Iran deal collapses, hike odds surge — Polymarket May 19-21

The past 46 hours delivered the biggest single-session swing on Polymarket since the Israel-Gaza ceasefire vote: the US-Iran permanent peace deal by May 31 cratered from 62% to 21%, shedding 41 percentage points as a confirmed Israeli strike settled one related market at 100% and oil whipsawed 5.6% in a single day. Simultaneously, hawkish FOMC minutes pushed year-end rate-hike odds up 14-18 points, Nvidia delivered its fifth consecutive "monster beat, flat stock" quarter, and Bitcoin found support at its 50-day moving average as ETF outflows slowed sharply. Below is the full signal set for the window.

⚠️ Insider-trading disclosure — applies to all Iran-related markets in this issue. A 60 Minutes investigation (aired May 18) and a New York Times analysis (May 13) found nine linked accounts earning $2.4 million on Iran military contracts with a 98% win rate. 1 Treat every Iran probability below as a directional signal, not a clean crowd-wisdom read.

Market snapshot

Market	Probability	24h change	Volume	Catalyst
US-Iran peace deal by May 31	21%	−41pp	$2.33M (24h) / $31M lifetime	Israel strike confirmed; Iran supreme leader bans uranium export
Israel strikes Iran by Jun 30	RESOLVED YES	—	$833K	Settlement confirmed
Iran ceasefire holds through May 21	97%	+3pp	$2.22M total	Iran FM travels to Pakistan for talks
Iran closes airspace by May 24	14%	−14pp	$24.5M total	IRGC threat then partial de-escalation
Hormuz blockade lifted by Jun 30	54%	−13pp	$19.5M total	Iran imposing $150K/ship fees
Fed hike at least once by Dec 2026	~46%	+14-18pp	—	FOMC April minutes (released May 20)
Zero Fed cuts in 2026 (Polymarket)	~70%	+2pp	$28.67M total	Hawkish minutes
BTC below $75K by May 31	56%	—	—	ETF outflows, rates pressure
Brazil: Lula wins 2026 election	~47%	+7pp	$50.2M total	Vorcaro scandal hits Flávio
Brazil: Flávio Bolsonaro wins	~28%	−15pp	$50.2M total	Vorcaro scandal
CLARITY Act passes in 2026	64%	+18pp	—	Senate Banking Committee vote 15-9

Iran: the deal is dead — for now

The dominant trade of the window was straightforward: sell May 31 peace deal. 2

The probability opened the period at roughly 62% — a residual premium from the previous session when Trump's "final stages" comment sent oil down 5.6% and briefly pushed the deal market above 60%. 3 Then the market found out Israel had already struck Iran. The "Israel strikes Iran by June 30" contract settled at 100% YES — a real-event resolution, not a technical glitch. 4 That, combined with a Reuters report that Iran's supreme leader had issued a directive prohibiting the export of near-weapons-grade uranium 5 — one of the US's core demands — collapsed the May 31 deal probability to 21%.

The whale activity is worth tracking even under the insider-trading caveat. User AdrianCronauer (joined March 2026) holds $1.8 million across six escalation-side positions: the May 31 peace deal NO at $446K, uranium surrender NO at $297K, May 22 peace deal NO at $296K, Hormuz normalization NO at $240K, and a small US invades Iran YES at $60K. 6 A separate trader, aekghas, dropped $800K on the May 31 NO at 82¢. 2

The longer-dated sub-markets are still pricing significant probability of an eventual deal: June 15=33%, June 30=41%, July 31=52%, December 31=69%. 2 This is the market's actual message: not "no deal ever," but "not by May 31."

Ceasefire markets are holding, for now. The Iran ceasefire through May 21 settled at 97% YES after Iran's foreign minister traveled to Pakistan for continued mediation. 7 But the Institute for the Study of War's May 20 special report documented the first extended ground clashes between Hezbollah and IDF since the April 16 ceasefire (seven hours then four hours in Bint Jbeil), and confirmed Iran is using the pause to build a toll system on the Strait of Hormuz — charging approximately $150,000 per vessel, with priority lanes for China and Russia. 8 Hormuz "lifted by June 30" has dropped from ~67% to 54% on that backdrop.

Oil: Brent crude closed May 21 at $105.83, up 0.77% on the day, after swinging from a 5.6% intraday drop (Trump "final stages" euphoria on May 20) to a high of $108.53 before settling. 5 US gasoline averages $4.55 per gallon, up 43% year-over-year.

