> ## Documentation Index
> Fetch the complete documentation index at: https://vastai-80aa3a82-auto-openapi-preview-pr-5002.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# Send 2FA Email Code

> Sends a 6-digit 2FA verification code to the user's verified email address.



## OpenAPI

````yaml /api-reference/openapi.yaml post /api/v0/tfa/email
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
  license:
    name: Vast.ai Terms of Service
    url: https://vast.ai/terms/
servers:
  - url: https://console.vast.ai
    description: Production server
security:
  - BearerAuth: []
paths:
  /api/v0/tfa/email:
    post:
      tags:
        - Accounts
      summary: Send 2FA Email Code
      description: >-
        Sends a 6-digit 2FA verification code to the user's verified email
        address.
      operationId: send2FAEmailCode
      requestBody:
        content:
          application/json:
            schema:
              type: object
              properties:
                secret:
                  type: string
                  description: >-
                    Existing tfa_secret to reuse when refreshing a code during
                    an active login challenge; omit to generate a new secret
                  example: abc123secret
      responses:
        '200':
          description: >-
            Returns {success: true, msg: "2FA code sent to your email address.",
            secret} where secret is used to verify the code.
          content:
            application/json:
              schema:
                type: object
                properties:
                  success:
                    type: boolean
                    description: Always true on success
                  msg:
                    type: string
                    description: Confirmation message
                  secret:
                    type: string
                    description: >-
                      TFA secret token to include in the subsequent verification
                      request
              example:
                success: true
                msg: 2FA code sent to your email address.
                secret: abc123randomtoken
        '400':
          description: >-
            No email associated with account ("missing_email"), email not
            verified ("email_not_verified"), or a recent code was already sent
            ("tfa_challenge_exists").
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
        '401':
          description: Missing 2FA secret or bearer token ("missing_auth_value").
          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

````