> ## Documentation Index
> Fetch the complete documentation index at: https://docs.viviai.cc/llms.txt
> Use this file to discover all available pages before exploring further.

# Frequently asked questions

> Find answers about API keys, request URLs, model selection, and streaming.

Choose a question below, or open it directly from the Help center sidebar.

## Getting connected and choosing models

* [Which API URL should I enter?](https://docs.viviai.cc/en/help/api-format.md)
* [How do I choose a model?](https://docs.viviai.cc/en/help/choose-model.md)
* [What are the API and dashboard URLs?](https://docs.viviai.cc/en/help/service-address.md)
* [Can I use YOUR\_OPENAI\_MODEL as a model name?](https://docs.viviai.cc/en/help/model-placeholder.md)
* [Where do I put my API key for each protocol?](https://docs.viviai.cc/en/help/api-key.md)

## Troubleshooting errors

* [Why am I getting 401 or 403?](https://docs.viviai.cc/en/help/error-401-403.md)
* [Why am I getting 404 or model not found?](https://docs.viviai.cc/en/help/error-404.md)
* [Why am I getting 400 or an unsupported parameter error?](https://docs.viviai.cc/en/help/error-400.md)
* [Should I keep retrying after a 429 or timeout?](https://docs.viviai.cc/en/help/rate-limit-timeout.md)

## Usage and billing

* [How do I enable streaming?](https://docs.viviai.cc/en/help/streaming.md)
* [Does the API remember previous messages?](https://docs.viviai.cc/en/help/conversation-history.md)
* [Where can I check prices, credit, and available models?](https://docs.viviai.cc/en/help/prices-and-quota.md)

## Still need help?

Record the request time, protocol, model ID, HTTP status, error body, and request ID from the response. Remove API keys and unnecessary user data before sharing logs.

Continue reading: [Quickstart](https://docs.viviai.cc/en/index.md) · [OpenAI Chat](https://docs.viviai.cc/en/openai-chat.md) · [Gemini](https://docs.viviai.cc/en/gemini.md) · [Anthropic](https://docs.viviai.cc/en/anthropic.md)


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