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

# Create or update a contact by email

> Requires the `contacts:write` scope.



## OpenAPI

````yaml /api-reference/openapi.json post /contacts
openapi: 3.1.0
info:
  title: Darwin API
  version: '2026-10-12'
  description: >-
    Read and act on your Darwin workspace: conversations, contacts, meetings,
    analytics, knowledge, the agent and its opening tests, with signed webhooks
    for what happens.


    Authenticate with a secret key from Integrations → API: `Authorization:
    Bearer dk_live_…`. Keys carry scopes; personal data needs `contacts:read`.

    Rate limits are per key per minute: origin 120, adapt 120, evolve 600, apex
    1200; heavy calls (exports, crawls, model work) have a smaller budget. Every
    response carries RateLimit-* headers.

    Lists are cursor-paginated (`limit`, `starting_after`, `next_cursor`).
    Writes accept `Idempotency-Key`. Errors are RFC 9457 problem documents with
    a stable `code` and a `request_id`.
  contact:
    name: Darwin
    url: https://docs.meetdarwin.ai/api-reference/introduction
servers:
  - url: https://api.meetdarwin.ai/v1
security:
  - bearer: []
tags:
  - name: Workspace
  - name: Conversations
  - name: Contacts
  - name: Meetings
  - name: Analytics
  - name: Events
  - name: Webhooks
  - name: Knowledge
  - name: Agent
  - name: Experiments
  - name: Privacy
  - name: Chat
paths:
  /contacts:
    post:
      tags:
        - Contacts
      summary: Create or update a contact by email
      description: Requires the `contacts:write` scope.
      operationId: upsertContact
      parameters:
        - name: Idempotency-Key
          in: header
          required: false
          description: >-
            Retry safely: the first response is replayed for 24 hours (not for
            streamed answers).
          schema:
            type: string
            maxLength: 255
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/ContactCreate'
      responses:
        '200':
          description: The contact existed and was updated.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Contact'
        '201':
          description: OK
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Contact'
        '400':
          description: Invalid request (`invalid_request`, `unsupported_version`).
          content:
            application/problem+json:
              schema:
                $ref: '#/components/schemas/Problem'
        '401':
          description: >-
            Missing or invalid key (`authentication_required`,
            `invalid_api_key`).
          content:
            application/problem+json:
              schema:
                $ref: '#/components/schemas/Problem'
        '402':
          description: >-
            The workspace must add a card before the API can be used
            (`payment_required`).
          content:
            application/problem+json:
              schema:
                $ref: '#/components/schemas/Problem'
        '403':
          description: The key lacks the scope (`insufficient_scope`).
          content:
            application/problem+json:
              schema:
                $ref: '#/components/schemas/Problem'
        '404':
          description: No such object in this workspace (`not_found`).
          content:
            application/problem+json:
              schema:
                $ref: '#/components/schemas/Problem'
        '409':
          description: >-
            Conflicts with the current state (`conflict`,
            `idempotency_key_in_use`).
          content:
            application/problem+json:
              schema:
                $ref: '#/components/schemas/Problem'
        '422':
          description: Refused by a rule (`unprocessable`, `idempotency_key_reused`).
          content:
            application/problem+json:
              schema:
                $ref: '#/components/schemas/Problem'
        '429':
          description: >-
            Rate limited (`rate_limited`) or a monthly allowance used
            (`quota_exceeded`); see Retry-After.
          content:
            application/problem+json:
              schema:
                $ref: '#/components/schemas/Problem'
components:
  schemas:
    ContactCreate:
      type: object
      properties:
        email:
          type: string
          minLength: 3
          maxLength: 320
        first_name:
          anyOf:
            - type: string
              maxLength: 120
            - type: 'null'
        last_name:
          anyOf:
            - type: string
              maxLength: 120
            - type: 'null'
        company:
          anyOf:
            - type: string
              maxLength: 200
            - type: 'null'
        phone:
          anyOf:
            - type: string
              maxLength: 40
            - type: 'null'
        external_id:
          anyOf:
