Polymarket's July 27 board: Fed hold odds slide as Iran pause resets risk (2026)

The signal

Data cutoff: July 27, 2026, 9:00 a.m. (UTC-05:00). Polymarket prices below are implied probabilities for the Yes outcome. The starting figures are arithmetic checks: current probability minus the displayed seven-day change. Weekly volume is the rolling seven-day total in the market record.

The board has moved from last week's clean CPI-to-Fed repricing into a live event window. The July FOMC event traded $24.4 million across its child contracts during the week, with $19.95 million in event-level open interest. The hold contract still leads at 76.25%, but it fell from 93.15%; the 25-basis-point hike contract rose from 6.45% to 23.05%. 1 2

The second shift is geopolitical. The probability of a 14-day US-Iran effective ceasefire by July 31 rose from 21.0% to 54.5% after the weekend pause in strikes. Yet the separate market for normal Hormuz traffic by July 31 fell from 1.75% to 0.45%. That gap is the week's most useful signal: diplomacy improved faster than physical shipping.

The market records expose weekly volume, liquidity, spreads, and event-level open interest in some parent events. They do not provide a clean Yes-versus-No net-flow breakdown or an authenticated list of large trades in this snapshot, so the arguments below are market interpretation, not claims about directional order flow.

Snapshot

Market	Current Yes	7-day move	Weekly volume	Open interest	Resolution
Fed: no change after July meeting 1	76.25%	-16.90pp, from 93.15%	$7.86M child; $24.41M event	$19.95M event	July 29
Fed: 25bp hike after July meeting 2	23.05%	+16.60pp, from 6.45%	$3.80M child	$19.95M event	July 29
US-Iran effective ceasefire by July 31 3	54.50%	+33.50pp, from 21.00%	$822.8K child; $2.74M event	$888.4K event	July 31
Hormuz traffic normal by July 31 4	0.45%	-1.30pp, from 1.75%	$2.56M	$3.78M event	July 31
Bitcoin reaches $67,500 in July 5	37.50%	-3.00pp, from 40.50%	$793.0K child; $5.84M event	$5.41M event	August 1
Bitcoin reaches $70,000 in July 6	6.15%	-9.35pp, from 15.50%	$710.1K child	$5.41M event	August 1
Trump meets Netanyahu by July 31 7	98.75%	+38.25pp, from 60.50%	$604.2K child	Child figure not exposed	July 31

Open interest is shown at the parent-event level when the child market does not expose it. The Trump-Netanyahu record is an exception: its related parent record has a different July 24 deadline, so I have not substituted that figure for the July 31 contract.

Rates: the hold is still the base case, but the tail moved

The July Fed market is the week's main liquidity and information center. Its hold probability fell 16.9 points, while the 25bp hike probability rose 16.6 points. The two movements are almost mirror images, which makes this a timing repricing rather than a broad move into cuts. The year-end hike market moved the other way from last week's soft-CPI reading: the probability of at least one hike by December rose from 53.5% to 67.5% on $492.2K of weekly volume, with $1.24M in open interest. 8

The confirmed catalyst is the July 28-29 meeting itself. Reuters reported on July 23 that the Fed was expected to hold the 3.50%-3.75% target range, but that renewed oil prices, possible tariff shocks, and a more hawkish group of officials were making consensus harder for Chair Kevin Warsh. 9

The hike case is therefore concrete: oil and tariffs can keep inflation broad, and officials such as Christopher Waller and Beth Hammack have argued that waiting for inflation to reaccelerate would be a mistake. The hold case is also intact: the market still assigns more than three chances in four to no move, and Warsh has not provided forward guidance that commits the committee to a July hike.

Trade idea: A small, defined-risk long-duration position can express the hold signal, but it should be paired with an energy hedge. The year-end contract at 67.5% says a July hold is not a clean all-clear for bonds. The most important confirmation is the post-meeting statement and the reaction in the September and December curve, not the July binary alone.

Iran: ceasefire odds improved faster than shipping

The US-Iran effective-ceasefire market rose 33.5 points to 54.5%. Its resolution rule is narrower than a headline truce: the United States must go 14 continuous days without a qualifying air strike or surface-to-surface missile strike that directly impacts Iran before the July 31 deadline. 3

The confirmed catalyst was the weekend pause in strikes. Reuters reported on July 27 that the United States and Iran had paused attacks after two weeks of fighting, which raised hopes for diplomacy. The same report said there was no signed framework, verification mechanism, or agreed timeline, and that fewer than 10 commodity vessels per day passed through Hormuz over the weekend. Reuters estimated flows at roughly 15% of pre-war levels. 10

The Yes argument is that the pause creates enough time for diplomacy to run out the market's 14-day clock. The No argument is that a political pause has not yet produced a signed or verifiable mechanism, while Houthi attacks and weak shipping flows keep the conflict economically active.

