> ## Documentation Index
> Fetch the complete documentation index at: https://docs.blockhouse.app/llms.txt
> Use this file to discover all available pages before exploring further.

# Step 4: Credentials

> Connect your prime broker and each exchange, from the sub-accounts to the API keys.

> [!WARNING]
>
> For your security, nothing you enter on this step is saved until you submit it. Keep your keys somewhere safe, such as a password manager, until then.

Your funds are held on the exchanges, in your [sub-accounts](https://docs.blockhouse.app/reference/glossary.md#sub-account). For security and efficient margin rebalancing, the strategy moves funds between them through a [prime broker](https://docs.blockhouse.app/reference/glossary.md#prime-broker), so your prime broker opens each sub-account. Follow your prime broker's guide: it covers its transfer key, then each exchange the strategy uses.

## Choose your prime broker

> **[BIT](https://docs.blockhouse.app/open-an-account/connect-your-exchanges/prime-brokers/bit)**
>
> Transfer key, then each exchange. BIT creates the OKX and Bitget keys for you.

> **[LTP](https://docs.blockhouse.app/open-an-account/connect-your-exchanges/prime-brokers/ltp)**
>
> Transfer key, then LTP provisions a DMA sub-account and its keys on each exchange.

> **[Bequant](https://docs.blockhouse.app/open-an-account/connect-your-exchanges/prime-brokers/bequant)**
>
> Transfer key, then Bequant opens an account on each exchange and creates its keys, except Kraken's, which you create.

> **[FalconX](https://docs.blockhouse.app/open-an-account/connect-your-exchanges/prime-brokers/falconx)**
>
> Transfer key, then a sub-account on Binance, Bybit and OKX. FalconX creates the OKX keys for you.

## Submit

Once your prime broker and every exchange tab are filled in, choose **Continue**, tick both boxes in **Confirm Information**, then choose **Submit & Continue**.

<video autoPlay src="https://mintcdn.com/blockhouse/lG-XTofc-2encmxB/images/onboarding-submit-credentials.mp4?fit=max&auto=format&n=lG-XTofc-2encmxB&q=85&s=b666fd39ebfdf360c80bd3cea6e37973" aria-label="Confirm Information, then Submit & Continue" />

> [!TIP]
>
> Most key problems come from the IP whitelist. Each key needs its own list: the **Read-only API IPs** on the read-only key, the **Trading API IPs** on the trading key, and the **Transfer API IPs** on your prime broker's transfer key. Copy each list in full. If a key doesn't work, see [API key problems](https://docs.blockhouse.app/open-an-account/troubleshooting.md#api-key-problems).

> [!WARNING]
>
> Set up each key exactly as your guide describes. Once the strategy is running, don't change a key, its IP list or an account setting on the exchange: a change while the strategy trades can seriously disrupt it. If something needs to change, use [Edit venues](https://docs.blockhouse.app/manage/change-venues.md) so the desk can review the change first.

Every field, list and permission is in [API keys and IP addresses](https://docs.blockhouse.app/reference/api-keys-and-ip-addresses.md).


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