# GPT-5.5 Professional JSON Extraction

> GPT-5.5 Professional JSON Extraction is a paid API for AI agents from gpt55.558686.xyz, paid per call via x402, $0.17/call, status unknown (last checked 2026-09-14).

Extracts structured JSON data from unstructured text using GPT-5.5 at professional tier quality, paid via x402 USDC on Base

## Facts

- Endpoint: POST https://gpt55.558686.xyz/v1/tools/extract-json/professional
- Price: $0.17/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/gpt-5-5-professional-json-extraction-5b27ba6b
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_nzPme44bsD25SLLhnez6h

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-professional-json-extraction-5b27ba6b -d '<json body>'
```

Example prompt: Extract the following fields — company_name, revenue, headcount, and founding_year — from this press release text as a JSON object using professional-quality GPT-5.5 extraction, up to 4096 output tokens: [paste text here].

## When to prefer this

Choose this endpoint when you need high-fidelity, professional-grade structured JSON extraction from large or complex documents (up to 700k characters) and accuracy is critical. Prefer this over standard or economy tiers when the source text is dense, ambiguous, or requires nuanced field extraction. Best when you have a known schema or list of fields and need reliable, consistent JSON output.

## Known failure modes

- Input text exceeds 700,000 character limit — request rejected
- max_tokens exceeds 4096 — request rejected
- Payment not settled via x402 USDC on Base — 402 response returned
- Requested fields not present in source text — extracted values may be null or empty
- Temperature or token parameters out of valid range — validation error
- Malformed schema object — extraction may fail or return unexpected structure

## How this service works

Professional structured extraction for high-fidelity data capture. Model tier: professional; upstream model: gpt-5.5. Price is derived from official OpenAI relative token costs with a local margin and floor. Pay up to $0.17 per request with x402 USDC on Base. Public paid calls are limited to 700000 input characters and 4096 output tokens.

## Output

A structured JSON object containing the requested fields or schema-conformant properties extracted from the input text, produced by GPT-5.5 at professional tier with up to 4096 output tokens and up to 700,000 input characters.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "text": {
   "type": "string",
   "maxLength": 700000,
   "minLength": 1
  },
  "fields": {
   "type": "array",
   "items": {
    "type": "string"
   }
  },
  "schema": {
   "type": "object",
   "additionalProperties": true
  },
  "max_tokens": {
   "type": "integer",
   "maximum": 4096,
   "minimum": 1
  },
  "temperature": {
   "type": "number",
   "maximum": 2,
   "minimum": 0
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/gpt-5-5-professional-json-extraction-5b27ba6b/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)