# GPT-5.5 Answer Tool (gpt55.558686.xyz)

> GPT-5.5 Answer Tool (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 2026-09-13).

Answers a question given optional context using GPT-5.5 via a pay-per-call x402 USDC endpoint, returning a concise text answer.

## Facts

- Endpoint: POST https://gpt55.558686.xyz/v1/tools/answer
- Price: $0.00293/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-13
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/gpt-5-5-answer-tool-gpt55-558686-xyz-67ab4f06
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_KP94HI85L0iQrCjc9MpSM

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-5-5-answer-tool-gpt55-558686-xyz-67ab4f06 -d '<json body>'
```

Example prompt: Can you answer this question for me using GPT-5.5: 'What are the main causes of inflation?' — use up to 500 tokens and a temperature of 0.7, and here's some background context: 'Inflation is a macroeconomic phenomenon where the general price level rises over time.'

## When to prefer this

Use this endpoint when you need a lightweight, pay-per-call AI question-answering capability without a subscription, especially when you want to leverage GPT-5.5 with optional context injection and control over token budget and temperature. Prefer this over full chat completion endpoints when you just need a single concise answer rather than a multi-turn conversation.

## Known failure modes

- Payment not included or insufficient USDC — returns HTTP 402
- Question field missing or empty — validation error
- Context or question exceeds 700,000 character limit — request rejected
- max_tokens out of range (must be 1–4096) — validation error
- temperature out of range (must be 0–2) — validation error
- GPT-5.5 model unavailable or upstream error — 5xx response

## How this service works

Answer a short question, optionally using provided context, for lightweight context QA and agent reasoning steps. Pay up to $0.003 per request with x402 USDC on Base. Public paid calls are limited to 1500 input characters and 128 output tokens.

## Output

Returns a JSON object with a 'text' field containing a concise AI-generated answer to the submitted question, optionally informed by the provided context.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "context": {
   "type": "string",
   "maxLength": 700000
  },
  "question": {
   "type": "string",
   "maxLength": 700000,
   "minLength": 1
  },
  "max_tokens": {
   "type": "integer",
   "maximum": 4096,
   "minimum": 1
  },
  "temperature": {
   "type": "number",
   "maximum": 2,
   "minimum": 0
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "text": "Concise answer."
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/gpt-5-5-answer-tool-gpt55-558686-xyz-67ab4f06/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)