# CallUsage

**Kind:** interface  
**Defined in:** `packages/zappier/src/pricing.ts`

## Fields

| Field | Type | Meaning |
|-------|------|---------|
| `metadataBytes` | `number` | UTF-8 length of metadata JSON |
| `attachmentBytes` | `number` | Sum of uploaded file sizes |

## Who constructs it

constructed in meter middleware

## Who consumes it

`meter()`, `quoteCall()`

## Related modules

See `docs/modules/` for the functions that take these types as parameters and the values they return.