Glossary

What is line shopping in sports betting?

Last updated 2026-07-04

Line shopping is checking the same bet's price at many sportsbooks and taking the best one. It is the single highest-return habit available to any bettor: the difference between -110 and -105 on every bet compounds to several percentage points of ROI over a season.

The math is unglamorous and decisive. At -110 the break-even rate is 52.38%; at -105 it is 51.22%. A bettor who wins 52.5% of spread bets is barely profitable at the first price and comfortably profitable at the second, on identical picks. Shopping converts the same skill into more money.

In point-spread sports, shopping for the number beats shopping for the price: finding +3 when the market is +2.5 crosses a key number and changes the bet's win rate, not just its payout. Half the value of a fifty-book feed is simply seeing who has the off number.

Manual shopping across a dozen apps does not survive contact with a full slate; automation does. One /best-lines/ call returns the best available price per outcome across every tracked book, which is line shopping as an API primitive.

Compute it with the API

curl "https://api.theoddsapi.com/best-lines/?sport_key=baseball_mlb" \
  -H "x-api-key: YOUR_API_KEY"

Best price per outcome across all tracked books, precomputed from the same normalized feed. Free key in minutes.

Related terms: Key Numbers · Market Efficiency · Middling · Expected Value (+EV) · Full glossary