I Built a Free AI API With 26 Endpoints — No API Key Needed

Navneet Reddy — Thu, 02 Apr 2026 21:35:24 +0000

Free REST API with AI text generation, translation, code explanation, SQL from English, and more. Runs on Cloudflare Workers. Zero cost.

I got tired of needing API keys and paid plans just to prototype with AI. So I built DevToolBox API — a completely free REST API with 26 endpoints, including 8 AI-powered ones. No authentication, no signup, no rate limit gotchas.

API: devtoolbox-api.devtoolbox-api.workers.dev

Playground: devtoolboxes.uk/ai-playground

What it does

AI Endpoints (free, no auth)

# Generate text
curl -X POST https://devtoolbox-api.devtoolbox-api.workers.dev/ai/generate \
  -H "Content-Type: application/json" \
  -d '{"prompt": "Write a Python function to check if a number is prime"}'

# Translate to any language
curl -X POST .../ai/translate \
  -d '{"text": "Hello, how are you?", "target_lang": "ja"}'
# → {"translated": "こんにちは、お元気ですか?"}

# Explain code
curl -X POST .../ai/explain-code \
  -d '{"code": "const result = arr.filter(x => x > 5).map(x => x * 2).reduce((a,b) => a+b, 0);"}'

# Generate SQL from English
curl -X POST .../ai/sql \
  -d '{"description": "Get top 10 users by order count with total spending"}'

# Generate regex from description
curl -X POST .../ai/regex \
  -d '{"description": "match email addresses ending in .com or .org"}'

# Fix buggy code
curl -X POST .../ai/fix-code \
  -d '{"code": "function add(a, b) { return a - b; }", "error": "returns wrong result"}'

# Summarize text
curl -X POST .../ai/summarize \
  -d '{"text": "Your long text here..."}'

# Generate JSON Schema from example
curl -X POST .../ai/json-schema \
  -d '{"json": {"name": "John", "age": 30, "emails": ["john@example.com"]}}'

Utility Endpoints (also free, also no auth)

# URL shortener
curl -X POST .../shorten -d '{"url": "https://example.com"}'

# Generate UUID
curl https://devtoolbox-api.devtoolbox-api.workers.dev/uuid

# Hash text
curl ".../hash?text=hello&algo=sha256"

# Get your IP info
curl .../ip

# Placeholder images (SVG)
curl .../placeholder/400/200?text=Hello

# Random fake user
curl .../random/user

# And more: /timestamp, /password, /lorem, /encode/base64, /decode/base64, /urlencode, /urldecode, /random/string, /random/number, /random/color, /qr

How I built it

The entire thing runs on Cloudflare Workers (free tier):

Workers AI powers the AI endpoints (Llama 3.2 for text gen, m2m100 for translation, BART for summarization)
Workers KV stores shortened URLs
Edge network means fast responses globally
Total cost: $0/month

The AI endpoints use Cloudflare's free 10,000 neurons/day allocation, which handles ~500-1000 AI requests daily.

Web Tools Too

I also built devtoolboxes.uk with 15 browser-based developer tools:

JSON Formatter & Validator
Regex Tester
JWT Decoder
Base64 Encoder/Decoder
Unix Timestamp Converter
Diff Checker
Case Converter (camelCase, snake_case, kebab-case)
Color Converter (HEX, RGB, HSL)
And more...

All client-side, no data leaves your browser.

Try the AI Playground

If you want to test the AI features without curl, there's an interactive playground at devtoolboxes.uk/ai-playground — generate text, translate, explain code, summarize, and create regex patterns right in your browser.

DEV Community: Navneet Reddy