# X402-NVIDIA Mistral Medium 3.5 Chat Completions

> X402-NVIDIA Mistral Medium 3.5 Chat Completions is a paid API for AI agents from x402-nvidia.vercel.app, paid per call via x402, $0.18977/call, status unknown (last checked 2026-09-14).

Runs chat completions via Mistral Medium 3.5 hosted on NVIDIA NIM, paid per-call using x402 USDC micropayments

## Facts

- Endpoint: POST https://x402-nvidia.vercel.app/api/mistral-medium-3-5
- Price: $0.18977/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-mistral-medium-3-5-chat-completions-5aeae3db
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_Zbi_ZtQcRasj55zj5SRSC

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-medium-3-5-chat-completions-5aeae3db -d '<json body>'
```

Example prompt: Use Mistral Medium 3.5 on NVIDIA NIM to answer this question for me, paying per call: 'Explain the differences between transformer and mamba architectures in plain English.'

## When to prefer this

Choose this endpoint when you need Mistral Medium 3.5 specifically, hosted on NVIDIA's high-performance NIM inference infrastructure, and want to pay only per call via USDC micropayments rather than maintaining a subscription — ideal for agents that call LLMs sporadically or need to attribute exact per-call costs

## Known failure modes

- Payment failure or insufficient USDC balance resulting in 402 Payment Required
- Invalid message format or missing required fields returning 400 Bad Request
- Model overload or NVIDIA NIM backend timeout returning 503
- Malformed x402 payment header returning 401 Unauthorized
- Rate limit exceeded returning 429 Too Many Requests

## 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 one or more choices, each containing an assistant message with the model's generated response content

## 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-medium-3-5-chat-completions-5aeae3db/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)