IPO offerings, events stream, and indications of interest

Broker API

Adds IPO support to the Broker API:

• List IPO offerings with availability and ticker filters, and retrieve a single offering by its offering_reference.
• A new SSE stream for IPO offering lifecycle events.
• A new ipo value on the asset class enum for IPO indications of interest. IPO indications are notional-only (notional required, qty omitted), buy-side, market type, and gtc time in force, and can be submitted, replaced, and canceled through the order endpoints while the offering is open.

Affected Endpoints

• GET /v2/events/ipos
• GET /v1/ipos
• GET /v1/ipos/{offering_reference}
• POST /v1/trading/accounts/{account_id}/orders
• PATCH /v1/trading/accounts/{account_id}/orders/{order_id}

Trading API

Adds a new ipo value on the asset class enum for IPO indications of interest. IPO indications are notional and can be submitted and replaced through the order endpoints by providing a notional value; qty and notional remain mutually exclusive on a single replace request. Non-IPO notional orders still cannot be replaced.

Affected Endpoints

• POST /v2/orders
• PATCH /v2/orders/{order_id}
• GET /v2/orders
• GET /v2/orders/{order_id}