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miccho27
miccho27

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20+ Free APIs Every Developer Needs in 2026 — No Auth Required

#webdev #api #programming #tutorial

You know the drill. You need a quick API for your side project — QR codes, currency rates, screenshot capture — and you end up wrestling with OAuth flows, billing dashboards, and 47-page docs before you can make a single request.

I built a collection of 24 lightweight APIs running on Cloudflare Workers' edge network. They all share the same philosophy:

  • No authentication required for the free tier
  • 500 requests/month free (some endpoints offer 100/mo)
  • Sub-50ms response times via 300+ global edge locations
  • Zero cold starts — no containers, no lambdas, no waiting

Every API below is available on RapidAPI. Let me walk you through the highlights.

1. QR Code Generator API

Generate QR codes in PNG, SVG, or Base64 with custom colors and error correction levels.

curl "https://YOUR_RAPIDAPI_HOST/generate?text=https://example.com&size=300&format=png&color=000000&bgcolor=FFFFFF"
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import requests

response = requests.get(
    "https://YOUR_RAPIDAPI_HOST/generate",
    params={"text": "https://example.com", "size": 300, "format": "svg"}
)
print(response.text)
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Try it on RapidAPI

2. Email Validation API

Check if an email is valid, detect disposable providers, verify MX records, and suggest typo corrections.

curl "https://YOUR_RAPIDAPI_HOST/validate?email=user@gmial.com"
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import requests

response = requests.get(
    "https://YOUR_RAPIDAPI_HOST/validate",
    params={"email": "user@gmial.com"}
)
data = response.json()
print(data["suggestion"])  # "user@gmail.com"
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3. Link Preview / Website Metadata API

Extract Open Graph tags, Twitter Cards, favicons, and RSS feeds from any URL. Perfect for building link preview cards like Slack or Discord.

curl "https://YOUR_RAPIDAPI_HOST/preview?url=https://github.com"
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import requests

response = requests.get(
    "https://YOUR_RAPIDAPI_HOST/preview",
    params={"url": "https://github.com"}
)
meta = response.json()
print(meta["title"], meta["image"])
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Try it on RapidAPI

4. Website Screenshot API

Capture full-page screenshots in PNG or JPEG with custom viewport sizes.

curl "https://YOUR_RAPIDAPI_HOST/screenshot?url=https://example.com&width=1280&height=720&format=png"
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import requests

response = requests.get(
    "https://YOUR_RAPIDAPI_HOST/screenshot",
    params={"url": "https://example.com", "width": 1280, "format": "png"}
)
with open("screenshot.png", "wb") as f:
    f.write(response.content)
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Try it on RapidAPI

5. Text Analysis / NLP API

Sentiment analysis, keyword extraction, readability scoring, and language detection — all in one endpoint.

curl -X POST "https://YOUR_RAPIDAPI_HOST/sentiment" \
  -H "Content-Type: application/json" \
  -d '{"text": "This API is incredibly fast and easy to use!"}'
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import requests

response = requests.post(
    "https://YOUR_RAPIDAPI_HOST/sentiment",
    json={"text": "This API is incredibly fast and easy to use!"}
)
result = response.json()
print(result["sentiment"], result["score"])
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6. IP Geolocation API

Get country, city, timezone, ISP, and VPN detection for any IP. Call /me to geolocate the requester.

curl "https://YOUR_RAPIDAPI_HOST/me"
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import requests

response = requests.get("https://YOUR_RAPIDAPI_HOST/me")
geo = response.json()
print(f"{geo['city']}, {geo['country']} (VPN: {geo['is_vpn']})")
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7. URL Shortener API

Shorten URLs with optional custom aliases and get click analytics.

curl -X POST "https://YOUR_RAPIDAPI_HOST/shorten" \
  -H "Content-Type: application/json" \
  -d '{"url": "https://dev.to/some-very-long-article-url", "alias": "my-link"}'
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import requests

response = requests.post(
    "https://YOUR_RAPIDAPI_HOST/shorten",
    json={"url": "https://dev.to/some-very-long-article-url"}
)
print(response.json()["short_url"])
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8. JSON Formatter & Validator API

Validate, format, minify, diff two JSON objects, or convert JSON to CSV.

curl -X POST "https://YOUR_RAPIDAPI_HOST/format" \
  -H "Content-Type: application/json" \
  -d '{"json": "{\"name\":\"dev\",\"lang\":\"python\"}", "indent": 2}'
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import requests

response = requests.post(
    "https://YOUR_RAPIDAPI_HOST/format",
    json={"json": '{"name":"dev","lang":"python"}', "indent": 2}
)
print(response.json()["formatted"])
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9. Hash & Encoding API

