---
title: "Get typed data for adding a Safe Owner"
method: GET
path: "/api/v1/owners/add/transaction-data"
tags: ["Safe Management"]
---

# Get typed data for adding a Safe Owner

`GET /api/v1/owners/add/transaction-data`

Returns the EIP-712 typed data that needs to be signed by the user's wallet to add a new owner to the Safe.
This endpoint is used as part of a three-step process:
1. Call this endpoint to get the EIP-712 typed data
2. Sign the typed data with the user's wallet using EIP-712 signature standard
3. Submit the signature to the POST `/api/v1/owners` endpoint

## Query parameters

- `newOwner` string, required

## Response `200`

Successfully retrieved EIP-712 typed data for signing.

- object
  - `data` object, required
    - `domain` object, required
      - `verifyingContract` string, required — The contract address that will verify the signature.
      - `chainId` number, required — The chain ID for the network.
    - `primaryType` 'ModuleTx', required — The primary type for EIP-712 typed data signing.
    - `types` object, required
      - `ModuleTx` object[], required — Array of type definitions for the ModuleTx structure.
        - `type` string, required — The field type.
        - `name` string, required — The field name.
    - `message` object, required
      - `data` string, required — The encoded transaction data for adding an owner.
      - `salt` string, required — The salt value for the typed data.

## Other responses

- `401` — Unauthorized - invalid or missing authentication token.
- `404` — Safe account not found for the user.
- `422` — Unprocessable Entity - validation errors in query parameters.
- `500` — Internal server error.

---

[API](https://skmtc.net/gnosispay/apis/gnosispay-api.md) · [All operations](https://skmtc.net/gnosispay/apis/gnosispay-api/llms.txt) · [OpenAPI document](https://skmtc-service-staging.skmtc.workers.dev/v1/apis/gnosispay/gnosispay-api/versions/e0a09962c187/schema)