> ## 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 2FA Method

> Updates a 2FA method's label or primary status for the authenticated user.



## OpenAPI

````yaml /api-reference/openapi.yaml put /api/v0/tfa/update/
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/tfa/update/:
    put:
      tags:
        - Accounts
      summary: Update 2FA Method
      description: >-
        Updates a 2FA method's label or primary status for the authenticated
        user.
      requestBody:
        content:
          application/json:
            schema:
              type: object
              properties:
                tfa_method_id:
                  type: integer
                  description: >-
                    ID of the 2FA method to update; preferred over tfa_method
                    when multiple methods of the same type exist
                  example: 3
                tfa_method:
                  type: string
                  description: >-
                    Method type to update; used when tfa_method_id is not
                    provided
                  example: sms
                  enum:
                    - sms
                    - totp
                label:
                  type: string
                  description: >-
                    User-friendly name for this method (max 30 characters), e.g.
                    'Work Phone'
                  example: Work Phone
                is_primary:
                  type: boolean
                  description: >-
                    Set to true to make this the preferred default method; set
                    to false to unset it
                  example: true
      responses:
        '200':
          description: >-
            Returns {success: true, msg: "2FA method updated", method: {...}}
            with updated method info (phone masked, TOTP secret redacted).
          content:
            application/json:
              schema:
                type: object
                properties:
                  success:
                    type: boolean
                    description: Always true on success
                  msg:
                    type: string
                    description: '"2FA method updated"'
                  method:
                    type: object
                    description: >-
                      Updated 2FA method record with phone number masked and
                      TOTP secret redacted
              example:
                success: true
                msg: 2FA method updated
                method:
                  id: 3
                  method: sms
                  label: Work Phone
                  is_primary: true
                  phone_number: '******5678'
                  totp_secret: null
        '400':
          description: >-
            No update parameters provided ("invalid_params"), email 2FA cannot
            be updated, label too long (max 30 chars), is_primary must be
            boolean, no changes made, or at least one method must remain
            primary.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
        '401':
          description: User is not authenticated.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
        '403':
          description: >-
            Team user attempting 2FA action in team context
            ("team_user_forbidden").
          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

````