Glossary
Best execution (BEST_EX)
A pricing mode that finds the highest final price across all eligible investors, optimizing across both rate and investor.
BEST_EX is the default pricing mode for correspondent operations. The engine runs the full ladder against every eligible investor and returns quotes ranked by final price.
Compare to BY_RATE (pins a rate, compares investors at that rate) and BY_PRICE (pins a price, compares rates).