DiffiCat

{
  "protocolVersion": "0.3.0",
  "name": "DiffiCat",
  "description": "Compares a website against another copy of it on page existence, content and visual regression, page by page with screenshots of the changed regions: a migration, redesign, relaunch, staging-versus-production or new-host check. Free up to 40 comparison pages, 5 page discoveries and 5 screenshots a day per client address with no key or account; beyond that a prepaid key, a Pro account key or an HTTP 402 payment in USDC on Base.",
  "url": "https://app.difficat.com/mcp",
  "preferredTransport": "MCP",
  "provider": {
    "organization": "DiffiCat",
    "url": "https://difficat.com"
  },
  "version": "3.126.0",
  "documentationUrl": "https://difficat.com/agents",
  "iconUrl": "https://difficat.com/assets/favicon.ico",
  "capabilities": {
    "streaming": false,
    "pushNotifications": true,
    "stateTransitionHistory": false
  },
  "securitySchemes": {
    "prepaidKey": {
      "type": "http",
      "scheme": "bearer",
      "description": "A prepaid key (dck_\u2026) a human funds by card, or a Pro account key. Not needed within the free allowance."
    }
  },
  "security": [],
  "defaultInputModes": [
    "application/json",
    "text/plain"
  ],
  "defaultOutputModes": [
    "application/json",
    "text/plain",
    "image/png"
  ],
  "skills": [
    {
      "id": "discover_pages",
      "name": "Discover pages",
      "description": "Lists the pages of a site and the matching page on the other copy, from the sitemap and a crawl.",
      "tags": [
        "sitemap",
        "crawl",
        "url-mapping"
      ]
    },
    {
      "id": "capture_screenshot",
      "name": "Capture screenshot",
      "description": "Takes a full-page screenshot of one URL at a chosen viewport.",
      "tags": [
        "screenshot",
        "capture"
      ]
    },
    {
      "id": "start_comparison",
      "name": "Compare two sites",
      "description": "Runs a page-by-page comparison of two origins or a list of page pairs: existence, content and visual diff, with a per-page report and diff images.",
      "tags": [
        "migration",
        "visual-regression",
        "content-diff",
        "qa"
      ],
      "examples": [
        "Did anything break or change on staging compared with production?"
      ]
    },
    {
      "id": "compare_snapshot",
      "name": "Compare against a snapshot",
      "description": "Compares a live site, or another snapshot, against a snapshot captured earlier.",
      "tags": [
        "snapshot",
        "baseline",
        "regression"
      ]
    }
  ],
  "additionalInterfaces": [
    {
      "url": "https://app.difficat.com/api/v1",
      "transport": "REST",
      "openapi": "https://app.difficat.com/api/v1/openapi.json"
    }
  ]
}