> For the complete documentation index, see [llms.txt](https://docs.reya.xyz/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.reya.xyz/developers/devnet/getting-started/accounts-and-subaccounts.md).

# Accounts & Subaccounts

On Reya, balances, margin, and positions are organised under **accounts** that belong to your **owner wallet**.

## The account model

* A single **owner wallet** can open **as many perp accounts as you like** (subaccounts), but **exactly one spot account** — the spot account is get-or-create, so the first spot action creates it and every later one reuses the same account.
* **Each account holds its own margin, isolated from your other accounts.** A loss in one account cannot draw on the collateral of another.
* Accounts are typed — perpetual (a main or sub perp account) or spot — and you can hold both perp and spot accounts under the same owner wallet.

## Account IDs

Every account has a numeric **`accountId`**, and that is the identifier you use throughout the API:

* It is signed into the EIP-712 `OrderDetails` you submit — see [Signatures & Nonces](/developers/devnet/authentication/signatures-and-nonces.md).
* It keys the wallet data channels and queries (positions, orders, executions, balances).

**Spot vs perp from the id alone.** Account IDs are namespaced by type: spot account IDs carry a **`10,000,000,000` (1e10) offset**, so an `accountId` **greater than `10,000,000,000` is a spot account** and anything at or below is a **perp** account.

The **owner wallet** and the **signer** are distinct from the account: the signer's key authorises actions and must be permissioned to act for the `accountId` — see [Signer Authorization](/developers/devnet/getting-started/signer-authorization.md).

## Margin isolation

* **Between accounts: isolated.** Each account is its own margin domain.
* **Within an account: shared.** Multiple positions in one account share that account's collateral and are evaluated together for margin and liquidation (see [Margin System](/developers/devnet/risk/margin-system.md)).

Use separate accounts to ring-fence strategies or risk; use one account to net positions against each other.

## No position limits

There are **no per-account or per-position size limits**. Position size is bounded by margin and a **global open-interest cap per market**, aggregated across all accounts — see [Markets & Assets](/developers/devnet/reference/markets-and-assets.md).

## Funding

Deposit collateral to an account to trade. Which assets are accepted as collateral is published by the [`assetDefinitions`](/developers/devnet/api-reference/rest-api-reference.md) endpoint — query it rather than hard-coding a list.