{ try it }

{
  "url": "https://www.python.org/",
  "keywords": [
    "python"
  ]
}

{
  "type": "object",
  "properties": {
    "skill": {
      "type": "string"
    },
    "version": {
      "type": "string"
    },
    "url": {
      "type": "string"
    },
    "final_url": {
      "type": "string"
    },
    "score": {
      "type": "number"
    },
    "grade": {
      "type": "string"
    },
    "subscores": {
      "type": "object",
      "properties": {
        "technical": {
          "type": "integer"
        },
        "content": {
          "type": "integer"
        },
        "metadata": {
          "type": "integer"
        },
        "structured_data": {
          "type": "integer"
        },
        "aeo": {
          "type": "integer"
        }
      }
    },
    "checks": {
      "type": "array",
      "items": {
        "type": "object",
        "properties": {
          "id": {
            "type": "string"
          },
          "category": {
            "type": "string"
          },
          "pass": {
            "type": "boolean"
          },
          "severity": {
            "type": "string"
          },
          "points": {
            "type": "number"
          },
          "max": {
            "type": "integer"
          },
          "evidence": {
            "type": "string"
          },
          "fix": {
            "type": "object"
          }
        }
      }
    },
    "top_fixes": {
      "type": "array",
      "items": {
        "type": "object",
        "properties": {
          "check_id": {
            "type": "string"
          },
          "impact_points": {
            "type": "number"
          },
          "summary": {
            "type": "string"
          }
        }
      }
    },
    "generated": {
      "type": "object",
      "properties": {
        "meta_tags_html": {
          "type": "string"
        }
      }
    },
    "reason": {
      "type": "null"
    },
    "disclaimer": {
      "type": "string"
    }
  },
  "required": [
    "skill"
  ]
}

{
  "skill": "seo_v2",
  "version": "2.0",
  "url": "https://www.python.org/",
  "final_url": "https://www.python.org/",
  "score": 77.7,
  "grade": "C",
  "subscores": {
    "technical": 80,
    "content": 90,
    "metadata": 62,
    "structured_data": 83,
    "aeo": 72
  },
  "checks": [
    {
      "id": "canonical",
      "category": "technical",
      "pass": false,
      "severity": "medium",
      "points": 0.0,
      "max": 5,
      "evidence": "no rel=canonical",
      "fix": {
        "summary": "Use exactly one absolute, self-referencing canonical on the same host.",
        "snippet": "<link rel=\"canonical\" href=\"https://www.python.org/\">",
        "snippet_lang": "html",
        "effort": "S"
      }
    },
    {
      "id": "h1",
      "category": "content",
      "pass": false,
      "severity": "medium",
      "points": 3.0,
      "max": 5,
      "evidence": "5 H1 elements",
      "fix": {
        "summary": "Use exactly one H1 that states the page topic in the same words as the title.",
        "snippet": "<h1>Functions Defined</h1>",
        "snippet_lang": "html",
        "effort": "S"
      }
    },
    {
      "id": "title",
      "category": "metadata",
      "pass": false,
      "severity": "medium",
      "points": 3.0,
      "max": 6,
      "evidence": "title 21 chars: 'Welcome to Python.org'",
      "fix": {
        "summary": "Use one <title> of 30-60 characters that names the page topic.",
        "snippet": "<title>Welcome to</title>",
        "snippet_lang": "html",
        "effort": "S"
      }
    }
  ],
  "top_fixes": [
    {
      "check_id": "canonical",
      "impact_points": 5.0,
      "summary": "Use exactly one absolute, self-referencing canonical on the same host."
    },
    {
      "check_id": "title",
      "impact_points": 3.0,
      "summary": "Use one <title> of 30-60 characters that names the page topic."
    },
    {
      "check_id": "meta_description",
      "impact_points": 2.5,
      "summary": "Write a 70-160 character meta description from the page's own text."
    }
  ],
  "generated": {
    "meta_tags_html": "<title>Welcome to</title>\n<meta name=\"description\" content=\"Notice: This page displays a fallback because interactive scripts did not run.\">\n<link rel=\"canonical\" href=\"https://www.python.org/\">"
  },
  "reason": null,
  "disclaimer": "Scores reflect technical checks only; no ranking or citation is guaranteed."
}

1. POST https://grokzilla.shop/api/skills/seo-v2 with the JSON body, no payment header
2. ← 402 Payment Required + PAYMENT-REQUIRED header: base64 JSON {x402Version: 2, accepts: [{scheme: "exact", network: "eip155:8453", asset: USDC, amount: "99700", payTo}]} (same JSON in the body)
3. your x402 client checks amount ≤ $0.0997 and signs a USDC transfer authorization to payTo with your wallet
4. retry the same POST with PAYMENT-SIGNATURE: <base64> (x402 v2) or X-PAYMENT (v1 clients)
5. ← 200 OK with the result JSON + PAYMENT-RESPONSE header (base64 settlement receipt, tx hash on Base)