# agentx.sale Site Agent-Readiness Verdict Card

> agentx.sale Site Agent-Readiness Verdict Card is a paid API for AI agents from agentx.sale, paid per call via x402, $0.02/call, status unknown (last checked 2026-10-21).

Grades a domain's agent-facing infrastructure (llms.txt, A2A, MCP card, OpenAPI), TLS, security headers, and AI-crawler policy into a single readiness verdict card

## Facts

- Endpoint: GET https://agentx.sale/x402/agent-card?utm_source=zero.xyz
- Price: $0.02/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-21
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/agentx-sale-site-agent-readiness-verdict-card-85d2bb3a
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_ARR6wtplffgQPFXu4aqTE

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 agentx-sale-site-agent-readiness-verdict-card-85d2bb3a
```

Example prompt: Can you check how agent-ready example.com is — I want to see if it has llms.txt, an MCP card, A2A support, OpenAPI, proper TLS, and whether it blocks AI crawlers like GPTBot?

## When to prefer this

Choose this endpoint when you need a single comprehensive verdict on whether a domain is ready to be called by or interacted with by AI agents — specifically covering the full stack of llms.txt, A2A, MCP card, OpenAPI, TLS, headers, and AI-crawler policy in one call. Prefer this over individual protocol-specific checks (like the A2A lint endpoint or TLS-only card) when you want a holistic readiness grade rather than deep linting of a single artifact.

## Known failure modes

- Missing required 'host' query parameter returns validation error
- Unreachable or non-existent domain results in DNS/connection failure response
- Domain with no agent-facing files returns low-grade verdict with all flags absent
- TLS errors on the target domain are reported as part of the grade rather than causing endpoint failure
- Rate limiting or upstream timeout may cause delayed or error response

## How this service works

Site Agent-Readiness Verdict Card: grade a domain's agent-facing files (llms.txt, A2A, MCP card, OpenAPI), TLS, headers and AI-crawler policy

## Output

A structured verdict card containing grades and presence/absence flags for agent-facing files (llms.txt, A2A agent.json, MCP server card, OpenAPI spec), TLS certificate health, HTTP security headers, and AI-crawler policy (e.g. whether GPTBot or ClaudeBot are allowed or blocked), aggregated into an overall agent-readiness score or verdict.

## 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": [
      "host"
     ],
     "properties": {
      "host": {
       "type": "string"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "host": "example.com",
  "grade": "B",
  "llms_txt": true,
  "crawler_policy": true
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/agentx-sale-site-agent-readiness-verdict-card-85d2bb3a/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from agentx.sale](https://www.zero.xyz/host/agentx.sale/llms.txt)