API Codex
Resources

Frequently Asked Questions (FAQ)

Find quick answers to the most common questions about API Codex. If you can't find what you're looking for, check our detailed documentation or contact support.

Getting Started

How do I get started with API Codex?

Getting started is simple:

  1. Sign up for a free RapidAPI account at rapidapi.com
  2. Browse the API Codex organization page
  3. Subscribe to the APIs you want to use (free tier available)
  4. Get your API key from the RapidAPI dashboard
  5. Make your first call using our Getting Started guide

Do I need programming experience to use API Codex?

Basic programming knowledge is recommended. You should be familiar with:

  • Making HTTP requests in your programming language
  • Working with JSON data
  • Basic API concepts

Our documentation includes code examples in multiple languages to help you get started quickly.

Where can I find code examples?

Code examples are available in:

  • Our Getting Started guide with examples in JavaScript, Python, PHP, and cURL
  • RapidAPI's API pages with auto-generated snippets in 20+ languages
  • Each API's documentation page in our API Catalog

Authentication & Security

How do I authenticate API requests?

All API Codex APIs use RapidAPI's authentication system:

javascriptCode
 
headers: {
  'x-rapidapi-key': 'YOUR_RAPIDAPI_KEY',
  'x-rapidapi-host': 'api-host-name.p.rapidapi.com'
}

Get your API key from your RapidAPI dashboard after subscribing to an API. See our Authentication Guide for detailed examples.

Is my API key secure?

Your API key security depends on how you use it:

✅ Do:

  • Store keys in environment variables
  • Keep keys server-side only
  • Use secrets management (AWS Secrets Manager, Azure Key Vault)
  • Rotate keys regularly

❌ Don't:

  • Expose keys in client-side code
  • Commit keys to version control
  • Share keys publicly
  • Hard-code keys in your application

Can I rotate my API key?

Yes, you can generate new API keys through your RapidAPI dashboard. It's a good security practice to rotate keys periodically, especially if a key may have been compromised.

What should I do if my API key is exposed?

If your API key is exposed:

  1. Immediately generate a new key in your RapidAPI dashboard
  2. Update your application with the new key
  3. Delete the old key
  4. Review recent API usage for any suspicious activity
  5. Audit your code to prevent future exposure

Pricing & Billing

Is there a free tier available?

Yes! All API Codex APIs offer a free tier on RapidAPI, perfect for:

  • Testing and development
  • Proof of concept projects
  • Small applications
  • Learning and experimentation

Free tier limits vary by API, typically offering 100-1,000 requests per month.

What are the pricing tiers?

API Codex follows RapidAPI's standard pricing model:

  • Basic (Free) - Limited requests, community support
  • Pro - Higher limits, email support
  • Ultra - Production-grade limits, priority support
  • Mega - Enterprise limits, dedicated support

Visit each API's page on RapidAPI for specific pricing details.

How am I billed for API usage?

Billing is handled through RapidAPI:

  • Unified billing - Single invoice for all API Codex APIs
  • Monthly subscription - Billed monthly based on your plan
  • Pay-as-you-go - Only pay for what you use
  • Transparent pricing - Clear costs visible before subscribing

Can I upgrade or downgrade my plan?

Yes, you can change your subscription tier at any time through the RapidAPI dashboard. Changes typically take effect immediately, and billing is prorated accordingly.

What happens if I exceed my rate limit?

If you exceed your rate limit:

  • The API returns a 429 Too Many Requests error
  • You can either wait for your quota to reset (typically monthly)
  • Or upgrade to a higher tier for more requests

Implement proper rate limit handling in your code to manage this gracefully. See our Rate Limiting guide.

API Usage

What APIs does API Codex offer?

