Tracking Usage

The Track Endpoint

POST /api/v1/sdk/track
X-API-Key: org_live_<your_key>

Request Body

{
  "meter_token": "string (required)",
  "customer_external_id": "string (required)",
  "quantity": 1,
  "timestamp": "2025-01-15T10:30:00Z",
  "idempotency_key": "string",
  "metadata": {
    "key": "value"
  }
}

Field	Required	Description
`meter_token`	✅	Unique token from your meter
`customer_external_id`	✅	Your customer’s ID
`quantity`	✅	Usage amount (> 0)
`timestamp`		Defaults to now if omitted
`idempotency_key`		Prevents duplicate events on retry
`metadata`		Extra data; required `user_id` key for UNIQUE_COUNT meters

Language Examples

Python
Node.js
Go

import requests
import uuid

FLUXRATE_API_KEY = "org_live_your_key"
FLUXRATE_BASE_URL = "https://api.fluxrate.co/api/v1"

def track_usage(
    meter_token: str,
    customer_external_id: str,
    quantity: float,
    idempotency_key: str = None,
    metadata: dict = None
) -> dict:
    """Track a usage event with Fluxrate."""
    payload = {
        "meter_token": meter_token,
        "customer_external_id": customer_external_id,
        "quantity": quantity,
    }
    if idempotency_key:
        payload["idempotency_key"] = idempotency_key
    if metadata:
        payload["metadata"] = metadata

    response = requests.post(
        f"{FLUXRATE_BASE_URL}/sdk/track",
        headers={
            "Content-Type": "application/json",
            "X-API-Key": FLUXRATE_API_KEY,
        },
        json=payload,
        timeout=5,
    )
    response.raise_for_status()
    return response.json()


# Example usage
try:
    result = track_usage(
        meter_token="550e8400-e29b-41d4-a716-446655440000",
        customer_external_id="acme-corp-001",
        quantity=100,
        idempotency_key=f"order_{order_id}_api_calls",
    )
    print(f"Tracked event: {result['id']}")
except requests.exceptions.RequestException as e:
    # Log and handle gracefully — don't fail the main request
    logger.error(f"Failed to track usage: {e}")

const FLUXRATE_API_KEY = process.env.FLUXRATE_API_KEY;
const FLUXRATE_BASE_URL = 'https://api.fluxrate.co/api/v1';

async function trackUsage({
  meterToken,
  customerExternalId,
  quantity,
  idempotencyKey,
  metadata,
}) {
  const response = await fetch(`${FLUXRATE_BASE_URL}/sdk/track`, {
    method: 'POST',
    headers: {
      'Content-Type': 'application/json',
      'X-API-Key': FLUXRATE_API_KEY,
    },
    body: JSON.stringify({
      meter_token: meterToken,
      customer_external_id: customerExternalId,
      quantity,
      ...(idempotencyKey && { idempotency_key: idempotencyKey }),
      ...(metadata && { metadata }),
    }),
    signal: AbortSignal.timeout(5000),
  });

  if (!response.ok) {
    const error = await response.json();
    throw new Error(`Fluxrate track failed: ${error.detail || response.status}`);
  }

  return response.json();
}

// Example usage (fire-and-forget)
trackUsage({
  meterToken: '550e8400-e29b-41d4-a716-446655440000',
  customerExternalId: 'acme-corp-001',
  quantity: 1,
  idempotencyKey: `req_${requestId}`,
}).catch(err => console.error('Failed to track usage:', err));

package fluxrate

import (
    "bytes"
    "encoding/json"
    "fmt"
    "net/http"
    "time"
)

type TrackRequest struct {
    MeterToken         string                 `json:"meter_token"`
    CustomerExternalID string                 `json:"customer_external_id"`
    Quantity           float64                `json:"quantity"`
    IdempotencyKey     string                 `json:"idempotency_key,omitempty"`
    Timestamp          *time.Time             `json:"timestamp,omitempty"`
    Metadata           map[string]interface{} `json:"metadata,omitempty"`
}

func TrackUsage(apiKey string, req TrackRequest) error {
    body, err := json.Marshal(req)
    if err != nil {
        return fmt.Errorf("marshal: %w", err)
    }

    httpReq, err := http.NewRequest(
        "POST",
        "https://api.fluxrate.co/api/v1/sdk/track",
        bytes.NewReader(body),
    )
    if err != nil {
        return err
    }

    httpReq.Header.Set("Content-Type", "application/json")
    httpReq.Header.Set("X-API-Key", apiKey)

    client := &http.Client{Timeout: 5 * time.Second}
    resp, err := client.Do(httpReq)
    if err != nil {
        return fmt.Errorf("request: %w", err)
    }
    defer resp.Body.Close()

    if resp.StatusCode != http.StatusCreated {
        return fmt.Errorf("unexpected status: %d", resp.StatusCode)
    }

    return nil
}

Tracking UNIQUE_COUNT Events

For UNIQUE_COUNT meters, include the value to count in metadata.user_id:

{
  "meter_token": "...",
  "customer_external_id": "acme-corp-001",
  "quantity": 1,
  "metadata": {
    "user_id": "end_user_456"
  }
}

Best Practices

Use idempotency keys

Always pass a unique idempotency_key so it’s safe to retry failed requests without double-counting.

idempotency_key = f"job_{job_id}_step_3"

Track asynchronously

Don’t block your main request path waiting for Fluxrate’s response. Track usage in a background task or fire-and-forget.

asyncio.create_task(track_usage(...))

Handle failures gracefully

Log tracking failures but don’t let them break your main workflow. Implement retry logic with exponential backoff for transient errors.

Batch high-volume events

If you have millions of events per day, pre-aggregate at your backend and send totals every minute rather than sending individual events.

# Instead of: track(quantity=1) for each request
# Do: track(quantity=counter.get_and_reset()) every 60 seconds

Get Started

Product Guide

Developer Guides

The Track Endpoint

Request Body

Language Examples

Tracking UNIQUE_COUNT Events

Best Practices

Get Started

Product Guide

Developer Guides

​The Track Endpoint

​Request Body

​Language Examples

​Tracking UNIQUE_COUNT Events

​Best Practices

The Track Endpoint

Request Body

Language Examples

Tracking UNIQUE_COUNT Events

Best Practices