Paradigm’s leg pricing methodology attempts to take the quoted strategy prices as entered by the maker and calculate individual leg prices subject to the following broad constraints:
Calculate leg prices as close to the mark as possible
Leg prices must be in increments of minimum tick size
Leg prices must be within the Min and Max prescribed by the exchange for each leg
For options strategies, leg prices must preserve delta relationships:
Manual entry for individual leg prices when Paradigm is unable to calculate leg prices that are “sensical”
Currently, Paradigm does not allow zero or negative prices for the following strategies
Paradigm fees for Bullish products are free.
Log into your Bullish account
Go to Settings and click the API Keys tab
Click Add API Key and choose Trading Key
In the pop-up window, the Trade field must be enabled to use our Positions functionality. Click continue.
Enter your Key Name and click Generate
Enter 6-digit code from your Authenticator app
Save & Copy your Public & Private API Keys
Go to Trading Accounts and Copy the Account ID
On your Paradigm Dashboard, select Account tab under Derivatives (Listed) → Bullish
Click "+"
Enter a nickname for the Key. Input your Bullish API credentials (i.e. API Key, Secret Key, Account ID) you just created
Click Add
You can add multiple Bullish API keys to your Paradigm Dashboard, then toggle between keys for trading/clearing in that selected Bullish (sub)account










Please see here