Mahomes, a 29-year-old right-hander, was 8-0 with a 3.63 ERA in 39 games last year, all in relief. He made $310,000.
"He kept us in so many games that we were able to come back and win," Mets general manager Steve Phillips said. "We know he'll be a force out of the bullpen this year."
Mahomes, who struck out 51 in 63 2-3 innings, can earn an additional $100,000 in performance bonuses based on a points system. He had asked for $940,000 in arbitration and had been offered $625,000. A hearing had been scheduled for Feb. 14.
Two Mets remain in arbitration: relievers Armando Benitez and Turk Wendell. New York and Wendell were said to be nearing agreement on a one-year contract worth more than $2 million, the midpoint between his $2.15 million request and the team's $1.85 million offer.
Springer, a right-hander who turns 35 next week, opted for free agency after last season rather than accept an outright assignment to the minors from the Florida Marlins.
He was 6-16 with one save and a 4.86 ERA in 29 starts and nine relief appearances, throwing shutouts against Atlanta and Tampa Bay.
Mike Hampton, Al Leiter, Rick Reed and Bobby J. Jones figure to be the Mets' top four starters, while Springer and Mahomes compete for the fifth spot with Bobby M. Jones, Bill Pulsipher, Rich Rodriguez and Glendon Rusch.
"We feel we have added depth," Phillips said. "He's versatile and has proven that he can throw a lot of innings."
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