SHA256, bcrypt, Base64, HMAC, and more. Useful for building auth systems or verifying data integrity.

curl -X POST "https://YOUR_RAPIDAPI_HOST/hash" \
  -H "Content-Type: application/json" \
  -d '{"text": "hello world", "algorithm": "sha256"}'
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import requests

response = requests.post(
    "https://YOUR_RAPIDAPI_HOST/hash",
    json={"text": "hello world", "algorithm": "sha256"}
)
print(response.json()["hash"])
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10. Currency Exchange Rate API

Real-time exchange rates for 30+ currencies sourced from the ECB, with historical data support.

curl "https://YOUR_RAPIDAPI_HOST/rates?base=USD&symbols=EUR,JPY,GBP"
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import requests

response = requests.get(
    "https://YOUR_RAPIDAPI_HOST/rates",
    params={"base": "USD", "symbols": "EUR,JPY,GBP"}
)
rates = response.json()["rates"]
print(f"1 USD = {rates['EUR']} EUR")
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Try it on RapidAPI

11. AI Text API (Llama 3.1)

Generate text, summarize articles, rewrite content, or translate — powered by Llama 3.1.

curl -X POST "https://YOUR_RAPIDAPI_HOST/generate" \
  -H "Content-Type: application/json" \
  -d '{"prompt": "Explain WebSockets in 3 sentences", "max_tokens": 200}'
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import requests

response = requests.post(
    "https://YOUR_RAPIDAPI_HOST/generate",
    json={"prompt": "Explain WebSockets in 3 sentences", "max_tokens": 200}
)
print(response.json()["text"])
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12. Social Video Downloader API

Extract direct download URLs from TikTok, YouTube, Instagram, and Twitter/X.

curl "https://YOUR_RAPIDAPI_HOST/download?url=https://www.tiktok.com/@user/video/123456"
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import requests

response = requests.get(
    "https://YOUR_RAPIDAPI_HOST/download",
    params={"url": "https://www.tiktok.com/@user/video/123456"}
)
print(response.json()["download_url"])
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13. Crypto Data API

Real-time prices and market data for Bitcoin, Ethereum, and other major cryptocurrencies.

curl "https://YOUR_RAPIDAPI_HOST/price?coin=bitcoin"
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import requests

response = requests.get(
    "https://YOUR_RAPIDAPI_HOST/price",
    params={"coin": "bitcoin"}
)
data = response.json()
print(f"BTC: ${data['price_usd']:,.2f}")
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Try it on RapidAPI

14. SEO Analyzer API

Audit any website's SEO: meta tags, heading structure, structured data, and an overall score.

curl "https://YOUR_RAPIDAPI_HOST/analyze?url=https://dev.to"
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import requests

response = requests.get(
    "https://YOUR_RAPIDAPI_HOST/analyze",
    params={"url": "https://dev.to"}
)
report = response.json()
print(f"SEO Score: {report['score']}/100")
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Try it on RapidAPI

15. Weather API

Current conditions, hourly and daily forecasts, historical data, and geocoding.

curl "https://YOUR_RAPIDAPI_HOST/current?city=Tokyo"
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import requests

response = requests.get(
    "https://YOUR_RAPIDAPI_HOST/current",
    params={"city": "Tokyo"}
)
weather = response.json()
print(f"{weather['city']}: {weather['temp_c']}C, {weather['description']}")
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16. WHOIS Domain API

RDAP/WHOIS lookup, DNS records, and domain availability checks.

curl "https://YOUR_RAPIDAPI_HOST/lookup?domain=example.com"
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import requests

response = requests.get(
    "https://YOUR_RAPIDAPI_HOST/lookup",
    params={"domain": "example.com"}
)
whois = response.json()
print(f"Registrar: {whois['registrar']}, Expires: {whois['expiry_date']}")
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17. News Aggregator API

Aggregated headlines from BBC, Reuters, Hacker News, Dev.to, and more.

curl "https://YOUR_RAPIDAPI_HOST/top?source=hackernews&limit=5"
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import requests

response = requests.get(
    "https://YOUR_RAPIDAPI_HOST/top",
    params={"source": "hackernews", "limit": 5}
)
for article in response.json()["articles"]:
    print(f"- {article['title']}")
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18. AI Translate API (M2M100)

Translate text across 40+ languages with automatic language detection. Powered by Meta's M2M100 model.

