Developer API

Pay as you go

Buy a credit pack, get your API key instantly. Every scan runs a real AI analysis, so there is no free tier — the $10 pack is the smallest way in.

Monthly plans

For sustained volume — cheaper per scan than pay-as-you-go. First month free. Billing starts month 2. All plans require a 6 or 12-month commitment.

Quick start

curl -X POST https://cautellus.com/api/v1/scan \
  -H "Authorization: Bearer ctl_live_YOUR_KEY" \
  -H "Content-Type: application/json" \
  -d '{"input": "paypal-verify-login.xyz", "type": "url"}'

curl -X POST https://cautellus.com/api/v1/scan \
  -H "Authorization: Bearer ctl_live_YOUR_KEY" \
  -H "Content-Type: application/json" \
  -d '{"input": "Your package could not be delivered. Verify: bit.ly/3xScam", "type": "text"}'

{
  "verdict": "danger",
  "score": 92,
  "summary": "This is a phishing site impersonating PayPal.",
  "flags": [
    { "label": "Brand impersonation (PayPal)", "severity": "danger" },
    { "label": "Domain registered 3 days ago", "severity": "danger" },
    { "label": "Suspicious TLD (.xyz)", "severity": "warn" }
  ],
  "meta": {
    "scansUsed": 14,
    "scansLimit": 0,
    "tier": "payg",
    "creditsRemaining": 36
  }
}

API Reference

MCP server for AI agents

Give your AI agent a scam-detection guardrail. The Cautellus MCP server exposes scan_url, scan_message, and get_usage as tools your agent can call before it clicks a link, replies to a message, or moves money. Same key, same credits — each scan costs 1 credit (get_usage is free).

https://cautellus.com/api/mcp

claude mcp add --transport http cautellus https://cautellus.com/api/mcp \
  --header "Authorization: Bearer ctl_live_YOUR_KEY"

{
  "mcpServers": {
    "cautellus": {
      "type": "http",
      "url": "https://cautellus.com/api/mcp",
      "headers": { "Authorization": "Bearer ctl_live_YOUR_KEY" }
    }
  }
}

Error codes

Use cases