# X402-NVIDIA Mistral Small 4 Chat Completions

> X402-NVIDIA Mistral Small 4 Chat Completions is a paid API for AI agents from x402-nvidia.vercel.app, paid per call via x402, $0.069574/call, status unknown (last checked 2026-09-15).

Run Mistral Small 4 chat completions via NVIDIA NIM, paid per-call with x402 micropayments in USDC

## Facts

- Endpoint: POST https://x402-nvidia.vercel.app/api/mistral-small-4
- Price: $0.069574/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/x402-nvidia-mistral-small-4-chat-completions-f02f7794
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_hLScQ7CkXBCNCDlF2W_xu

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-mistral-small-4-chat-completions-f02f7794 -d '<json body>'
```

Example prompt: Use Mistral Small 4 on NVIDIA NIM to answer this question: 'What are the key differences between transformer and diffusion models?' — pay per call with USDC.

## When to prefer this

Choose this endpoint when you want to run Mistral Small 4 specifically via NVIDIA NIM infrastructure and want to pay per-call in USDC via x402 micropayments rather than managing a subscription. Ideal for agents that need occasional LLM inference without committing to a monthly plan, or for workflows that require on-chain, auditable payment per inference call.

## Known failure modes

- Payment failure or insufficient USDC balance — returns 402 Payment Required
- Invalid or missing message format in request body — returns 400 Bad Request
- Model unavailable or NVIDIA NIM backend error — returns 503 or 500
- Rate limiting if too many concurrent requests — returns 429
- Malformed JSON in request — returns 400

## 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 fields — the standard OpenAI-compatible chat completion response 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-mistral-small-4-chat-completions-f02f7794/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)