Run Use Wild West API in n8n
n8n's OpenAI credential has a Base URL field. Point it at Wild West API. One node setting matters: the OpenAI Chat Model node defaults to the Responses API, which Wild West API does not serve.
- Base URL
- https://wildwestapi.com/v1
- API key
- Get one free, starts sk-ww-
- Example model
- outlaw-1-xploded
The OpenAI credential
Create an OpenAI credential and set:
- API Key: your sk-ww-... key
- Base URL: https://wildwestapi.com/v1 (the field defaults to https://api.openai.com/v1)
n8n sends the key as an Authorization: Bearer header and tests the credential against /models, which Wild West API answers.
Turn off Use Responses API
The one setting that breaks it The OpenAI Chat Model node (version 1.3 and up) defaults "Use Responses API" to on, which posts to /v1/responses and 404s on Wild West API. Turn it off so the node uses Chat Completions. Built-in tools that depend on the Responses API will not be available, which is expected.
With the credential and that toggle set, the OpenAI Chat Model node feeds the AI Agent node as normal. Pick a tool-capable model if the agent uses tools.
