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PROSPX is a MLB prospect/farm system evaluation and scouting module created for @eephus_io by @ARKNDJL

Joined May 2026
Photo by PROSPX (@MLBPROSPX)Photo by PROSPX (@MLBPROSPX)Photo by PROSPX (@MLBPROSPX)Photo by PROSPX (@MLBPROSPX)
general breakdown of how eWAR will improve on fWAR/bWAR eWAR includes: ABS/pitch economy run value, derived defensive/positional adjustments, eBR (baserunning), SDR (defense) @eephus_io will have stats/data for minor league defensive value. we will also have prospect eWAR
me and @WillColqhn 's eephus WAR metric (eWAR) will be launching on the site soon. eWAR will improve WAR through: -baserunning metric eBR -validated positional ladder/defensive adjustments -run value for ABS challenges, pitch economy (P/AB, P/IP) -defensive metric SDR (ask will)
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me and @WillColqhn 's eephus WAR metric (eWAR) will be launching on the site soon. eWAR will improve WAR through: -baserunning metric eBR -validated positional ladder/defensive adjustments -run value for ABS challenges, pitch economy (P/AB, P/IP) -defensive metric SDR (ask will)
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A full showcase, preview, and breakdown of the future of @eephus_io ! Incredibly excited for you guys to be able to use the full version of the site later this year. Very thankful for the support that I've received on my journey throughout making this project, thank you so much.
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a look into what's coming next for @eephus_io and PROSPX!
ENORMOUS @eephus_io UPDATE (SNEAK PEEK STREAM, EXTENSIVE DETAILS INTO EACH MODULE, ROADMAP FOR FUTURE) I will be hosting a preview/sneak peek stream/Q&A on the community discord this Sunday. I'll stream it on Twitch and the VOD will be posted to my YouTube as well. This will be the last major "preview" before my local version of the program is just the public site. I have built out the website to the point where many of, if not all of my modules/models/metrics are at the forefront of the public industry. Below is a list of all of the modules on the site, as well as everything I'll be going over on the livestream (as well as how I created/derived all of it): SITE HOMEPAGE: Prospect news ticker, Today in Prospect History, Top eFV Movers, Recent Debuts/Trades, eFV distribution chart, prospect news/spotlight sidebar, and UI/UX design + navigation through the site. PROSPX: Flagship model, MiLB prospect eFV grades (industry-leading FV model), ETA projections, in-house prospect writeups from our analyst team, Prospect Spotlights/Breakouts/Risers/Fallers/Rebounders, Farm System Grades/Rankings/Details, Transaction Log, Injured List, Stat Leaderboards, Debut Tracker, MLB Draft/High School/International Amateur/Overseas comprehensive analysis and pages (and MLB-translation coefficients), Prospect "Time Machine" where you can view previous eFV grades/boards at any point in time, and prospect Scatterplots. CollegeSavant: Built by me and Joseph Gillis, Statcast data on college hitters/pitchers, college team tendencies, as well as projected MiLB translated stats for these prospects MLB Free Agency: Projected free agent contract modelling (guaranteed salary, length, and AAV), as well as team fit projections, % chance of players/teams opting out of club/player/mutual options, and projected value players in free agency. Also features a standalone $/WAR in free agency page that breaks down and charts $/WAR over each offseason. MLB Projections: Extensive MLB projections with aging curves, role projections, and expected team control/surplus value, powered by in-house metrics and projection modelling. Also features MLB-level projections for prospects based on eFV. MLB Stats: Extensive MLB Stats module, featuring both public leading stats like xwOBA, xFIP, etc. as well as in-house metrics that I've created that have proven to be more predictive than even the leading industry stats. Featuring eWAR, created by me and @WillColqhn , which seeks to improve upon WAR by providing real, calibrated defensive adjustments rather than the current industry ballpark estimates. Individual sections for Overall, Hitters, Starters, Relievers, Defense, and Leverage, ft. many metrics that I've talked about creating - the Evaluation Metric+ family (HEM+ for hitters, SEM+ for starters, REM+ for relievers, DEM+ for defense), as well as many other metrics I'm excited for you guys to see and use (xEM+ family, WAR/PA+, WAR/IP+, pLI, Clutch, and WPA/LI) Alchemy Lab: RP->SP and SP->RP conversion candidate model and tracker, based on pitcher profile, pitch mix, and injury history of previous conversion candidates. Positional ladder showing our calculated defensive adjustments that we use for eWAR will be here as well. Reverse-platoon radar, prospect watch (for SP prospects who may profile better as relievers, or vice versa), pitch-add lab that