By Kalshi View Editorial Team · Updated 2026-07-17

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Kalshi GDP Markets: BEA Rules, 8:29 Cutoff & Price Math

What the reviewed KXGDP event measured

Each qualifier matters. Real GDP is adjusted for price changes; nominal GDP is not. A seasonally adjusted annual rate is not the same as the raw quarter-to-quarter percentage change. The Advance Estimate is the first current-quarter vintage, not the later second or third estimate.

Advance, second, and third estimates are different vintages

BEA reports that, from 1996 through 2024, the average absolute revision was 0.5 percentage point from advance to second and 0.6 point from advance to third. Revision risk is real, but a later vintage must not be substituted for the one named by the contract.

Strictly above means equality is No

This is why extra decimal places from a model do not control. A 2.04% nowcast or private estimate is not the settlement value. The reviewed rule pointed to BEA's published one-decimal number.

These thresholds are not exclusive brackets

The reviewed Q2 event offered thresholds such as above 1.0%, above 1.5%, and above 2.0%. They overlap. If the official result is 2.4%, all three conditions are true. The API marked the event as not mutually exclusive.

For a consistent probability model, cumulative thresholds can still reveal interval probabilities. If the model assigns 68% to GDP above 1.5% and 44% to GDP above 2.0%, then:

Subtract probabilities from the same model and timestamp. Subtracting two executable asks or two stale last trades mixes spread and liquidity with the interval estimate.

The 8:29, 8:30, and 10:00 sequence

1. Before 8:29 AM ET: verify the exact quarter, Advance Estimate wording, threshold, side, full depth, fees, and market status.
2. 8:29 AM ET: the reviewed Q2 event listed its trading close.
3. 8:30 AM ET: BEA scheduled the Q2 2026 Advance Estimate on July 30.
4. After release: use the official one-decimal BEA result, not a headline, model, or revised vintage.
5. Expiration: monitor the event status through the specified first 10:00 AM following release or fallback deadline.

The contract did not promise settlement exactly at 8:30. Close time, release time, expiration, determination, and payout are separate stages.

Calculate the full-order break-even

Suppose a hypothetical 100-contract YES order crosses two ask levels:

If an independent estimate gives the exact threshold a 53% probability:

The 45-cent top ask is not the full-order price. Applicable fees raise the break-even above 47.4%. A winning purchased position has a $100 gross settlement value; a losing position risks the $47.40 purchase cost plus applicable fees. Use the slippage calculator and payout calculator with current inputs.

Use GDPNow as an input, not a settlement source

The Atlanta Fed describes GDPNow as a running model estimate of real GDP growth for the current measured quarter. It is not an official forecast of the Atlanta Fed, the Federal Reserve System, or the FOMC, and it has no judgmental adjustment. The model page says substantial error can remain just before the BEA release.

Match the quarter and vintage before comparing GDPNow with a Kalshi threshold. A Q3 nowcast does not estimate the Q2 contract, and a model value with extra precision does not override BEA's one-decimal Advance Estimate.

Pre-trade checklist

1. Open the live KXGDP event and save the rule text and timestamps.
2. Confirm real GDP, seasonally adjusted annualized growth, and the named quarter.
3. Confirm that the Advance Estimate, not a later revision, determines the result.
4. Translate “more than” literally and place equality on the No side.
5. Read the complete order book and calculate VWAP for the entire quantity.
6. Add the current fee schedule and size for a full loss.
7. Use the current BEA schedule; do not infer a release date from a typical pattern.
8. Keep GDPNow and private forecasts separate from the official settlement source.

Frequently Asked Questions

What GDP measure did the reviewed Kalshi KXGDP market use?

The KXGDP Q2 2026 rules snapshot reviewed July 17, 2026 used BEA's one-decimal, seasonally adjusted and annualized Advance Estimate of real GDP growth for the named quarter. It did not use nominal GDP, year-over-year growth, or a later GDP revision.

Does exactly 2.0% resolve Yes for a GDP-above-2.0% market?

No when the rule says more than 2.0. The reviewed KXGDP contracts used a strict greater-than condition, so an official one-decimal value of exactly 2.0% is on the No side. The live rule text controls.

What time did the reviewed Kalshi GDP market close?

The reviewed Q2 2026 KXGDP event listed an 8:29 AM ET close on July 30, while BEA scheduled the Advance Estimate for 8:30 AM ET. Future event timestamps can differ, so verify the live event.

Can the BEA second estimate change the reviewed Kalshi GDP result?

The reviewed rules named BEA's Advance Estimate and its one-decimal published value. BEA later publishes second and third estimates, but those are different vintages. Do not substitute a later revision unless the live contract explicitly says to do so.

Are current Kalshi GDP threshold contracts mutually exclusive brackets?

No. The reviewed KXGDP event used overlapping greater-than thresholds. A sufficiently high outcome can make several Yes contracts win. A probability interval can be estimated by subtracting consistent cumulative probabilities, but the listed contracts are not exclusive brackets.

How should I use Atlanta Fed GDPNow with Kalshi GDP markets?

Use GDPNow as one model input for the matching quarter and Advance Estimate. The Atlanta Fed says GDPNow is a model projection, not an official forecast, and its final nowcast can still have material error. It does not replace the Kalshi rules or BEA result.