> ## Documentation Index
> Fetch the complete documentation index at: https://docs.heify.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Create Participant

> Create a new participant profile to track a person across transcriptions — a support agent, job candidate, salesperson, or any individual.

<Info>
  For the full Participant data model, see [Participant](/core/participant).
</Info>

<Note>
  `tag` is trimmed of leading and trailing whitespace automatically.
</Note>

<Note>
  `metadata` values are always stored as strings, regardless of the input type. See [Participant — metadata](/core/participant#metadata).
</Note>

<Note>
  Each account is limited to **200 participants**. Returns `400` if the limit is reached.
</Note>


## OpenAPI

````yaml api-reference/openapi-participants.json POST /create-participant
openapi: 3.1.0
info:
  title: Heify API — Participants
  description: Endpoints for creating, retrieving, and managing Participants.
  version: 1.0.0
servers:
  - url: https://api.heify.com
security:
  - apiKeyAuth: []
paths:
  /create-participant:
    post:
      summary: Create Participant
      description: Creates a new participant profile for the authenticated account.
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/CreateParticipantRequest'
            examples:
              WithMetadata:
                summary: Create participant with metadata
                value:
                  tag: juan pedro
                  metadata:
                    role: manager
                    language: español
                    empresa: leroy
              TagOnly:
                summary: Create participant with tag only
                value:
                  tag: Maria García
      responses:
        '201':
          description: Participant created successfully.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/CreateParticipantResponse'
              examples:
                Success:
                  summary: Participant created
                  value:
                    data:
                      message: Participant created successfully
                      participant:
                        participant_id: 1f77a5f5-ac38-42c6-999d-45f02d11d121
                        tag: juan pedro
                        metadata:
                          role: manager
                          language: español
                          empresa: leroy
                        created_at: '2026-03-21T13:23:18.069124+00:00'
                        updated_at: '2026-03-21T13:23:18.088360+00:00'
components:
  schemas:
    CreateParticipantRequest:
      type: object
      properties:
        tag:
          type: string
          description: >-
            Label for this participant. Max 100 characters. Leading and trailing
            whitespace is stripped automatically.
        metadata:
          type: object
          nullable: true
          description: >-
            Optional key-value pairs. Max 10 keys; keys ≤50 characters, values
            ≤250 characters. All values are stored as strings regardless of
            input type.
      required:
        - tag
    CreateParticipantResponse:
      type: object
      properties:
        data:
          type: object
          properties:
            message:
              type: string
            participant:
              $ref: '#/components/schemas/ParticipantObject'
    ParticipantObject:
      type: object
      properties:
        participant_id:
          type: string
          format: uuid
          description: Unique identifier for this participant.
        tag:
          type: string
          description: Human-readable label for this participant. Max 100 characters.
        metadata:
          type: object
          nullable: true
          description: >-
            Arbitrary key-value pairs. All values are stored as strings. Max 10
            keys; key names max 50 characters; values max 250 characters.
        created_at:
          type: string
          format: date-time
          description: Creation timestamp (ISO 8601).
        updated_at:
          type: string
          format: date-time
          description: Last updated timestamp (ISO 8601).
      required:
        - participant_id
        - tag
        - created_at
        - updated_at
  securitySchemes:
    apiKeyAuth:
      type: apiKey
      in: header
      name: x-api-key

````