Arbitrage Betting Guides
Everything you need to understand arbitrage betting — “sure bets” — explained in plain English. Simple definitions, real worked examples with numbers, and no marketing fluff.
If you're new to this, read them in order: what arbitrage betting is, then whether it's legal in Greece, then run your own numbers in the calculator. If you're comparing tools rather than learning the mechanics, start with what to look for in software for Greek bookmakers.
Arbitrage calculator →
Free interactive tool: enter the odds and get the stake split, profit % and locked-in return if every leg is placed. 2 or 3 outcomes.
Best software for Greek bookmakers →
What to look for in arbitrage software for the Greek market — bookmaker coverage, refresh speed, exchanges and prediction markets — and where ArbPlay fits.
What is arbitrage betting?
The core explanation: what a “sure bet” means, when the maths locks in a margin, the real risks, and a step-by-step worked example with numbers.
Is it legal in Greece?
Yes — and why. HGC licensing, tax on winnings, the 21+ age limit, and account limiting.
Back & Lay: betting exchange
What it means to bet against an outcome, what liability is, and how it unlocks arbitrage.
What are prediction markets?
Polymarket and Kalshi explained: shares priced in cents, why the price is a probability, and why buying No is a lay bet.
Prediction markets vs exchanges
Counterparty, vocabulary, fee models, currency and liquidity compared side by side — and which is cheaper for arbitrage.
Arbitrage with prediction markets
Pick Polymarket or Kalshi as your lay side, read the Buy Yes / Buy No breakdown, set the fee and place both legs in the right order.
Polymarket & Kalshi arbitrage tools
What to look for when a prediction market is your cover leg: Buy No in cents, the price-dependent taker fee, and how ArbPlay scans both venues.
How to calculate a sure bet
The formula, the profit percentage and the stake split — with a worked numeric example.
Arbitrage vs value vs matched
Risk, profit and variance — which strategy suits whom, with a comparison table.
7 mistakes & account limiting
The most common mistakes and practical ways to avoid being limited or gubbed by a bookmaker.
Glossary
Back, lay, liability, commission, gubbing and other terms — explained simply.
Billing & account
How to pay with crypto
Getting USDT, reading the checkout invoice, sending on the right network, and when your access switches on.
For developers
Greek bookmaker odds as JSON →
A developer's guide: raw bookmaker JSON vs a normalized feed, matching events across seven Greek bookmakers, freshness and getting a key.
Odds HTTP API hub →
Seven bookmakers compared — coverage, freshness, Betradar ids — plus real samples, the OpenAPI spec and marketplace listings.