# Telnyx x402 Gateway – Llama 3.3 70B Chat Completions

> Telnyx x402 Gateway – Llama 3.3 70B Chat Completions is a paid API for AI agents from x402.telnyx.com, paid per call via x402, $0.007016/call, status unknown (last checked 2026-10-10).

Runs OpenAI-compatible chat completions against Meta's Llama-3.3-70B-Instruct model, billed per-request in USDC via the x402 payment protocol.

## Facts

- Endpoint: POST https://x402.telnyx.com/v1/chat/completions/_t/llama-3.3-70b?utm_source=zero.xyz
- Price: $0.007016/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-10
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/telnyx-x402-gateway-llama-3-3-70b-chat-completions-c52169b8
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_md9Fv_sbSXlKr2fTUJgGJ

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 telnyx-x402-gateway-llama-3-3-70b-chat-completions-c52169b8 -d '<json body>'
```

Example prompt: Ask Llama 3.3 70B to draft a concise three-paragraph executive summary of the following meeting notes, keeping the tone professional — pay for it per-request with USDC: [paste notes here].

## When to prefer this

Choose this endpoint when you need a capable 70B-parameter open-weight LLM (Llama 3.3) with OpenAI-compatible chat format, want pay-per-request billing in USDC without a monthly subscription, and are operating in an agentic or automated context where x402 micropayment headers can be attached. Prefer it over subscription-based LLM APIs for sporadic or burstable workloads, or when crypto-native payment rails are required. Also suitable when you need tool-calling support (up to 16 tools) at a predictable per-call cost.

## Known failure modes

- Payment not attached or insufficient USDC balance — 402 Payment Required
- messages array exceeds 32 items or content exceeds 8000 characters — 400 validation error
- max_tokens out of range [1–1024] — 400 validation error
- Model identifier mismatch (must be meta-llama/Llama-3.3-70B-Instruct) — 400 error
- Telnyx inference backend timeout or overload — 503 or 504
- Malformed message role (must be system/user/assistant/tool) — 400 validation error

## How this service works

Pay USDC per request for Telnyx Inference and Audio (text-to-speech, speech-to-text) through x402.

## Output

Returns an OpenAI-compatible chat.completion JSON object containing the assistant's reply message, finish reason (e.g. 'stop'), and token usage breakdown (prompt, completion, total tokens). The completion ID and object type are also included for logging.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "n": {
   "type": "integer",
   "const": 1,
   "description": "Fixed to one completion per paid call."
  },
  "model": {
   "type": "string",
   "const": "meta-llama/Llama-3.3-70B-Instruct",
   "description": "Model identifier; fixed to meta-llama/Llama-3.3-70B-Instruct on this route."
  },
  "tools": {
   "type": "array",
   "items": {
    "type": "object"
   },
   "maxItems": 16
  },
  "messages": {
   "type": "array",
   "items": {
    "type": "object",
    "required": [
     "role",
     "content"
    ],
    "properties": {
     "role": {
      "enum": [
       "system",
       "user",
       "assistant",
       "tool"
      ],
      "type": "string"
     },
     "content": {
      "type": "string",
      "maxLength": 8000
     }
    }
   },
   "maxItems": 32,
   "description": "OpenAI-style chat messages."
  },
  "max_tokens": {
   "type": "integer",
   "maximum": 1024,
   "minimum": 1
  },
  "temperature": {
   "type": "number",
   "maximum": 2,
   "minimum": 0
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "id": "chatcmpl-xxx",
  "usage": {
   "total_tokens": 16,
   "prompt_tokens": 12,
   "completion_tokens": 4
  },
  "object": "chat.completion",
  "choices": [
   {
    "index": 0,
    "message": {
     "role": "assistant",
     "content": "Hello!"
    },
    "finish_reason": "stop"
   }
  ]
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/telnyx-x402-gateway-llama-3-3-70b-chat-completions-c52169b8/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402.telnyx.com](https://www.zero.xyz/host/x402.telnyx.com/llms.txt)