Event contract trading journal for prediction market traders
Every market you trade becomes one trade, Yes or No, measured on what you staked. See whether your prices are right, which categories pay you, and whether holding to settlement beats getting out early.
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Calibration and Brier score
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Return by entry price
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Return by market and category
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Yes and No side stats
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Maker and taker entries
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Settled and early exits
A win rate and a P&L total say little about event contracts. A 90¢ favorite and a 10¢ long shot count the same in both, and neither number tells you whether you paid a fair price. TradesViz gives event contracts their own asset type, with stats built around price, probability and stake.
Find out if your prices are right
Calibration groups your settled positions by the price you paid and puts your actual win rate next to it. A fair price wins as often as it costs, so positions bought near 40¢ should win about 40% of the time. Bars above the line beat the price. Bars below it paid too much.
The Brier score sums that up in one number across your settled positions. 0 is perfect, and always entering at 50¢ would score 0.25.
See which entry prices pay you
Return by entry price shows your net return in each 10¢ band, after fees and on the side you held. Early exits count too, because they paid that price. If long shots are eating what your favorites earn, this chart shows it.
Click any bar to open the trades behind it in Chart Explore.
Know which markets are worth your time
Return by market shows your net return on each of your 20 largest market series, so a losing habit cannot hide behind one big win. The Category table rolls your closed positions up into areas such as Sports, Crypto and Economics.
Compare how you enter and how you exit
The Side table puts your Yes and No positions next to each other. Entry Order splits maker entries from taker entries, so you can see what taking the price on the book costs you. How It Closed separates positions that settled from positions you sold before the result.
Positions you still hold sit in their own table, with unrealized P&L at the last traded price.
Every market reads like a trade
Each market is one trade in your journal, shown as YES or NO, however many fills it took to build. Symbols are laid out like an option symbol, with the series, date and outcome spelled out, so you can search, sort and filter them like the rest of your trades.
Your fills on the market's own price chart
Open any trade to see the market's question and its price history, with your entries and exits marked on it. The header shows your entry as a price and as odds, and compares it with the closing price, the market's last price before the event began, so you can tell whether you beat it.
One model for every event contract
An event contract is a claim on one outcome, priced from 0 to 1. TradesViz stores every contract the same way, whichever venue lists it, so your stats mean the same thing across all of them.
Yes and No are one market
Yes is the outcome the market asks about and No is the other side. Buying No at 85¢ is the same position as selling Yes at 15¢, so both land on one ledger and net correctly.
Returns are measured on your stake
Your stake is what you paid for the side you held, which is also the most you can lose. 100 No contracts at 85¢ is an $85 stake, not a $100 one.
Settlement closes the trade
When a market resolves, the trade closes at its payout of $1, $0 or a scalar amount. Sell your whole position before that and it counts as an early exit.
Any number of outcomes
A market with three or more outcomes is one contract per outcome. Each contract you trade is its own trade, with its own stake and result.
Bring in your event contract history
Your fills and settlements go straight into your trading journal, and importing the same file twice never doubles a trade.
Auto-sync
Connect your platform once, and new fills and settlements arrive on their own.
File import
Upload your platform's activity export to bring in your full history in one go, including fees and settlements.
Custom template
Trading somewhere we do not list yet? The Custom template takes event contract fills from any venue, and every stat on the Prediction Markets tab works from them.
Part of a full trading journal
Event contracts sit in the same journal as your stocks, options, futures, forex and crypto. Filter to one asset type or review everything together, with your tags, notes, PnL calendar, custom dashboards and 600+ stats on every trade.
Event Contract Trading Journal FAQ
What is an event contract?
An event contract is a claim on one outcome. It pays a fixed amount if the outcome happens, usually $1 per contract, and nothing if it does not. Its price runs from 0 to 1, so a contract at 62¢ means the market puts that outcome at about 62%.
What is the best trading journal for event contracts?
TradesViz is the most comprehensive trading journal for event contracts and prediction markets. Alongside 600+ stats, tags, notes and a PnL calendar, it tracks calibration, Brier score, return by entry price, return by market and category, Yes and No sides, maker and taker entries, and settled versus early exits.
How do I get my prediction market trades into TradesViz?
Connect your platform for auto-sync, upload its activity file, or use the Custom template. The full list of platforms is on the supported brokers page.
My platform is not listed. Can I still track my event contracts?
Yes. Use the Custom template with event_contract as the asset type, one symbol per market and the Yes price from 0 to 1. A buy holds Yes, a sell holds No, and a settled market closes at 1 or 0. Every stat on the Prediction Markets tab works from those fills. Market titles, categories, price charts and live prices come from the platforms we connect to directly.
How does TradesViz measure return on an event contract?
Return on stake is net P&L divided by what you paid for the side you held. Buying 100 Yes at 40¢ is a $40 stake, so a win pays $60 before fees, a 150% return. A total loss is -100% before fees.
What is a Brier score in prediction market trading?
The Brier score measures how well your entry prices predicted results. For each settled position it squares the gap between the price you paid and the result, then averages them. Lower is better: 0 is perfect, and always entering at 50¢ scores 0.25.
How are Yes and No positions tracked?
Each market is one trade, shown as YES or NO for the side you held. Prices are kept in Yes terms, so buying No at 85¢ is the same position as selling Yes at 15¢. Your stake and return are still measured on the side you held.
What happens when a market settles?
The settlement closes the trade at its payout: $1, $0 or a scalar amount. A position you sold in full before the result counts as exited early. A position you partly sold and then held to the result counts as settled.
Can I track markets with more than two outcomes?
Yes. A market with three or more outcomes is one contract per outcome, and each contract you trade is its own trade in your journal.
Can I see event contracts next to my other trades?
Yes. Event contracts sit in the same journal as your stocks, options, futures, forex and crypto. Filter to one asset type or review everything together.
What can I do with the TradesViz REST API?
Use Python, scripts or your own applications to read and search your TradesViz accounts, trades and executions, build custom reports, and manage notes and tags. With the required permissions, you can import supported executions, edit journal entries, update trade risk settings, split or merge trades, and delete selected journal data. Execution imports currently support eligible USD US stocks and fixed-multiplier USD futures, not every asset supported by the website.
Can I connect ChatGPT or Claude to my TradesViz journal using MCP?
Yes. Connect a compatible ChatGPT, Claude or other MCP client to the hosted TradesViz MCP server using browser sign-in; no local MCP server or REST API key is needed. Ask your assistant to summarize recent trades, compare results from retrieved trades, find trades by symbol or tag, or save a review note. Editing and other journal changes require the matching permissions. Connector availability depends on your AI client and workspace settings.
How do API and MCP permissions protect my trading journal?
You select the trading accounts and permissions each API key or MCP connection can use. Start with read access and grant editing or deletion separately when needed. Day notes, day tags and general journal notes require a separate opt-in. You can revoke access from the API/MCP dashboard. These tools manage your journal; they cannot place, change or cancel broker orders. AI responses can contain mistakes, so review proposed changes before approving them.
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