The 2026 FIFA World Cup has pushed prediction market volume past $2 billion, mostly on Polymarket and Kalshi. If you're coming from traditional sportsbooks, the language feels foreign: event contracts, CLOB, resolution source, implied probability, overround, and more. Misunderstanding any term can cost you real money.
Here’s a concise, practical glossary grouped by category with live World Cup 2026 examples (as of early June 2026). Use Ctrl+F to navigate.
Market Structure Terms
Event Contract
A binary instrument that pays $1 if the event happens, $0 otherwise.
Example: Spain winner contract at $0.169 → pay 16.9¢ now. Spain wins → $1 payout. No win → $0.
Binary Outcome
Yes/No market. Most World Cup contracts (tournament winner, group winner, match result) are binary even when they feel multi-outcome.
Outcome Share (Polymarket)
The tradable unit on Polymarket — same economics as an event contract, settled in USDC.
CLOB (Central Limit Order Book)
The order-matching engine used by Polymarket and Kalshi. Prices form from real buyer/seller orders (bid/ask), not a bookmaker.
AMM (Automated Market Maker)
Older model (used early by Polymarket) where a liquidity pool and formula set prices. Causes more slippage on large orders.
Resolution Source
The official data feed that decides settlement (usually FIFA for major outcomes). Always check it.
Resolution Rules
Full rules covering edge cases (disqualifications, cancellations, format changes). Read them before big positions.
Pricing & Probability Terms
Implied Probability
Directly equals the contract price. $0.165 = 16.5% chance.
True Probability
Your own estimate of the real likelihood. Edge exists when your true prob differs from implied prob.
Overround (Vig)
Sum of all implied probabilities in a market minus 100%.
Sportsbooks: often 120%+. Polymarket World Cup winner: usually close to 100–105%.
Spread (Bid-Ask)
Difference between highest bid and lowest ask. Tight on favorites (e.g. France 0.2¢), wide on longshots.
Slippage
Actual fill price worse than expected due to thin books or large size.
Depth
Volume available at each price level in the order book. Critical for sizing six-figure trades.
Trading Terms
Long
Buying Yes shares (or the contract) expecting the event or price to rise.
Short
Buying No shares or selling Yes (expecting the event fails or price drops).
Limit Order
Buy/sell only at your specified price or better.
Market Order
Execute immediately at best available price (guarantees fill, risks slippage).
Costs & Fees
Trading Fee
Polymarket: 5% of net profit on winners. Kalshi: 7%. Applies on realized gains.
Funding Fee
ACH is cheapest. Debit/credit cards can add 2–3%.
Regulatory & Platform Terms
CFTC / DCM
U.S. regulator and exchange status. Provides legal clarity and fund protection.
Section 1256 Contract
Tax treatment: 60/40 long-term/short-term capital gains split (big advantage).
KYC & Geofencing
Identity verification required on U.S. platforms. Some states may restrict access mid-tournament.
USDC & Polygon
Polymarket’s currency and blockchain. Deposits convert automatically.
Oracle
System (UMA on Polymarket) that brings real-world results on-chain for settlement.
Analytical Terms
Expected Value (EV)
(your_prob × (1 - price)) - ((1 - your_prob) × price) — adjusted for fees.
Kelly Criterion
Optimal bet size formula. Most traders use fractional Kelly (½ or ¼) for safety.
Quick Tips for World Cup Traders
- Always normalize probabilities across mutually exclusive outcomes.
- Check order book depth before large trades.
- Resolution source > everything else.
- You can exit positions anytime — no need to hold until final.
Master these terms and you’ll trade with the precision of a quant instead of guessing like a casual bettor.
The 2026 World Cup runs through July — plenty of time to put this vocabulary to work across group stages, knockouts, player props, and more.
If you have more questions, please feel free to contact me at any time: https://t.me/FatherSon97
Top comments (0)