Base URL

The single host behind every cheapaimodel endpoint, and the exact base URL each SDK and tool expects.

Every endpoint lives on one host:

https://api.cheapaimodel.ai

There is no regional host and no separate host per provider. The same API key and the same balance work for both wire formats below.

Which value to use

OpenAI-style clients expect the base URL to include /v1; Anthropic-style clients expect the bare host and append /v1/messages themselves.

Wire format	Base URL	Requests go to
OpenAI-compatible	`https://api.cheapaimodel.ai/v1`	`/v1/chat/completions`, `/v1/responses`, `/v1/embeddings`, `/v1/models`
Anthropic Messages	`https://api.cheapaimodel.ai`	`/v1/messages`

Client	Setting	Value
OpenAI SDK (Python)	`base_url`	`https://api.cheapaimodel.ai/v1`
OpenAI SDK (TypeScript)	`baseURL`	`https://api.cheapaimodel.ai/v1`
OpenAI SDKs via environment	`OPENAI_BASE_URL`	`https://api.cheapaimodel.ai/v1`
LangChain (Python / TypeScript)	`base_url` / `configuration.baseURL`	`https://api.cheapaimodel.ai/v1`
LlamaIndex	`api_base` in `OpenAILike`	`https://api.cheapaimodel.ai/v1`
Vercel AI SDK	`baseURL` in `createOpenAICompatible`	`https://api.cheapaimodel.ai/v1`
LiteLLM	`api_base` (model `openai/<id>`)	`https://api.cheapaimodel.ai/v1`
Anthropic SDK (Python / TypeScript)	`base_url` / `baseURL`	`https://api.cheapaimodel.ai`
Anthropic SDKs via environment	`ANTHROPIC_BASE_URL`	`https://api.cheapaimodel.ai`
Claude Code	`ANTHROPIC_BASE_URL`	`https://api.cheapaimodel.ai`
Codex CLI	`base_url` in `config.toml`	`https://api.cheapaimodel.ai/v1`
Cursor	Override OpenAI Base URL	`https://api.cheapaimodel.ai/v1`
Cline	Base URL	`https://api.cheapaimodel.ai/v1`
Continue	`apiBase` in `config.yaml`	`https://api.cheapaimodel.ai/v1`
Zed	`api_url` in `settings.json`	`https://api.cheapaimodel.ai/v1`
Aider	`OPENAI_API_BASE` or `--openai-api-base`	`https://api.cheapaimodel.ai/v1`
Open WebUI	URL of the OpenAI API connection	`https://api.cheapaimodel.ai/v1`
Dify	API Base URL (OpenAI-API-compatible)	`https://api.cheapaimodel.ai/v1`
n8n	Base URL in the OpenAI credential	`https://api.cheapaimodel.ai/v1`
OpenClaw	`baseUrl` in `models.providers`	`https://api.cheapaimodel.ai/v1`
curl	full URL	`https://api.cheapaimodel.ai/v1/<endpoint>`

/v1 on an Anthropic client. The SDK appends /v1/messages, so the request goes to /v1/v1/messages and fails with 404 and Invalid URL (POST /v1/v1/messages). Use the bare host.
Missing /v1 on an OpenAI client. The request goes to /chat/completions, which is not an API path, and fails with 404 and the plain-text body fault filter abort instead of JSON. Add /v1.
The endpoint path in the base URL. Set https://api.cheapaimodel.ai/v1, not https://api.cheapaimodel.ai/v1/chat/completions; the SDK adds the path, and the doubled path fails with 404.
The site or console host. cheapaimodel.ai and console.cheapaimodel.ai serve web pages, not the API.

Once the base URL is right, send your key as described in Authentication & API keys.