# Model Access Gateway – Kimi K3 Chat Completions (x402, USDC)

> Model Access Gateway – Kimi K3 Chat Completions (x402, USDC) is a paid API for AI agents from modelaccessgateway.com, paid per call via x402, $0.0014/call, status unknown (last checked 2026-10-18).

Runs OpenAI-compatible chat completions against Moonshot's Kimi K3 model, billed per-call in USDC on Base via x402 with no account or API key required.

## Facts

- Endpoint: POST https://modelaccessgateway.com/llm/kimi-k3?utm_source=zero.xyz
- Price: $0.0014/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-18
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/model-access-gateway-kimi-k3-chat-completions-x402-usdc-b0f76a0a
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_6CAYQzHvlHYau_wkcwV0P

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 model-access-gateway-kimi-k3-chat-completions-x402-usdc-b0f76a0a -d '<json body>'
```

Example prompt: Ask Kimi K3 to summarize the following article in 3 bullet points and keep the response under 200 tokens — pay with USDC on Base, no API key needed.

## When to prefer this

Choose this endpoint when you need Kimi K3 (Moonshot) specifically, want to pay per-call in USDC without an API key or account, need an OpenAI-compatible interface for easy drop-in use, or are building crypto-native agents that manage their own payments. Prefer alternatives if you need a different model family, want traditional API-key billing, or require SLA guarantees beyond automatic refunds.

## Known failure modes

- Insufficient USDC balance — payment rejected, no completion returned
- Model-side failure — automatic refund issued, no content
- Malformed messages array (missing role field) — 400 validation error
- max_tokens exceeds 16384 — request rejected
- Temperature out of range 0–2 — validation error
- Payment network congestion on Base — delayed or failed settlement

## How this service works

LLM inference API: OpenAI-compatible chat completions for 136 AI models (Claude, GPT, Gemini, Grok, DeepSeek, Qwen, Kimi, GLM), paid per call in USDC on Base with x402. No account, no API key, automatic refund if the model fails.

## Output

Returns a standard OpenAI-format chat.completion JSON object containing the assistant's message content, finish reason (e.g. 'stop'), prompt/completion/total token counts, model identifier ('moonshot/kimi-k3'), and a unique completion ID. When streaming is enabled, responses arrive as server-sent events. If the model fails, an automatic refund is issued.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "model": {
   "type": "string",
   "description": "Optional: fixed by the route (moonshot/kimi-k3)"
  },
  "tools": {
   "type": "array"
  },
  "stream": {
   "type": "boolean",
   "description": "true: server-sent events after payment"
  },
  "messages": {
   "type": "array",
   "items": {
    "type": "object",
    "required": [
     "role"
    ],
    "properties": {
     "role": {
      "enum": [
       "system",
       "user",
       "assistant",
       "tool",
       "developer"
      ],
      "type": "string"
     },
     "content": {
      "type": [
       "string",
       "array",
       "null"
      ]
     }
    }
   },
   "minItems": 1
  },
  "max_tokens": {
   "type": "integer",
   "maximum": 16384,
   "minimum": 1,
   "description": "Optional, default 4096"
  },
  "temperature": {
   "type": "number",
   "maximum": 2,
   "minimum": 0
  },
  "response_format": {
   "type": "object"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "id": "chatcmpl-7f3c2a91",
  "model": "moonshot/kimi-k3",
  "usage": {
   "total_tokens": 10,
   "prompt_tokens": 9,
   "completion_tokens": 1
  },
  "object": "chat.completion",
  "choices": [
   {
    "index": 0,
    "message": {
     "role": "assistant",
     "content": "OK"
    },
    "finish_reason": "stop"
   }
  ],
  "created": 1791979200
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/model-access-gateway-kimi-k3-chat-completions-x402-usdc-b0f76a0a/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from modelaccessgateway.com](https://www.zero.xyz/host/modelaccessgateway.com/llms.txt)