> ## Documentation Index
> Fetch the complete documentation index at: https://vastai-80aa3a82-auto-openapi-update-8483c1e9.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# Update Instances Bulk

> Changes the state (running/stopped) or label of multiple instances by ID in a single request.



## OpenAPI

````yaml /api-reference/openapi.yaml put /api/v0/instances/
openapi: 3.1.0
info:
  title: Vast.ai API
  description: >-
    Vast.ai REST API for managing GPU cloud instances, machine operations, and
    AI/ML workflows.


    ## AI Agent Quick-Start


    Install the CLI skill for your agent (Claude Code, Cursor, Windsurf, etc.):
      npx skills add vast-ai/vast-cli

    CLI reference:
    https://raw.githubusercontent.com/vast-ai/vast-cli/master/vastai/SKILL.md

    SDK reference:
    https://raw.githubusercontent.com/vast-ai/vast-cli/master/vastai_sdk/SKILL.md


    ## Auth

    All endpoints require `Authorization: Bearer $VAST_API_KEY`.

    Get your key at: https://cloud.vast.ai/manage-keys/


    ## Key Quirks

    - `gpu_ram` in CLI = GB; in REST API = MB (CLI auto-converts)

    - SSH keys must be registered BEFORE creating an instance (VM: no recovery;
    Docker: can add post-create)

    - `onstart` field is limited to 4048 characters -- gzip+base64 for longer
    scripts

    - `POST /api/v0/asks/{id}/` (create instance) returns `new_contract` as the
    instance ID, not `id`

    - Poll trap: if `actual_status` becomes `exited`, `unknown`, or `offline` it
    will never reach `running` -- destroy and retry
  version: 1.0.0
  contact:
    name: Vast.ai Support
    url: https://discord.gg/vast
servers:
  - url: https://console.vast.ai
    description: Production server
security:
  - BearerAuth: []
paths:
  /api/v0/instances/:
    put:
      tags:
        - Instances
      summary: Update Instances Bulk
      description: >-
        Changes the state (running/stopped) or label of multiple instances by ID
        in a single request.
      requestBody:
        content:
          application/json:
            schema:
              type: object
              properties:
                ids:
                  type: array
                  description: >-
                    List of instance contract IDs to update; maximum 64 IDs per
                    request.
                  example:
                    - 12345
                    - 12346
                state:
                  type: string
                  description: Target state to set for all specified instances.
                  enum:
                    - running
                    - stopped
      responses:
        '200':
          description: 'Returns {success: true} when at least one instance was updated.'
          content:
            application/json:
              schema:
                type: object
                properties:
                  success:
                    type: boolean
                    description: True when update succeeded
              example:
                success: true
        '400':
          description: >-
            Returns {error: "invalid_args", msg: "ids list required"} when no
            ids provided, {error: "invalid_args", msg: "chunk length of N > 64"}
            when too many IDs, or {error: "insufficient_credit", msg: "You lack
            credit."} for billing issues.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
        '404':
          description: >-
            Returns {error: "invalid_args", msg: "Invalid instance ID list
            ids."} when no matching instances found.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
      security:
        - BearerAuth: []
components:
  schemas:
    Error:
      type: object
      properties:
        error:
          type: string
        msg:
          type: string
  securitySchemes:
    BearerAuth:
      type: http
      scheme: bearer
      description: API key must be provided in the Authorization header

````