# Model Access Gateway – Grok 4.7 Chat Completions

> Model Access Gateway – Grok 4.7 Chat Completions is a paid API for AI agents from agent402-arb.rosariovitale0096.workers.dev, paid per call via x402, $0.0091/call, status unknown (last checked 2026-10-15).

Provides OpenAI-compatible chat completions via xAI's Grok 4.7 model, paid per request in USDC on Base using the x402 payment protocol — no account or API key required.

## Facts

- Endpoint: POST https://agent402-arb.rosariovitale0096.workers.dev/llm/grok-4.7?utm_source=zero.xyz
- Price: $0.0091/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/model-access-gateway-grok-4-7-chat-completions-2c54b3e3
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_xg1K25rv7fR21dnvE6fbg

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 model-access-gateway-grok-4-7-chat-completions-2c54b3e3 -d '<json body>'
```

Example prompt: Using the Grok 4.7 pay-per-request gateway, send a chat message asking 'What are the three laws of thermodynamics?' and return the assistant's response — pay the 0.0014 USDC fee automatically via x402 on Base.

## When to prefer this

Choose this endpoint when you need Grok 4.7 specifically (xAI's model) via an OpenAI-compatible interface, want pay-per-request billing in USDC without registering an account or managing API keys, and are operating in a crypto-native or x402-enabled agent environment on Base. Prefer it over centralized LLM APIs when you need accountless, trustless inference access or are building agentic workflows that pay for compute on-chain.

## Known failure modes

- Payment not included or insufficient USDC — returns HTTP 402 Payment Required
- Malformed request body missing required fields (type, method, bodyType, body) — returns 400 Bad Request
- Model temporarily unavailable upstream at xAI — may return 503 or timeout
- Invalid JSON in chat messages — returns 400 parsing error
- Network timeout on Cloudflare Worker — returns 524 or 504

## How this service works

LLM inference API: OpenAI-compatible chat completions for 136 AI models (Claude, GPT, Gemini, Grok, DeepSeek, Qwen, Kimi, GLM), paid per call in USDC on Base with x402. No account, no API key, automatic refund if the model fails.

## Output

Returns an OpenAI-compatible chat completion JSON object containing the assistant's message content, finish reason (e.g. 'stop'), token usage breakdown (prompt, completion, total tokens), model identifier ('xai/grok-4.7'), and a unique completion ID.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "model": {
   "type": "string",
   "description": "Optional: fixed by the route (xai/grok-4.7)"
  },
  "tools": {
   "type": "array"
  },
  "stream": {
   "type": "boolean",
   "description": "true: server-sent events after payment"
  },
  "messages": {
   "type": "array",
   "items": {
    "type": "object",
    "required": [
     "role"
    ],
    "properties": {
     "role": {
      "enum": [
       "system",
       "user",
       "assistant",
       "tool",
       "developer"
      ],
      "type": "string"
     },
     "content": {
      "type": [
       "string",
       "array",
       "null"
      ]
     }
    }
   },
   "minItems": 1
  },
  "max_tokens": {
   "type": "integer",
   "maximum": 16384,
   "minimum": 1,
   "description": "Optional, default 4096"
  },
  "temperature": {
   "type": "number",
   "maximum": 2,
   "minimum": 0
  },
  "response_format": {
   "type": "object"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "id": "chatcmpl-7f3c2a91",
  "model": "xai/grok-4.7",
  "usage": {
   "total_tokens": 10,
   "prompt_tokens": 9,
   "completion_tokens": 1
  },
  "object": "chat.completion",
  "choices": [
   {
    "index": 0,
    "message": {
     "role": "assistant",
     "content": "OK"
    },
    "finish_reason": "stop"
   }
  ],
  "created": 1791979200
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/model-access-gateway-grok-4-7-chat-completions-2c54b3e3/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from agent402-arb.rosariovitale0096.workers.dev](https://www.zero.xyz/host/agent402-arb.rosariovitale0096.workers.dev/llms.txt)