The GSR is a different kind of macro variable than its constituents. Gold and silver individually move with real rates, dollar, and risk regime; the ratio strips out the common factor and isolates the relative-value channel. Three distinct user groups benefit from a clean instrument.

• Macro allocators using the GSR as a regime indicator can take the view directly rather than through proxy baskets. The classic 80-rule trade (ratio above 80 implies silver is undervalued; below 50 implies overvalued) becomes a single-position expression rather than a two-leg construction with leg risk on each roll.
• Volatility and dispersion desks get an instrument whose realized vol is the spread between two correlated assets — typically 40-60% of either leg's standalone vol, with a different vol surface than either constituent. Options on a ratio perp (once liquidity supports them) become the cleanest expression of relative precious-metals vol, which currently has no liquid quote.
• Carry traders get a transparent, standardized view of the lease-rate differential between gold and silver — historically the most actionable part of the metals carry surface. The funding rate on the perp IS the differential (plus a small premium term), exposing the carry in real-time at retail-tick granularity.

The deeper utility is that the perp turns a multi-leg structural trade into a single-tick product. That changes who can hold the trade. A two-leg spread requires a futures account, leg-by-leg fills, and active roll management. A perp can sit in a CFTC-regulated derivatives account that retail brokers now route to — the same plumbing the Kalshi BTCPERP and the CME spot-quoted futures use. The total addressable book for a GSR view expands materially when the friction collapses.

A trader expressing a GSR view today picks one of three venues, each with a distinct cost-and-friction profile. The proposed perp doesn't eliminate the others — it adds a fourth point that the existing three triangulate around.

Two-leg COMEX cleared spread (GC + SI)

One GC contract represents 100 troy ounces; one SI contract is 5,000 ounces. At gold $3,500 and silver $60.34, a dollar-neutral pair is roughly 1 GC long against 1.21 SI short. The bid-ask at top-of-book is 1 tick on both legs — $10 on GC and $25 on SI — so a round-trip on a sized two-leg pair pays roughly $10 + (1.21 × $25 × 2) = ~$80 per GC contract round-trip on the SI side alone. CME's inter-commodity offset credits 67% of the smaller leg's IM against the larger, so net margin runs roughly 45-55% of gross — still two separate clearing-position cuts, two roll events per quarter, and live leg risk during fills.

ETF pair (GLD / SLV or equivalents)

Long GLD, short SLV (or the IAU/SIVR substitutes) expresses the same view with equity-style execution. Combined expense ratios run 40-50 bps; the round-trip bid-ask is typically 5-10 bps depending on retail vs institutional venue; tax treatment is unfavorable (collectibles rate for the gold ETFs, ordinary income on the silver side); and tracking error against the COMEX front month runs 50-150 bps depending on storage costs and authorized-participant flow. Best fit for buy-and-hold portfolios where the carry friction is small relative to the holding horizon.

GSR perpetual (proposed)

One fill, one CCP, one position. The perp marks against the COMEX GC/SI front-month VWAP index; funding is paid every 8 hours and is anchored to the cash-carry math below. Bid-ask at top-of-book is one perp tick — modeled here at 0.05 ratio points on a $1,000-per-point multiplier, so $50 round-trip per contract. Initial margin launches at roughly 50% of the average single-leg IM, materially below the two-leg net. No monthly roll. The carry is embedded in funding rather than in roll cost, which has the property of being transparent rather than buried in the curve.

The dashboard's Arbitrage triangle view further down ranks the three venues by all-in cost in basis points of notional under the inputs you choose. At the modal regime, the perp wins on cost; at extreme lease-rate differentials the funding stream can flip the ranking, which is the entire point of the carry-anchored design.

The cleanest version of the cost case is the bid-ask. Top-of-book on COMEX GC and SI sits consistently at 1 tick — $10 and $25 respectively — which is among the tightest in any commodity market. The problem is not the per-leg tightness; it is that a ratio-neutral two-leg trade necessarily crosses two top-of-books.

At current prices, a 1-lot GC long against the dollar-neutral SI short carries a round-trip cost of $10 (GC) + $25 × 1.21 × 2 (SI) = $70.50 per cycle, before any slippage. Scale that to 25 lots and a quarterly book — assume one round-trip every month between entry and exit — and you're paying ~$2,115 in pure top-of-book bid-ask on a position that nets to roughly $60,000 of ratio notional. That's 3.5% of notional per year just in bid-ask, before commissions, before slippage on size, and before the roll cost.

