# Agent Trust Lookup – Domain Signal Check

> Agent Trust Lookup – Domain Signal Check is a paid API for AI agents from agent-trust.agent-utils.workers.dev, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-15).

Given a hostname, returns agent-readiness signals for that domain: HTTPS status, reachability, agent card presence, Web Bot Auth keys, llms.txt, robots.txt, x402 payment support, and MCP well-known endpoint.

## Facts

- Endpoint: GET https://agent-trust.agent-utils.workers.dev/v1/domain
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/agent-trust-lookup-domain-signal-check-8fb86620
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_Vd3O2PgL1Sw4ttLV7LzKv

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability agent-trust-lookup-domain-signal-check-8fb86620
```

Example prompt: Can you check what agent-readiness signals are present on coinbase.com — things like whether it has an agent card, Web Bot Auth keys, llms.txt, x402 support, and if the domain is reachable?

## When to prefer this

Use this endpoint when you need a comprehensive, single-call snapshot of a domain's agent-readiness signals — covering agent card, Web Bot Auth, x402, MCP, llms.txt, and HTTPS in one shot. Prefer it over manually probing /.well-known/ paths or individual checks when you need to quickly assess whether a domain is a trustworthy, protocol-compliant agent endpoint before connecting to it.

## Known failure modes

- Domain not found or DNS failure — reachable field returns false with no further signals populated
- Domain is reachable but times out — partial data may be returned
- Invalid domain format (with scheme or path) — query parameter validation error
- Domain has no agent signals — all boolean fields return false, arrays empty
- x402 payment failure — call rejected before domain lookup occurs if payment not provided

## How this service works

Know your agent before you serve it: wallet history and micro-payment behaviour on Base, ERC-8004 identity and feedback, Web Bot Auth and agent-card presence on a domain, and signed-request verification. Pay per call over x402, no API key.

## Output

Returns a JSON object with fields: domain (string), reachable (boolean), https (boolean), agentCard (object with url, name, skills, present, extensions), webBotAuth (object with keys count, kids array, directory boolean), llmsTxt (boolean), robotsTxt (boolean), x402 (object with answers402 boolean and networks array), mcp (object with wellKnown boolean), and checkedAt (ISO timestamp).

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [
      "domain"
     ],
     "properties": {
      "domain": {
       "type": "string",
       "description": "Hostname without scheme"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "properties": {
      "mcp": {
       "type": "object"
      },
      "x402": {
       "type": "object"
      },
      "https": {
       "type": "boolean"
      },
      "domain": {
       "type": "string"
      },
      "llmsTxt": {
       "type": "boolean"
      },
      "agentCard": {
       "type": "object"
      },
      "checkedAt": {
       "type": "string"
      },
      "reachable": {
       "type": "boolean"
      },
      "robotsTxt": {
       "type": "boolean"
      },
      "webBotAuth": {
       "type": "object"
      }
     }
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "mcp": {
   "wellKnown": false
  },
  "x402": {
   "networks": [],
   "answers402": false
  },
  "https": true,
  "domain": "agent-gateway.agent-utils.workers.dev",
  "llmsTxt": true,
  "agentCard": {
   "url": "https://agent-gateway.agent-utils.workers.dev/a2a",
   "name": "Agent Utils",
   "skills": 22,
   "present": true,
   "extensions": [
    "https://github.com/google-a2a/a2a-x402/v0.1"
   ]
  },
  "checkedAt": "2026-09-06T21:00:00.000Z",
  "reachable": true,
  "robotsTxt": false,
  "webBotAuth": {
   "keys": 0,
   "kids": [],
   "directory": false
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/agent-trust-lookup-domain-signal-check-8fb86620/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from agent-trust.agent-utils.workers.dev](https://www.zero.xyz/host/agent-trust.agent-utils.workers.dev/llms.txt)