Neon API (unofficial showcase)
GET/projects/{project_id}/branches/{branch_id}/ai_gateway

Get branch AI Gateway endpoint

Returns the AI Gateway endpoint host for the specified branch, used to render code-snippet base URLs. A 200 response means the branch is registered and this region serves the AI gateway. A 404 response includes a reason field indicating why the gateway is unavailable.

Note: This endpoint is currently in Beta.

2 parameters
project_idstringrequired
The Neon project ID
branch_idstringrequired
The Neon branch ID

3 status codes
200AI Gateway is enabled for this branch
enabledbooleanrequired
Always `true` in 200 responses. Present for forward compatibility, mirroring BranchStorage.enabled.
base_urlstringrequired
The AI-gateway endpoint root for this branch — an OpenAI-compatible base URL. No dialect path is included; clients append the route (e.g. `/ai-gateway/openai/v1/responses`) themselves.
404AI Gateway is not available for this branch, or the project/branch was not found. The body is always `BranchAiGatewayNotEnabled` — see `reason` for the exact cause.
codestringrequired
messagestringrequired
reasonstringrequired
Machine-readable reason why the AI gateway is unavailable: - `ai_gateway_unavailable`: the project's region/cell has no AI gateway configured. - `branch_not_found`: the project or branch does not exist, or the caller does not have access to it.
Allowed:ai_gateway_unavailablebranch_not_found
defaultGeneral Error. The request may or may not be safe to retry, depending on the HTTP method, response status code, and whether a response was received. - If no response is returned from the API, a network error or timeout likely occurred. - In some cases, the request may have reached the server and been successfully processed, but the response failed to reach the client. As a result, retrying non-idempotent requests can lead to unintended results. The following HTTP methods are considered non-idempotent: `POST`, `PATCH`, `DELETE`, and `PUT`. Retrying these methods is generally **not safe**. The following methods are considered idempotent: `GET`, `HEAD`, and `OPTIONS`. Retrying these methods is **safe** in the event of a network error or timeout. Any request that returns a `503 Service Unavailable` response is always safe to retry. Any request that returns a `423 Locked` response is safe to retry. `423 Locked` indicates that the resource is temporarily locked, for example, due to another operation in progress.
request_idstringoptional
Unique identifier for the request, useful for debugging. You can set this value manually by including an `X-Request-ID` header in the request. If not provided, the value will be generated automatically.
codestringrequired
Machine-readable code classifying the error type. See `message` for a human-readable explanation.
Default:
messagestringrequired
Error message

Error handling

A 404 is returned: AI Gateway is not available for this branch, or the project/branch was not found. The body is always BranchAiGatewayNotEnabled — see reason for the exact cause. Any other status is an error: General Error.

The request may or may not be safe to retry, depending on the HTTP method, response status code, and whether a response was received.

  • If no response is returned from the API, a network error or timeout likely occurred.
  • In some cases, the request may have reached the server and been successfully processed, but the response failed to reach the client. As a result, retrying non-idempotent requests can lead to unintended results.

The following HTTP methods are considered non-idempotent: POST, PATCH, DELETE, and PUT. Retrying these methods is generally not safe. The following methods are considered idempotent: GET, HEAD, and OPTIONS. Retrying these methods is safe in the event of a network error or timeout.

Any request that returns a 503 Service Unavailable response is always safe to retry.

Any request that returns a 423 Locked response is safe to retry. 423 Locked indicates that the resource is temporarily locked, for example, due to another operation in progress.