# SingIt Ask – GPT-5.5 Chat Completions

> SingIt Ask – GPT-5.5 Chat Completions is a paid API for AI agents from ask.singitai.app, paid per call via x402, $0.021313/call, status unknown (last checked 2026-10-30).

Provides OpenAI GPT-5.5 chat completions via an OpenAI-compatible API, requiring no API key or account, billed per call via x402.

## Facts

- Endpoint: POST https://ask.singitai.app/v1/chat/gpt-5.5?utm_source=zero.xyz
- Price: $0.021313/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-30
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/singit-ask-gpt-5-5-chat-completions-f8ef1975
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_BlnzElkgbCytxM2_EmOsE

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 singit-ask-gpt-5-5-chat-completions-f8ef1975 -d '<json body>'
```

Example prompt: Ask GPT-5.5 to explain the difference between async and sync programming in Python with a short code example — keep the response under 800 tokens.

## When to prefer this

Choose this endpoint when an agent specifically needs GPT-5.5 from OpenAI and does not have an OpenAI API key, or when using a pay-per-call model via x402 micropayments is preferred over a subscription. It is OpenAI-compatible so it integrates with existing OpenAI SDK tooling with a base URL swap. Prefer sibling endpoints for image generation, speech synthesis, or web search tasks.

## Known failure modes

- Message content exceeds 24000 character limit — request rejected
- max_tokens set above 1200 — request rejected
- Fewer than 1 message in the messages array — validation error
- Payment not provided or insufficient USDC via x402 — 402 Payment Required
- Invalid model ID specified — model not found error
- Messages array exceeds 40 items — request rejected

## How this service works

SingIt Ask: GPT-5.5 (OpenAI) chat completions with no API key or account, OpenAI-compatible. OpenAI's GPT-5.5 model: general-purpose chat, coding and reasoning. Call it when an agent needs GPT-5.5 specifically.

## Output

Returns an OpenAI-compatible chat completion object containing the assistant's generated text response, role, and usage metadata (tokens used). Streaming is not supported; the full reply is returned in one response.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "model": {
   "type": "string",
   "examples": [
    "deepseek-v4.1-flash",
    "claude-opus-5.5",
    "gpt-5.5",
    "gemini-3.1-pro"
   ],
   "description": "Any model id from GET /v1/models; the ceiling follows its price. Omit for the default model."
  },
  "stream": {
   "enum": [
    false
   ],
   "type": "boolean",
   "description": "Streaming is not offered."
  },
  "messages": {
   "type": "array",
   "items": {
    "type": "object",
    "required": [
     "role",
     "content"
    ],
    "properties": {
     "role": {
      "enum": [
       "system",
       "user",
       "assistant"
      ],
      "type": "string"
     },
     "content": {
      "type": "string",
      "description": "Plain text; all messages together under 24000 characters."
     }
    }
   },
   "maxItems": 40,
   "minItems": 1,
   "description": "The conversation, oldest first."
  },
  "max_tokens": {
   "type": "integer",
   "default": 800,
   "maximum": 1200,
   "minimum": 1,
   "description": "The longest answer, in tokens. The payment ceiling grows with it; the charge follows what was used."
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/singit-ask-gpt-5-5-chat-completions-f8ef1975/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from ask.singitai.app](https://www.zero.xyz/host/ask.singitai.app/llms.txt)