            - type: string
              maxLength: 200
            - type: 'null'
        attributes:
          type: object
          propertyNames:
            type: string
          additionalProperties: {}
      required:
        - email
      additionalProperties: false
    Contact:
      type: object
      properties:
        id:
          type: string
          pattern: ^ct_
          example: ct_4f8k2m9q1x7z3c5v
        object:
          type: string
          const: contact
        email:
          type: string
        first_name:
          type:
            - string
            - 'null'
        last_name:
          type:
            - string
            - 'null'
        name:
          type:
            - string
            - 'null'
        company:
          type:
            - string
            - 'null'
        phone:
          type:
            - string
            - 'null'
        external_id:
          description: Your own id for this person (a CRM record id). Unique per workspace.
          type:
            - string
            - 'null'
        attributes:
          type: object
          propertyNames:
            type: string
          additionalProperties:
            type:
              - string
              - number
              - boolean
              - 'null'
        identity_verified:
          type: boolean
        source:
          type: string
        first_seen_at:
          anyOf:
            - type: string
              format: date-time
              pattern: >-
                ^(?:(?:\d\d[2468][048]|\d\d[13579][26]|\d\d0[48]|[02468][048]00|[13579][26]00)-02-29|\d{4}-(?:(?:0[13578]|1[02])-(?:0[1-9]|[12]\d|3[01])|(?:0[469]|11)-(?:0[1-9]|[12]\d|30)|(?:02)-(?:0[1-9]|1\d|2[0-8])))T(?:(?:[01]\d|2[0-3]):[0-5]\d:[0-5]\d(?:\.\d+)?(?:Z|([+-](?:[01]\d|2[0-3]):[0-5]\d)))$
            - type: 'null'
        last_seen_at:
          anyOf:
            - type: string
              format: date-time
              pattern: >-
                ^(?:(?:\d\d[2468][048]|\d\d[13579][26]|\d\d0[48]|[02468][048]00|[13579][26]00)-02-29|\d{4}-(?:(?:0[13578]|1[02])-(?:0[1-9]|[12]\d|3[01])|(?:0[469]|11)-(?:0[1-9]|[12]\d|30)|(?:02)-(?:0[1-9]|1\d|2[0-8])))T(?:(?:[01]\d|2[0-3]):[0-5]\d:[0-5]\d(?:\.\d+)?(?:Z|([+-](?:[01]\d|2[0-3]):[0-5]\d)))$
            - type: 'null'
        created_at:
          anyOf:
            - type: string
              format: date-time
              pattern: >-
                ^(?:(?:\d\d[2468][048]|\d\d[13579][26]|\d\d0[48]|[02468][048]00|[13579][26]00)-02-29|\d{4}-(?:(?:0[13578]|1[02])-(?:0[1-9]|[12]\d|3[01])|(?:0[469]|11)-(?:0[1-9]|[12]\d|30)|(?:02)-(?:0[1-9]|1\d|2[0-8])))T(?:(?:[01]\d|2[0-3]):[0-5]\d:[0-5]\d(?:\.\d+)?(?:Z|([+-](?:[01]\d|2[0-3]):[0-5]\d)))$
            - type: 'null'
        updated_at:
          anyOf:
            - type: string
              format: date-time
              pattern: >-
                ^(?:(?:\d\d[2468][048]|\d\d[13579][26]|\d\d0[48]|[02468][048]00|[13579][26]00)-02-29|\d{4}-(?:(?:0[13578]|1[02])-(?:0[1-9]|[12]\d|3[01])|(?:0[469]|11)-(?:0[1-9]|[12]\d|30)|(?:02)-(?:0[1-9]|1\d|2[0-8])))T(?:(?:[01]\d|2[0-3]):[0-5]\d:[0-5]\d(?:\.\d+)?(?:Z|([+-](?:[01]\d|2[0-3]):[0-5]\d)))$
            - type: 'null'
        conversation_count:
          type: integer
          minimum: -9007199254740991
          maximum: 9007199254740991
        meeting_count:
          type: integer
          minimum: -9007199254740991
          maximum: 9007199254740991
      required:
        - id
        - object
        - email
        - first_name
        - last_name
        - name
        - company
        - phone
        - external_id
        - attributes
        - identity_verified
        - source
        - first_seen_at
        - last_seen_at
        - created_at
        - updated_at
    Problem:
      type: object
      properties:
        type:
          type: string
          example: https://docs.meetdarwin.ai/api-reference/errors#insufficient_scope
        title:
          type: string
        status:
          type: integer
          minimum: -9007199254740991
          maximum: 9007199254740991
        code:
          type: string
          example: insufficient_scope
        detail:
          type: string
        param:
          type: string
        request_id:
          type: string
          example: req_8m2k4p0q1x7z9c3v5b6n
      required:
        - type
        - title
        - status
        - code
        - detail
        - request_id
  securitySchemes:
    bearer:
      type: http
      scheme: bearer
      description: >-
        A secret key (dk_live_…). Scopes: conversations:read, contacts:read,
        contacts:write, meetings:read, analytics:read, events:read,
        webhooks:write, knowledge:read, knowledge:write, agent:read,
        agent:write, experiments:read, experiments:write, privacy:write,
        chat:write.

````

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