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

# API Key Signer (Deprecated)

> Configure an API key signer for wallet creation. This signer type is deprecated.

<Warning>
  **You are viewing docs for the previous version of the Wallets SDK.** We recommend upgrading to V1.
  See the [updated version of this page](/wallets/guides/signers/server-key) or the [V1 migration guide](/wallets/guides/migrate-to-v1).
</Warning>

<Warning>
  Server signers are the standard for server-side and agent operations. Unlike API key signers — which used your primary API key as the signing mechanism itself — server signers are dedicated signing credentials, giving you stronger isolation and a smaller blast radius if credentials are ever rotated or compromised.

  API key signers are deprecated and will be removed in a future release. To take advantage of the improved security model, migrate any server-side or agent workflows to [server signers](/wallets/guides/signers/server-signer).
</Warning>

In earlier versions of the Crossmint Wallets API, an API key could be used directly as an operational signer. This model is deprecated in favor of dedicated signer types that separate authentication (API key) from transaction authorization (signer key).

For a conceptual overview, see [API key](/wallets/v0/concepts/wallet-signers#api-key) in the Wallet Signers guide.

## Configuration

<Tabs>
  <Tab title="React">
    ```typescript theme={null}
    import { useWallet } from '@crossmint/client-sdk-react-ui';

    const { getOrCreateWallet } = useWallet();

    const wallet = await getOrCreateWallet({
        chain: "evm",
        signer: {
            type: "api-key",
        },
    });
    ```
  </Tab>

  <Tab title="Node.js">
    ```typescript theme={null}
    import { CrossmintWallets, createCrossmint } from "@crossmint/wallets-sdk";

    const crossmint = createCrossmint({
        apiKey: "<your-server-api-key>",
    });
    const crossmintWallets = CrossmintWallets.from(crossmint);

    const wallet = await crossmintWallets.createWallet({
        chain: "evm",
        signer: {
            type: "api-key",
        },
    });
    ```
  </Tab>

  <Tab title="React Native">
    ```typescript theme={null}
    import { useWallet } from '@crossmint/client-sdk-react-native-ui';

    const { getOrCreateWallet } = useWallet();

    const wallet = await getOrCreateWallet({
        chain: "evm",
        signer: {
            type: "api-key",
        },
    });
    ```
  </Tab>

  <Tab title="REST">
    <CodeGroup>
      ```bash cURL theme={null}
      curl --request POST \
          --url https://staging.crossmint.com/api/2025-06-09/wallets \
          --header 'Content-Type: application/json' \
          --header 'X-API-KEY: <x-api-key>' \
          --data '{
              "chainType": "evm",
              "config": {
                  "adminSigner": {
                      "type": "api-key"
                  }
              }
          }'
      ```

      ```js Node.js theme={null}
      const url = 'https://staging.crossmint.com/api/2025-06-09/wallets';

      const payload = {
          chainType: "evm",
          config: {
              adminSigner: {
                  type: "api-key"
              }
          }
      };

      const options = {
          method: 'POST',
          headers: {
              'X-API-KEY': '<x-api-key>',
              'Content-Type': 'application/json'
          },
          body: JSON.stringify(payload)
      };

      try {
          const response = await fetch(url, options);
          const data = await response.json();
          console.log(data);
      } catch (error) {
          console.error(error);
      }
      ```

      ```python Python theme={null}
      import requests

      url = "https://staging.crossmint.com/api/2025-06-09/wallets"

      payload = {
          "chainType": "evm",
          "config": {
              "adminSigner": {
                  "type": "api-key"
              }
          }
      }
      headers = {
          "X-API-KEY": "<x-api-key>",
          "Content-Type": "application/json"
      }

      response = requests.post(url, json=payload, headers=headers)

      print(response.json())
      ```
    </CodeGroup>
  </Tab>
</Tabs>