# X402-NVIDIA Qwen3-5-122B Chat Completions API

> X402-NVIDIA Qwen3-5-122B Chat Completions API is a paid API for AI agents from x402-nvidia.vercel.app, paid per call via x402, $0.172823/call, status unknown (last checked 2026-09-15).

Runs chat completions using NVIDIA NIM's Qwen3-5 122B model, paid per-call via x402 USDC micropayments

## Facts

- Endpoint: POST https://x402-nvidia.vercel.app/api/qwen3-5-122b
- Price: $0.172823/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-qwen3-5-122b-chat-completions-api-53f717b7
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_a_jFo8PCC0m74psLRKEl_

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-qwen3-5-122b-chat-completions-api-53f717b7 -d '<json body>'
```

Example prompt: Use the Qwen3-5 122B model on NVIDIA NIM to answer this question — paying the ~$0.17 USDC micropayment per call: 'Explain the differences between transformer and mamba architectures in plain English.'

## When to prefer this

Choose this endpoint when you want pay-per-call access to a very large (122B parameter) open-weight model (Qwen3-5) hosted on NVIDIA NIM infrastructure, without needing a subscription or API key — only a USDC wallet supporting x402. Prefer it over OpenAI or Anthropic APIs when you want Qwen model outputs specifically, or when you want micropayment-based billing at ~$0.17/call.

## Known failure modes

- 402 Payment Required if x402 payment header is missing or insufficient
- model overload or timeout if NVIDIA NIM backend is under high load
- malformed request if messages array is missing or incorrectly structured
- payment settlement failure if USDC wallet has insufficient funds
- 503 or 500 if the Vercel deployment or NVIDIA NIM endpoint is unavailable

## 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's generated message, including role ('assistant') and content (the model's text response), 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-qwen3-5-122b-chat-completions-api-53f717b7/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)