Source: https://databento.com/docs/schemas/trades


# Trades

**Trades** provides every trade event. This is a subset of [MBO](https://databento.com/docs/schemas/mbo.md).

This is often referred to as "time and sales", "last sale," or "tick data."

Databento groups this under [top of book](https://databento.com/docs/schemas/whats-a-schema.md#supported-schemas-and-their-fields) (L1).

### Fields (`trades`)

| Field | Type | Description |
| `ts_recv` | uint64\_t | The capture-server-received timestamp expressed as the number of nanoseconds since the UNIX epoch. See [ts_recv](https://databento.com/docs/conventions/common-fields-enums-types.md#ts-recv). |
| `ts_event` | uint64\_t | The matching-engine-received timestamp expressed as the number of nanoseconds since the UNIX epoch. See [ts_event](https://databento.com/docs/conventions/common-fields-enums-types.md#ts-event). |
| `rtype` | uint8\_t | A sentinel value indicating the record type. Always 0 in the trades schema. See [Rtype](https://databento.com/docs/conventions/common-fields-enums-types.md#rtype). |
| `publisher_id` | uint16\_t | The publisher ID assigned by Databento, which denotes the dataset and venue. See [Publishers](https://databento.com/docs/conventions/common-fields-enums-types.md#publishers-datasets-and-venues). |
| `instrument_id` | uint32\_t | The numeric instrument ID. See [Instrument identifiers](https://databento.com/docs/conventions/common-fields-enums-types.md#instrument-identifiers). |
| `action` | char | The event action. Always **T**rade in the trades schema. See [Action](https://databento.com/docs/conventions/common-fields-enums-types.md#action). |
| `side` | char | The side that initiates the trade. Can be **A**sk for a sell aggressor in a trade, **B**id for a buy aggressor in a trade, or **N**one where no side is specified. See [Side](https://databento.com/docs/conventions/common-fields-enums-types.md#side). |
| `depth` | uint8\_t | The book level where the update event occurred. |
| `price` | int64\_t | The order price where every 1 unit corresponds to 1e-9, i.e. 1/1,000,000,000 or 0.000000001. See [Prices](https://databento.com/docs/conventions/common-fields-enums-types.md#prices). |
| `size` | uint32\_t | The order quantity. |
| `flags` | uint8\_t | A bit field indicating event end, message characteristics, and data quality. See [Flags](https://databento.com/docs/conventions/common-fields-enums-types.md#flags). |
| `ts_in_delta` | int32\_t | The matching-engine-sending timestamp expressed as the number of nanoseconds before `ts_recv`. See [ts_in_delta](https://databento.com/docs/conventions/common-fields-enums-types.md#ts-in-delta). |
| `sequence` | uint32\_t | The message sequence number assigned at the venue. |