CFDL

Curves

curve declares a named, date-indexed series — rate curves, price decks, escalation paths — read from expressions with curve_value(name, date).

curve sofr linear {
  2026-01: 0.050
  2027-01: 0.038
}

stream loan.interest on entity fund.buyer inflow currency USD {
  schedule every monthly from 2026-01 to 2026-12
  amount = 1000000 * (curve_value("sofr", time.date) + 0.0275) / 12
}

Interpolation

  • step — flat-forward: each value holds until the next point.
  • linear — calendar-day interpolation between points.
  • Lookups outside the range clamp to the first/last point.

Duplicate curve names, duplicate point dates, or malformed points fail compilation with E5008_INVALID_CURVE.

Where curves shine

The credit pack's floating-rate pools read their coupon index from a named curve with margin, floor, and cap:

contract credit.pool_float_io_bullet.bridge on entity fund.buyer {
  term 2026-01..2029-05
  terms {
    balance = 15000000
    index_curve = "sofr"
    margin = 0.0275
    rate_floor = 0.07
    rate_cap = 0.09
    term_months = 36
  }
}

Curves are deterministic inputs today; per-trial stochastic rate paths are on the roadmap.

Reference links