Reinsurance structures

Build excess-of-loss and quota-share layers on a run; ceded/retained EP follows.

Excess of loss (XL)

limit xs attachment

· Attachment (retention) and limit (layer width)
· Per-occurrence (OEP) or aggregate (AEP) basis
· Reinstatements cap annual ceded at limit·(1+n)

POST /api/v1/runs/<run>/structures
{
  "name": "Program 2026",
  "layers": [
    { "name": "L1 XL", "layer_type": "xl",
      "attachment": 5e6, "limit": 10e6,
      "reinstatements": 2 }
  ]
}

Quota share (QS)

% cession

· Cede a flat fraction of every loss
· Proportional — no attachment/limit
· Stacks with XL in the same structure

{ "name": "30% QS", "layer_type": "qs",
  "cession": 0.30 }

Each layer is applied to the deterministic YLT (rebuilt from the run's ELT) and priced — see Pricing.