> ## 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.

# Resend 2FA SMS Code

> Resends a 2FA SMS verification code to the same phone number as the existing challenge.



## OpenAPI

````yaml /api-reference/openapi.yaml post /api/v0/tfa/sms/resend/
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/sms/resend/:
    post:
      tags:
        - Accounts
      summary: Resend 2FA SMS Code
      description: >-
        Resends a 2FA SMS verification code to the same phone number as the
        existing challenge.
      requestBody:
        content:
          application/json:
            schema:
              type: object
              properties:
                secret:
                  type: string
                  description: >-
                    The tfa_secret from the original send; required unless the
                    user is authenticated via bearer token
                  example: abc123secret
                phone_number:
                  type: string
                  description: >-
                    Phone number associated with the original challenge; must
                    match the number the code was first sent to
                  example: '+14155550123'
                tfa_method_id:
                  type: integer
                  description: >-
                    ID of the SMS 2FA method to resend to; phone number is taken
                    from the stored method
                  example: 3
      responses:
        '200':
          description: 'Returns {msg: "A 6-digit code has been sent to your phone", secret}.'
          content:
            application/json:
              schema:
                type: object
                properties:
                  msg:
                    type: string
                    description: '"A 6-digit code has been sent to your phone"'
                  secret:
                    type: string
                    description: >-
                      The TFA secret (original or newly issued) to use in the
                      verification request
              example:
                msg: A 6-digit code has been sent to your phone
                secret: abc123randomtoken
        '400':
          description: >-
            Email not verified ("email_not_verified"), no existing challenge
            found ("no_challenge_found"), no secret or phone provided
            ("invalid_params"), phone number mismatch ("phone_number_mismatch"),
            or Twilio error ("twilio_error").
          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'
        '403':
          description: SMS sending disabled due to fraud ("sms_fraud_detected").
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
        '429':
          description: Too many SMS attempts ("sms_rate_limited" or "preauth_phone_cap").
          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

````