Every November, as Major League Baseball’s winter market heats up, another, quieter drama begins to unfold an ocean away. It’s the annual moment when Japan’s Nippon Professional Baseball League and MLB connect through one of the sport’s most fascinating agreements — the Posting System. This year, that spotlight shines on Munetaka Murakami, the 24-year-old Tokyo Yakult Swallows slugger who crushed 56 home runs in 2022 and is now poised to take his first swing at the Major Leagues.

The term “posted” carries an almost ceremonial weight. When a player is “posted,” it means he has been formally made available for negotiation with MLB clubs — a process born not from free agency, but from a shared respect between two leagues with different rhythms and traditions. Once a player requests to be posted, his NPB team must agree, and together they enter a 45-day window in which all 30 MLB franchises are invited to negotiate.

Timing is everything. The posting window runs each offseason from November 1 through December 5, a brief period when front offices from Tokyo to Tampa Bay work overtime. If no deal is reached within those 45 days, the player simply returns to Japan — no harm, no foul — and must wait until the next offseason for another chance. It’s a system built to preserve balance, ensuring that the dreams of the player don’t become the losses of his home club.

And make no mistake — there’s a cost to that dream. The MLB team that successfully signs a posted player must pay a release fee to the player’s NPB team, a figure tied directly to the contract’s value. For contracts up to $25 million, the release fee equals 20% of the total deal. Between $25 and $50 million, it’s 20% of the first $25 million plus 17.5% of the remainder. For any amount beyond $50 million, the NPB team earns 15% of that excess. Those fees can climb swiftly — a $60 million deal would mean roughly $10.25 million returning to the player’s Japanese club.

Even minor league deals aren’t exempt. A posted player signing a minor league contract owes his NPB team 25% of the signing bonus, and should he later be added to an MLB roster, a supplemental fee kicks in. Performance bonuses and salary escalators? Another 15% goes back overseas. It’s a meticulous formula — not unlike baseball itself — balancing ambition with accountability, ensuring that Japan’s clubs share in the reward of developing their stars.

The roots of this system trace back to the 1990s, when a few pioneering stars slipped through cracks in the old agreements. Hideo Nomo “retired” from NPB to join the Dodgers, Hideki Irabu forced a trade to New York, and Alfonso Soriano followed his own winding path. Each departure left Japanese teams empty-handed, their investment unrewarded. The Posting System was MLB’s and NPB’s answer — a way to replace loopholes with structure, and chaos with fairness.

Still, the path isn’t open to everyone. Players younger than 25 or with fewer than six professional seasons abroad fall under MLB’s international signing restrictions — their bonuses capped by rigid limits. That’s why 23-year-old phenom Rōki Sasaki, even with a fastball that defies radar guns, entered as an “international amateur free agent,” his market value restrained by rules designed to prevent bidding wars.

​​Through it all, the Posting System has served as baseball’s transpacific bridge — the passage that brought Ichiro Suzuki, Yu Darvish, Masahiro Tanaka, and Shohei Ohtani to America’s diamonds. Now, Munetaka Murakami stands next in line, his swing equal parts power and poetry. The system that governs his journey may read like an accountant’s spreadsheet, but behind those percentages lies something far more human: the enduring exchange of talent, respect, and the shared language of baseball between two nations who understand its beauty in their own way.