Polymarket's Aug. 3 board: September hike odds jump as Gaza volatility collides with Hormuz risk (2026)

Polymarket's cleanest macro signal this week was in rates: the implied probability of a 25-basis-point Fed hike after the September meeting rose from an inferred 50.5% to 56.5%. The geopolitical board was less decisive. The market priced a little less risk of a U.S. invasion of Iran, but it also cut the chance of Strait of Hormuz traffic returning to normal by Aug. 31. Gaza disarmament odds surged, yet the implementation sequence remained unresolved.

That split matters for trading. The board is not saying that geopolitical risk is gone; it is saying that diplomatic headlines are arriving faster than physical normalization. The actionable signal is therefore conditional: rates have a clearer repricing, while oil and conflict trades still need confirmation from vessels, policy steps, and implementation—not just headlines.

Window and cutoff: July 27, 2026 at 09:00 through Aug. 3, 2026 at 09:00 ET. Polymarket values below are a Gamma snapshot taken shortly after the scheduled cutoff. The displayed 7-day changes are the platform's rolling fields, so prices may move after publication. Implied probabilities are the Yes prices before fees and spread.

The board at a glance

Market	Yes now	7-day move	1-week volume	OI	Liquidity / spread
Fed +25 bps after September	56.5%	+6.0 pp	$1.61M	$3.62M*	$514K / 1 pp
No change after September	42.5%	-1.0 pp	$2.49M	$3.62M*	$414K / 1 pp
U.S. invade Iran before 2027	20.5%	-1.0 pp	$6.81M	$7.96M	$1.17M / 1 pp
Hormuz traffic normal by Aug. 31	12.5%	-1.0 pp	$2.71M	$3.45M	$607K / 1 pp
Hamas agrees to disarm by Dec. 31	55.5%	+40.5 pp	$1.04M	$303K	$70K / 1 pp
CLARITY Act signed in 2026	25.5%	-12.0 pp	$1.00M	$1.43M*	$57K / 1 pp
Adanech Abiebie next Ethiopia PM	0.2%	-0.1 pp	$10.84M	$34.5K*	$19.5K / 0.2 pp

* OI is the linked parent-event figure, not an explicit child-market field. Weekly volume is kept at the child-market level. Polymarket did not expose authenticated Yes-versus-No net flow or a reliable large-trade list for these records; liquidity and spread are the available execution clues.

1. Rates: the most legible signal is a hawkish September tail

The two largest September outcomes moved in opposite directions. The 25-bp hike contract went from an inferred 50.5% to 56.5% (50.5 + 6.0), while the no-change contract went from 43.5% to 42.5%. These are separate contracts; the small residual is distributed across cut and larger-move outcomes.

The catalyst is confirmed. On July 29, the Federal Reserve held the target range at 3.50%–3.75% in a 9–3 vote. Beth Hammack, Neel Kashkari, and Lorie Logan dissented because they preferred a 25-bp hike. The same statement said inflation remained elevated and cited energy-related supply shocks, while describing Middle East uncertainty as part of the backdrop.

That is the bullish case for a hike: three dissenters have already put a number on the table, and an energy shock can keep inflation expectations uncomfortable even if growth holds up. Reuters' post-meeting coverage also described September as a possible hike point as oil and war-related inflation risks persist.

The No case is not weak. The Fed just chose patience, and several economists cited by Reuters argued that supply-side inflation is not easily fixed with higher rates. The labor market has not broken, but neither has the data forced an immediate follow-through. The next scheduled test is the Sept. 15–16 FOMC meeting, which will also include a Summary of Economic Projections.

Trade idea — inference, not a recommendation: If the hike contract stays above 55% after the next inflation and employment releases, treat long-duration growth and long-maturity bonds as the vulnerable leg. A retail-sized, defined-risk expression could be a small put spread on a long-duration growth or Treasury ETF rather than an uncapped short. The thesis is invalidated by a renewed slide in inflation, a sharp labor-market deterioration, or a move back below roughly 50% for the hike contract. If that happens, the signal shifts back toward duration relief.

2. Iran and Hormuz: diplomacy improved the headline, not the physical tape

Two contracts describe a market that is less afraid of an immediate U.S. invasion but still far from normal shipping. The U.S.-invade-Iran contract slipped from an inferred 21.5% to 20.5%. The Hormuz-normal-by-Aug. 31 contract fell from 13.5% to 12.5%.

The catalyst was a mix of confirmed proposals and unconfirmed implementation. Reuters reported on July 28 that Oman had put forward a Gulf-backed plan under which Iran could collect voluntary fees and share management of the strait with Oman; a U.S. official rejected tolls or fees and said the waterway should remain free of Iranian control. On Aug. 1, Reuters reported that Trump said he would hold off on a fresh attack if a deal could reopen the strait, while Iranian officials described the talks more narrowly as a possible new route rather than an agreement to reopen the waterway.

The physical check is still poor. Reuters counted four commodity vessels transiting Hormuz on July 31, all exiting, versus three on Thursday, and warned that vessels with transponders off were not included in the count. That is a long way from the Polymarket resolution condition, which requires the IMF PortWatch seven-day moving average of transit calls to reach at least 60 by Aug. 31.

The Yes case is straightforward: Oman provides a channel, the U.S. has signaled that a quick deal could pause further attacks, and a negotiated transit mechanism could reopen enough traffic to change the oil-risk premium. The No case has more immediate evidence: the fee dispute is unresolved, Iran's public position is not the same as Washington's, and the vessel tape remains thin. Reuters' Aug. 3 oil analysis framed the key variable as actual passage through Hormuz and Bab el-Mandeb, not the latest OPEC quota headline.