Tradeable expressions:

Oil call spread (Brent $106–$115, Jun expiry): The deal's collapse removes the near-term ceiling scenario. If Hormuz normalization odds keep falling and Hezbollah-IDF friction escalates, Brent's path back to $110 is more plausible than the market priced 48 hours ago.
Ceasefire calendar arb: May 21 = 97%, May 22 = 91%, May 24 = 83%. The step-down is ~3pp per day. If the Pakistan talks stall over the weekend, May 22 could reprice sharply lower and the arb between adjacent dates compresses fast.

Fed: hike is back on the table

The April 29 FOMC minutes, released May 20, contained the phrase that moved markets: "A majority of participants highlighted that some policy firming would likely become appropriate if inflation were to continue to run persistently above 2 percent." 9 The vote was 8-1-3 — Miran dissented in favor of a 25bp cut, while Hammack, Kashkari, and Logan voted to hold but objected to the easing-bias language in the statement. That's the most divided the committee has been since 1992.

The effect on prediction markets was immediate. CME FedWatch shows at least one hike before December 2026 at ~46% (36.9% chance of a move to 3.75-4.00% + 9.5% chance of 4.00-4.25%), up from ~32% before the window opened — a 14-18 point swing. 10 Polymarket's "zero cuts in 2026" market sits at roughly 70%. 11 Note a data conflict: DeFi Rate's cross-platform VWAP aggregator shows the same "zero cuts" probability at 57%, down 5pp over the window. 12 The divergence most likely reflects methodology differences (single-exchange vs. VWAP blend), but both sources agree the direction is hawkish.

June's meeting is a non-event for now: Polymarket and DeFi Rate both show ~97-98% probability of no change at the June 16-17 meeting. 12 The market is not pricing a June hike — it is pricing the possibility that the new chair starts moving rates by September or December.

That new chair is Kevin Warsh, who takes the oath May 22 — tomorrow. 10 Ed Yardeni at Yardeni Research argued in a CNBC note that Warsh faces a "who's actually in the driver's seat?" problem: "Warsh is set to chair the June FOMC meeting, but who's actually in the monetary-policy driver's seat? We'd argue that it's the Bond Vigilantes." 13 Collin Martin at Charles Schwab offered a simpler framing: "We assume Warsh will try to lean dovish, but inflation above 2% will make that difficult." 10

One puzzle: the 10-year Treasury yield dropped from 4.63% to 4.56% (-7bp) on the same day the minutes printed. 14 ROIC.ai attributes this to growth concerns — the long end is pricing a slowdown risk that the front end isn't yet pricing. That divergence is itself a tradeable signal.

Tradeable expressions:

TLT puts (short long-duration Treasuries): If the next CPI print (currently 3.8% YoY) stays elevated, the "growth concern" rally in the long end has limited room. A Warsh September hike would reprice the 2-10 spread sharply. A 3-month TLT put spread captures that scenario with defined downside.
XLF (financials ETF) vs. XLU (utilities ETF) long/short: Banks benefit from a higher-for-longer curve; utilities carry the highest duration pain. The FOMC minutes shift the relative direction of these two.

Nvidia: beat again, flat again

Nvidia's Q1 FY2027 results hit every number: $81.62B revenue (+85% year-over-year, beat by 3.4%), $1.87 EPS (+140% YoY, beat by 6.3%), Data Center at $75.2B (+92% YoY), and Q2 guidance of $91B — $4.2B above the $86.8B consensus. 15 The company authorized an additional $80B buyback and raised its quarterly dividend 25× from $0.01 to $0.25 per share. 15 CEO Jensen Huang declared: "This was an extraordinary quarter, demand has gone parabolic. The reason is simple. Agentic AI has arrived." 15

The market reaction: NVDA dropped more than 3% in after-hours, then recovered to roughly flat (-0.3% to +0.9% depending on the snapshot time). 16 This is the fifth consecutive quarter where Nvidia beat estimates and the stock did not rally. 17 The prior quarter (Q4 FY2026) ended in a -4.16% next-day drop and a -10.67% 30-day drawdown.

