2 years ago, Saudi Arabia quietly canceled the ‘petrodollar’ deal with America that wired the world economy for 50 years. Then war broke out in Iran

Dollar share of global FX reserves has fallen to ~57% (from 71% in 1999) amid the Iran war and signs Gulf producers are trading oil outside the dollar; 20% of global oil flows transit the Strait of Hormuz and some shipments reportedly are paying in yuan. Saudi moves include a 2023 $7bn currency swap with China and participation in the mBridge payments platform; Gulf states hold >$2tn in U.S. assets but require an estimated $800bn in reserves to defend dollar pegs. China consumes ~15–16.6 mbpd (~15–16% of world demand) and has built infrastructure (Shanghai crude contract, digital payment rails) to support a petroyuan, meaning sustained conflict or Iranian control of the Strait could accelerate de-dollarization, while U.S. control would likely preserve the petrodollar.

Analysis

A gradual shift of oil invoicing and settlement away from the incumbent global currency will not collapse the system overnight, but it changes the marginal buyer/seller dynamics that set term premia and FX convenience yields. If a material share of hydrocarbon receipts migrates into alternative currency-denominated assets, expect a persistent upward pressure on long-dated real yields in the incumbent currency through a reduced natural demand curve and higher volatility in sovereign funding windows.

The transactional plumbing that enables non-incumbent currencies to scale — direct swap lines, faster RTGS rails, blockchain-based settlement — lowers frictions for trade invoicing and raises the elasticity of reserve allocations. That simultaneously creates demand for alternative sovereign or quasi-sovereign fixed income in the receiving currency, shifts trade-credit intermediation to different banking hubs, and creates a multi-decade runway for market-share gains without needing a full geopolitical regime shift.

Timing is layered: days-to-weeks for episodic shocks (naval incidents, sanctions escalations) that spike volatility and commodity spreads; months for larger invoicing experiments and contract switches; years for reserve reallocation and depth-building of new bond markets. Reversal catalysts are clear and discrete — credible security assurances, large-scale coordinated asset purchases, or durable liquidity backstops by the incumbent — meaning this is a slow-moving structural trade with punctuated tail-risk events rather than a single binary outcome.

Key Decisions for Investors

• Pair trade (3–12 months): Long Chinese large-cap exposure (FXI) vs short dollar strength via UDN (Invesco DB US Dollar Index Bearish Fund). Conviction: if invoicing and settlement continue to internationalize, FXI should capture growth from increased regional trade flows while UDN profits from marginal dollar depreciation; position size 3–5% NAV, stop-loss at 8% adverse move. Reward scenario: 1.5–3x return if structural reallocation accelerates; risk: sharp Fed-driven USD rallies.
• Directional oil/energy hedge (0–6 months): Long XLE (energy large caps) as insurance against supply-chain-driven oil spikes from trade-route friction. Use 6– to 12-week out-of-the-money call spreads to cap premium. R/R: limited premium for large payoff if geopolitics disrupts flows; downside: premium loss if markets calm.
• Carry/currency play (1–3 years): Accumulate selective exposure to high-quality offshore assets denominated in the rising settlement currency — direct ADRs of large energy buyers (e.g., PTR) and liquid China equity ETFs (ASHR/FXI) — financed with a modest short USD funding leg. Target carry of 200–400bps annualized; size 4% NAV, haircuts for sudden capital controls.
• Tail insurance (days–months): Buy Brent/WTI call spreads or long-dated gold (GLD or gold calls) as asymmetrical hedges against rapid escalation that would both spike oil and accelerate reserve reallocation. Keep allocation small (1–2% NAV) for large convex payoff with defined downside (option premium).