A single perp with a 0.05-ratio tick and a $1,000 multiplier ($50 per tick) on the same 25-lot position pays $50 × 25 × 2 = $2,500 per round-trip — but compared to the two-leg, you're paying it once per cycle, not twice (one round-trip rather than two synthetic round-trips covering both legs). And critically, you're not paying any of it at roll. The bid-ask saving compounds with holding frequency: shorter holds favor the perp by a wider margin; longer holds compress the advantage but never reverse it.

The reference index is the GC/SI front-month VWAP, sampled in real time during U.S. and London trading windows. The proposed methodology:

• Source. CME Globex executed trade prints for the active month of each contract. GC is GC futures (100 oz); SI is SI futures (5,000 oz). Both are electronically traded, cleared, and the deepest liquidity pool for each metal.
• VWAP window. A rolling 5-minute volume-weighted average price for each leg, refreshed every 5 seconds. The window is wide enough to absorb single-tick noise and narrow enough that the index tracks the live market within a tick.
• Ratio computation. Index = VWAP(GC) / VWAP(SI), to four decimal places. Published at the same 5-second cadence.
• Roll handling. Both GC and SI roll on a defined schedule (the second-to-last business day of the month preceding the contract month). On the roll date, the VWAP window weights blend the expiring and next active months on a volume-share basis — the same convention CME uses for the existing GC/SI inter-commodity spread. No manual roll, no discontinuity, no game-able window.
• Settlement-window discipline. Daily mark-to-market uses the 4:00 PM ET close of the index (CME settlement close for both metals), and the perp NAV calculation follows the same 4:00 PM print. There is no monthly or quarterly final settlement — the contract is perpetual.
• Cross-checks. Two sanity bands: (a) the index cannot deviate from the LBMA AM/PM gold fix and London silver fix ratio by more than 75 bps without triggering a methodology review notification; (b) when CME publishes a settlement price for either contract, the index reconciles to the published settlement at the close.

The choice of COMEX over LBMA as the primary source is deliberate. COMEX is transaction-priced, electronically traded, and continuously settled — exactly the properties a high-frequency perp index needs. LBMA fixes are auction prints (twice daily) and not directly tradeable at the print. They serve as the cross-check, not the primary.

Cost-benefit compares the perp against the two-leg cleared spread over a chosen hold period, including bid-ask, funding, monthly roll cost, and margin. Funding mechanics decomposes the funding rate into its cash-carry and premium components and projects cumulative funding paid by a long over the hold. Arbitrage triangle ranks the perp, the two-leg, and the ETF pair by all-in cost in basis points of notional. Each subsequent section below refers back to a specific view.

The funding rate is the single design choice that separates a perpetual that behaves like its underlying from one that drifts. Two philosophies dominate the existing CFTC-regulated perp landscape:

• Premium-only (Hyperliquid-style). Funding = α × (perp_mark − index) / index. Simple, well-tested on crypto. Doesn't require lease-rate inputs. Works because the underlying carry on crypto is approximately zero, so the mark-anchoring force is the only economic content needed.
• Cash-carry (CME spot-quoted style). Funding = the real economic carry of holding the synthetic position. For a metals ratio, that's the lease-rate differential plus storage net. Rigorous, defensible, but ignores the live order-book signal that a premium term provides.

The proposed contract uses the hybrid form:

The first term is the cash-carry anchor. A long GSR position is economically equivalent to long-G / short-S. The position holder pays the silver lease (cost to borrow silver for the synthetic short), receives the gold lease (earned by lending the synthetic long gold), and pays the storage differential (gold storage typically exceeds silver storage by a small margin in modern vault economics). Net of these, the long pays the differential — the standard cash-carry-equilibrium funding for a metals ratio swap.

The second term is the premium-discipline overlay. α is set deliberately small (α = 0.10 in the strawman) so that the mark-anchoring force operates without overwhelming the carry economics. When the perp drifts above the index by 1%, longs pay an extra 10 bps per period on top of the carry — enough to attract arbitrage from the cash-carry hedger, not enough to dominate the underlying economics.

Try the dashboard's Funding mechanics tab above. Push the silver lease rate up to 8.5% (the "Silver squeeze" preset) and watch the annualized funding climb past 7%/year — that's a long-GSR holder paying the carry to a long-S / short-G physical hedger, in real time, at 8-hour cadence. The cumulative-funding chart at the bottom of that tab shows the dollar amount a long pays (or receives) over the chosen hold period; in the silver-squeeze regime, a 25-lot long pays roughly $7,400 in funding over 30 days — visible on the chart as the curve descending steadily through the period.