curl -X POST "https://YOUR_RAPIDAPI_HOST/translate" \
  -H "Content-Type: application/json" \
  -d '{"text": "Hello, how are you?", "target": "ja"}'
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import requests

response = requests.post(
    "https://YOUR_RAPIDAPI_HOST/translate",
    json={"text": "Hello, how are you?", "target": "ja"}
)
print(response.json()["translated_text"])  # こんにちは、お元気ですか？
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19. Trends Aggregator API

What's trending right now across Google, Reddit, Hacker News, GitHub, and Product Hunt — in a single call.

curl "https://YOUR_RAPIDAPI_HOST/google/daily?geo=US"
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import requests

response = requests.get(
    "https://YOUR_RAPIDAPI_HOST/google/daily",
    params={"geo": "US"}
)
for trend in response.json()["trends"][:5]:
    print(f"- {trend['title']} ({trend['traffic']})")
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20. Company Data API

Search for businesses by name or enrich a domain with company info and tech stack detection.

curl "https://YOUR_RAPIDAPI_HOST/search?query=stripe&limit=3"
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import requests

response = requests.get(
    "https://YOUR_RAPIDAPI_HOST/search",
    params={"query": "stripe", "limit": 3}
)
for company in response.json()["results"]:
    print(f"{company['name']} - {company['domain']}")
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21. PDF Generator API

Convert HTML, Markdown, or a URL into a downloadable PDF with custom headers and footers.

curl -X POST "https://YOUR_RAPIDAPI_HOST/generate" \
  -H "Content-Type: application/json" \
  -d '{"html": "<h1>Invoice #42</h1><p>Total: $99.00</p>", "format": "A4"}'
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import requests

response = requests.post(
    "https://YOUR_RAPIDAPI_HOST/generate",
    json={"html": "<h1>Invoice #42</h1><p>Total: $99.00</p>", "format": "A4"}
)
with open("invoice.pdf", "wb") as f:
    f.write(response.content)
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22. Placeholder Image API

Generate SVG or PNG placeholder images with gradients, custom text, and category presets (avatar, banner, thumbnail, etc.).

curl "https://YOUR_RAPIDAPI_HOST/400x300?text=Hello+Dev.to&bg=blue&format=svg"
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import requests

response = requests.get(
    "https://YOUR_RAPIDAPI_HOST/400x300",
    params={"text": "Hello Dev.to", "bg": "ocean", "format": "svg"}
)
print(response.text)  # SVG markup
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23. Markdown Converter API

Convert Markdown to HTML (or HTML to Markdown) with GFM support, table of contents generation, and syntax highlighting classes.

curl -X POST "https://YOUR_RAPIDAPI_HOST/convert" \
  -H "Content-Type: application/json" \
  -d '{"markdown": "# Hello\n\nThis is **bold** and `code`.", "toc": true}'
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import requests

response = requests.post(
    "https://YOUR_RAPIDAPI_HOST/convert",
    json={"markdown": "# Hello\n\nThis is **bold** and `code`.", "toc": True}
)
result = response.json()
print(result["html"])
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24. WP Internal Link Optimization API

Analyze your WordPress content and get smart internal link suggestions with anchor text and relevance scoring.

curl -X POST "https://YOUR_RAPIDAPI_HOST/analyze" \
  -H "Content-Type: application/json" \
  -d '{"site_url": "https://yourblog.com", "post_id": 42}'
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import requests

response = requests.post(
    "https://YOUR_RAPIDAPI_HOST/analyze",
    json={"site_url": "https://yourblog.com", "post_id": 42}
)
for link in response.json()["suggestions"]:
    print(f"Link to: {link['target_title']} (score: {link['relevance']})")
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Try it on RapidAPI

Why Cloudflare Workers?

All 24 APIs run on Cloudflare Workers, which means:

  • No cold starts. Workers are always warm and ready.
  • Global edge deployment. Your request hits the nearest of 300+ data centers.
  • Consistent latency. Most responses come back in under 50ms.
  • No server maintenance. I don't manage any infrastructure beyond the code itself.

This is why the free tier is sustainable — Cloudflare's pricing model makes it viable to offer 500 free requests per month without losing money.

Try Them All

Every API listed above has a free tier on RapidAPI. No credit card needed. Just subscribe to the Basic plan and start making requests.

If you find a bug, have a feature request, or just want to say hi — drop a comment below or open an issue. I'm actively maintaining all of these and shipping improvements regularly.

Happy building.

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