curl --request POST \
  --url https://commet.co/api/v1/addons \
  --header 'Content-Type: application/json' \
  --header 'x-api-key: <api-key>' \
  --data '
{
  "name": "<string>",
  "basePrice": 4503599627370495,
  "featureId": "<string>",
  "consumptionModel": "boolean"
}
'

import { Commet } from "@commet/node";

const commet = new Commet({ apiKey: "ck_xxx" });

const addon = await commet.addons.create({
  name: "example",
  basePrice: 1,
  featureId: "ftr_xxx",
  consumptionModel: "boolean",
});

from commet import Commet

commet = Commet("ck_xxx")

addon = commet.addons.create(
    name="example",
    base_price=1,
    feature_id="ftr_xxx",
    consumption_model="boolean",
)

client, err := commet.New("ck_xxx")
if err != nil {
	log.Fatal(err)
}
ctx := context.Background()

addon, err := client.Addons.Create(ctx, &commet.CreateAddonParams{
	Name: "example",
	BasePrice: 1,
	FeatureID: "ftr_xxx",
	ConsumptionModel: "boolean",
})
if err != nil {
	log.Fatal(err)
}

import co.commet.Commet;
import co.commet.params.CreateAddonParams;

var commet = Commet.builder().apiKey("ck_xxx").build();

var addon = commet.addons().create(
    CreateAddonParams.builder("example", 1L, "ftr_xxx", "boolean").build()
);

use Commet\Commet;

$commet = new Commet('ck_xxx');

$addon = $commet->addons->create(
    name: 'example',
    basePrice: 1,
    featureId: 'ftr_xxx',
    consumptionModel: 'boolean',
);

{
  "id": "addon_1a2b3c4d",
  "name": "Extra API calls",
  "slug": "extra-api-calls",
  "description": "An additional 1,000 API calls per billing period",
  "basePrice": 1000,
  "featureCode": "api_calls",
  "featureName": "API Calls",
  "createdAt": "2026-09-07T12:00:00.000Z",
  "updatedAt": "2026-09-07T12:00:00.000Z",
  "consumptionModel": "metered",
  "includedUnits": 1000,
  "overageRate": null,
  "creditCost": null,
  "object": "addon",
  "livemode": false
}

{
  "error": {
    "type": "validation_error",
    "code": "validation_error",
    "message": "The request contains an invalid parameter.",
    "doc_url": "https://commet.co/docs/api-reference/2026-08-27/errors/validation_error.md"
  }
}

{
  "error": {
    "type": "authentication_error",
    "code": "unauthorized",
    "message": "A valid API key is required.",
    "doc_url": "https://commet.co/docs/api-reference/2026-08-27/errors/unauthorized.md"
  }
}

{
  "error": {
    "type": "authentication_error",
    "code": "forbidden",
    "message": "You do not have permission to perform this operation.",
    "doc_url": "https://commet.co/docs/api-reference/2026-08-27/errors/forbidden.md"
  }
}

{
  "error": {
    "type": "not_found_error",
    "code": "not_found",
    "message": "The requested resource was not found.",
    "doc_url": "https://commet.co/docs/api-reference/2026-08-27/errors/not_found.md"
  }
}

{
  "error": {
    "type": "conflict_error",
    "code": "idempotency_in_progress",
    "message": "A request with this idempotency key is still being processed.",
    "doc_url": "https://commet.co/docs/api-reference/2026-08-27/errors/idempotency_in_progress.md"
  }
}

{
  "error": {
    "type": "rate_limit_error",
    "code": "rate_limited",
    "message": "Too many requests. Retry after the interval specified in the Retry-After header.",
    "doc_url": "https://commet.co/docs/api-reference/2026-08-27/errors/rate_limited.md"
  }
}

{
  "error": {
    "type": "internal_error",
    "code": "internal_error",
    "message": "An unexpected error occurred while processing the request.",
    "doc_url": "https://commet.co/docs/api-reference/2026-08-27/errors/internal_error.md"
  }
}

{
  "error": {
    "type": "internal_error",
    "code": "idempotency_unavailable",
    "message": "Idempotency storage is temporarily unavailable. Retry with the same idempotency key.",
    "doc_url": "https://commet.co/docs/api-reference/2026-08-27/errors/idempotency_unavailable.md"
  }
}