Claude Platform Docs

Create External Key

POST/v1/organizations/external_keys

Create an external key config owned by the caller's organization.

Headers
"anthropic-version": optional string

The version of the Claude API you want to use.

Read more about versioning and our version history here.

Body
provider_config: BetaAWSExternalKeyConfig or BetaGCPExternalKeyConfig or BetaAzureExternalKeyConfigParam

KMS provider identity and auth coordinates.

One of the following:
BetaAWSExternalKeyConfig object{ type: "aws", kms_arn, region, role_arn }
type: "aws"
kms_arn: string

Full ARN of the AWS KMS key. On Claude Platform on AWS, alias ARNs are rejected, and your organization's own key must be a single-Region key in your organization's AWS account.

maxLength2048
region: optional string or null

AWS region. Derived from kms_arn if omitted.

role_arn: optional string or null⁠Deprecated

IAM role ARN. Deprecated; this field is ignored.

BetaGCPExternalKeyConfig object{ type: "gcp", key_name }
type: "gcp"
key_name: string

Full resource name of the Cloud KMS key.

BetaAzureExternalKeyConfigParam object{ type: "azure", key_name, tenant_id, 2 more }

Azure Key Vault provider configuration.

type: "azure"
key_name: string

Name of the key within the vault.

tenant_id: string

Azure AD tenant ID.

vault_uri: string

Key Vault data-plane URI — https://{vault-name}.vault.azure.net or https://{hsm-name}.managedhsm.azure.net.

client_id: optional string or null

Azure AD application (client) ID. Omit to use Anthropic's multitenant app. Provide only if using a single-tenant app registration in the customer's directory.

display_name: optional string or null

Human-friendly display name.

minLength1
maxLength255
geo: optional "us"

Data residency geo. Only us is supported.

user_profile_id: optional string or null

ID of a user profile to bind the key to. Omit this field for a key that isn't bound to a user profile. Such a key can be attached to a Workspace whatever its user profile. The binding cannot be changed later. A key bound to a user profile can only be attached to a Workspace that has the same user profile.

Returns
BetaExternalKey object{ type: "external_key", id, attachment, 6 more }

CMEK external key config belonging to the caller's organization.

Configs are organization-scoped. Workspaces attach to a config; once any workspace references it, the provider fields become effectively immutable (existing encrypted data needs the config for decrypt).

Create External Key
curl https://api.anthropic.com/v1/organizations/external_keys \
    -H 'Content-Type: application/json' \
    -H 'anthropic-version: 2026-10-21' \
    -H "Authorization: Bearer $ANTHROPIC_API_KEY" \
    -d '{
          "provider_config": {
            "kms_arn": "arn:aws:kms:us-east-1:111122223333:key/abcd1234-5678-90ab-cdef-000011112222",
            "type": "aws"
          },
          "user_profile_id": "uprof_01SDCCSbTxrXDpWc1phhtcfK"
        }'
Returns Examples
Response 200
{
  "id": "ekey_01SDCCSbTxrXDpWc1phhtcfK",
  "attachment": {
    "type": "attached"
  },
  "created_at": "2024-10-30T23:58:27.427722Z",
  "display_name": "prod-us-key",
  "geo": "us",
  "provider_config": {
    "kms_arn": "arn:aws:kms:us-east-1:111122223333:key/abcd1234-5678-90ab-cdef-000011112222",
    "type": "aws",
    "region": "us-east-1",
    "role_arn": "arn:aws:iam::111122223333:role/anthropic-cmek"
  },
  "type": "external_key",
  "updated_at": "2024-10-30T23:58:27.427722Z",
  "user_profile_id": "uprof_01SDCCSbTxrXDpWc1phhtcfK"
}