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Anything that can talk to an “OpenAI-compatible” endpoint works with Square1. The two settings are always the same:
  • Base URL — https://inference.square1.dev/v1
  • API key — your sq-arca-... key

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RisuAI

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Chat

1

Open model settings

Settings → AI Model and choose the custom / OpenAI-compatible provider type.
2

Point it at Square1

Set the request URL to https://inference.square1.dev/v1/chat/completions (or the base URL https://inference.square1.dev/v1, depending on the field RisuAI shows) and paste your key.
3

Pick a model

Enter a model id from GET /v1/models — for example deepseek-v4-pro or kimi-k2.6.
Streaming, reasoning models, and the quota receipt all work through RisuAI unchanged. If a response stops mid-generation, check your quota standing on the dashboard — 429 with session_exhausted / weekly_exhausted is the usual cause.

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Lightboard (삽화)

RisuAI’s Lightboard speaks the NovelAI protocol, and Square1 implements it directly — see the Illustration API:
  1. Configure your illustration preset on the dashboard (Images → ILLUSTRATION) — checkpoint, LoRAs, and quality settings live there.
  2. In RisuAI, set the NovelAI-compatible image endpoint to https://inference.square1.dev/v1/images/nai/generate-image with your Square1 key as the token.

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SillyTavern

Add a Custom (OpenAI-compatible) chat completion source:
  • Custom endpoint: https://inference.square1.dev/v1
  • API key: your sq-arca-... key
  • Model: any id from GET /v1/models

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Anything else

If a tool accepts base_url + api_key for OpenAI, it works — see Using OpenAI SDKs for library examples, and Errors for the codes your client should treat as retryable.
Client apps run in trusted environments (your own device). Don’t paste your key into shared or hosted frontends you don’t control — anyone holding the key spends your quota.