# NEXUS LLMs.txt Audit

> NEXUS LLMs.txt Audit is a paid API for AI agents from nexus-agent-xa12.onrender.com, paid per call via x402, $0.08/call, status unknown (last checked 2026-09-14).

Checks whether a given company website has an llms.txt or llms-full.txt file deployed and returns its contents along with a deployment recommendation.

## Facts

- Endpoint: GET https://nexus-agent-xa12.onrender.com/util/llms-audit
- Price: $0.08/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/nexus-llms-txt-audit-49616c94
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_tBsnSMBA-qR77Rok8G2yi

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 nexus-llms-txt-audit-49616c94
```

Example prompt: Can you check whether openai.com has an llms.txt or llms-full.txt file deployed and tell me what it says and whether they should add one?

## When to prefer this

Use this endpoint when you need to programmatically check whether a specific company website has adopted the llms.txt standard for AI agent discoverability. Prefer this over manual inspection or generic web scrapers when you want a structured response with deployment recommendations and full content retrieval in one call.

## Known failure modes

- URL not reachable — returns error or empty result if the domain is offline or unreachable
- No llms.txt found — has_llms_txt returns false with empty content fields
- Invalid URL format — request rejected if the url parameter is not a valid root domain URL
- Payment failure — x402 USDC payment not completed, request blocked
- Rate limiting or timeout on the target domain — partial or failed fetch

## How this service works

Pay-per-call financial data. Streamable HTTP MCP. x402 USDC on Base. Not financial advice.

## Output

Returns the root URL audited, whether an llms.txt was found (boolean), the content of llms.txt if present, the content of llms-full.txt if present, and a recommendation string advising on deployment (e.g. 'Deploy at /llms.txt').

## 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",
      "HEAD",
      "DELETE"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [
      "url"
     ],
     "properties": {
      "url": {
       "type": "string",
       "description": "https://company.com root URL"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "url": "https://example.com",
  "source": "NEXUS",
  "llms_txt": "# Example\\n...",
  "has_llms_txt": false,
  "llms_full_txt": "# Extended...",
  "recommendation": "Deploy at /llms.txt"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/nexus-llms-txt-audit-49616c94/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from nexus-agent-xa12.onrender.com](https://www.zero.xyz/host/nexus-agent-xa12.onrender.com/llms.txt)