Bastion Helix Agent Lens

Free. Before an agent spends money or time on a URL: is it allowed (robots.txt for this service and, if you pass user_agent, for your own bot; Content Signals such as ai-input and ai-train; meta robots), does a bot check or sign-in stand in the way, and which engine each task needs — plain fetch, Kitesurf (Cloudflare's lightweight agent browser) or Chromium. Rate-limited per IP.

{
  "type": "object",
  "properties": {
    "url": {
      "type": "string",
      "description": "The page (http or https)"
    },
    "user_agent": {
      "type": "string",
      "description": "Your own bot's robots.txt name (e.g. \"MyAgentBot\") to check its rules too"
    }
  },
  "required": [
    "url"
  ]
}

Returns the main content of a web page as clean Markdown with absolute links. Tries the cheapest way that works: plain fetch, then Kitesurf, then Chromium, and reports which one worked. Refuses (and charges nothing) when the site's robots.txt or Content Signals say no, or when a bot check answers instead of the page. Charged only on success. Price: US$0.004 per successful call (API key credits or x402).

{
  "type": "object",
  "properties": {
    "url": {
      "type": "string"
    },
    "engine": {
      "type": "string",
      "enum": [
        "auto",
        "fetch",
        "kitesurf",
        "chromium"
      ],
      "default": "auto"
    },
    "max_chars": {
      "type": "integer",
      "minimum": 1000,
      "maximum": 400000,
      "default": 100000
    },
    "user_agent": {
      "type": "string"
    }
  },
  "required": [
    "url"
  ]
}

Returns the forms (with every field, its label and whether it is required), buttons and links on a page, each with a CSS selector an automation tool can use. Uses the rendered page when the HTML alone has none. Charged only on success. Price: US$0.004 per successful call (API key credits or x402).

{
  "type": "object",
  "properties": {
    "url": {
      "type": "string"
    },
    "engine": {
      "type": "string",
      "enum": [
        "auto",
        "fetch",
        "kitesurf",
        "chromium"
      ],
      "default": "auto"
    },
    "user_agent": {
      "type": "string"
    }
  },
  "required": [
    "url"
  ]
}

No AI model involved: returns the structured data the page already publishes — JSON-LD / schema.org objects (products, articles, events, organisations, breadcrumbs), prices and offers, meta and Open Graph tags, canonical URL, language versions, licence, RSS/Atom/JSON feeds, and HTML data tables as columns + rows. Exact values instead of guesses from text. Charged only on success. Price: US$0.002 per successful call (API key credits or x402).

{
  "type": "object",
  "properties": {
    "url": {
      "type": "string"
    },
    "engine": {
      "type": "string",
      "enum": [
        "auto",
        "fetch",
        "kitesurf",
        "chromium"
      ],
      "default": "auto"
    },
    "user_agent": {
      "type": "string"
    }
  },
  "required": [
    "url"
  ]
}

For pages an agent checks again and again. The first call returns the page as sections plus a fingerprint; send that fingerprint back as "previous" next time and get only the sections that changed (and the headings of removed ones), or changed:false. Uses HTTP ETag/Last-Modified when the site supports them. Nothing is stored on our side: the fingerprint lives with the agent. Saves tokens on every re-check. Charged only on success. Price: US$0.001 per successful call (API key credits or x402).

{
  "type": "object",
  "properties": {
    "url": {
      "type": "string"
    },
    "previous": {
      "type": "object",
      "description": "The \"fingerprint\" object from your last delta call for this URL. Leave out on the first call."
    },
    "engine": {
      "type": "string",
      "enum": [
        "auto",
        "fetch",
        "kitesurf",
        "chromium"
      ],
      "default": "auto"
    },
    "user_agent": {
      "type": "string"
    }
  },
  "required": [
    "url"
  ]
}

Free. Everything an agent should know about a website before using it: its llms.txt (and llms-full.txt), sitemap (page count and first URLs), feeds, language versions, Content Signals, and which known AI crawlers and agents its robots.txt allows. Rate-limited per IP.

{
  "type": "object",
  "properties": {
    "url": {
      "type": "string",
      "description": "Any page of the site"
    },
    "user_agent": {
      "type": "string",
      "description": "Your bot's robots.txt name, to check its rules too"
    }
  },
  "required": [
    "url"
  ]
}

PNG screenshot of a page at 1280×800 (or the full page). engine "auto" uses Kitesurf unless the page needs video or WebGL, then Chromium. Charged only on success. Price: US$0.008 per successful call (API key credits or x402).

{
  "type": "object",
  "properties": {
    "url": {
      "type": "string"
    },
    "engine": {
      "type": "string",
      "enum": [
        "auto",
        "kitesurf",
        "chromium"
      ],
      "default": "auto"
    },
    "full_page": {
      "type": "boolean",
      "default": false
    },
    "user_agent": {
      "type": "string"
    }
  },
  "required": [
    "url"
  ]
}

Free. Credits remaining on the API key sent in the Authorization header (1 credit = US$0.001).

{
  "type": "object",
  "properties": {}
}