# GPT-5.4 Mini Economy Chat Completions (GET)

> GPT-5.4 Mini Economy Chat Completions (GET) is a paid API for AI agents from gpt55.558686.xyz, paid per call via x402, $0.00293/call, status unknown (last checked 2026-09-15).

Generates low-cost, short chat completions using GPT-5.4 mini via a GET request with query parameters, optimized for fast answers, routing decisions, and extraction tasks.

## Facts

- Endpoint: GET https://gpt55.558686.xyz/v1/chat/completions/mini
- Price: $0.00293/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/gpt-5-4-mini-economy-chat-completions-get-acd5ac0e
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_M6182ygHnbNQzE03zNxZh

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-5-4-mini-economy-chat-completions-get-acd5ac0e
```

Example prompt: Ask GPT-5.4 mini to extract the company name from this text — 'Founded in 2010, Acme Corp has grown to over 500 employees' — keep the answer under 20 tokens using the economy mini model.

## When to prefer this

Choose this endpoint when you need a very fast, low-cost text generation or extraction call and can express your prompt as a simple GET query parameter. Ideal for routing decisions, short extractions, and buyer trials where cost matters and responses are short. Prefer over heavier models when output fits within 128 tokens and the task is simple classification, extraction, or Q&A.

## Known failure modes

- Payment not provided or insufficient — 402 Payment Required with price details
- Input exceeds 24000 character limit — request rejected
- max_tokens set above 128 — validation error
- Invalid model enum value — must be gpt-5.5 or gpt-5.4-mini
- Upstream model unavailable — 502 or 503 error from proxy
- Malformed query parameters — missing required input field

## How this service works

GET quote and query-parameter variant for Generate low-cost short chat completions with GPT-5.4 mini. Economy chat tier for short answers, routing decisions, extraction helpers, and fast buyer trials. Model tier: economy / mini / fast; upstream model: gpt-5.4-mini. Pay up to $0.00293 per request with x402 USDC on Base. Exact fixed-price payment and upto token-metered payment are both accepted when clients support them; upto settlements use actual response usage, a 0.0001 minimum, and the selected tier price as the cap. Public paid calls are limited to 24000 input characters and 128 output tokens.

## Output

Returns an OpenAI-compatible chat completion object with an id, object type, model name, choices array (containing the generated text), and usage statistics. Output is capped at 128 tokens. The response mirrors the standard OpenAI chat completions format.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "properties": {
      "q": {
       "type": "string"
      },
      "input": {
       "type": "string"
      },
      "model": {
       "enum": [
        "gpt-5.5",
        "gpt-5.4-mini"
       ],
       "type": "string"
      },
      "prompt": {
       "type": "string"
      },
      "system": {
       "type": "string"
      },
      "message": {
       "type": "string"
      },
      "max_tokens": {
       "type": "integer",
       "maximum": 128,
       "minimum": 1
      },
      "system_prompt": {
       "type": "string"
      },
      "max_output_tokens": {
       "type": "integer",
       "maximum": 128,
       "minimum": 1
      }
     },
     "additionalProperties": true
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "required": [
      "id",
      "object",
      "model",
      "choices"
     ],
     "properties": {
      "id": {
       "type": "string"
      },
      "model": {
       "type": "string"
      },
      "usage": {
       "type": "object"
      },
      "object": {
       "type": "string"
      },
      "choices": {
       "type": "array"
      }
     },
     "additionalProperties": true
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/gpt-5-4-mini-economy-chat-completions-get-acd5ac0e/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from gpt55.558686.xyz](https://www.zero.xyz/host/gpt55.558686.xyz/llms.txt)