API Codex provides several categories of APIs:

Email Services:

  • Email Intelligence API
  • Email Deliverability API
  • Email Parser API

Document Parsers:

  • Resume Parser API
  • Invoice Parser API
  • Receipt Parser API
  • Skill Parser API

Text Intelligence:

  • Text Analysis API
  • Text Anonymization API

Infrastructure:

  • DNS Lookup API
  • SERP API

Browse all APIs in our API Catalog.

Can I use multiple APIs with one key?

Yes! Your RapidAPI key works across all API Codex APIs. Simply change the x-rapidapi-host header to match the API you're calling:

javascriptCode
 
// DNS API
headers: { 'x-rapidapi-host': 'advanced-dns-lookup-api.p.rapidapi.com' }

// Email API
headers: { 'x-rapidapi-host': 'email-intelligence-api.p.rapidapi.com' }

What data formats do you support?

  • Request formats: JSON, query parameters, form data (varies by endpoint)
  • Response format: JSON (all APIs)
  • Character encoding: UTF-8
  • Date format: ISO 8601 (YYYY-MM-DDTHH:mm)

Do you offer batch processing?

Some APIs support batch processing, allowing you to process multiple items in a single request. Check each API's documentation for batch capabilities and limits.

What's the maximum request size?

Maximum request sizes vary by API and subscription tier:

  • Free tier: Typically 1-5 MB
  • Paid tiers: Up to 10-50 MB

Large files may require asynchronous processing. Check your specific API's documentation for exact limits.

Rate Limiting

What are the rate limits?

Rate limits depend on your RapidAPI subscription tier:

TierRequests/MonthRequests/Second
Basic (Free)100-1,0001-5
Pro10,000-50,00010-20
Ultra100,000-500,00050-100
Mega1M+100+

Exact limits vary by API. Check your API's RapidAPI page for specific details.

How can I check my current usage?

Monitor your usage through:

  • RapidAPI Dashboard - Real-time usage statistics
  • Response headers - x-ratelimit-* headers in API responses
  • Analytics - Detailed usage analytics on RapidAPI

What happens when I hit the rate limit?

When you exceed your rate limit:

  • API returns HTTP 429 Too Many Requests
  • Response includes Retry-After header
  • Your quota resets at the start of the next billing period

Implement retry logic with exponential backoff to handle rate limits gracefully.

How can I optimize my API usage?

To stay within rate limits:

  • Cache responses based on TTL values
  • Batch requests when supported
  • Implement request queuing to control request rate
  • Use webhooks instead of polling
  • Monitor usage regularly

See our Best Practices guide for optimization strategies.

Error Handling

What error codes might I encounter?

Common error codes:

CodeMeaningSolution
400Bad RequestCheck request parameters
401UnauthorizedVerify API key
403ForbiddenCheck subscription status
404Not FoundVerify endpoint URL
429Too Many RequestsImplement rate limiting
500Server ErrorRetry with backoff
503Service UnavailableRetry later

How should I handle errors?

Best practices for error handling:

  1. Catch all errors - Don't let errors crash your app
  2. Log errors - Track issues for debugging
  3. Implement retries - Use exponential backoff for transient errors
  4. Set timeouts - Don't wait indefinitely
  5. Provide fallbacks - Handle graceful degradation

See our comprehensive Error Handling guide.

Why am I getting 401 Unauthorized errors?

Common causes:

  • Missing or incorrect API key
  • API key not in the correct header (x-rapidapi-key)
  • Missing x-rapidapi-host header
  • Expired or revoked API key

Solution: Verify your headers are correctly set and your API key is valid.

Why am I getting 403 Forbidden errors?

Common causes:

  • Subscription expired or cancelled
  • API not subscribed in your RapidAPI account
  • Using wrong API key for this API
  • Account suspended

Solution: Check your RapidAPI subscription status and ensure you're subscribed to the API.

Integration

What programming languages are supported?

API Codex APIs are RESTful and work with any language that can make HTTP requests:

  • JavaScript/Node.js
  • Python
  • PHP
  • Ruby
  • Java
  • Go
  • C#/.NET
  • Swift
  • Kotlin
  • And many more

RapidAPI provides auto-generated code snippets in 20+ languages.

