This read-only endpoint returns the AI Gateway host for a branch as base_url. No dialect path is included, so append the route your client needs, for example /v1 for chat completions. Each branch gets its own host, so requests from a preview branch stay scoped to that branch.
A 404 includes a reason field explaining why the gateway is unavailable.
Authenticating to the gateway uses a scoped credential with the ai_gateway:invoke scope, not your Neon API key.
AI Gateway requires a paid plan and is currently available in AWS US East (Ohio), US East (N. Virginia), Europe (Frankfurt), and Asia Pacific (Singapore). Support is expanding toward all regions. See AI Gateway for supported models and Chat completions for the request format.