FA-84705 / Betting odds conversion / Member archive

Cash-out margin applied as a flat or grossed-up deduction · case 05

Offers differ from the stated percentage deduction.

Member previewVariant 5 · 3 implementations · 9 checks per implementation

Case contract

Cash-out offer for a single or multiple back bet. legs rows are [price taken, current] where current is a decimal price for an open leg, "won" or "lost". Any lost leg makes the offer [0, 0]. Otherwise value = stake * product of prices taken / product of current prices of open legs, reduced by margin_pct percent, rounded down to a cent. partial_cents 0 means full cash-out: return [value, 0]. A partial amount above the value returns "invalid"; otherwise return [partial, remaining stake] with remaining = floor(stake * (1 - partial / value)).

Why this case matters

Cash-out and partial cash-out offers are recomputed from live prices on every tick.

One recorded failure

Sample boundary fixture

This sample comes from the broken implementation of a controlled reproducer.

Boundary fixture	Actual	Expected	Outcome
control margin applied	`[1495, 0]`	`[1425, 0]`	Failed

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