# SingIt Ask – GPT-5.6 Terra (OpenAI)

> SingIt Ask – GPT-5.6 Terra (OpenAI) is a paid API for AI agents from ask.singitai.app, paid per call via x402, $0.009125/call, status unknown (last checked 2026-10-30).

Provides OpenAI GPT-5.6 Terra chat completions via a pay-per-call x402 endpoint, no API key or account required.

## Facts

- Endpoint: POST https://ask.singitai.app/v1/chat/gpt-5.6-terra?utm_source=zero.xyz
- Price: $0.009125/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-5-6-terra-openai-93cb248e
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_stMER5y2ENdnDiW8NVXBq

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-5-6-terra-openai-93cb248e -d '<json body>'
```

Example prompt: Ask GPT-5.6 Terra to review this Python function and suggest optimizations — keep the answer under 800 tokens: 'def fib(n): return n if n <= 1 else fib(n-1) + fib(n-2)'.

## When to prefer this

Choose this endpoint when an agent specifically requires GPT-5.6 Terra from OpenAI and has no OpenAI API key or account, or when paying per-call via x402 USDC micropayments on Base or Solana is preferred over subscription billing. Ideal for lightweight, occasional requests where setting up an OpenAI account is impractical or for agents operating in a fully decentralized, account-free payment environment.

## Known failure modes

- Payment not received or insufficient USDC — returns 402 Payment Required
- Messages exceed 24000 character limit — returns 400 with validation error
- max_tokens exceeds maximum of 1200 — returns 400
- Conversation has more than 40 messages — returns 400
- Upstream OpenAI model unavailable — returns 503 or 502
- Invalid role value in messages array — returns 400 schema validation error

## How this service works

SingIt Ask: GPT-5.6 Terra (OpenAI) chat completions with no API key or account, OpenAI-compatible. Another GPT-5.6 variant from OpenAI: general-purpose chat, coding and reasoning. Call it when an agent needs GPT-5.6 Terra specifically.

## Output

A JSON object following the OpenAI chat completions schema, containing the assistant's reply text, token usage counts, model identifier, and finish reason. The response is non-streaming and capped at the requested max_tokens (up to 1200).

## 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-5-6-terra-openai-93cb248e/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)