Operational details

Lease-rate source. The contract references the LBMA-published implied lease rates (derived from forward swap quotes against SOFR), with a daily fix at 4:00 PM London. The LBMA stopped publishing GOFO directly in 2015 and SIFO in 2012, but the World Gold Council's Gold Deposit Rate framework provides a published, methodology-transparent successor. Where the LBMA published rate is unavailable for a fix window, the contract falls back to the median of three named bullion-bank-published lease quotes (the same fallback construction CME uses for the existing precious-metals lease swap product).

Storage net. Modeled at 35 bps annualized (gold − silver), reflecting the difference in vault, insurance, and handling cost per dollar of notional. The number is small and slow-moving; a quarterly recalibration against published vault tariffs keeps it current without introducing intra-period noise.

Funding cadence. Every 8 hours, mirroring the CFTC-approved Kalshi BTCPERP cadence. Funding is paid in cash at the funding event; the position holder's margin balance adjusts directly. No skewed-snapshot risk, no clustering of liquidations at funding events.

The two-leg cleared spread on CME already receives a 67% inter-commodity offset on GC × SI when held in a 1:1 ratio. That offset materially reduces the gross IM but does not eliminate the operational cost of running two separate cleared positions: two leg-level margin balances, two roll events per quarter, two CCP risk packages.

A single GSR perp launches with margin modeled as ~50% of the average single-leg IM — a typical haircut for a new perpetual product, neither aggressive nor conservative. The dashboard's Cost-benefit tab above quantifies this explicitly under any input you choose; the modal regime (25 lots at the base scenario) shows roughly the following margin and round-trip cost picture:

Empirically, the savings in capital efficiency are a modest contributor to the cost case (~24% lower IM at the modal regime); the larger wins are operational (one CCP, one margin balance) and cognitive (no leg risk, no roll calendar). The cost-benefit panel of the dashboard makes this comparison directly — drag the hold period to 90 days and watch the two-leg roll cost compound while the perp's only additional charge is funding, which depends on the carry regime, not on time-in-position alone.

The Arbitrage triangle view ranks the three venues by all-in cost in basis points of notional. In the base scenario, the perp wins by 5-15 bps depending on hold length; at extreme funding regimes (silver squeeze, ratio dislocation), the two-leg cleared structure can win temporarily as the perp's carry catches up to the physical lease-rate differential. That oscillation is exactly the signal a relative-value desk would trade against.

• Lease-rate quote integrity. The post-2015 lease-rate quote environment is less standardized than the LBMA-published era. The fallback to a median of three named bullion-bank quotes is the standard methodology, but it introduces a non-zero gaming surface around funding-event windows. Mitigant: use the daily 4:00 PM London fix, not intra-day, for the funding rate input; cap any single funding event at ±25 bps per period regardless of input.
• Index roll mechanics. The 5-minute VWAP roll convention is the same one CME uses, but a perpetual product is more sensitive to roll discontinuities than a quarterly expiring contract. Stress-test the roll math against high-volatility days and against the second-to-last business day liquidity pattern explicitly.
• Storage-net staleness. Modeling storage net at 35 bps is current, but vault economics shift over multi-year horizons. A quarterly recalibration cadence is sufficient under normal conditions; in regime changes (a major vault consolidation, a tariff change on physical metal) the recalibration cadence may need to compress.
• Funding-event clustering. Crypto perps have experienced liquidation cascades clustered around funding events. The cash-carry anchor on this contract reduces the magnitude of funding shocks (the carry term is slow-moving, the premium term is small), but the structural risk exists. Tier the funding cap by market state — wider in normal vol, narrower in stress.
• Liquidity bootstrap. A new perpetual on a non-crypto underlying needs designated market makers at launch. The CME spot-quoted futures playbook (fee waivers for designated MMs, volume-tiered rebates, two-sided quoting obligations) is the right template. Without it, the bid-ask advantage over the two-leg disappears in practice.

The dashboard's arbitrage triangle stress-tests several of these failure modes implicitly: extreme silver-lease scenarios show the perp losing its cost advantage to the two-leg cleared structure, which is exactly the regime in which a real-world launch would face liquidity strain. Use it as a sanity check before sizing.

• CME Group — Spread Trading Opportunities with Precious Metals (GC/SI tick sizes, 67% offset)
• CME Group — Spot-Quoted Futures (financing-adjustment convention; perpetual-like design)
• Monetary Metals lexicon — GOFO, SIFO, lease-rate decomposition
• World Gold Council — Gold Deposit Rates (the post-LBMA reference framework)
• GoldSilver — GSR historical range, mean reversion framework, the 80-rule
• CFTC — Kalshi BTCPERP approval order (May 29, 2026 — the regulatory template)
• CME Group — COMEX gold and silver liquidity (1-tick top-of-book bid-ask reference)