suggests pitch mix additions / which pitches that pitchers should throw more based on platoon splits and qualitative baseball knowledge, and a "misplaced hitters" section that suggests positional changes for hitters struggling defensively (or that could be better suited at a different position) based on range, physical tools like arm strength, height/weight/BMI, etc. Trade Machine: Fully functional trade machine that can evaluate potential trades, includes prospect surplus projections from PROSPX and MLB-level surplus projections, as well as factoring in arbitration/pre-arbitration surplus from... Arbitration Predictor: Extensive arbitration/pre-arbitration prediction model that correlates MLB production with arb/pre-arb amount received based on past arbitration negotiations. The arb/pre-arb projections derived here are used across the rest of the site to provide more accurate surplus values for arb/pre-arb players. Also includes team view which shows which teams have the most players under arb/pre-arb control, which leads into... Club Ledger: Extensive financial analysis module that explores the surplus value, CBT payroll/individual player salaries, arb/pre-arb control, core control, and individual club finance pages, as well as much more. Also includes new financial metrics I've created to evaluate club spending/financial efficiency, like Cost+, OrgSur+, etc., leads into... MLB Franchises: Module for each MLB franchise that rolls up information from other modules into an extensive franchise breakdown for each team and grade tree page, also easily navigable to other associated modules on the site. Rounds up all of the MLB club specific modules into one: Farm system grades, financial grades, future projections, surplus value, etc. to provide an extensive club/franchise overview of the current contention status and future outlook of each franchise. Generate GFX: Every single module on the site features Generate GFX, which will format any individual page into an exportable PNG/copy-pasteable screenshot to post on social media /// DIAMOND MODULES These modules will be subscription-based and will effectively subsidize the rest of the site and associated baseball research/modelling to remain public and free. Probably 10$/month, will also have a supporter tier for 5$/month? Not sure yet. Anyway, here are the Diamond tier modules! Fantasy Baseball: module featuring fantasy baseball tools for dynasty/redraft/DFS leagues, as well as daily streamers, buy low/sell high candidates, and projected baseball prospects who are most suited for fantasy production. Also will feature a fantasy trade calculator. Scoring based on standardized points/categories scoring, but will have an option for individual league scoring to be plugged in eventually. Sports Betting: Module featuring prediction market/sports betting market models that use metrics from the rest of the site in order to create industry-leading predictions and edges against prediction markets/sportsbooks. Will feature a Pick of the Day, parlay builder, player props, futures bets, and a publicly-available record and model validation section. Baseball Cards: Module that uses PROSPX data to identify which prospect baseball cards (and MLB level baseball cards) are over/underbought, and to provide a predicted "true" value of each card based on eFV and expected WAR production. /// THE FUTURE The site will be fully functional and updated by preseason next year at the latest. I will not begin offering paid subscriptions for the site (everything will be free except for fantasy baseball/sports betting tools, which will require a subscription) until everything is as pristine as I want it to be. FUTURE ROADMAP (not until next season): -Extensive on-site forum implementation -Published writing schedule for analysts -Industry tracker for source prospect updates/analysis -Transparent financial breakdown of site It has been a joy working on this project over the last months, this is the project I'm proudest of creating in my entire life, and I cannot thank the eephus community and development team enough for helping me make this site a reality. We are so close to a full launch! I'll see you on the stream tommorow (or on the VOD) :)
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Replying to @ARKNDJL @eephus_io
The Club Ledger module is a comprehensive financial evaluation of each MLB organization, complete with surplus values (and incorporating prospect surplus values from PROSPX), payrolls/salaries from each team, and financial efficiency grades and evaluations for each club. I've created new metrics like Cost+ (projected wins above replacement per million dollars of next season's CBT payroll, indexed so that 100 is the league mean and each 10 points is one standard deviation across the thirty clubs), $/win for each club, and $/WAR for each club, as well as incorporating metrics like OrgSur+ (Capital-efficiency index for farm systems) from PROSPX.
