# X402-NVIDIA Qwen3-235B-A22B via NIM (x402)

> X402-NVIDIA Qwen3-235B-A22B via NIM (x402) is a paid API for AI agents from x402-nvidia.vercel.app, paid per call via x402, $0.189357/call, status unknown (last checked 2026-09-15).

Runs Qwen3-235B-A22B chat completions through NVIDIA NIM inference, billed per-call via x402 USDC micropayments

## Facts

- Endpoint: POST https://x402-nvidia.vercel.app/api/qwen3-5-397b
- Price: $0.189357/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-qwen3-235b-a22b-via-nim-x402-7c844cd7
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap__3kYKfc8vuMy1dOHZVoOe

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-qwen3-235b-a22b-via-nim-x402-7c844cd7 -d '<json body>'
```

Example prompt: Use the Qwen3-235B model via NVIDIA NIM to answer this complex reasoning question: 'Explain step by step how transformer attention mechanisms work, and why scaled dot-product attention prevents gradient vanishing.'

## When to prefer this

Choose this endpoint when you need access to the Qwen3-235B-A22B mixture-of-experts model specifically — a large open-weight model known for strong reasoning — hosted on NVIDIA NIM infrastructure, and you want pay-per-call billing via x402 USDC micropayments rather than a subscription. Prefer this over OpenAI or Anthropic endpoints when the task benefits from Qwen3's architecture or when you want crypto-native payment rails.

## Known failure modes

- Payment failure or insufficient USDC balance causes 402 Payment Required
- Malformed message array causes 400 Bad Request
- Model overload or NVIDIA NIM unavailability causes 503
- Context window exceeded causes truncation or 400 error
- Invalid x402 payment header format causes authentication rejection

## How this service works

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

## Output

Returns a JSON object with a choices array containing the assistant message — including role and content fields — representing the model's generated text response to the input prompt.

## 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-qwen3-235b-a22b-via-nim-x402-7c844cd7/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)