Most requests to Split's API are authenticated with an Admin API key. Some requests are authenticated with a client-side or server-side SDK API key.

The Admin key can be finely-tuned to provide access to your Split resources. Creating an API key is simple, as described on the Create an API Key page under the API Keys section.

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Learn more about API keys
To best familiarize yourself with using API keys in Split, refer to the API keys guide in our main documentation site for more information.
To learn more about Admin API Key roles and scopes, just check out API keys overview

You can also authenticate with a Harness personal access token (PAT) or a Service Account Token (SAT). Both are supported for all non-deprecated Split API endpoints.

Choose a credential type

Admin API keys: Provide fine-grained access to Split resources. For more information about roles and scopes, see API keys overview.
SDK API keys: Used with client-side or server-side SDKs.
Harness PATs: Issued through the Harness platform, and valid for authenticating against supported Split APIs. Use these in place of Admin API keys if you already manage authentication centrally in Harness.
Harness SATs: Issued to service accounts in Harness, and valid for authenticating against supported Split APIs. Use these for automated integrations or workloads that require long-lived credentials tied to a non-human account.

Authentication Header

Credentials must be sent in the appropriate HTTP header, depending on the token type. Replace the placeholder with your own key or token. Use one header per request; do not include both Authorization and x-api-key at the same time.

Substitute ADMIN_API_KEY with your Admin API key.

Authorization: "Bearer ADMIN_API_KEY"

Substitute SDK_API_KEY with your client-side or server-side SDK API key.

Authorization: "Bearer SDK_API_KEY"

Substitute HARNESS_PAT with your Harness PAT.

Authorization: "Bearer HARNESS_PAT"

For more information on creating and managing PATs, see the Harness documentation.

Substitute HARNESS_SAT with your Harness SAT.

x-api-key: "HARNESS_SAT"

For more information on creating and managing SATs, see the Harness documentation.