Hi Vercel team,

I'm trying to use Vercel AI Gateway with a valid API key and a payment method added to my account. However, all generation requests fail with HTTP 403.

What I've tested:

GET https://ai-gateway.vercel.sh/v1/models returns 200 OK.

POST /v1/chat/completions returns 403 Forbidden.

POST /v1/responses also returns 403 Forbidden.

The failed POST requests return HTML titled Vercel Security Checkpoint with the header X-Vercel-Mitigated: challenge.

Regenerating the API key did not fix the issue.

Could you please check whether my team has an AI Gateway entitlement restriction or whether the requests are being incorrectly challenged by Vercel's security layer?

Latest request ID: fra1::1792701170-0nQRzl9GOxivqhhgqAtgHmYRHM5Td7mv

Thank you.