Build a portfolio of MLB players, trade throughout the season, and win by finishing with the highest total portfolio value. Commissioner sets the league — you set the strategy.
All 1,190+ active MLB players, sorted by price. Search by name, filter by team or position. Each row shows current price, daily change, available float, and a quick BUY button.
⭐ Watchlist
Star any player from the Market tab to add them to your Watchlist. Quickly monitor players you're watching without sorting through all 1,190. Stars are per-league, not global.
💰 Float Column
Shares available to buy across your league. Ohtani has ~59 shares at $168. A $20 rookie has 500. Scarcity is real — if your league loads up on a player, shares run out fast.
01 · STARTING CASH
Everyone starts equal.
Every player in a BallStreet league starts with exactly $10,000 in virtual currency. No advantages, no handicaps. What you do with it is up to you.
RULE 01-A
Equal Starting Cash
All league members receive $10,000.00 on Opening Day. The buy-in is a separate, real-money agreement handled between league members — BallStreet doesn't touch it.
RULE 01-B
Cash is Always Visible
Your available cash is displayed at all times in the top bar. You cannot spend more than you have. Trades are blocked if your cash balance is insufficient to complete the purchase.
RULE 01-C
Portfolio Value = Shares + Cash
Your total equity is the sum of your share holdings at current market prices plus any uninvested cash. Holding cash is a valid strategy — especially when waiting for the right buy opportunity.
RULE 01-D
No Debt, No Margin
You cannot go negative. There is no borrowing, no margin trading, no leverage. If you want to buy, you need the cash. This keeps the game skill-based and accessible to everyone.
02 · HOW SHARES WORK
Shares aren't equal. They're fair.
Every player has a fixed number of shares per league — but the number isn't the same for every player. Instead, every player has roughly the same total market value: about $10,000. That means expensive players have fewer shares available, and cheaper players have more. It's designed to make every player — from Ohtani to a rookie call-up — equally worth owning.
PLAYERPRICESHARES IN LEAGUETOTAL FLOAT VALUE
Shohei Ohtani
LAD · SP/DH
$168.00
59 shares
≈ $9,912
Tarik Skubal
DET · SP
$88.00
113 shares
≈ $9,944
Jackson Holliday
BAL · SS · Rookie
$20.00
500 shares
≈ $10,000
The formula: Float size = floor(10,000 ÷ opening price) × (league size ÷ 10). A 10-person league is the baseline — a 5-person league gets half the shares, a 20-person league gets double. Ohtani in a 10-person league = 59 shares. Same league with 5 members = 29 shares. Scarcity stays consistent no matter the league size.
RULE 02-A
Each League Gets Its Own Float
Share availability is per-league. Ohtani has 59 shares available in your league regardless of what other leagues do. One league's holdings have zero impact on another.
RULE 02-B
Whole Shares Only
You buy and sell in whole share increments. No fractional shares. If Ohtani is at $168 and you have $200, you can buy exactly 1 share — not 1.19.
RULE 02-C
Multiple Owners Per Player
Multiple league members can own shares of the same player. If one member holds 30 of Ohtani's 59 shares, 29 remain available for others. Everyone who holds shares benefits equally from price increases.
RULE 02-D
Scarcity Is Real
If your league buys up all available shares of a player, no one else can buy in until someone sells. Star players with fewer shares — like Ohtani's 59 — can sell out fast in competitive leagues.
03 · ROSTER REQUIREMENTS
Build a real team, not just a slugger pile.
Every BallStreet portfolio must maintain a minimum number of players at each position. You can't load up exclusively on power hitters and ignore pitching — the roster requirements keep strategy balanced and true to baseball.
POSITION
MINIMUM REQUIRED
ELIGIBLE POSITIONS
STRATEGY NOTE
CATCHER
1
C
Catchers are unique — caught stealing, passed balls, and pitch-framing make them the most defensively-driven position on the exchange
INFIELD
4
1B, 2B, 3B, SS
One per infield position minimum. Shortstops and third basemen tend to carry more defensive upside with errors and double plays factoring in
OUTFIELD
3
LF, CF, RF
Three outfield spots. Power-heavy position — outfielders drive the most HR-based price swings on the exchange
STARTING PITCHER
3
SP
Starters pitch every 5 days. Three starters ensures you have coverage across any given week without overlap
RELIEVER
2
RP, CL
Closers are the high-variance play — saves and blown saves create the biggest single-event price swings of any position
FLEX
2–3
ANY
Flex spots are yours to use however you want — double up at a position of strength, or cover a hole while you wait for the right buy
Total roster: ~15–16 players. You must maintain minimums at all times. If you sell below a minimum, you have until the next trade window to replace the position. The commissioner can customize minimum requirements when creating a league.
⚠ ROSTER PENALTY
If your league has roster requirements enabled and you fall below the minimum at any position, a daily cash penalty is deducted from your cash balance — the amount is set by your commissioner when the league is created. Penalties apply each day you remain out of compliance. Your cash balance cannot go negative — if penalties exceed your available cash, no further deductions occur, but your roster remains flagged as non-compliant until you fill the position.
04 · TRADING RULES
Trade freely. Or set limits — your call.
By default, you can trade as often as you want. But the commissioner can set weekly trade limits when creating a league — adding a layer of strategy around when and how you move.
DEFAULT MODE
∞
Unlimited trades per week. No restrictions. Pure market activity.
TYPICAL LIMIT
10
Trades per week. Forces deliberate decisions. Most popular setting.
CONSERVATIVE
5
Trades per week. High stakes on every move. Rewards long-term thinking.
RULE 04-A
Instant Execution
All trades execute immediately at the current market price. There is no delay, no settlement period. The moment you click buy or sell, the transaction is complete and your portfolio updates in real time.
