# X402-NVIDIA Llama-3.3-Nemotron-Super-49B Chat Completions

> X402-NVIDIA Llama-3.3-Nemotron-Super-49B Chat Completions is a paid API for AI agents from x402-nvidia.vercel.app, paid per call via x402, $0.158628/call, status unknown (last checked 2026-09-14).

Run chat completions against NVIDIA's Llama-3.3-Nemotron-Super-49B model via x402 micropayment-gated API

## Facts

- Endpoint: POST https://x402-nvidia.vercel.app/api/llama-3-3-nemotron-super-49b
- Price: $0.158628/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/x402-nvidia-llama-3-3-nemotron-super-49b-chat-completions-8998a2ed
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_vN7vJmvSJTZT05nfAQjrw

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 x402-nvidia-llama-3-3-nemotron-super-49b-chat-completions-8998a2ed -d '<json body>'
```

Example prompt: Use NVIDIA's Llama-3.3-Nemotron-Super-49B model to answer this question: 'What are the key differences between transformer and mamba architectures for long-context tasks?'

## When to prefer this

Choose this endpoint when you need access to NVIDIA's Llama-3.3-Nemotron-Super-49B model specifically, want pay-per-call pricing via USDC micropayments without a subscription, or need a high-parameter (49B) model for complex reasoning tasks billed per request.

## Known failure modes

- Payment failure: x402 micropayment rejected or insufficient USDC balance
- Model overload: NVIDIA NIM backend unavailable or rate-limited
- Malformed input: missing or invalid message format causes 400 error
- Network timeout: Vercel proxy or NVIDIA NIM endpoint unreachable
- Authentication error: x402 payment header missing or invalid

## How this service works

Access 48+ NVIDIA NIM AI models via x402 micropayments. Chat completions, vision, safety, translation, and more.

## Output

Returns a chat completion object with an array of choices, each containing a message with role 'assistant' and the generated text content from the Nemotron-Super-49B model.

## Response schema (JSON Schema)

```json
{
 "type": "object",
 "example": {
  "choices": [
   {
    "message": {
     "role": "assistant",
     "content": "Hello!"
    }
   }
  ]
 },
 "properties": {
  "choices": {
   "type": "array",
   "description": "Model responses"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/x402-nvidia-llama-3-3-nemotron-super-49b-chat-completions-8998a2ed/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402-nvidia.vercel.app](https://www.zero.xyz/host/x402-nvidia.vercel.app/llms.txt)