Since the testnet is a synthetic environment, it does not mirror the liquidity of the live platform. However, you can still simulate trade executions by placing orders between your main testnet account and a subaccount. In this sense, you effectively become your own counterparty however as the test-net does not use real cryptocurrency/money, there is no financial risk involved.
Step-by-Step Guide:
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Create a Subaccount
Follow the guide here: Subaccounts
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Enable Self-Matching
Ensure self-matching is allowed by adjusting your settings: Trading Account settings
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Fund Your Accounts
Use synthetic Dericoins to fund your testnet accounts. You can deposit test funds easily: Depositing test funds to your testnet account
Matching Trades
Once everything is set up:
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Place a limit order from your main testnet account on a selected instrument.
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Log into your subaccount, go to the same instrument, and place a market or opposite limit order to match the trade.
Note
Self-matching only works if the self-match prevention setting is disabled. Make sure it’s configured correctly in your account settings.
This way, you act as your own counterparty to simulate fills—perfect for testing trading logic, APIs, or order behavior.