feat(ts-sdk): return a liquidation price in trade previews - #300
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`previewOrder` now reports the mark at which the account would be liquidated once the order fills. Margin is cross, so it is an account-level number expressed in one market's mark: solve `equity(X) = Σ maintenance margin(X)` with every other mark held still. Both sides are linear in X, so there is a single root. It is undefined when no such mark exists — spot, a position that ends flat, or a root at or below zero (a long the rest of the account fully covers) — and when the snapshot carries no `maintenanceMargin` while perps in other markets contribute to it, since their margin rates cannot be derived from the single `market` the preview is given. Enriched snapshots always carry the field, so live callers get a number. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
majesticwizardcat
approved these changes
Sep 22, 2026
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previewOrdernow reports the mark at which the account would be liquidated once the order fills. Margin is cross, so it is an account-level number expressed in one market's mark: solveequity(X) = Σ maintenance margin(X)with every other mark held still. Both sides are linear in X, so there is a single root.It is undefined when no such mark exists — spot, a position that ends flat, or a root at or below zero (a long the rest of the account fully covers) — and when the snapshot carries no
maintenanceMarginwhile perps in other markets contribute to it, since their margin rates cannot be derived from the singlemarketthe preview is given. Enriched snapshots always carry the field, so live callers get a number.