name: Parcel Monitor API Rate Limits
description: Rate limiting and usage constraints for the Parcel Monitor Tracking
  API. Specific rate limit values are determined at the enterprise contract level
  and are not publicly disclosed. The API enforces standard HTTP rate limit responses
  and supports webhook-driven architectures to reduce polling frequency.
url: https://www.parcelmonitor.com/track-parcel-express-tracking-api/
rate-limits:
  - name: API Request Rate
    description: Per-key request frequency limits are set based on contract tier
      and volume requirements. Exceeding limits returns HTTP 429 Too Many Requests.
      Exact thresholds are negotiated at onboarding for enterprise plans.
    limit: contact-sales
    unit: requests
    period: second
    scope: api-key
    error-code: 429
    error-message: Rate limit exceeded
  - name: Carrier Detection Latency
    description: Smart carrier auto-detection from tracking ID format and location
      data operates in real time with very low latency. Covers approximately 1,000+
      carriers globally without manual carrier code specification.
    unit: carriers
    scope: request
  - name: Tracking Event Normalization
    description: All carrier tracking events are normalized into a standardized set
      of 155+ event types. Standardization includes location normalization and local
      time zone conversion for each tracking update.
    limit: 155
    unit: event-types
    scope: global
  - name: Language Support
    description: Tracking status updates and notifications are available in 30+ languages
      with automatic localization applied server-side before webhook delivery or API
      response.
    limit: 30
    unit: languages
    scope: global
  - name: Webhook Delivery
    description: Webhook push notifications are delivered in real time for every
      carrier tracking event update. Each event triggers a push to the registered
      webhook endpoint URL. Retry logic and delivery guarantees are defined per enterprise
      contract.
    unit: events
    period: real-time
    scope: webhook-endpoint
http-status-codes:
  - code: 200
    meaning: Successful request. Tracking data or acknowledgement returned in response
      body.
  - code: 400
    meaning: Bad request. Missing or malformed tracking number, carrier code, or
      request parameters.
  - code: 401
    meaning: Unauthorized. Invalid or missing API key in request headers.
  - code: 403
    meaning: Forbidden. API key lacks permission for the requested endpoint or operation.
  - code: 404
    meaning: Not found. Tracking number not registered or endpoint does not exist.
  - code: 429
    meaning: Too many requests. Rate limit exceeded for the current API key. Reduce
      request frequency or implement webhook-based architecture.
  - code: 500
    meaning: Internal server error. Retry after a brief delay.
  - code: 503
    meaning: Service unavailable. Temporary outage or maintenance window. Monitor
      status page for updates.