RULE 04-B
No Player-to-Player Trades
All transactions go through the open market — you buy from available shares, you sell back to the market. There are no direct trades between league members. Every transaction happens at the live market price.
RULE 04-C
Weekly Reset
If your league has trade limits, the weekly counter resets every Monday at midnight ET — aligned with the MLB schedule. Unused trades do not roll over to the following week.
RULE 04-D
Roster Minimums Always Apply
You cannot make a trade that would drop a position below its minimum roster requirement — unless you have a replacement transaction lined up in the same session. The exchange won't let your roster go illegal.
05 · INJURY RULES
Injuries happen. You have options.
Injuries are part of baseball. BallStreet gives you meaningful choices when a player goes down — not just a dead roster spot.
STANDARD IL (DAY-TO-DAY / 10-DAY / 60-DAY)
Hold or Sell — Your Decision
When a player is placed on the IL mid-season, you have two options. Sell at the current market price and reinvest the cash, or hold and wait for their return. Price stops moving while they're inactive. The risk is yours to take.
Mookie Betts goes on the 10-day IL. His price is $94.20. You can sell now and lock in that value, or hold and hope he returns healthy and climbs back up.
SEASON-ENDING INJURY · DYNASTY LEAGUES ONLY
Hold for Next Year's IPO
In a dynasty league, if a player suffers a season-ending injury, you get a third option: hold them at your current price as a carry-forward into the next season. If their next Opening Day price is higher than your hold price, you automatically collect the difference. If it's lower, you can still sell at market. In a single-season league, season-ending injuries follow the same hold-or-sell rule as any standard IL.
Spencer Strider tears his UCL in June. His price is $78.40. You hold (dynasty league). Next Opening Day, his WAR-based IPO is $95.00. You collect the $16.60 gain automatically.
⚾ DYNASTY LEAGUES — COMING SOON
Baseball is a dynasty sport. BallStreet should be too.
Unlike other fantasy formats, baseball rewards long-term thinking. Players develop over years, not weeks. A dynasty league lets your portfolio carry forward season to season — your holdings, your cash, your draft position — building a roster the same way a real front office would.
MULTI-YEAR PORTFOLIOS
Holdings carry over between seasons. Your young players grow with you. Your veterans age with you. It's a long game.
INJURY CARRY-FORWARDS
Season-ending injuries don't mean losing your position. Hold injured players at price and collect any Opening Day upside when they return.
ANNUAL RE-DRAFT
Each new season opens a fresh draft window. Add rising stars, cut aging veterans, and reshape your roster — without starting from zero.
Dynasty mode is on the BallStreet roadmap. If your league is interested in being an early tester, reach out through the commissioner settings once it launches.
06 · MID-SEASON CALL-UPS
The next big thing is always available.
When a player is called up from the minors mid-season, they enter the exchange immediately at a standardized IPO price — available to any league member who spots them first.
IPO PRICE
$20.00
Every mid-season call-up enters the exchange at a flat $20.00 regardless of prospect ranking or hype. The market decides their true value from there — based entirely on what they do on the field.
THE OPPORTUNITY
Buy before everyone else does
A top prospect called up in July at $20.00 who immediately starts raking could run to $60–$80 within weeks. But shares are scarce — if your league spots them too, you're competing for a limited float. The early buyer wins.
Rookie with no prior MLB WAR? Also enters at $20 on Opening Day. Same rules apply.
07 · WINNING THE LEAGUE
Highest portfolio value at the final out wins.
When the last game of the MLB regular season ends, the exchange closes. Portfolio values are locked at closing prices. The league member with the highest total equity — shares + cash — takes the pot.
#MEMBERFINAL VALUESEASON CHG
1
MikeT
$14,820.40
▲ +48.2%
2
You
$13,940.50
▲ +39.4%
3
SarahK
$12,110.80
▲ +21.1%
4
JakeR
$9,840.20
▼ −1.6%
5
ChrisM
$7,288.10
▼ −27.1%
Unsold shares count at closing price. You don't need to liquidate your portfolio before the season ends. Any shares you're holding are valued at their final market price. The exchange calculates total equity automatically.
08 · COMMON QUESTIONS
Quick answers.
Can I be in more than one league at the same time? +
Yes. You can join multiple leagues simultaneously, each with its own starting cash, commissioner settings, and standings. Your portfolio in each league is completely independent.
What happens if a player gets traded to another team? +
Trades don't affect price. A player's stats follow them regardless of which team they play for — their BallStreet price is based entirely on individual performance, not team context.
Can I sell shares I don't own (short selling)? +
No. BallStreet does not support short selling. You can only sell shares you currently own. This keeps the game accessible and eliminates the risk of unlimited downside.
What if two players finish with the same portfolio value? +
In the unlikely event of a tie, the tiebreaker goes to the player with the fewest total trades — fewer transactions to reach the same result means better long-term strategy. In real finance, more trades mean more friction and commission drag. The same principle applies here: if you got there in fewer moves, you played the smarter game. If still tied, the player who first reached that final value during the season wins.
Does BallStreet handle the buy-in money? +
No. Buy-ins are handled entirely between league members — Venmo, cash, whatever works for your group. BallStreet is the game engine, not a payment processor. This keeps things simple and means no platform fees on your winnings.
Can the commissioner change rules mid-season? +
Trade limits and house rules are set at league creation and locked for the season. The commissioner cannot change rules mid-season — this protects all members from unfair adjustments once the game is underway.
What happens to my shares at the end of the season? +
The exchange closes at the end of the regular season. All shares are valued at closing price and your final equity is calculated. If you're playing the following season, you start fresh with $10,000 — prior season portfolios don't carry over.
Ready to build your portfolio?
Create a league, join one, or head to your leagues.