---
tags: Client library
order: 2
---

# Data Module of Bandchain.js

This module is to construct the data in term of dataclass to make sure that all the input and output follow this data schema.

Although there are Protobuf classes, some types are not exists. Therefore, additional types of data will be declared here.

Note that `base` and `quote` is the first and the second price symbols respectively e.g. BTC/USD price rate has a base of BTC and a quote of USD.

## `ReferenceDataRequestID`

| Attribute | Type | Description |
| --------- | ------- | ------------------ |
| `base` | integer | Base's request ID |
| `quote` | integer | Quote's request ID |

## `ReferenceDataUpdated`

| Attribute | Type | Description |
| --------- | ------- | -------------------- |
| `base` | integer | Base's resolve time |
| `quote` | integer | Quote's resolve time |

## `ReferenceData`

| Attribute | Type | Description |
| ----------- | ------------------------ | ------------------------------ |
| `pair` | string | The token pair e.g. "BTC/USD" |
| `rate` | float | Price rate |
| `updatedAt` | [ReferenceDataUpdated] | Price update time |
| `requestId` | [ReferenceDataRequestID] | OracleRequest ID |

[referencedataupdated]: #referencedataupdated "ReferenceDataUpdated"
[referencedatarequestid]: #referencedatarequestid "ReferenceDataRequestID"