curl --request POST \
  --url https://commet.co/api/v1/usage/events \
  --header 'Content-Type: application/json' \
  --header 'x-api-key: <api-key>' \
  --data '
{
  "featureCode": "<string>",
  "customerId": "<string>",
  "model": "<string>",
  "inputTokens": 4503599627370495,
  "outputTokens": 4503599627370495,
  "value": "<unknown>"
}
'

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

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

const usageEvent = await commet.usage.track({
  featureCode: "api_calls",
  customerId: "user_123",
  model: "example",
  inputTokens: 1,
  outputTokens: 1,
});

from commet import Commet

commet = Commet("ck_xxx")

usage_event = commet.usage.track(
    feature_code="api_calls",
    customer_id="user_123",
    model="example",
    input_tokens=1,
    output_tokens=1,
)

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

usageEvent, err := client.Usage.Track(ctx, &commet.TrackUsageParams{
	FeatureCode: "api_calls",
	CustomerID: "user_123",
	Model: func(value string) *string { return &value }("example"),
	InputTokens: func(value int) *int { return &value }(1),
	OutputTokens: func(value int) *int { return &value }(1),
})
if err != nil {
	log.Fatal(err)
}

import co.commet.Commet;
import co.commet.params.TrackUsageParams;

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

var usageEvent = commet.usage().track(
    TrackUsageParams.builder("api_calls", "user_123").model("example").inputTokens(1L).outputTokens(1L).build()
);

use Commet\Commet;

$commet = new Commet('ck_xxx');

$usageEvent = $commet->usage->track(
    featureCode: 'api_calls',
    customerId: 'user_123',
    model: 'example',
    inputTokens: 1,
    outputTokens: 1,
);

{
  "id": "usage_1a2b3c4d",
  "featureCode": "api_calls",
  "value": 1,
  "customerId": "cus_1a2b3c4d",
  "eventId": "request_123",
  "ts": "2026-09-07T12:00:00.000Z",
  "createdAt": "2026-09-07T12:00:00.000Z",
  "properties": [
    {
      "property": "endpoint",
      "value": "/v1/search"
    }
  ],
  "object": "usage_event",
  "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": "billing_error",
    "code": "payment_failed",
    "message": "The payment could not be completed.",
    "doc_url": "https://commet.co/docs/api-reference/2026-08-27/errors/payment_failed.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": "validation_error",
    "code": "validation_error",
    "message": "The requested operation is not valid for the current configuration.",
    "doc_url": "https://commet.co/docs/api-reference/2026-08-27/errors/validation_error.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"
  }
}