Add OpenZoo (Model Provider, OpenAI-compatible)

[staccDOTsol]

Updated 2026-09-02: corrected — the hosted https://api.openzoo.fun/v1 endpoint answers HTTP 402 to a plain OpenAI client (it only serves calls that pay x402 or carry an OpenZoo subscription key, ozk_live_…). The page now sets up the local npx openzoo proxy (http://localhost:8402/v1), which pays x402 per call from a local burner wallet and ignores the API key.

Adds an integration page for OpenZoo, an OpenAI-compatible provider used through Haystack's built-in OpenAIChatGenerator with a custom api_base_url — the same no-extra-package shape as the existing Cerebras page.

What's distinctive (and why the example is trivially verifiable): there is no signup or real API key — the local npx openzoo proxy (api_base_url="http://localhost:8402/v1") pays per call over x402 and ignores the Secret.from_token value — so the page's snippet runs as-is once the proxy is up. The hosted endpoint is mentioned only as needing x402 or a subscription key.

Disclosure: I operate OpenZoo.

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