Polymarket's pre-earnings beat probability was 94.3%, Data Center above $70B was 96.7% — both resolved YES. 15 The market was pricing a beat; the stock reaction is pricing the "what comes after." Saxo Bank captured it cleanly: Nvidia's "strong sales outlook drew a muted after-hours reaction, reminding investors that very high expectations are not easily fed." 17

Tradeable expression: The implied volatility crush post-earnings typically creates a window for short-vol strategies (short straddle entered the day after results). Five consecutive muted reactions suggest realized vol will continue to underperform implied vol heading into Q2 earnings.

Bitcoin: bouncing off the 50-day EMA

Bitcoin was trading near $78,000 on May 21, recovering from a low of approximately $76,000 earlier in the week. 18 The recovery catalysts: spot ETF outflows dropped from $648 million on May 18 (the third-largest single-day exit of 2026) to $70.5 million on May 20, with BlackRock's IBIT accounting for roughly $61.5 million of the May 20 total. 18 That's still a fourth consecutive outflow day, but the deceleration is clear.

Institutional positioning: Harvard's endowment cut its IBIT stake 43% in Q1 2026 to approximately 3.04 million shares (~$117 million) and fully exited its Ethereum ETF position (~$86 million). 19 On the other side, Abu Dhabi's Mubadala sovereign wealth fund added approximately $90 million in BTC ETF shares during the same quarter. 19

Prediction market read: Polymarket shows 56% probability that BTC falls below $75,000 by the end of May. 20 The year-end $100K contract sits at approximately 51% — essentially even odds. Technical setup: 50-day EMA at $76,762 acted as support; the next target to the upside is the 200-day EMA at ~$81,536.

Tradeable expression: The 50-day EMA held on the current test. A position that goes long BTC from current levels with a stop below $76,000 and a target at the 200-day EMA (~$81,500) offers a roughly 3.5:1 reward/risk ratio. If the ETF flow reversal continues, the $81.5K resistance becomes the tell for whether institutional demand is returning.

Brazil: Lula leads, field splinters

The Vorcaro scandal — ongoing legal proceedings involving Flávio Bolsonaro (son of former president Jair Bolsonaro) — is reshaping Brazil's October 2026 presidential race faster than polls. 21

Polymarket ($50.2 million total volume) now shows Lula at approximately 47% (+7pp over the past week) and Flávio Bolsonaro at approximately 28% (-15pp), down from a May 13 lead of 43%. 22 Kalshi confirms the same direction, showing Flávio at 29%.

Market-liberal voters appear to be rotating into Romeu Zema (NOVO party), who has surged from ~4% to 12.1% — a 3× move — as Flávio's polling erodes. 22 The fragmentation of the right-of-center vote benefits Lula in a runoff scenario: a split right field in round one generally leaves the stronger second-round candidate (Lula in this framing) in better position.

The Brazilian real recorded its largest weekly drop against the dollar since October 2025 during the same period. 23

Tradeable expression: A Lula win historically correlates with looser fiscal policy and a weaker BRL. Traders treating this prediction market as a leading indicator can express the view through USDBRL (long dollar vs. real) on further deterioration in Flávio's odds, with the Vorcaro proceeding timeline as the key event calendar to watch.

Platform watch: rules, parlays, and a congressional ban

Three regulatory events in 46 hours:

Senate ban (immediate effect): The US Senate passed a unanimous 100-0 resolution banning senators and their staff from trading on prediction markets including Polymarket and Kalshi — effective immediately. 24 The House has not yet followed, with Speaker Mike Johnson describing it as a conversation still building "consensus." 25 Senator Chuck Schumer's quote in the floor debate: "We must never allow Congress to turn into a casino where members representing the public can gamble on wars or economic crises or elections." Both Polymarket and Kalshi endorsed the ban publicly.

Polymarket files for parlays: On May 20, Polymarket self-certified a new contract type with the CFTC — "combinatorial outcome contracts" (parlays) combining two or more sports event legs, resolving to $1.00 only if every leg is satisfied. 26 Listing can begin no earlier than May 21. The SEC simultaneously opened a public comment period on prediction market ETFs. 26

CLARITY Act passes committee: The Digital Asset Market Clarity Act (H.R. 3633) advanced out of the Senate Banking Committee 15-9 on May 14, with two Democrats crossing the aisle. 27 Polymarket passage odds in 2026 jumped from 46% to 64% following the vote. The bill creates the first explicit regulatory boundary between centralized and decentralized crypto yield in US law.

Cover image from Polymarket: US x Iran permanent peace deal by...?