Load the full page and measure time-to-first-byte, total load time, and downloaded size (c

[
  {
    "scheme": "exact",
    "network": "eip155:8453",
    "payTo": "0x05a877EF93E7818828D199E2Df0028bca3C75bf0",
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "amount": "30000",
    "maxTimeoutSeconds": 60
  }
]

{
  "bazaar": {
    "info": {
      "input": {
        "body": {
          "url": "https://example.com"
        },
        "bodyType": "json",
        "method": "POST",
        "type": "http"
      },
      "output": {
        "example": {
          "check": "perf",
          "network": "eip155:8453",
          "result": {
            "contentSize": 51200,
            "error": null,
            "loadTimeMs": 318,
            "status": "UP",
            "ttfbMs": 92,
            "url": "https://example.com/",
            "warning": null
          }
        },
        "type": "json"
      }
    },
    "schema": {
      "$schema": "https://json-schema.org/draft/2020-12/schema",
      "properties": {
        "input": {
          "additionalProperties": false,
          "properties": {
            "body": {
              "properties": {
                "url": {
                  "description": "Full http(s) URL of the site to check, e.g. \"https://example.com\". Must resolve to a public address — private, loopback, link-local, and cloud-metadata targets are rejected with HTTP 400 before any payment.",
                  "type": "string"
                }
              },
              "required": [
                "url"
              ]
            },
            "bodyType": {
              "enum": [
                "json",
                "form-data",
                "text"
              ],
              "type": "string"
            },
            "method": {
              "enum": [
                "POST",
                "PUT",
                "PATCH"
              ],
              "type": "string"
            },
            "type": {
              "const": "http",
              "type": "string"
            }
          },
          "required": [
            "type",
            "method",
            "bodyType",
            "body"
          ],
          "type": "object"
        },
        "output": {
          "properties": {
            "example": {
              "properties": {
                "check": {
                  "const": "perf",
                  "description": "Identifies which check produced this result."
                },
                "network": {
                  "description": "CAIP-2 id of the chain the payment settled on (e.g. eip155:8453 = Base).",
                  "type": "string"
                },
                "result": {
                  "properties": {
                    "contentSize": {
                      "description": "Bytes downloaded (capped at 5,242,880 = 5 MB).",
                      "type": [
                        "integer",
                        "null"
                      ]
                    },
                    "error": {
                      "description": "Human-readable failure reason, or null on success.",
                      "type": [
                        "string",
                        "null"
                      ]
                    },
                    "loadTimeMs": {
                      "description": "Total time to download the page body (up to the 5 MB cap), in milliseconds.",
                      "type": [
                        "integer",
                        "null"
                      ]
                    },
                    "status": {
                      "description": "UP = loaded within threshold; WARN = slow (over the load-time threshold); DOWN = failed or timed out.",
                      "enum": [
                        "UP",
                        "WARN",
                        "DOWN"
                      ],
                      "type": "string"
                    },
                    "ttfbMs": {
                      "description": "Time to first byte, in milliseconds.",
                      "type": [
                        "integer",
                        "null"
                      ]
                    },
                    "url": {
                      "description": "The normalized URL that was checked.",
                      "type": "string"
                    },
                    "warning": {
                      "description": "Human-readable warning when the check passed but a threshold was crossed, else null.",
                      "type": [
                        "string",
                        "null"
                      ]
                    }
                  },
                  "type": "object"
                }
              },
              "type": "object"
            },
            "type": {
              "type": "string"
            }
          },
          "required": [
            "type"
          ],
          "type": "object"
        }
      },
      "required": [
        "input"
      ],
      "type": "object"
    }
  }
}

curl "https://x402.cloudpulsepoint.com/agent/check/perf"
# -> 402 Payment Required, accepts[] lists how to pay
# retry with a PAYMENT-SIGNATURE (or PAYMENT header) once paid

const res = await fetch("https://x402.cloudpulsepoint.com/agent/check/perf");
if (res.status === 402) {
  const { accepts } = await res.json();
  // pay one of accepts[] via an x402 client, then retry with the payment header
}

import httpx
res = httpx.get("https://x402.cloudpulsepoint.com/agent/check/perf")
if res.status_code == 402:
    accepts = res.json()["accepts"]
    # pay one of accepts[] via an x402 client, then retry with the payment header