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Ozor
Ozor

Posted on • Originally published at api-catalog-three.vercel.app

I Built a Gateway That Gives You 39 APIs with One Key

#webdev #programming #tutorial #api

I got tired of managing dozens of API keys across different services. So I built an API gateway that wraps 39 services behind a single key.

No signups. No credit cards. No OAuth flows. You create a key with one POST request and start calling APIs immediately.

Here's what's available and how to use it.

Get Your Key (10 seconds) 

curl -X POST https://agent-gateway-kappa.vercel.app/api/keys/create
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Response:

{
  "key": "gw_abc123...",
  "credits": 200,
  "expires_in": "30 days",
  "note": "200 free credits (expires in 30 days). Top up with USDC on Base to get more."
}
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That's it. 200 free API calls, no email required.

What You Can Do

Every service lives under /v1/{service-name}/. Here are the ones I use most:

1. GeoIP Lookup 

curl "https://agent-gateway-kappa.vercel.app/v1/agent-geo/geo/8.8.8.8" \
  -H "Authorization: Bearer YOUR_KEY"
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Returns country, city, ISP, timezone, lat/lng. Works with any IP.

2. Live Crypto Prices (500+ tokens) 

curl "https://agent-gateway-kappa.vercel.app/v1/defi-trading/prices" \
  -H "Authorization: Bearer YOUR_KEY"
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Real-time prices for BTC, ETH, SOL, and 500+ tokens from multiple DEXes.

3. Website Screenshots 

curl -X POST "https://agent-gateway-kappa.vercel.app/v1/agent-screenshot/screenshot" \
  -H "Authorization: Bearer YOUR_KEY" \
  -H "Content-Type: application/json" \
  -d '{"url": "https://example.com", "viewport": "desktop"}'
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Renders any URL in a real browser and returns a screenshot. Supports desktop, tablet, and mobile viewports.

4. DNS Lookup 

curl "https://agent-gateway-kappa.vercel.app/v1/agent-dns/resolve/google.com" \
  -H "Authorization: Bearer YOUR_KEY"
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A, AAAA, MX, TXT, NS records — everything you need.

5. Run Code Remotely 

curl -X POST "https://agent-gateway-kappa.vercel.app/v1/agent-coderunner/execute" \
  -H "Authorization: Bearer YOUR_KEY" \
  -H "Content-Type: application/json" \
  -d '{"language": "python", "code": "print(sum(range(100)))"}'
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Sandboxed execution for Python, JavaScript, and more. Great for AI agents that need to run code.

6. Web Scraping 

curl -X POST "https://agent-gateway-kappa.vercel.app/v1/agent-scraper/scrape" \
  -H "Authorization: Bearer YOUR_KEY" \
  -H "Content-Type: application/json" \
  -d '{"url": "https://news.ycombinator.com", "format": "markdown"}'
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Extracts content from any webpage. Returns clean markdown, HTML, or JSON.

7. PDF Generation 

curl -X POST "https://agent-gateway-kappa.vercel.app/v1/agent-pdfgen/generate" \
  -H "Authorization: Bearer YOUR_KEY" \
  -H "Content-Type: application/json" \
  -d '{"html": "<h1>Invoice #001</h1><p>Total: $100</p>"}'
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Render HTML to PDF. Works with CSS, images, and full page layouts.

8. URL Shortener 

curl -X POST "https://agent-gateway-kappa.vercel.app/v1/agent-shorturl/shorten" \
  -H "Authorization: Bearer YOUR_KEY" \
  -H "Content-Type: application/json" \
  -d '{"url": "https://example.com/very/long/url"}'
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And 31 More...

The full list: crypto wallets (9 chains), on-chain analytics, DeFi data, smart contract deployment, secret management, event bus, file storage, webhook testing, image processing, email sending, task scheduling, AI/LLM proxy, text transformation, identity verification, and more.

Browse all 39: API Catalog

How Pricing Works

  • Free: 200 credits (1 credit = 1 API call). No signup, no email.
  • Paid: Top up with USDC on Base chain or Monero (XMR). $1 = 1,000 credits.
  • AI agents: Supports x402 protocol for automatic per-request payments.

Check your balance anytime:

curl "https://agent-gateway-kappa.vercel.app/api/keys/balance" \
  -H "Authorization: Bearer YOUR_KEY"
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Building an AI Agent with This

Here's a minimal Python agent that can answer questions using web scraping and code execution:

import requests

API = "https://agent-gateway-kappa.vercel.app"
KEY = "gw_your_key_here"
headers = {"Authorization": f"Bearer {KEY}"}

def scrape(url):
    """Fetch and extract content from any URL"""
    r = requests.post(f"{API}/v1/agent-scraper/scrape",
        headers=headers,
        json={"url": url, "format": "markdown"})
    return r.json()

def run_code(code, lang="python"):
    """Execute code in a sandbox"""
    r = requests.post(f"{API}/v1/agent-coderunner/execute",
        headers=headers,
        json={"language": lang, "code": code})
    return r.json()

def get_price(token):
    """Get live crypto price"""
    r = requests.get(f"{API}/v1/defi-trading/price/{token}",
        headers=headers)
    return r.json()

# Example: scrape HN, then analyze with code
hn = scrape("https://news.ycombinator.com")
analysis = run_code(f"""
data = '''{hn.get('content', '')[:2000]}'''
lines = [l for l in data.split('\\n') if l.strip()]
print(f'Found {len(lines)} content lines')
print('First 5 items:')
for line in lines[:5]:
    print(f'  - {line[:80]}')
""")
print(analysis)
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The Architecture

The gateway is a Fastify server that proxies requests to 39 microservices running on the same machine. Each service has its own port, its own logic, and its own health check. The gateway handles:

  • Authentication: One key for everything
  • Rate limiting: 300 req/min for keyed users, 60/min for free tier
  • Credit tracking: Deducts 1 credit per request, persists to disk
  • Health monitoring: Auto-detects and routes around failed services

All services are independently deployable. If one goes down, the other 38 keep working.

Links

If you try it out, I'd love to hear which services are most useful to you. Happy to take feature requests too.

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