Are you tired of spending hours setting up backend infrastructure just to get a simple API running? What if you could deploy 40 production-ready APIs in under 5 minutes each — for free?
I built a collection of lightweight APIs on Cloudflare Workers (free tier), and they're all available on RapidAPI. Here's a curated list of the most useful ones, grouped by category.
🔧 Developer Utilities
1. QR Code Generator API
Generate QR codes with custom size, colors, and formats. Perfect for adding QR code generation to any app.
- Use case: Receipts, business cards, product labels
- Try it on RapidAPI →
2. JSON Formatter & Validator API
Format, minify, and validate JSON. Great for debugging pipelines.
- Use case: CI/CD validation, log formatting
- Try it on RapidAPI →
3. Hash & Encoding API
MD5, SHA-256, Base64, URL encoding — all in one endpoint.
- Use case: Security tools, data transformation
- Try it on RapidAPI →
4. Password Generator API
Generate cryptographically secure passwords with customizable rules.
- Use case: Registration flows, security tools
- Try it on RapidAPI →
5. Markdown to HTML Converter API
Convert Markdown to clean, sanitized HTML.
- Use case: CMS backends, documentation tools
- Try it on RapidAPI →
🌐 Web & SEO Tools
6. Link Preview API
Extract Open Graph metadata, titles, descriptions, and images from any URL.
- Use case: Social media tools, chat apps, link unfurling
- Try it on RapidAPI →
7. Screenshot API
Capture full-page screenshots of any website. Returns PNG or JPEG.
- Use case: Monitoring, archiving, SEO audits
- Try it on RapidAPI →
8. SEO Analyzer API
Analyze any URL for SEO best practices — title, meta, headings, image alt tags.
- Use case: SEO tools, content auditing
- Try it on RapidAPI →
9. WHOIS & Domain Lookup API
Get domain registration info, expiration dates, and nameservers.
- Use case: Domain monitoring, cybersecurity tools
- Try it on RapidAPI →
10. URL Shortener API
Shorten URLs with analytics tracking.
- Use case: Marketing tools, link management
- Try it on RapidAPI →
📊 Data & Content APIs
11. Email Validation API
Validate email format and MX records in real-time.
- Use case: Registration forms, mailing lists
- Try it on RapidAPI →
12. IP Geolocation API
Get country, city, ISP, and timezone from any IP address.
- Use case: Geo-targeting, fraud detection
- Try it on RapidAPI →
13. Currency Exchange API
Real-time exchange rates for 150+ currencies.
- Use case: E-commerce, fintech apps
- Try it on RapidAPI →
14. Text Analysis API
Readability scores, word count, sentiment analysis.
- Use case: Content tools, writing assistants
- Try it on RapidAPI →
15. AI Text Generator API
Generate text with AI — summaries, rewrites, and more.
- Use case: Content generation, chatbots
- Try it on RapidAPI →
📱 Social & Media
16. Social Video Downloader API
Extract video URLs from social media platforms.
- Use case: Media archiving, content tools
17. News Aggregator API
Aggregate news from multiple sources by keyword or category.
- Use case: News apps, research tools
18. AI Translation API
Translate text between 100+ languages using AI.
- Use case: Localization, multilingual apps
19. Trends API
Track trending topics across the web.
- Use case: Content strategy, market research
20. Company Data API
Get basic company info by domain or name.
- Use case: CRM enrichment, lead generation
📦 Bonus: More APIs (21-25)
- PDF Generator API — Generate PDFs from HTML/Markdown
- Placeholder Image API — Generate placeholder images on the fly
- Crypto Data API — Real-time crypto prices
- Weather API — Current weather by city or coordinates
- WordPress Internal Link API — Suggest internal links for WordPress sites
Why Cloudflare Workers?
All 25 APIs are built on Cloudflare Workers (free tier):
- ⚡ Sub-50ms response times (edge computing)
- 🌍 Deployed to 300+ locations globally
- 💰 100,000 requests/day free
- 🔒 Built-in DDoS protection
Try Them Free
All APIs have a free tier on RapidAPI — no credit card required.
👉 Browse all APIs by miccho27 on RapidAPI
If you find these useful, drop a ⭐ on RapidAPI and let me know which one you're using!
I'm building these APIs from Paraguay 🇵🇾 as part of my indie hacking journey. Follow me for more API tutorials and dev tool releases.
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