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

# Add or remove a signing key on your wallet

> Returns the Safe call authorising another address to sign for your wallet (or removing one, with `remove: true`). Sign it with your passkey and relay it — nothing changes until you do. An added key is a full owner: it can place orders, withdraw, redeem, and remove your passkey. Adding a key you already added returns no calls.



## OpenAPI

````yaml /api-reference/openapi/calibri.yaml post /api/v2/atlas/account/wallet/owners
openapi: 3.1.0
info:
  title: Calibri API
  version: 1.0.0
  description: >-
    The Calibri API. Discover markets, read live books, place signed orders, and
    manage positions and account data.

    Routed by path prefix to the service that answers it — which is an
    implementation detail, not something a caller has to reason about.
servers:
  - description: Production
    url: https://calibri.io
security: []
tags:
  - name: Health
    description: Service liveness.
    x-displayName: Health
  - name: Events
    description: Discover events and their metadata.
    x-displayName: Events
  - name: Markets
    description: List markets and load market detail for trading.
    x-displayName: Markets
  - name: Series
    description: Recurring event series.
    x-displayName: Series
  - name: Tags
    description: Editorial shelves used to browse the catalogue.
    x-displayName: Tags
  - name: Market Data
    description: Order book, depth, trade tape, tickers, and candles.
    x-displayName: Market Data
  - name: Assets
    description: Underlying asset price history for price-feed markets.
    x-displayName: Assets
  - name: Community
    description: Leaderboard and platform activity.
    x-displayName: Community
  - name: Currencies
    description: Currency registry.
    x-displayName: Currencies
  - name: Trade
    description: Place, list, and cancel orders.
    x-displayName: Trade
  - name: Positions
    description: Your matched contracts.
    x-displayName: Positions
  - name: Wallet
    description: Self-custody Safe, passkey, session keys, and relay.
    x-displayName: Wallet
  - name: Rewards
    description: Maker rebates and referral earnings.
    x-displayName: Rewards
  - name: Account
    description: Balances, ledger, PnL, limits, preferences, and profile.
    x-displayName: Account
  - name: Categories
    description: Categories
    x-displayName: Categories
  - name: Other
    description: Other
    x-displayName: Other
externalDocs:
  description: ''
  url: ''
paths:
  /api/v2/atlas/account/wallet/owners:
    post:
      tags:
        - Wallet
      summary: Add or remove a signing key on your wallet
      description: >-
        Returns the Safe call authorising another address to sign for your
        wallet (or removing one, with `remove: true`). Sign it with your passkey
        and relay it — nothing changes until you do. An added key is a full
        owner: it can place orders, withdraw, redeem, and remove your passkey.
        Adding a key you already added returns no calls.
      parameters: []
      requestBody:
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/SafeOwnerRequest'
      responses:
        '200':
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/SafeOwnerPrepareEntity'
          description: ''
      security:
        - apiKey: []
components:
  schemas:
    SafeOwnerRequest:
      properties:
        otp:
          description: >-
            Your six-digit two-factor code. REQUIRED when adding a key — a key
            that can withdraw and replace your passkey is not something a
            hijacked session should be able to grant. Not needed to remove one.
          example: '123456'
          type: string
        owner:
          description: The address to authorise (or, with `remove`, to revoke).
          example: '0x1631794cb5841002a7feaf0cc064a228c0db8e94'
          type: string
        remove:
          description: >-
            Set to remove this key instead of adding it. Your own passkey cannot
            be removed this way.
          example: false
          type: boolean
      required:
        - owner
      type: object
    SafeOwnerPrepareEntity:
      properties:
        calls:
          description: >-
            The Safe call(s) to sign with your passkey and relay. EMPTY when the
            request is already satisfied — adding an address that already signs
            for the wallet changes nothing.
          items:
            $ref: '#/components/schemas/SafeSetupCallEntity'
          type: array
        owners:
          description: The owner set as it stands, before this change.
          items:
            type: string
          type: array
        safe:
          description: Your wallet (Safe) address.
          example: 0x2b01…E22a
          type: string
      required:
        - safe
        - owners
        - calls
      type: object
    SafeSetupCallEntity:
      properties:
        data:
          description: ABI-encoded calldata.
          example: 0x095ea7b3…
          type: string
        hash:
          description: The SafeTx hash to sign.
          example: 0x9ab1…
          type: string
        nonce:
          description: The Safe's nonce for this call. Relay in order.
          example: 4
          type: number
        operation:
          description: '`0` = CALL, `1` = DELEGATECALL (a MultiSend batch).'
          example: 0
          type: number
        to:
          description: Target contract.
          example: '0x3c499c542cEF5E3811e1192ce70d8cC03d5c3359'
          type: string
      required:
        - to
        - data
        - operation
        - nonce
        - hash
      type: object
  securitySchemes:
    apiKey:
      description: >-
        HMAC-signed API key. Send X-Auth-Apikey, X-Auth-Nonce and
        X-Auth-Signature.
      in: header
      name: X-Auth-Apikey
      type: apiKey

````

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