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+---
+layout: integration
+name: OpenZoo
+description: Use OpenZoo's pay-per-call OpenAI-compatible API in Haystack via the local npx openzoo proxy
+authors:
+    - name: OpenZoo
+      socials:
+        github: staccDOTsol
+pypi: https://pypi.org/project/haystack-ai/
+repo: https://github.com/staccDOTsol/openzoo-mcp-server
+type: Model Provider
+report_issue: https://github.com/staccDOTsol/openzoo-mcp-server/issues
+version: Haystack 2.0
+toc: true
+---
+
+### **Table of Contents**
+
+- [Overview](#overview)
+- [Usage](#usage)
+
+## Overview
+
+[OpenZoo](https://openzoo.fun) is an OpenAI-compatible inference provider with
+no account or signup: a small local proxy (`npx openzoo`, serving
+`http://localhost:8402/v1`) pays for each request via the x402 protocol from a
+local burner wallet. The proxy ignores the API key, so any non-empty value
+works.
+
+Because the API is OpenAI-compatible, it works with Haystack's built-in
+`OpenAIGenerator` and `OpenAIChatGenerator` — no extra package is needed.
+
+The model catalog at `http://localhost:8402/v1/models` is free to fetch and
+includes per-model pricing and context metadata. Model ids are bare model
+names, e.g. `claude-sonnet-5` or `gpt-4o-mini`; `auto` lets the proxy pick a
+model per request.
+
+## Usage
+
+Install Haystack and start the OpenZoo proxy:
+
+```bash
+pip install haystack-ai
+npx openzoo   # serves http://localhost:8402/v1
+```
+
+`npx openzoo address` prints the proxy's wallet — fund it with USDC on Solana
+or Base; `npx openzoo balance` shows what is left.
+
+Use OpenZoo with `OpenAIChatGenerator` by pointing `api_base_url` at the
+proxy. The API key can be any non-empty value (the proxy ignores it):
+
+```python
+from haystack.components.generators.chat import OpenAIChatGenerator
+from haystack.dataclasses import ChatMessage
+from haystack.utils import Secret
+
+generator = OpenAIChatGenerator(
+    api_key=Secret.from_token("sk-openzoo"),  # ignored by the proxy
+    api_base_url="http://localhost:8402/v1",
+    model="auto",
+)
+
+response = generator.run(messages=[ChatMessage.from_user("Explain x402 in one sentence.")])
+print(response["replies"][0].text)
+```
+
+The hosted endpoint `https://api.openzoo.fun/v1` answers HTTP 402 unless the
+caller pays x402 or presents an OpenZoo subscription key (`ozk_live_…`);
+Haystack cannot pay x402 itself, so use the local proxy.
+
+Streaming works through the standard `streaming_callback` parameter, since the
+endpoint supports SSE.