n8n

Automations. The key lives in Credentials, not the node.

Three fields. Copy, don’t type

Do it in order. Don’t skip

1. In n8n open Credentials → Add credential → OpenAI.

2. API Key: your key in full.

3. Expand Additional Options and set Base URL to https://cheapai.lol/v1 (with /v1).

4. Save. In the OpenAI node pick that credential and set Model to claude-opus-4.8.

5. Press Execute step on a short prompt.

Check

If it didn’t start

• “401 / unauthorized / invalid api key” — the key was not copied whole. It starts with sk- and has no space at either end.
• “model not found” / “named models unavailable” / model in red — the name must match exactly: claude-opus-4.8. Not “Opus 5”, not opus, not claude-3, not gpt-4.
• The app shows no models — reopen its settings page: the model list is served from our address and appears once the Base URL and key are right.
• “Connection error” / spinner and silence — wrong Base URL. Almost every app wants the address with a /v1 tail.
• “/v1/v1” in the error — the app appends /v1 itself. Drop the tail, leave the site address.
• It replied, then stopped — you ran out of tokens. The balance is in your dashboard. Topping up on FunPay from the same nick lands on the same key.

all apps