties:
        root:
          type: string
        canonical:
          type: boolean
        header:
          $ref: '#/components/schemas/Header'
      required:
      - root
      - canonical
      - header
    BlobsResponse:
      type: object
      properties:
        data:
          type: array
          items:
            $ref: '#/components/schemas/BlobItem'
      required:
      - data
    Error:
      type: object
      properties:
        code:
          type: integer
          format: int32
        message:
          type: string
      required:
      - code
      - message
    SyncCommitteeData:
      type: object
      properties:
        data:
          $ref: '#/components/schemas/SyncCommittee'
      required:
      - data
    Header:
      type: object
      properties:
        slot:
          type: integer
          format: int64
        parent_root:
          type: string
        state_root:
          type: string
        body_root:
          type: string
      required:
      - slot
      - parent_root
      - state_root
      - body_root
    SyncCommittee:
      type: object
      properties:
        validators:
          type: array
          items:
            type: integer
            format: int64
        validator_aggregates:
          type: string
      required:
      - validators
      - validator_aggregates
    BeaconHeaderItem:
      type: object
      properties:
        root:
          type: string
        canonical:
          type: boolean
        header:
          $ref: '#/components/schemas/Header'
      required:
      - root
      - canonical
      - header
    CommitteeItem:
      type: object
      properties:
        index:
          type: integer
          format: int64
        slot:
          type: integer
          format: int64
        validators:
          type: array
          items:
            type: integer
            format: int64
      required:
      - index
      - slot
      - validators
    BeaconBlockRootItem:
      type: object
      properties:
        root:
          type: string
      required:
      - root