get-api-key changedget-api-key
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4242export ANTHROPIC_API_KEY="sk-ant-api03-..."
4343```
4444
45The [client SDK](https://platform.claude.com/docs/en/cli-sdks-libraries/overview) reads `ANTHROPIC_API_KEY` automatically. Direct HTTP requests send the key in the `x-api-key` header. If your API key works on multiple workspaces, you must also send the `anthropic-workspace-id` header on each Claude API request, as shown in [Select a workspace](https://platform.claude.com/docs/en/manage-claude/authentication#select-a-workspace). For the Admin API, see [API keys and the Admin API](https://platform.claude.com/docs/en/get-api-key#api-keys-and-the-admin-api).
45The [client SDK](https://platform.claude.com/docs/en/cli-sdks-libraries/overview) reads `ANTHROPIC_API_KEY` automatically. Direct HTTP requests send the key as `Authorization: Bearer <key>`. If your API key works on multiple workspaces, you must also send the `anthropic-workspace-id` header on each Claude API request, as shown in [Select a workspace](https://platform.claude.com/docs/en/manage-claude/authentication#select-a-workspace). For the Admin API, see [API keys and the Admin API](https://platform.claude.com/docs/en/get-api-key#api-keys-and-the-admin-api).
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4747To make your first request, follow the [Quickstart](https://platform.claude.com/docs/en/get-started), and see [Authentication](https://platform.claude.com/docs/en/manage-claude/authentication) for the full picture, including short-lived credentials with Workload Identity Federation.
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