Glossary
Line movement (steam)
Line movement is how a market's odds shift before an event as money and information arrive; a sharp, sudden move is often called steam.
Odds move as books take bets and adjust to information. A steam move is a sharp, coordinated shift, usually following sharp money. Tracking movement, especially toward the closing line, helps gauge where the market thinks true probability sits.
Capturing movement needs fresh, consistent data through to the off — which a normalised, regularly-polled feed provides, so a product can record how prices evolve.
OddsRelay delivers this as part of one already-matched feed. See live coverage on the coverage dashboard.