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Agent Service · x402 · early usage

Avoid unnecessary browser launches with a lightweight preflight for AI agents

Avoid unnecessary browser launches with a lightweight preflight for AI agents. ZeroWorker inspects public pages before browser automation and returns static forms, field constraints, CAPTCHA/SPA signals, DNS/public-network safety checks, and a 3-state routing…

by zeroworker-web-action-api.zeroworker-lab.workers.dev · discovered, not yet claimed by its owner · updated 2026-09-25

30d calls7
30d payers4
MethodPOST
Outputjson

Mirrored from Coinbase's public x402 Bazaar. The description is the provider's own text and has not been reviewed here; the payment requirements are copied as published.

What it does

Avoid unnecessary browser launches with a lightweight preflight for AI agents. ZeroWorker inspects public pages before browser automation and returns static forms, field constraints, CAPTCHA/SPA signals, DNS/public-network safety checks, and a 3-state routing verdict: http_candidate, browser_likely, or undetermined. Use it to choose direct HTTP or escalate to a browser. No API key required. $0.003 USDC per successful request via x402 on Base Mainnet.

Tags: preflight · forms · ai-agents · web-automation · browser-automation · bazaar

Call contract

Method
POST
Input
json
Output
json
Last paid call
2026-10-09
Input example from Bazaar metadata
{
  "url": "https://example.com/contact"
}
Output example
{
  "agentVerdict": {
    "browserLikelyRequired": false,
    "confidence": "high",
    "reasons": [
      "At least one static GET/POST form can be described from the initial HTML without executing page JavaScript."
    ],
    "verdict": "http_candidate"
  },
  "fetchedAt": "2026-09-23T10:00:00.000Z",
  "finalUrl": "https://example.com/contact",
  "forms": [
    {
      "action": "https://example.com/contact/submit",
      "enctype": "application/x-www-form-urlencoded",
      "fieldCount": 4,
      "fields": [
        {
          "autocomplete": "email",
          "checked": false,
          "disabled": false,
          "id": "contact-email",
          "label": "Email address",
          "max": null,
          "maxLength": 254,
          "min": null,
          "minLength": null,
          "multiple": false,
          "name": "email",
          "options": null,
          "pattern": null,
          "placeholder": "[email protected]",
          "required": true,
          "selectedValues": null,
          "step": null,
          "type": "email",
          "value": ""
        },
        {
          "autocomplete": null,
          "checked": false,
          "disabled": false,
          "id": "plan",
          "label": "Plan",
          "max": null,
          "maxLength": null,
          "min": null,
          "minLength": null,
          "multiple": false,
          "name": "plan",
          "options": [
            {
              "disabled": false,
              "label": null,
              "selected": false,
              "text": "Basic",
              "value": "basic"
            },
            {
              "disabled": false,
              "label": null,
              "selected": true,
              "text": "Pro",
              "value": "pro"
            }
          ],
          "pattern": null,
          "placeholder": null,
          "required": true,
          "selectedValues": [
            "pro"
          ],
          "step": null,
          "type": "select",
          "value": "pro"
        }
      ],
      "hasFileUpload": false,
      "hasPasswordField": false,
      "index": 0,
      "method": "POST",
      "standardHttpSubmission": true,
      "submitControls": 1
    }
  ],
  "http": {
    "contentType": "text/html; charset=utf-8",
    "redirectCount": 0,
    "status": 200
  },
  "limitations": [
    "Static initial HTML only; page JavaScript is not executed.",
    "Use agentVerdict.verdict for the preferred three-state routing result; browserLikelyRequired remains for backward compatibility and false can also mean undetermined.",
    "This service inspects structure only and does not submit forms or perform actions."
  ],
  "networkSafety": {
    "fetchDnsChecks": 2,
    "initialDnsCheck": {
      "addressCount": 2,
      "allPublic": true,
      "families": [
        4,
        6
      ]
    },
    "postFetchDnsPublicRecheck": true,
    "redirectTargetsRechecked": true
  },
  "page": {
    "captchaMarkers": [],
    "formsFound": 1,
    "iframeCount": 0,
    "scriptCount": 2,
    "spaMarkers": []
  },
  "requestedUrl": "https://example.com/contact"
}

Use with an agent

  1. Discover. Agents find this listing with GET https://bazaar.saylorinnovations.com/discovery/search?query=…, the MCP tool search_resources, or /discovery/resources.
  2. Inspect. Fetch /resources/38428.json for the price and payment options.
  3. Pay. Call GET https://zeroworker-web-action-api.zeroworker-lab.workers.dev/v1/preflight. The provider answers 402 with its payment requirements. An x402 client signs one of the options below and retries with PAYMENT-SIGNATURE.
  4. Execute. The provider returns 200 with the data. Agent Bazaar is not in the request path and never sees your payment.

For humans

You don't need an account or an API key; you need a wallet holding a small amount of USDC on Base, and an x402-capable client (see the examples below). Call the endpoint unpaid first to see exactly what it asks for.

