# gpt.558686.xyz Chat

> gpt.558686.xyz Chat is a paid API for AI agents from gpt.558686.xyz, paid per call via x402, $0.05/call, status unknown (last checked 2026-10-02).

Sends a prompt to a GPT-based chat endpoint and returns an AI-generated text response

## Facts

- Endpoint: GET https://gpt.558686.xyz/v1/chat?utm_source=zero.xyz
- Price: $0.05/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-02
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/gpt-558686-xyz-chat-3faa9988
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_3VUn9kdQ0A1r_3McV8Ox1

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 gpt-558686-xyz-chat-3faa9988
```

Example prompt: Ask the GPT chat endpoint to explain the difference between machine learning and deep learning in simple terms.

## When to prefer this

Choose this endpoint when you need a low-cost, pay-per-call GPT chat completion accessible via the x402 payment protocol, especially in agent pipelines that require on-demand text generation without a pre-existing API key arrangement.

## Known failure modes

- Missing or empty input field returns an error
- Payment of $0.05 USDC not provided results in 402 Payment Required
- Invalid params object structure may cause unexpected behavior
- Rate limiting or quota exceeded on the underlying model
- Network timeout if the model takes too long to respond

## Output

Returns an AI-generated text response based on the provided prompt or task input, delivered as a chat completion from a GPT-style language model.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "model": {
   "type": "string",
   "description": "Model id, e.g. gpt-6-sol"
  },
  "messages": {
   "type": "array",
   "items": {
    "type": "object",
    "required": [
     "role",
     "content"
    ],
    "properties": {
     "role": {
      "enum": [
       "system",
       "user",
       "assistant"
      ],
      "type": "string"
     },
     "content": {
      "type": "string"
     }
    }
   },
   "minItems": 1,
   "description": "OpenAI-style messages array (required, at least one message)"
  },
  "max_tokens": {
   "type": "integer",
   "description": "Maximum output tokens"
  },
  "temperature": {
   "type": "number",
   "description": "Sampling temperature (0-2)"
  },
  "response_format": {
   "type": "object",
   "description": "Optional structured output format, e.g. {\"type\":\"json_object\"}"
  },
  "system_enhancement": {
   "type": "boolean",
   "description": "Auto-prepend an optimized system prompt when none is provided (default true)"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/gpt-558686-xyz-chat-3faa9988/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from gpt.558686.xyz](https://www.zero.xyz/host/gpt.558686.xyz/llms.txt)