# x402donghang Grok 4.5 High Chat Completions

> x402donghang Grok 4.5 High Chat Completions is a paid API for AI agents from x402donghang.duckdns.org, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-14).

Serves OpenAI-compatible chat completions using the Grok 4.5 High model, with streaming support, payable per-request via x402 on Base/Solana mainnet.

## Facts

- Endpoint: POST https://x402donghang.duckdns.org/x402/v1/chat/completions
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/x402donghang-grok-4-5-high-chat-completions-9e393265
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_QVT76lzebVQanxf7IOVny

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 x402donghang-grok-4-5-high-chat-completions-9e393265 -d '<json body>'
```

Example prompt: Use the Grok 4.5 High model to answer this question with detailed reasoning: what are the key differences between proof-of-work and proof-of-stake consensus mechanisms?

## When to prefer this

Choose this endpoint when you need access to the Grok 4.5 High model specifically — a high-capability frontier LLM — without a standing subscription, paying only $0.01 USDC per request via the x402 protocol on Base or Solana. It is ideal for agents that require sporadic but powerful reasoning, creative generation, or complex instruction-following, especially in crypto-native or agent-to-agent workflows where micropayments are the preferred billing model.

## Known failure modes

- Payment not received or insufficient USDC balance — returns HTTP 402 with payment instructions
- Invalid model name (must be exactly 'grok-4.5-high') — returns 400 or model-not-found error
- Malformed messages array (missing role or content fields) — returns 422 validation error
- max_tokens exceeds model context limit — response truncated or error returned
- Network timeout on long generations — partial response or connection reset
- Upstream xAI API downtime — service may be temporarily unavailable

## How this service works

GLM 5.2 chat via x402. OpenAI-compatible /v1/chat/completions, streaming supported. Listed as glm-5.2. $0.001 USDC per request on Base/Solana mainnet. See GET /x402/v1/models for the full chat catalog.

## Output

Returns an OpenAI-compatible chat.completion JSON object containing the assistant's generated message, finish reason, model identifier ('grok-4.5-high'), and a completion ID. Streaming mode returns server-sent event chunks in the standard OpenAI delta format.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "model": {
   "type": "string",
   "description": "Use \"glm-5.2\""
  },
  "stream": {
   "type": "boolean"
  },
  "messages": {
   "type": "array",
   "items": {
    "type": "object",
    "required": [
     "role",
     "content"
    ],
    "properties": {
     "role": {
      "type": "string"
     },
     "content": {
      "type": "string"
     }
    }
   }
  },
  "max_tokens": {
   "type": "number"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "id": "chatcmpl-x402",
  "model": "glm-5.2",
  "object": "chat.completion",
  "choices": [
   {
    "index": 0,
    "message": {
     "role": "assistant",
     "content": "Hello!"
    },
    "finish_reason": "stop"
   }
  ]
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/x402donghang-grok-4-5-high-chat-completions-9e393265/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402donghang.duckdns.org](https://www.zero.xyz/host/x402donghang.duckdns.org/llms.txt)