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A lead is a two-leg purchase that, because of a proven relation, pays at least 1whateverhappens.Whenthetwolegscostlessthan1 whatever happens. When the two legs cost less than 1 together, the difference is the edge. For example, if “49ers over 10.5 points” implies “49ers over 3.5 points”, then buying No on the first and Yes on the second pays $1 in every score: At 5¢ and 90¢ the pair costs 95¢ for a guaranteed $1.

What a lead reports

Only leads with depth.executable could be filled at a profit when the books were read. Everything else is priced from top-of-book asks and may be too thin to fill. Leads are observations, not quotes: prices move between the run and your order.
To be told when a lead becomes executable, subscribe to the lead.executable webhook.