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NextChat

NextChat (ChatGPT-Next-Web) is an open-source ChatGPT web client. It speaks the OpenAI protocol, so connecting it to MirAPI works like any other OpenAI-compatible tool: one base URL and one key.

What you need

Section titled “What you need”
Element Value
Base URL https://api.mirapi.ai/v1
API key Your MirAPI key (sk-...)
Model deepseek-chat

NextChat appends /chat/completions to the base URL and authenticates with Authorization: Bearer. Its custom endpoint expects an OpenAI-compatible API, so only the OpenAI base URL applies here — the Anthropic and Gemini base URLs are not used.

Configure

Section titled “Configure”

Option A — Deploy variables

Section titled “Option A — Deploy variables”

Set these in your deployment environment:

Terminal window
BASE_URL="https://api.mirapi.ai/v1"
OPENAI_API_KEY="sk-..."

NextChat reads the key from OPENAI_API_KEY and the endpoint from BASE_URL. Restart the app after changing them.

Option B — Settings page

Section titled “Option B — Settings page”
  1. Open Settings → Custom Endpoint (OpenAI) (newer versions: Model Provider).
  2. Set the interface address to https://api.mirapi.ai/v1.
  3. Enter your MirAPI key (sk-...) and set the default model to deepseek-chat.

Verify with a message

Section titled “Verify with a message”

Send:

Reply with exactly: connected to MirAPI

Expect the exact phrase in the reply.

Tool-specific pitfalls

Section titled “Tool-specific pitfalls”
  • Keep /v1 in the endpoint — NextChat appends /chat/completions, so https://api.mirapi.ai/v1 becomes https://api.mirapi.ai/v1/chat/completions.
  • The model selector is not fetched from the API. NextChat shows its built-in list plus CUSTOM_MODELS; add deepseek-chat with CUSTOM_MODELS=-all,+deepseek-chat (or type the exact name) instead of waiting for it to appear.
  • Model names are verbatim — use the exact id from GET /v1/models; the vendor/ prefix is for browsing and filtering in the console, never in a request.
  • 403 with a valid key means the model is not on the whitelist or the balance is exhausted — top up and retry. 401 means the key is missing, invalid, or unknown.
  • The in-app endpoint wins over BASE_URL — a custom endpoint saved in the browser takes precedence over the deploy variable, so if requests keep going elsewhere, clear or fix it on the settings page first.
Section titled “Related links”