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+---
+parent: Connecting to LLMs
+nav_order: 500
+---
+
+# OpenZoo
+
+Aider can connect to [OpenZoo](https://openzoo.fun), an OpenAI compatible
+provider with no account: a small local proxy (`npx openzoo`) pays for each
+request via the x402 protocol from a local burner wallet, and aider talks to
+the proxy like any other OpenAI compatible endpoint.
+
+First, install aider:
+
+{% include install.md %}
+
+Then start the OpenZoo proxy and point aider at it:
+
+```
+npx openzoo   # serves http://localhost:8402/v1
+
+# Mac/Linux:
+export OPENAI_API_BASE=http://localhost:8402/v1
+export OPENAI_API_KEY=sk-openzoo   # the proxy ignores the key; any non-empty value
+
+# Windows:
+setx OPENAI_API_BASE http://localhost:8402/v1
+setx OPENAI_API_KEY sk-openzoo
+# ... restart shell after setx commands
+```
+
+`npx openzoo address` prints the proxy's wallet — fund it with USDC on Solana
+or Base; `npx openzoo balance` shows what is left.
+
+Start working with aider and OpenZoo on your codebase:
+
+```bash
+# Change directory into your codebase
+cd /to/your/project
+
+# Prefix the model name with openai/
+aider --model openai/z-ai/glm-5.3-flash
+```
+
+The free model list at `http://localhost:8402/v1/models` shows every
+available model id with live pricing.
+
+The hosted endpoint `https://api.openzoo.fun/v1` answers HTTP 402 unless the
+caller pays x402 or presents an OpenZoo subscription key (`ozk_live_…`);
+aider cannot pay x402 itself, so use the local proxy.
+
+See the [model warnings](warnings.html)
+section for information on warnings which will occur
+when working with models that aider is not familiar with.