> ## 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.

# Create Instances Bulk

> Creates multiple instance contracts at once by accepting a list of offer (ask) IDs with shared configuration parameters.



## OpenAPI

````yaml /api-reference/openapi.yaml post /api/v0/asks/bulk/
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/asks/bulk/:
    post:
      tags:
        - Instances
      summary: Create Instances Bulk
      description: >-
        Creates multiple instance contracts at once by accepting a list of offer
        (ask) IDs with shared configuration parameters.
      responses:
        '200':
          description: >-
            Returns {success: true, results: [...], created: [contract_ids],
            failed: [ask_ids], elapsed} when at least one instance was created;
            each result item contains {ask_id, success, new_contract, state} or
            {ask_id, success, error, msg} for failures.
          content:
            application/json:
              schema:
                type: object
                properties:
                  success:
                    type: boolean
                    description: True if at least one contract was created
                  results:
                    type: array
                    items:
                      type: object
                      properties:
                        ask_id:
                          type: integer
                          description: The offer ID that was processed
                        success:
                          type: boolean
                          description: True if this offer was accepted
                        new_contract:
                          type: integer
                          description: New instance contract ID (on success)
                        state:
                          type: string
                          description: Container state after creation (on success)
                        error:
                          type: string
                          description: Error code (on failure)
                        msg:
                          type: string
                          description: Error message (on failure)
                    description: Per-offer results
                  created:
                    type: array
                    items:
                      type: integer
                    description: List of successfully created contract IDs
                  failed:
                    type: array
                    items:
                      type: integer
                    description: List of offer IDs that failed
                  elapsed:
                    type: number
                    description: Total elapsed time in seconds
        '400':
          description: >-
            Returns {success: false, error: "invalid_args", msg: "error missings
            offer 'ids' parameter"} when ids is absent, {msg: "no ask ids
            provided"} when list is empty, or {msg: "too many ask ids provided;
            max is 64"} when over the limit; also returned (as HTTPBadRequest)
            when all instances fail.
          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

````