# ZeroGPU guides

Documentation for using ZeroGPU's agent storefront: what it sells, how to call it, what it costs, and how to recover from errors. The storefront itself: https://agents.zerogpu.ai/zcj/jf3inqxkhvz4/llms.txt.

- [Send a chat completion with ZeroGPU's OpenAI-compatible API](https://agents.zerogpu.ai/guides/quickstart.md): Call ZeroGPU's OpenAI-compatible chat completions API through its agent storefront. Buy Credits once, set model, and each call draws on credit by its tokens.
- [ZeroGPU models by task: model ids, endpoints and rates](https://agents.zerogpu.ai/guides/models-by-task.md): The ZeroGPU model id and endpoint for chat, reasoning, classification, IAB categories and embeddings, with each model's rate.
- [Classify text and domains into IAB categories with ZeroGPU's API](https://agents.zerogpu.ai/guides/classify-iab-categories.md): Send a model id and text, or a bare domain, to ZeroGPU's API and get scored IAB 1.0 and 2.2 categories and audience segments, paid from prepaid Credits.
- [Generate text embeddings for semantic search with ZeroGPU's API](https://agents.zerogpu.ai/guides/text-embeddings.md): ZeroGPU's OpenAI-compatible embeddings endpoint returns one 384-dimension vector per input string, billed on input tokens and drawn from prepaid Credits.
- [ZeroGPU API pricing: per-token rates and Credits](https://agents.zerogpu.ai/guides/pricing-for-agents.md): ZeroGPU's text, classification and embedding model rates by meter, how a call's tokens become credit drawn, and how to buy, check and top up Credits.
- [ZeroGPU API errors and recovery through the agent storefront](https://agents.zerogpu.ai/guides/errors.md): ZeroGPU's storefront answers credential, credit and purchase errors with a JSON code; ZeroGPU answers its own after forwarding. Each entry gives the fix.
- [Can AI agents buy from ZeroGPU?](https://agents.zerogpu.ai/guides/can-ai-agents-buy-from-zerogpu.md): Yes. AI agents buy ZeroGPU credit with a free agent credential, pay over x402, MPP or card, and call the OpenAI-compatible API against it.