# X402-NVIDIA Mixtral-8x7B Chat Completions

> X402-NVIDIA Mixtral-8x7B Chat Completions is a paid API for AI agents from x402-nvidia.vercel.app, paid per call via x402, $0.117863/call, status unknown (last checked 2026-09-14).

Generate chat completions using Mixtral-8x7B via NVIDIA NIM, paid per-call with USDC micropayments over x402

## Facts

- Endpoint: POST https://x402-nvidia.vercel.app/api/mixtral-8x7b
- Price: $0.117863/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-mixtral-8x7b-chat-completions-da86948d
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_kA8Y9qVkZVyTVCMzquJYe

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-mixtral-8x7b-chat-completions-da86948d -d '<json body>'
```

Example prompt: Using the NVIDIA NIM Mixtral-8x7B model, answer this question for me: 'What are the key differences between supervised and unsupervised learning in machine learning?' — and pay the per-call fee automatically.

## When to prefer this

Choose this endpoint when you need Mixtral-8x7B specifically (a high-quality open mixture-of-experts model) via NVIDIA's optimized NIM inference infrastructure, and want to pay per-call in USDC via x402 without a monthly subscription. Prefer over OpenAI if you want open-weight model transparency or cost-per-call billing. Best for agents with crypto wallets already set up for x402 payments.

## Known failure modes

- Payment failure: insufficient USDC balance or x402 micropayment not accepted, resulting in 402 Payment Required
- Invalid input schema: missing or malformed messages array returns 400 Bad Request
- Model unavailable: NVIDIA NIM backend outage returns 503 or timeout
- Rate limiting: too many concurrent requests may return 429
- Empty or truncated response if prompt is too long for context window

## How this service works

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

## Output

A JSON object with a 'choices' array containing the assistant's generated message, including role ('assistant') and content text, following the OpenAI-compatible chat completions format.

## 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-mixtral-8x7b-chat-completions-da86948d/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)