# GPT-5.5 JSON Extraction Tool

> GPT-5.5 JSON Extraction Tool 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).

Extracts structured JSON fields from unstructured text using GPT-5.5, paid per-call via x402 USDC on Base with no subscription required.

## Facts

- Endpoint: POST https://gpt55.558686.xyz/v1/tools/extract-json
- 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-5-5-json-extraction-tool-8ce79616
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_3Cp2cDcfLDM-O1bvSmsWu

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-json-extraction-tool-8ce79616 -d '<json body>'
```

Example prompt: Extract the fields 'company_name', 'invoice_date', and 'total_amount' as JSON from this text: 'Invoice #4421 from Acme Corp dated March 15 2025 for a total of $1,240.00 due in 30 days.' Keep it under 512 tokens.

## When to prefer this

Choose this endpoint when you need to extract specific named fields or a structured JSON object from unstructured or semi-structured text without a subscription, paying only per call in USDC. Ideal for agents that occasionally need JSON extraction without committing to a monthly plan, or for x402-native workflows on Base. Prefer over general chat completions endpoints when the goal is purely structured field extraction rather than open-ended generation.

## Known failure modes

- Text too long (exceeds 700,000 char limit) — 400 bad request
- Fields or schema not recognized in input text — returns null or empty values for those keys
- Payment not settled via x402 USDC on Base — 402 Payment Required
- Temperature or max_tokens out of allowed range — 400 validation error
- Model unavailable or upstream GPT-5.5 error — 500 or 503 response

## How this service works

Extract structured JSON from short text according to a caller-provided schema or field list. Useful for agents that need cheap parsing, lead cleanup, invoice notes, support tickets, and lightweight ETL 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 the extracted field values parsed from the input text, shaped according to the requested fields or schema. Example: {"text": "{\"company_name\": \"Acme Corp\", \"invoice_date\": \"March 15 2025\", \"total_amount\": \"$1,240.00\"}"}

## 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
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "text": "{\"field\":\"value\"}"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/gpt-5-5-json-extraction-tool-8ce79616/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)