Trade idea — inference, not a recommendation: Do not trade the 12.5% normality price as if it were a direct oil forecast. Use a two-stage trigger. If PortWatch and vessel counts both improve, consider fading part of the emergency energy premium or reducing an energy hedge. If traffic stays thin or attacks broaden, a small, defined-risk long-energy or oil-volatility position is the cleaner expression than a naked bet on invasion. The invalidation is verified, sustained reopening—not another diplomatic statement.

3. Gaza: the biggest probability move came with the biggest resolution caveat

The Hamas-disarmament contract rose 40.5 percentage points, from an inferred 15.0% to 55.5%. It was the week's largest clean volatility print among the selected markets, but it is also marked disputed under UMA. That status matters: the price is a signal about expectations, not a settled fact about implementation.

The confirmed catalyst was a July 31 statement from Trump that Israel was happy with an agreement for the complete disarmament of Hamas and other armed groups, with phased Israeli withdrawals and an international stabilization force. The Reuters account also quoted Trump warning that the plan could have “ups and downs.”

The Yes case is the newly articulated sequence: an announced framework, Israeli participation, phased withdrawal, and a security force that could make the commitment operational. The No case is the implementation gap. Reuters reported the next day that strikes continued and that the roadmap had not begun. Hamas said weapons would be handed over for storage only after Israel halted operations and withdrew; an Israeli official said there would be no withdrawal without “genuine disarmament.” Reuters' follow-up also recorded opposition from Itamar Ben-Gvir.

Trade idea — inference, not a recommendation: Treat this as a confirmation trade, not a headline trade. If verified disarmament and a real withdrawal sequence begin, the first-order expression is a partial fade of conflict-sensitive energy and defense premia, with travel and transport as a higher-beta risk-on watchlist. If the sequencing dispute persists, keep the geopolitical hedge rather than chasing the 55.5% Yes price. The market's UMA dispute is an additional reason to size this smaller than the Fed signal.

4. Crypto policy: the CLARITY Act repriced procedural risk

The CLARITY Act contract fell from an inferred 37.5% to 25.5%, a 12-point weekly drop, even though the policy process produced substantial text. The contract resolves Yes only if H.R. 3633 passes both chambers and is signed by Dec. 31, 2026.

The July 27 Paul Hastings policy tracker reported that Senate Republicans had released updated 616-page text, that seven Democratic negotiators had raised concerns, and that Senate Majority Leader John Thune had cast doubt on passage before the August recess. The tracker also noted that the first week of August remained a possible window for Senate action. This is confirmed policy reporting; passage is not.

The Yes case is that a consolidated text exists, some industry and political support remains, and a floor window could reopen the path. The No case is procedural: a long bill still needs bipartisan agreement, committee and floor movement, and presidential signature. The market's decline says traders are discounting the path, not rejecting the policy's eventual value.

Trade idea — inference, not a recommendation: Treat crypto-policy beta as an event option. A genuine floor schedule or committee advance would be the trigger to revisit ETH, U.S. exchange, and digital-asset infrastructure exposure. A further delay through the stated early-August window is a reason not to front-run the story; if taking exposure, keep it small and avoid assuming that a headline on text equals passage.

5. The Ethiopia market is a liquidity warning, not a macro signal

The Adanech Abiebie market generated $10.84M of one-week volume—more than any other selected market—but showed only 0.2% Yes, about $19.5K of liquidity, and roughly $34.5K of related-event open interest. Its nominal market end date was June 1, while its resolution wording extends the tail to the end of 2028 if no qualifying prime minister takes office. It remained active and accepting orders in the snapshot.

No confirmed news catalyst for that burst of volume was found in this research pass. The volume-to-related-event-OI mismatch is roughly 300 to 1, and the market is restricted with a very shallow book. Those are reasons to question whether the tape represents informed macro positioning, a resolution/rollover artifact, or activity concentrated around a market with unusual lifecycle mechanics.

Bottom line: High volume is not enough. When a contract has a tiny probability, thin liquidity, a disputed or unusual resolution path, or stale-looking dates, it belongs in the “investigate first” bucket—not in a trade basket.

What to watch before next Monday

Rates: Does the September hike price hold above 55% through the next inflation and labor data? The Sept. 15–16 meeting is the cleanest scheduled catalyst.
Hormuz: Do PortWatch's seven-day transit calls and independently observed vessel counts move together toward normal? Until they do, diplomacy is not physical reopening.
Gaza: Does the announced disarmament framework produce the first verifiable implementation step—halted operations, withdrawal, storage/disarmament, or a security-force deployment—in the required sequence?
CLARITY Act: Look for procedural movement, not another round of text or supportive commentary.
Market quality: Read weekly volume alongside OI, liquidity, spread, and resolution status. The Ethiopia contract shows why a leaderboard without market structure can mislead.

The week's hierarchy is therefore simple: Fed repricing is the clearest cross-asset signal; Hormuz is the more consequential risk but still needs physical confirmation; Gaza is the most volatile headline market but not yet the cleanest trade; and raw volume alone is not evidence.

Trade ideas above are conditional inferences from prediction-market signals, not individualized investment advice. Prediction-market prices can move on thin liquidity, and some contracts may have resolution or dispute risk.

Sources and method

Polymarket Gamma market records — displayed Yes prices, rolling one-week changes, child-market volume, liquidity, and spread; values captured shortly after the Aug. 3 cutoff.
Federal Reserve July 29 FOMC statement and 2026 FOMC calendar.
Reuters: Fed decision and September rate-hike debate.
Reuters: Oman-backed Hormuz management proposal, Hormuz vessel counts, and Aug. 3 oil-supply scenarios.
Reuters: Trump statement on Gaza disarmament and implementation follow-up.
Paul Hastings Crypto Policy Tracker for the July 27 CLARITY Act procedural update.