curl -X POST 'https://api.anthropic.com/v1/organizations/external_keys?beta=true' \
  -H "x-api-key: $ANTHROPIC_API_KEY" \
  -H 'anthropic-version: 2023-06-01' \
  -H 'Content-Type: application/json' \
  -d '{
  "provider_config": {
    "kms_arn": "example-kms-arn",
    "region": "example-region",
    "role_arn": "example-role-arn",
    "type": "example-type"
  }
}'

# POST /v1/organizations/external_keys?beta=true (Claude API)
Base URL: https://api.anthropic.com
Auth: x-api-key; Anthropic API key; required.
Status: Beta.
Request formats: application/json.
Last verified: 2026-10-20

> Create External Key

## Critical Gotchas
* Authentication uses the `x-api-key` header and requests also require an `anthropic-version` header.
* The official OpenAPI URL is discovered from the SDK repository manifest and must remain under Anthropic's trusted Stainless storage prefix.

## cURL
curl -X POST 'https://api.anthropic.com/v1/organizations/external_keys?beta=true' \
  -H "x-api-key: $ANTHROPIC_API_KEY" \
  -H 'anthropic-version: 2023-06-01' \
  -H 'Content-Type: application/json' \
  -d '{
  "provider_config": {
    "kms_arn": "example-kms-arn",
    "region": "example-region",
    "role_arn": "example-role-arn",
    "type": "example-type"
  }
}'

## Parameters
| Name | In | Type | Required | Description |
| :--- | :--- | :--- | :--- | :--- |
| provider_config | body | object | Yes | KMS provider identity and auth coordinates. |
| display_name | body | string | No | Human-friendly display name. |
| geo | body | string | No | Data residency geo. Only `us` is supported. |

## Response example
{"attachment":{"type":"attached"},"created_at":"2026-09-03T00:00:00Z"}

---
Need an API key? Get one at https://console.anthropic.com/settings/keys

POST

POST /v1/organizations/external_keys?beta=true — Claude API

Beta

Anthropic API key (required); https://api.anthropic.com

Claude API

Create External Key

Base URL: https://api.anthropic.com
Auth: x-api-key: <ANTHROPIC_API_KEY>
Last verified: 2026-10-20 · upstream hash matched

Actions Try in browser→

Agents: curl -H "Accept: text/markdown" this URL
→ 233 tokens · Vary: Accept

Critical gotchas

Authentication uses the x-api-key header and requests also require an anthropic-version header.

The official OpenAPI URL is discovered from the SDK repository manifest and must remain under Anthropic's trusted Stainless storage prefix.

cURL

curl -X POST 'https://api.anthropic.com/v1/organizations/external_keys?beta=true' \  -H "x-api-key: $ANTHROPIC_API_KEY" \  -H 'anthropic-version: 2023-06-01' \  -H 'Content-Type: application/json' \  -d '{  "provider_config": {    "kms_arn": "example-kms-arn",    "region": "example-region",    "role_arn": "example-role-arn",    "type": "example-type"  }}'

Parameters

Name	In	Type	Required	Description
display_name	body	string	No	Human-friendly display name.
geo	body	string	No	Data residency geo. Only `us` is supported.
provider_config	body	object	Yes	KMS provider identity and auth coordinates.

Response 200 OK

{
  "attachment": {
    "type": "attached"
  },
  "created_at": "2026-09-03T00:00:00Z",
  "display_name": "string",
  "geo": "string",
  "id": "string",
  "provider_config": {
    "kms_arn": "string",
    "region": "string",
    "role_arn": "string",
    "type": "string"
  },
  "type": "external_key",
  "updated_at": "2026-09-03T00:00:00Z"
}

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