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Your default trade size is the single most important setting in Cassie — it controls how much USDC the agent commits every time you mention @cassiedottrade under a market post. Getting this number right before your first trade means you won’t be surprised by a position that’s larger or smaller than you intended.

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What the default trade size controls

Every mention triggers one trade. Cassie uses your default trade size as the USDC notional for that trade across whichever venue — Hyperliquid or Polymarket — best fits the signal. Counter and watch positions inherit the same size unless a future override is specified.

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Preset options

During onboarding (Step 4 — Defaults) and in dashboard settings, Cassie offers four quick-select presets:
PresetBest for
$25New users testing Cassie’s signal interpretation
$50Default starting point for most traders
$100Moderate conviction, established workflow
$250High conviction, experienced users
You can also type any custom amount directly into the amount field. Cassie accepts any value that is a whole or decimal number.

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Minimum trade size

The absolute minimum is *6USDC∗∗.Cassiewillrejectanyvaluebelowthisflooratthesettingslevel—you′llseethemessage∗"Defaulttradesizemustbeatleast6 USDC**. Cassie will reject any value below this floor at the settings level — you'll see the message *"Default trade size must be at least 6.” if you try to save a smaller amount.
Start with $25 while you learn how Cassie reads tweet signals. You can always increase the default once you’ve seen a few trades execute and you’re comfortable with the agent’s interpretation of different market contexts.

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Where to change your default trade size

1

During onboarding

On Step 4 — Defaults, select a preset or type a custom amount, then click Save & continue. This is the fastest path on first setup.
2

From the dashboard

After onboarding, open the Settings panel in the dashboard sidebar. Update the trade size field and save. Changes take effect on the very next mention.

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How the default applies to each mention

You tweet: "@cassiedottrade trade this"
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Cassie reads the signal from the parent tweet
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Cassie selects venue (Hyperliquid or Polymarket)
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Cassie places a trade for your default trade size in USDC
There is no per-mention override syntax today — every mention uses the default. If you want to adjust size for a particular trade, update the default before posting the mention, then change it back afterwards.

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Wallet balance requirement

Your wallet must hold at least your default trade size in USDC for a trade to execute. If the available balance is below the default, Cassie skips the mention rather than trading a partial amount.
Cassie does not split a trade across multiple smaller executions. If you set a 100defaultbutonlyhave100 default but only have 60 in your wallet, the trade will not execute. Top up your wallet first.

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Next step

Connect Telegram so you receive real-time notifications whenever a trade fills or a position moves.

Connect Telegram alerts

Get notified the moment a trade executes, a position moves, or a counter triggers.