Trade idea: The ceasefire move supports a limited bearish oil expression only if traffic data confirms it. Until then, a small energy-sector or crude-call hedge is the cleaner position for a retail portfolio exposed to long-duration bonds or high-beta crypto. Do not treat a pause in strikes as equivalent to restored supply.

Hormuz: the physical test remains almost impossible

The normal-traffic contract fell to 0.45% after trading $2.56 million during the week. It resolves Yes only if IMF PortWatch publishes a seven-day moving average of at least 60 transit calls on a qualifying date by July 31. The event has $3.78 million in open interest. 4

The Yes case is a verified de-escalation that brings insurers and ship operators back quickly. The No case has the better physical evidence today: Reuters reported fewer than 10 commodity vessels per day over the weekend, far below the traffic required by the resolution rule. This is why the ceasefire market can rise while the Hormuz-normalization market falls.

Trade idea: Keep the oil hedge on until PortWatch, not a diplomatic statement, shows sustained recovery. A defined-risk Brent or WTI call spread is easier to size than an unhedged energy bet, especially with the FOMC meeting arriving at the same time.

Bitcoin: ETF flows repaired, then reversed

Bitcoin's July ladder is less bullish than its headline event volume suggests. The $67,500 market slipped from 40.5% to 37.5%, while the $70,000 market fell from 15.5% to 6.15%. Together, those contracts say traders still see a plausible recovery into the upper-$60,000s, but a much lower chance of a clean move through $70,000 before July ends. The parent July price event traded $5.84 million over the week and carried $5.41 million in open interest. 5 6

ETF flows explain the loss of momentum. Farside recorded net inflows of $226.8 million on July 20, $203.2 million on July 21, and $69.1 million on July 22, followed by outflows of $225.1 million on July 23 and $240.1 million on July 24. Those five completed sessions sum to a modest $33.9 million inflow. The page showed $0.0 million for July 27, but that session was not a completed daily flow at the time of the read. 11

The Yes case is that the first three sessions showed real institutional demand and that softer near-term Fed odds can support a rebound. The No case is stronger at the $70,000 threshold: two heavy outflow days erased most of the week's early inflow, while the Iran pause has not produced a durable risk-on signal in oil or rates.

Trade idea: Treat BTC as a confirmation trade. A small spot allocation or defined-risk call spread is defensible only while ETF flows stay positive on a rolling basis and the July Fed hold remains the dominant near-term outcome. If flows turn negative again, the $70,000 contract is warning that upside convexity is expensive relative to the probability on the board.

Trump-Netanyahu: the largest percentage move, with no confirmed schedule

The July 31 meeting market rose from 60.5% to 98.75%, the largest percentage move among the selected macro contracts. Its $604.2K weekly volume is much smaller than the Fed, Hormuz, or Bitcoin event pools, and the child record does not expose open interest. 7

The market's resolution rule requires an in-person encounter. Its background record notes a July 3 phone call and discussion of a future meeting, but also says a U.S. official reported on July 14 that no meeting had been formally scheduled. No independently confirmed scheduling announcement was retrieved in this week's research pass. That makes the 38.25-point move a deadline and positioning signal, not a confirmed event catalyst.

The Yes case is that both leaders had already agreed to convene and that Iran policy gives the meeting a clear reason to happen. The No case is simple: no formal schedule means the market is pricing the deadline more aggressively than the evidence warrants.

Trade idea: Do not use this contract as a standalone signal for Israeli assets, oil, or the dollar. Wait for a formal itinerary or a credible travel confirmation before translating it into a cross-asset position. Until then, it belongs on the watchlist beside the ceasefire and Hormuz markets.

The trade map for next week

Rates: The July hold remains favored, but the 25bp hike probability and the 67.5% year-end hike probability keep the curve two-sided. Use duration exposure with an energy hedge.
Oil: The ceasefire repricing is real, but physical shipping has not caught up. Keep protection until PortWatch traffic improves.
Bitcoin: ETF flows produced a small net inflow over the five completed sessions, but the $70,000 July probability fell to 6.15%. Require flow confirmation before adding upside risk.
Geopolitics: The Trump-Netanyahu contract moved sharply without a confirmed schedule. Treat it as a timing signal, not a trade trigger.

The board is no longer giving one clean macro direction. It is pricing a July Fed hold, a nontrivial later-year hike risk, a possible US-Iran pause, and continued physical stress at the oil chokepoint. The useful trade is the one that survives those signals disagreeing.

This is market commentary, not personalized investment advice.

Polymarket's July 27 board: Fed hold odds slide as Iran pause resets risk