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I have created a new Club Ledger module that will be available on @eephus_io (details in replies). The chart below showcases Controlled Surplus (y-axis) vs. Competitive Balance Tax Payroll from 2026 (x-axis), both in $M. Brewers lead the MLB in controllable surplus value.
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my site @eephus_io is back up! i wanted to let you knoe that we're targeting the offseason for the full launch of the site. will be complete with up to date industry leading models throughout all modules (read below for full site info/updated scope!): -PROSPX (eFV, farm systems, MiLB prospect scouting/grades/rankings/stats, overseas scouting, draft scouting, HS/State profiles, scatterplots/leaderboards/breakout identifier) -MLB Projections (introducing eWAR, our own in house WAR model w/ improved positional/defensive adjustments) -MLB Stats (ft. HEM+/SEM+/REM+/DEM+/RIV+, MLB player card pages Arbitration Predictor, platoon splits/analysis) -Free Agency predictor/tracker (AAV/length/guaranteed prediction model, team fits, live free agency tracker) -Team Payrolls (contracts, core control, etc) -Hall of Fame/Cooperstown Watch (JAWS, young players on HoF trajectories, HoF predictions) -In Game Management (baserunning, management decisions, manager leaderboards) -Alchemy Lab (RP->SP candidates, SP->RP candidates, swing tweak lab, pitch mix lab/suggestions, reverse platoon watch, positional change model) -CollegeSavant (college Statcast, college->MiLB projected stats, etc) DIAMOND MODULES (paid tier): -Fantasy Baseball (redraft, dynasty, DFS, daily streamer model, etc) -Sports Betting (pick of the day, edge finder model, prop model, futures model) -Baseball Cards (value finding model using eFV vs listed prices of Bowman autos) other stuff: -Forum functionality -Generate GFX functionality across all pages -Weekly articles written by our growing scout/analyst talent pipeline -Community discord (now open!) -Live transaction log that shows prospect promotions/demotions/eFV grade changes My goal is to lead the public sector in mathematical AUC/Spearman score for accuracy/precision across every model. The eFV model has already gotten to this point by a wide margin and I'd like for the other models across other modules to do the same. Any other ideas for stuff you'd like to see, please lmk! Really excited about everything and super hyped for you guys to see everything that's on my local version.
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PROSPX retweeted
An update on what's coming soon!
my site @eephus_io is back up! i wanted to let you knoe that we're targeting the offseason for the full launch of the site. will be complete with up to date industry leading models throughout all modules (read below for full site info/updated scope!): -PROSPX (eFV, farm systems, MiLB prospect scouting/grades/rankings/stats, overseas scouting, draft scouting, HS/State profiles, scatterplots/leaderboards/breakout identifier) -MLB Projections (introducing eWAR, our own in house WAR model w/ improved positional/defensive adjustments) -MLB Stats (ft. HEM+/SEM+/REM+/DEM+/RIV+, MLB player card pages Arbitration Predictor, platoon splits/analysis) -Free Agency predictor/tracker (AAV/length/guaranteed prediction model, team fits, live free agency tracker) -Team Payrolls (contracts, core control, etc) -Hall of Fame/Cooperstown Watch (JAWS, young players on HoF trajectories, HoF predictions) -In Game Management (baserunning, management decisions, manager leaderboards) -Alchemy Lab (RP->SP candidates, SP->RP candidates, swing tweak lab, pitch mix lab/suggestions, reverse platoon watch, positional change model) -CollegeSavant (college Statcast, college->MiLB projected stats, etc) DIAMOND MODULES (paid tier): -Fantasy Baseball (redraft, dynasty, DFS, daily streamer model, etc) -Sports Betting (pick of the day, edge finder model, prop model, futures model) -Baseball Cards (value finding model using eFV vs listed prices of Bowman autos) other stuff: -Forum functionality -Generate GFX functionality across all pages -Weekly articles written by our growing scout/analyst talent pipeline -Community discord (now open!) -Live transaction log that shows prospect promotions/demotions/eFV grade changes My goal is to lead the public sector in mathematical AUC/Spearman score for accuracy/precision across every model. The eFV model has already gotten to this point by a wide margin and I'd like for the other models across other modules to do the same. Any other ideas for stuff you'd like to see, please lmk! Really excited about everything and super hyped for you guys to see everything that's on my local version.