Can I use API Codex with my framework?

Yes! API Codex works with all web frameworks:

  • Frontend: React, Vue, Angular (via backend proxy)
  • Backend: Express, Django, Flask, Laravel, Rails, Spring Boot, etc.
  • Serverless: AWS Lambda, Azure Functions, Google Cloud Functions
  • Mobile: React Native, Flutter, native iOS/Android

Where can I test the APIs before integration?

Test APIs using:

  • RapidAPI Playground - Interactive testing in your browser
  • Postman - Import RapidAPI collections
  • cURL - Command-line testing
  • Our examples - Copy and modify code snippets

Do you provide SDKs?

Currently, API Codex uses RapidAPI's standard REST interface. RapidAPI provides auto-generated code snippets in 20+ languages, which serve as SDK alternatives.

Can I use API Codex in a mobile app?

Yes, but follow these guidelines:

  • Never expose API keys in mobile apps
  • Always use a backend proxy/API gateway
  • Make API calls from your backend, not directly from the app
  • Your backend should validate requests and forward them to API Codex

Technical Questions

What's the API uptime/SLA?

API Codex APIs are hosted on RapidAPI's infrastructure:

  • Uptime: 99.9% SLA
  • Global availability via RapidAPI's worldwide infrastructure
  • Auto-scaling to handle traffic spikes
  • Status monitoring available on RapidAPI

What regions are APIs available in?

API Codex APIs are available globally through RapidAPI's worldwide infrastructure, ensuring low latency regardless of your location.

Do you support webhooks?

Webhook support varies by API. Some APIs support:

  • Callback URLs for asynchronous operations
  • Event notifications for specific triggers
  • Result delivery via POST requests

Check individual API documentation for webhook capabilities.

Can I make requests from the browser (CORS)?

For security reasons, API keys should never be exposed in browser code. Instead:

  • Create a backend proxy endpoint
  • Make API calls from your server
  • Return sanitized results to your frontend

This protects your API key and provides better security.

What's the API response time?

Response times vary by API and complexity:

  • Simple lookups (DNS, email validation): 100-500ms
  • Parsing operations: 1-5 seconds
  • Complex analysis: 5-30 seconds

Actual times depend on request complexity, payload size, and network conditions.

Can I cache API responses?

Yes, caching is encouraged for:

  • Reducing API calls
  • Improving performance
  • Staying within rate limits

Implement caching based on:

  • TTL values in DNS responses
  • Data volatility
  • Your application's needs

See our Best Practices guide for caching strategies.

Support & Resources

Where can I get help?

Multiple support channels are available:

  • Documentation - Comprehensive guides at docs.apicodex.io
  • RapidAPI Support - Through your RapidAPI dashboard
  • Code Examples - Available in all documentation
  • Community - RapidAPI forums and discussions
  • Email Support - Available for paid tiers

How do I report a bug?

To report bugs:

  1. Check if the issue is already known
  2. Gather error messages and request details
  3. Contact support through RapidAPI
  4. Provide reproduction steps if possible

Can I request new features?

Yes! We welcome feature requests:

  • Submit through RapidAPI support
  • Describe your use case
  • Explain the expected behavior
  • Priority given to requests from paid subscribers

Where is the API status page?

Monitor API status through:

  • RapidAPI's status monitoring
  • Response headers indicating health
  • Your RapidAPI analytics dashboard

Do you offer enterprise support?

Yes, enterprise support is available:

  • Mega tier on RapidAPI includes premium support
  • Dedicated account management for large deployments
  • Custom SLAs available upon request
  • Integration assistance from our team

Contact us through RapidAPI for enterprise inquiries.

Still Have Questions?

Can't find the answer you're looking for? Here are additional resources:

For specific technical questions, consult the detailed documentation for your API in our API Catalog.

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