# AiUsageSurfaceCalls

object type

One surface's call count inside a usage day.

## Fields

| Field | Type | Notes |
| --- | --- | --- |
| `surface` | [String](/types/#scalars) `String!` | The metered surface token — e.g. office.assistant, office.form_fill (the at.ai.call.v1 vocabulary). |
| `calls` | [Int](/types/#scalars) `Int!` | No further notes. |
| `tokensOutput` | [Int](/types/#scalars) `Int!` | The surface's OUTPUT tokens that day. |