# Model Access Gateway – Llama 3.3 70B Chat Completions

> Model Access Gateway – Llama 3.3 70B Chat Completions is a paid API for AI agents from agent402-arb.rosariovitale0096.workers.dev, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-15).

Serves OpenAI-compatible chat completion responses from Meta's Llama 3.3 70B model, billed per request in USDC via x402 with no account or API key required.

## Facts

- Endpoint: POST https://agent402-arb.rosariovitale0096.workers.dev/llm/llama-3.3-70b?utm_source=zero.xyz
- Price: $0.001/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-llama-3-3-70b-chat-completions-2eddece7
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_KNL4sY43vOszh7NGkc1ku

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-llama-3-3-70b-chat-completions-2eddece7 -d '<json body>'
```

Example prompt: Ask the Llama 3.3 70B model this question and pay for it per-request in USDC: 'What are three creative names for a sustainable coffee brand?' — use the agent402 gateway so I don't need an API key.

## When to prefer this

Choose this endpoint when you need OpenAI-compatible Llama 3.3 70B inference with no account signup, no API key management, and true pay-per-request billing in USDC via x402. Ideal for autonomous agents that need to spawn LLM calls dynamically, for developers prototyping without committing to a subscription, or for crypto-native workflows where on-chain micropayments are preferred over traditional billing. Prefer it over OpenAI or Anthropic endpoints when you specifically want an open-weight model or when cost-per-call transparency in stablecoin is important.

## Known failure modes

- Payment not included or insufficient USDC — returns HTTP 402 Payment Required
- Malformed request body missing required fields — returns 400 Bad Request
- Model temporarily unavailable on the gateway — returns 503 or timeout
- Rate limit exceeded on the underlying worker — returns 429 Too Many Requests
- Invalid or unsupported chat message format — may return 400 or garbled output

## How this service works

Llama 3.3 70B API (meta-llama/llama-3.3-70b): LLM inference via OpenAI-compatible chat completions, pay per call in USDC on Base with x402. No API key, no account. Suited for AI agents and scripts that need Llama 3.3 70B on demand. Streaming and function calling supported. Exact price in the 402 quote before payment; automatic refund if the model fails to answer.

## Output

Returns a JSON object in the OpenAI chat.completion format containing: a completion ID, the model name, an array of choices each with an assistant message and finish_reason, and a usage object reporting prompt_tokens, completion_tokens, and total_tokens.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "model": {
   "type": "string",
   "description": "Optional: fixed by the route (meta-llama/llama-3.3-70b)"
  },
  "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": "meta-llama/llama-3.3-70b",
  "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-llama-3-3-70b-chat-completions-2eddece7/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)