Odds moved, bet rejected

Arbs get called “risk-free bets”, and that’s almost true. Almost. The maths is on your side, but between the calculation in Pulse and the money in your account there’s the real world: odds move, bets get rejected, bookmakers cut limits, crypto charges fees. This chapter is about what can go wrong and how to live with it. Read it before you play bigger amounts.

The main practical risk

Not “lost the match” (in an arb you’ve covered both outcomes), but didn’t get both legs at the right prices.

Why it happens

• Odds are alive. Between the moment Pulse sees an arb and the moment you confirm, the number can move, especially in live.
• A venue can lower the maximum on a bet or reject it (suspected arb, a technical limit, a line change).
• On prediction markets there may not be enough liquidity for your whole amount at the right price.

What it means for you

If you placed one leg and the second didn’t go through at the right price, you’re not in an arb any more. You’re in a normal bet, with a real risk of losing that leg.

How to lower the risk

• Start with pre-match. Prices are slower there, the window is wider.
• Keep both tabs open in advance and place the legs one right after the other.
• Check the price on the venue before confirming, not from memory.
• Don’t chase hundredths of ROI at the start. Take arbs with room, where a small move doesn’t eat everything.
• Have a plan B. Stuck with one leg? Complete it on another venue or close it with a minimal loss. We’re not gambling here, we’re earning on opportunities.