# Crypto Shark Fleet – Extract JSON Worker

> Crypto Shark Fleet – Extract JSON Worker is a paid API for AI agents from cryptoshark-fleet.duckdns.org, paid per call via x402, $0.04/call, status unknown (last checked 2026-10-11).

Extracts structured JSON from unstructured text input using an AI model, paid per-call via x402 on Base mainnet

## Facts

- Endpoint: POST https://cryptoshark-fleet.duckdns.org/worker/extract-json?utm_source=zero.xyz
- Price: $0.04/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-11
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/crypto-shark-fleet-extract-json-worker-2c74e8fb
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_oU7qw-xwUnI-VG9NXMx6Y

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 crypto-shark-fleet-extract-json-worker-2c74e8fb -d '<json body>'
```

Example prompt: Take this block of text and extract the key fields into a clean JSON object: 'Customer John Doe placed order #4821 on March 3rd for 2 units of Widget Pro at $29.99 each, shipping to 123 Main St, Austin TX 78701.'

## When to prefer this

Choose this endpoint when you need a low-cost, pay-per-call AI extraction worker that accepts raw text and returns structured JSON, especially when operating in a crypto-native x402 payment environment on Base mainnet. Useful for agent pipelines that process variable volumes of text and prefer micropayment billing over subscription APIs.

## Known failure modes

- Input text exceeds 12,000 character limit — request rejected
- Payment not attached or insufficient USDC — 402 Payment Required response
- Malformed input schema — 400 Bad Request
- AI model unable to extract meaningful JSON from ambiguous or empty input — result may be empty or partial
- Network/host unavailability due to duckdns dynamic DNS resolution failure

## How this service works

x402-paid AI utility workers on Base mainnet

## Output

Returns a JSON object with a 'model' field (e.g. 'gpt-5.6-luna') and a 'result' field containing the AI-extracted structured JSON parsed from the input text.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "input": {
   "type": "string",
   "maxLength": 12000
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "model": "gpt-5.6-luna",
  "result": "..."
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/crypto-shark-fleet-extract-json-worker-2c74e8fb/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from cryptoshark-fleet.duckdns.org](https://www.zero.xyz/host/cryptoshark-fleet.duckdns.org/llms.txt)