Prediction Bubbles
PredictionBubbles maps live Polymarket and Kalshi odds onto one board, so traders can spot price gaps between venues without checking both separately.
PredictionBubbles: Polymarket vs Kalshi Odds Bubble Board
What is Prediction Bubbles?
PredictionBubbles is a free bubble chart tool that puts Polymarket and Kalshi odds on one board, sizing markets by volume and coloring them by probability so traders can spot price gaps without opening two tabs.
Ready to try Prediction Bubbles?
Open the official site and get started in a few clicks.
Prediction Bubbles Overview
PredictionBubbles is a free board that puts Polymarket and Kalshi odds on one screen. Both sites list the same events, election results, rate decisions, sports outcomes, but at different prices. Most traders only check one venue because they are logged into one tab. PredictionBubbles pulls live prices from both books and draws every open market as a bubble, so the price gap between venues is visible without a second login.
The board works on two signals. Bubble size tracks traded volume, and bubble color tracks implied probability. A large dark circle is a heavy market the crowd still rates as unlikely. A small bright circle is a thin market the crowd treats as almost certain. Those two numbers get mixed up a lot, and the whole design exists to stop that. Prices refresh every 15 minutes, which is a screen, not an order book. You will not get tick by tick depth here.
This tool is for anyone who already trades or watches Polymarket and Kalshi and gets tired of flipping between two apps to answer one question: what does the market think, how much money backs that number, and does the other venue disagree. It also suits people scanning for relative value, the same race or crypto level priced on both platforms, and writers or builders who want a no-key HTML embed or a public JSON feed instead of scraping two sites by hand. If you only use one venue, or you need live order book depth, this board will feel too slow for you.
Past the main canvas, category pages break markets into politics, sports, and other topics, each with a movers table for the biggest 24 hour swings and a venue split. A pair list surfaces related questions where the two venues do not agree on price. A comparison page tracks open market counts and volume by venue, and a beta sure bets scanner flags midpoint gaps every 15 minutes, though it is honest that a gap is a signal to check the live book, not a locked trade.
What sets this apart from a single venue app is the side by side view itself. Nobody needs an account, a wallet connection, or a deposit to look at it. Filters stay on your device, not in a cloud profile. You come here to see where the money and the disagreement sit, then you leave to place the actual order on whichever venue listed it. I'd call it a decent screening layer for people who trade on both books, less useful if you already live comfortably inside one.
Prediction Bubbles Key features
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Cross venue bubble board
Every open Polymarket and Kalshi market shows up as one bubble on a single canvas. You skip the fifty tabs and scan politics, sports, crypto, and culture at once.
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Volume as size
Bubble size tracks traded volume, so a $65M long shot and a $2M near lock never look the same. A high probability market can't hide the fact that barely any money backs it.
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Probability as color
Color maps implied chance from 0% to 100%. You catch conviction and liquidity in one glance instead of scanning two separate columns.
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15 minute refresh
The board pulls fresh prices from both venues on a fixed clock and reloads the data without a full page refresh. It's honest about the lag: this is a screen, not a live order book.
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Filters and search
Narrow the canvas by venue, category, or text search, and reset everything with one click. Settings stay on your device, so there's no account needed to keep your view.
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Category pages and movers
Politics, sports, and other topics get their own lists with odds, 24 hour price change, volume, and venue. A movers table ranks the day's biggest probability swings.
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Per market pages
Each contract has its own page with yes and no odds, volume history, and a link to trade on the source venue. You can follow a market and get a push when the price moves five points or more.
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Venue disagreement pairs
Related questions from both venues sit side by side with the point gap between them. The tool reminds you to check the resolution rules before treating any gap as free money.
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Sure bets scanner (beta)
Every 15 minutes a sweep flags markets above $5,000 in volume where linked questions or deadlines don't agree on price. It's built as a signal to check the live book, not a confirmed trade.
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Polymarket vs Kalshi scoreboard
One page tracks open market counts, volume, and category strength for both venues, plus their fee formulas. That last part matters, since a raw price gap can vanish once fees are counted.
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No key HTML embed
Category pages offer an embed showing the top bubbles by volume, so a newsletter or site can display the board without an API key.
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Public JSON feed
The same data behind the board is available as a JSON file for anyone building their own tool. It updates on the same 15 minute schedule as the main site.
Prediction Bubbles Fees
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Board access The main board, embed, and public JSON feed are free with no account or subscription needed.
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Polymarket fee Polymarket lists a $0 maker fee and a taker fee between 0.04 and 0.07 times p(1-p), which peaks on 50/50 markets.
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Kalshi fee Kalshi charges a taker fee near 0.07 times p(1-p), plus maker fees on some contracts.
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Telegram scanner Full sure bets tickets on Telegram require a free subscribe, not a paid tier.
How to use Prediction Bubbles
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Open the board
Go to predictionbubbles.net in your browser. Nothing to sign up for and no wallet to connect.
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Read the bubbles
Bigger bubbles mean more trading volume. Color tells you the current implied probability, from dark for unlikely to bright for near certain.
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Filter by venue or topic
Narrow the board to Polymarket, Kalshi, politics, sports, or crypto with the filter controls. Clear the filters in one click when you want the full canvas back.
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Search a specific question
Type a name, ticker, or race into the search bar if you already know what you are looking for.
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Check a single market
Hover over a bubble for a quick snapshot, then click through to its market page for price history and a link to the venue that lists it.
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Check the movers table
Open the movers list to see which markets shifted the most in the last 24 hours, instead of scanning by volume alone.
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Compare the two venues
Open the Polymarket vs Kalshi page for market counts, category strength, and fee formulas side by side.
