# X402-NVIDIA Kimi-K2 Chat Completions API

> X402-NVIDIA Kimi-K2 Chat Completions API is a paid API for AI agents from x402-nvidia.vercel.app, paid per call via x402, $0.119526/call, status unknown (last checked 2026-09-13).

Access the Kimi K2 language model via x402 micropayment-gated chat completions, returning assistant message responses.

## Facts

- Endpoint: POST https://x402-nvidia.vercel.app/api/kimi-k2
- Price: $0.119526/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-13
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/x402-nvidia-kimi-k2-chat-completions-api-88d3f124
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_in1R_1m_b0PCpmJ8NdW3u

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-kimi-k2-chat-completions-api-88d3f124 -d '<json body>'
```

Example prompt: Use the Kimi K2 model through the NVIDIA NIM x402 gateway to answer this question: what are the key differences between transformer and state space model architectures?

## When to prefer this

Choose this endpoint when you specifically need the Kimi K2 model (Moonshot AI's large MoE model) hosted on NVIDIA NIM infrastructure, and want to pay per call via x402 USDC micropayments without a subscription. Ideal for agents that need pay-as-you-go access to Kimi K2 without managing API keys or monthly plans.

## Known failure modes

- Payment failure or insufficient USDC balance returns 402 Payment Required
- Malformed message array in request body returns 400 Bad Request
- Model unavailability on NVIDIA NIM infrastructure returns 503 Service Unavailable
- Rate limiting or quota exceeded returns 429 Too Many Requests
- Invalid or missing conversation content returns empty or error response

## 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 a choices array containing the assistant's generated message, including role ('assistant') and content fields, following the 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-kimi-k2-chat-completions-api-88d3f124/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)