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

# v1 to v2

> If you have been working with the standard v1.1 GET users/show and GET users/lookup, the goal of. Reference for the X API v2 standard tier covering migrate.

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### Standard v1.1 compared to X API v2

If you have been working with the standard v1.1 GET users/show and GET users/lookup, the goal of this guide is to help you understand the similarities and differences between the standard and X API v2 users lookup endpoints.

* **Similarities**
  * OAuth 1.0a User Context
  * Users per request limits
* **Differences**
  * Endpoint URLs
  * App and Project requirements
  * Response data format
  * Request parameters

#### Similarities

**OAuth 1.0a User Context authentication method**

The standard endpoint supports [OAuth 1.0a User Context](/resources/fundamentals/authentication#oauth-1-0a-2), while the new X API v2 users lookup endpoints support both OAuth 1.0a User Context and [App only](/resources/fundamentals/authentication#oauth-2-0). Therefore, if you were previously using one of the standard v1.1 users lookup endpoints, you can continue using the same authentication method if you migrate to the X API v2 version.

Depending on your authentication library/package of choice, App only authentication is probably the easiest way to get started and can be set with a simple request header. To learn how to generate an App only Access Token, see [this App only guide](/resources/fundamentals/authentication#bearer-token-also-known-as-app-only).

**Users per request limits**

The standard v1.1 GET users/lookup endpoint allows you to specify 100 users per request. This also goes for the GET /users and GET /users/by endpoints. To specify a full 100 users, you will need to pass the ids (GET /users) parameter or the username (GET /users/by) parameter as a query parameter, and include the list of user IDs/usernames in a comma-separated list.

#### Differences

**Endpoint URLs**