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PROSPX retweeted
eFV update will also include a predictive machine-learning based driver submodel which will build a player's health profile based on their IL history, stints, and injury specifications and weight this to boost (durability) or drop (fragility) a prospect's eFV grade
eFV UPDATE LOG #1: Testing Contextual Prospect Wisdom Mathematically + eFV Weighted Production Drivers In baseball prospect development, there are certain explanations behind MiLB production in different contexts that I feel are imperative to implement into models. In today's eFV update, I've made (and am still working on) making the eFV model more "context aware", and in the process, aiming to test, prove, or disprove many of the colloquial wisdoms of scouts in regards to the correlation between a prospect's MiLB production context and its correlation to MLB-level production. The first thing I'm aiming to test today is the correlation between cummulative/volume-based prospect statistics/milestones and their translation to MLB production. For example, how many prospects who hit 30+ home runs within a single season went on to become MLB regulars, stars, or superstars? Is there a correlation between "milestone" statistics like these and eventual MLB production? The next thing I'll be testing today is the concept of "league context" in the Minor Leagues. Many scouts (including myself) believe that Double-A is the level most correlated to MLB Production. My model has proven that performance at Double-A actually has a higher correlation with MLB Production than performance at Triple A (I will be writing a separate paper on this soon). As such, wouldn't it be ideal for eFV drivers, specifically production/statistical based ones, to be weighted by strength of correlation between the production at that Minor League level vs. MLB Production? I am actively testing this right now and will probably post an update tweet in a bit. Many scouts (including myself) believe that the Pacific Coast League/PCL conference is a very hitter-friendly conference, due to ballpark altitudes and dimensions in this conference. The next thing I'll be working on today is testing this hypothesis, checking to see if specific outlier conferences should have eFV weighted-production. Through these examples, I'm having more and more ideas about how eFV can acquire more "context" regarding production. eFV already features age-vs-level relative weighting for prospects, but I believe that implementing age-vs-level weighting directly into statistical production drivers may be an enormous breakthrough in this area for me, as it would improve the currently "flat" age-vs-level drivers significantly. If you read this entire thing, thank you. If you have any questions about any of this, thoughts to add, or ideas you'd like me to test in regards to specific prospect correlations to MLB Production, let me know. eFV has become the most accurate public FV Grading System by a wide margin through its "outcome-grounded" driver derivation model, and any hypotheses or thoughts you have on specific traits/attributes/metrics that could (or you think should) be correlated with MLB Production, please reply below!
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PROSPX retweeted
eFV UPDATE LOG #1: Testing Contextual Prospect Wisdom Mathematically + eFV Weighted Production Drivers In baseball prospect development, there are certain explanations behind MiLB production in different contexts that I feel are imperative to implement into models. In today's eFV update, I've made (and am still working on) making the eFV model more "context aware", and in the process, aiming to test, prove, or disprove many of the colloquial wisdoms of scouts in regards to the correlation between a prospect's MiLB production context and its correlation to MLB-level production. The first thing I'm aiming to test today is the correlation between cummulative/volume-based prospect statistics/milestones and their translation to MLB production. For example, how many prospects who hit 30+ home runs within a single season went on to become MLB regulars, stars, or superstars? Is there a correlation between "milestone" statistics like these and eventual MLB production? The next thing I'll be testing today is the concept of "league context" in the Minor Leagues. Many scouts (including myself) believe that Double-A is the level most correlated to MLB Production. My model has proven that performance at Double-A actually has a higher correlation with MLB Production than performance at Triple A (I will be writing a separate paper on this soon). As such, wouldn't it be ideal for eFV drivers, specifically production/statistical based ones, to be weighted by strength of correlation between the production at that Minor League level vs. MLB Production? I am actively testing this right now and will probably post an update tweet in a bit. Many scouts (including myself) believe that the Pacific Coast League/PCL conference is a very hitter-friendly conference, due to ballpark altitudes and dimensions in this conference. The next thing I'll be working on today is testing this hypothesis, checking to see if specific outlier conferences should have eFV weighted-production. Through these examples, I'm having more and more ideas about how eFV can acquire more "context" regarding production. eFV already features age-vs-level relative weighting for prospects, but I believe that implementing age-vs-level weighting directly into statistical production drivers may be an enormous breakthrough in this area for me, as it would improve the currently "flat" age-vs-level drivers significantly. If you read this entire thing, thank you. If you have any questions about any of this, thoughts to add, or ideas you'd like me to test in regards to specific prospect correlations to MLB Production, let me know. eFV has become the most accurate public FV Grading System by a wide margin through its "outcome-grounded" driver derivation model, and any hypotheses or thoughts you have on specific traits/attributes/metrics that could (or you think should) be correlated with MLB Production, please reply below!