Pricing & payment

Price
$0.003 / request
Protocol
x402 v2
Auth
No account or API key. Pay per request.
Networks
Base
Demand
7 calls · 4 unique payers in 30d (public x402 Bazaar data)

x402 payment requirements

SchemeNetworkAssetAmountPay toTimeout
exactBase
eip155:8453		USDC$0.0030xad277cf8B5D9fa5008D06cBdBE349F5DF3c0Cc8f300s
accepts[] (raw JSON)
[
  {
    "scheme": "exact",
    "network": "eip155:8453",
    "payTo": "0xad277cf8B5D9fa5008D06cBdBE349F5DF3c0Cc8f",
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "amount": "3000",
    "amountUsd": 0.003,
    "maxTimeoutSeconds": 300
  }
]

Schemas

Output schema (JSON Schema)
{
  "properties": {
    "example": {
      "properties": {
        "agentVerdict": {
          "properties": {
            "browserLikelyRequired": {
              "description": "Backward-compatible boolean. True only for browser_likely; false also covers undetermined.",
              "type": "boolean"
            },
            "confidence": {
              "enum": [
                "low",
                "medium",
                "high"
              ],
              "type": "string"
            },
            "reasons": {
              "items": {
                "type": "string"
              },
              "type": "array"
            },
            "verdict": {
              "description": "Preferred three-state routing result. Use this instead of inferring direct-HTTP suitability from browserLikelyRequired=false.",
              "enum": [
                "http_candidate",
                "browser_likely",
                "undetermined"
              ],
              "type": "string"
            }
          },
          "required": [
            "verdict",
            "browserLikelyRequired",
            "confidence",
            "reasons"
          ],
          "type": "object"
        },
        "fetchedAt": {
          "type": "string"
        },
        "finalUrl": {
          "type": "string"
        },
        "forms": {
          "items": {
            "additionalProperties": true,
            "type": "object"
          },
          "type": "array"
        },
        "http": {
          "properties": {
            "contentType": {
              "type": "string"
            },
            "redirectCount": {
              "minimum": 0,
              "type": "integer"
            },
            "status": {
              "type": "integer"
            }
          },
          "required": [
            "status",
            "contentType",
            "redirectCount"
          ],
          "type": "object"
        },
        "limitations": {
          "items": {
            "type": "string"
          },
          "type": "array"
        },
        "networkSafety": {
          "properties": {
            "fetchDnsChecks": {
              "minimum": 2,
              "type": "integer"
            },
            "initialDnsCheck": {
              "properties": {
                "addressCount": {
                  "minimum": 1,
                  "type": "integer"
                },
                "allPublic": {
                  "type": "boolean"
                },
                "families": {
                  "items": {
                    "enum": [
                      4,
                      6
                    ],
                    "type": "integer"
                  },
                  "type": "array"
                }
              },
              "required": [
                "addressCount",
                "families",
                "allPublic"
              ],
              "type": "object"
            },
            "postFetchDnsPublicRecheck": {
              "type": "boolean"
            },
            "redirectTargetsRechecked": {
              "type": "boolean"
            }
          },
          "required": [
            "initialDnsCheck",
            "fetchDnsChecks",
            "redirectTargetsRechecked",
            "postFetchDnsPublicRecheck"
          ],
          "type": "object"
        },
        "page": {
          "properties": {
            "captchaMarkers": {
              "items": {
                "type": "string"
              },
              "type": "array"
            },
            "formsFound": {
              "minimum": 0,
              "type": "integer"
            },
            "iframeCount": {
              "minimum": 0,
              "type": "integer"
            },
            "scriptCount": {
              "minimum": 0,
              "type": "integer"
            },
            "spaMarkers": {
              "items": {
                "type": "string"
              },
              "type": "array"
            }
          },
          "required": [
            "formsFound",
            "scriptCount",
            "iframeCount",
            "spaMarkers",
            "captchaMarkers"
          ],
          "type": "object"
        },
        "requestedUrl": {
          "type": "string"
        }
      },
      "required": [
        "requestedUrl",
        "finalUrl",
        "fetchedAt",
        "http",
        "networkSafety",
        "page",
        "forms",
        "agentVerdict",
        "limitations"
      ],
      "type": "object"
    },
    "type": {
      "type": "string"
    }
  },
  "required": [
    "type"
  ],
  "type": "object"
}
Example shape — generated from the schema, not a captured live response
{
  "example": {
    "agentVerdict": {
      "browserLikelyRequired": true,
      "confidence": "low",
      "reasons": [
        "string"
      ],
      "verdict": "http_candidate"
    },
    "fetchedAt": "string",
    "finalUrl": "string",
    "forms": [
      {}
    ],
    "http": {
      "contentType": "string",
      "redirectCount": 0,
      "status": 0
    },
    "limitations": [
      "string"
    ],
    "networkSafety": {
      "fetchDnsChecks": 0,
      "initialDnsCheck": {
        "addressCount": 0,
        "allPublic": true,
        "families": [
          4
        ]
      },
      "postFetchDnsPublicRecheck": true,
      "redirectTargetsRechecked": true
    },
    "page": {
      "captchaMarkers": [
        "string"
      ],
      "formsFound": 0,
      "iframeCount": 0,
      "scriptCount": 0,
      "spaMarkers": [
        "string"
      ]
    },
    "requestedUrl": "string"
  },
  "type": "string"
}

Examples

curl
curl "https://zeroworker-web-action-api.zeroworker-lab.workers.dev/v1/preflight"
# -> 402 Payment Required, accepts[] lists how to pay
# retry with a PAYMENT-SIGNATURE (or PAYMENT header) once paid
JavaScript
const res = await fetch("https://zeroworker-web-action-api.zeroworker-lab.workers.dev/v1/preflight");
if (res.status === 402) {
  const { accepts } = await res.json();
  // pay one of accepts[] via an x402 client, then retry with the payment header
}
Python
import httpx
res = httpx.get("https://zeroworker-web-action-api.zeroworker-lab.workers.dev/v1/preflight")
if res.status_code == 402:
    accepts = res.json()["accepts"]
    # pay one of accepts[] via an x402 client, then retry with the payment header

Details

Provider
zeroworker-web-action-api.zeroworker-lab.workers.dev
Endpoint
https://zeroworker-web-action-api.zeroworker-lab.workers.dev/v1/preflight
Machine-readable
/resources/38428.json