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Scan for price gaps
Open the sure bets page to see paired questions where the two venues disagree. Read both rule sets before you treat a gap as free money.
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Follow a market
Turn on Follow for a market page if you want an alert when the price moves five points or more.
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Embed or pull the feed
Paste the no key HTML embed on your own page for the top volume bubbles, or poll the public data.json file if you are feeding another tool.
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Trade on the venue
When you find a market worth acting on, leave the bubble and place your order directly on Polymarket or Kalshi.
Prediction Bubbles Screenshots
Is Prediction Bubbles safe & legit?
<p>PredictionBubbles is a free public dashboard, not an exchange, so it never touches your money. It just pulls live prices from Polymarket and Kalshi and displays them as bubbles, with no account, no wallet connect, and no deposit screen anywhere on the site.</p>
<p>There is no public team name behind it, and the X account is only a few months old with a small following, so trust mostly rests on what the tool does rather than who runs it. It shows up on the independent prediction markets wiki and got a writeup from CryptoSlate in August 2026, both describing it the same way the site describes itself: a reader layer over two real venues.</p>
<p>No known red flags. The main thing to watch is that its "sure bets" scanner can show a price gap between two markets that only look identical, so treat those as a prompt to check the rules yourself, not a guaranteed win.</p>
X account intel @predictionbubbl
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Based in Macedonia
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Joined X August 2026 1 month ago
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Username changes Never renamed
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Signup source Web
Public profile signals from X. Use as one input alongside other due-diligence.
Wallet blacklist scan checked Sep 10, 2026
- MetaMask Not flagged
- Phantom Not flagged
- ScamSniffer Not flagged
- EtherAddressLookup Not flagged
- Keplr Wallet Not flagged
Domain predictionbubbles.net checked against public crypto wallet blacklists.
Prediction Bubbles Updates
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The bubbles on CryptoSlate Predictions run on our engine. Size is volume, ring colour is the 24 hour change. 48 markets on the page today, $4.56B of volume behind them.- 1 replies
- 1 reposts
- 2 likes
- 243 views
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Claude is down 12.9 this week. ChatGPT is up 18.
Claude (@AnthropicAI) 58.0%
ChatGPT (@OpenAI) 31.7%
Gemini (@Google) 5.5%
Grok (@xai) 4.7%
Kimi, Qwen and Ernie under 1.5%
$10.3M on @Kalshi, on who has the best AI at the end of 2026.
https://predictionbubbles.net
- 95 views
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Our board is mostly uncertainty. This is the other end.
More tech layoffs than in 2025: 94.8%
Xi visits the US before 2027: 94.8%
Spider-Man tops the 2026 box office: 93.5%
$32.9M says these are settled. Which would you fade?
https://predictionbubbles.net
#SpiderManBrandNewDay
- 56 views
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PredictionBubbles: Polymarket vs Kalshi Odds Bubble Board
🆕 Prediction Bubbles added to polymartapp
@predictionbubbl
PredictionBubbles is a free bubble chart tool that puts Polymarket and Kalshi odds on one board, sizing markets by volume and coloring them by probability so traders can spot price gaps without opening two tabs.
https://polymart.app/prediction-bubbles
#PredictionBubbles #Polymarket #Analytics- 3 replies
- 1 reposts
- 2 likes
- 255 views
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The September Fed decision is a coin flip on our board, 11 days out.
Hike 25 bps: 50.5%
No change: 48.5%
Cut 25 bps: 0.4%
@Polymarket and @Kalshi word it differently and land within two points.
The cut has taken $29.3M over the market's life.
https://predictionbubbles.net
#FOMC
- 31 views
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Bitcoin moved today and the whole ladder repriced with it. Every rung up.
$85,000 by year end: 80%, up 18.5
$90,000: 59.5%, up 16
$95,000: 43.5%, up 15.5
$100,000: 30.5%, up 9
Three weeks ago $100k was at 8.5%.
https://predictionbubbles.net
#Bitcoin $BTC
- 1 likes
- 90 views
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🆕 New project added to the prediction markets wiki
Prediction Bubbles
@predictionbubbl maps active Polymarket and Kalshi markets into a live bubble chart 🫧📊
Quickly spot which markets are busiest, moving fastest, or priced differently across venues.
- 2 replies
- 1 reposts
- 11 likes
- 316 views
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$65M is riding on whether Jesus Christ returns before 2027.
The market says 1.9%.
That is more money than any Senate race on our board.
https://predictionbubbles.net
#PredictionMarkets #Polymarket
- 1 replies
- 2 likes
- 52 views
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Yesterday these two were almost level in the same Senate primary.
Darline Graham went from 41% to 73%.
Ralph Norman fell from 35% to 28%.
$4.7M is on the pair of them.
http://predictionbubbles.net/?q=carolina
#PredictionMarkets #Kalshi #SouthCarolina
- 39 views
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🇺🇸🇮🇷 Trump said the US is "only semi-negotiating" with Iran.
The market didn't stop believing. It moved the date.
Near dates collapsed. December barely moved.
http://predictionbubbles.net/?q=blockade
#PredictionMarkets #Polymarket
- 45 views
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Polymarket and Kalshi on one board.
Size is volume, color is probability. No sign-up, nothing to install. Open it and see what the market is doing in about three seconds.
http://predictionbubbles.net
1 more in this thread
The same daily moves go out on Telegram, if you'd rather have them
pushed to you than scroll for them.
http://t.me/predictionbubbles- 3 replies
- 2 likes
- 147 views
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Open the official site and get started in a few clicks.
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