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Top 100 MLB Prospects via my eFV model, week of 8/18/2026 update. The @eephus_io site will be back up soon, sorry again for the long delay, lots of enormous improvements and new features coming.
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Twins SS Marek Houston continues to rocket up the eFV rankings as his hitting breakout continues, now up to 53 eFV / #19 MLB (#3 MIN). Houston has been electric recently and, with a glove first profile already, the power potential that he's flashing is a real gamechanger for him
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Mets 21y/o 2B/SS Mitch Voit is an ENORMOUS riser on the latest eFV model update, now graded at 50 eFV / #67 MLB (#2 NYM). Voit has been unbelievable recently following his promotion and is now officially a Top 100 prospect on @eephus_io
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PROSPX retweeted
Farm system rankings via my @eephus_io farm system model following the trade deadline Farm systems are graded on four "canopy" grades, which take into account both the current talent in the system and the performance of the farm system over the last 7 years
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PROSPX retweeted
17y/o Kansas City Royals CF Angeibel Gomez is ranked ridiculously high on the @eephus_io eFV model (#32 MLB / 52 eFV), even with the model having a derived penalty for DSL/CPX stats. He's been incredible thus far w/ loud tools. This season: 1.068 OPS, .263 ISO, 15.8%BB-10.5%K
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PROSPX retweeted
My eFV model for @eephus_io has been upgraded even FURTHER, now @ .393 Spearman score (grade vs. realized WAR) & .758 AUC grade (predicting "became a contributor). Both lead public scouting grade industry by a wide margin. eFV is also now 65% closer on the biggest disagreements.
POST DEADLINE @eephus_io / eFV TOP 100 UPDATE T100 prospects traded (rank/eFV): RF Zyhir Hope (#25/53) LAD->DET SS Arjun Nimmala (#47/51) TOR->LAA SS Jefferson Rojas (#49/51) CHC->NYM CF Josiah Ragsdale (#77/50) MIL->STL SP Ramon Marquez (#88/49) PHI->SFG SP Anthony Eyanson (#90/49) BOS->BAL RF Alexander Frias (#93/49) MIL->STL CF Enddy Azocar (#94/49) BOS->BAL
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PROSPX retweeted
POST DEADLINE @eephus_io / eFV TOP 100 UPDATE T100 prospects traded (rank/eFV): RF Zyhir Hope (#25/53) LAD->DET SS Arjun Nimmala (#47/51) TOR->LAA SS Jefferson Rojas (#49/51) CHC->NYM CF Josiah Ragsdale (#77/50) MIL->STL SP Ramon Marquez (#88/49) PHI->SFG SP Anthony Eyanson (#90/49) BOS->BAL RF Alexander Frias (#93/49) MIL->STL CF Enddy Azocar (#94/49) BOS->BAL
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PROSPX retweeted
Top 100 MLB Prospects by eFV model (@eephus_io / @MLBPROSPX), August Update. The eFV model has been upgraded and improved even further, this iteration of the model is now the most accurate that it's even been by a wide margin (more on this below) ft. draft prospects added!
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eFV model on @eephus_io has been improved even FURTHER to a .384 Spearman ρ . eFV is also 64% closer on the biggest disagreements now, up from ~54% previously. Upgraded eFV model as well as new/upgraded modules/models/metrics across the board will be available on the site soon!
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Santucci has been great I wonder when he'll get to the Show @MLBPROSPX has his ETA at early 2027
Mets #2 Prospect Jonathan Santucci is coming to Cuse! Jonathan Santucci has an ERA of 3.28 in his minor league career! Here we go Jonathan! 😤
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