# GPT-5.4-Mini Chat Completions via GET (gpt55.558686.xyz)

> GPT-5.4-Mini Chat Completions via GET (gpt55.558686.xyz) is a paid API for AI agents from gpt55.558686.xyz, paid per call via x402, $0.00293/call, status unknown (last checked 2026-09-14).

Generates GPT-5.4-mini chat completions via a GET request with query parameters, paid per-request via x402 USDC on Base or Solana.

## Facts

- Endpoint: GET https://gpt55.558686.xyz/v1/chat/completions/gpt-5.4-mini
- Price: $0.00293/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/gpt-5-4-mini-chat-completions-via-get-gpt55-558686-xyz-0d48c13a
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_HifDuHYnYM_oDTx-o3TTm

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-chat-completions-via-get-gpt55-558686-xyz-0d48c13a
```

Example prompt: Ask GPT-5.4-mini to extract the company name and founding year from this text: 'Acme Corp was founded in 1987 and specializes in industrial widgets.' — keep the answer short, max 100 tokens.

## When to prefer this

Choose this endpoint when you need lightweight, low-cost GPT-5.4-mini completions accessible via a simple GET request with query parameters — ideal for routing decisions, short extractions, buyer trials, or agent pipelines that prefer GET-based calls with x402 USDC micropayments on Base or Solana instead of a traditional API key setup.

## Known failure modes

- Input text exceeds 24000 character limit — request rejected
- Upstream GPT-5.4-mini unavailable — service returns error
- x402 payment not submitted or insufficient — 402 Payment Required response
- max_tokens value out of range (must be 1–128000) — validation error
- Missing required 'input' query parameter — bad request error
- USDC on Base transaction fails or times out — payment error

## How this service works

GET quote and query-parameter variant for Generate gpt-5.4-mini chat completions. GPT-5.4 Mini chat for mainstream short answers, routing decisions, extraction helpers, and buyer trials. Model tier: gpt-5.4-mini; upstream model: gpt-5.4-mini. Pay up to $0.00293 per request with x402 USDC on Base or choose the fixed-price Solana USDC option when advertised. Exact fixed-price payment and Base 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. Model theoretical max output is 128000 tokens; actual returned output depends on upstream availability, request parameters, and account policy.

## Output

Returns an OpenAI-compatible JSON object with an id, object type, model name, choices array containing the generated message content, and a usage object with token counts. Actual output length depends on upstream availability and the max_tokens parameter.

## 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-5.4-mini",
        "gpt-5.5",
        "gpt-5.3-codex",
        "gpt-5.4"
       ],
       "type": "string"
      },
      "prompt": {
       "type": "string"
      },
      "system": {
       "type": "string"
      },
      "message": {
       "type": "string"
      },
      "max_tokens": {
       "type": "integer",
       "maximum": 128000,
       "minimum": 1
      },
      "system_prompt": {
       "type": "string"
      },
      "max_output_tokens": {
       "type": "integer",
       "maximum": 128000,
       "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-chat-completions-via-get-gpt55-558686-xyz-0d48c13a/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)