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Parlay Builder is a free AI parlay generator for NBA, NFL, MLB and
WNBA. Historical hit rates, the game logs behind them, live prices at seven
sportsbooks and a model score come attached to every leg — before you place it, not argued
about after.
The pipeline behind each number is prop → probability → matchup → trend → model → parlay.
Player prop hit rate tool
Look a line up on its own, without building anything. Pick a player, a stat and a
number, and the page answers the only question that matters first: how often has this
actually happened, and over how many games.
Last 5, last 10 and season hit rates, side by side
Not one window — five. Last 3, last 5, last 10, this season and last season are shown
together, each with the games behind it, so a hot fortnight is visible as a hot fortnight
rather than as a season. A short window on its own is the most misleading number in this
category: three games admit only four possible percentages, and one of them is 100%.
Split them by home and away, by opponent and by days of rest, and chart the game-by-game
log against the line underneath.
What a free account adds
Browsing every page, and the day’s top ranked props, needs no email, no card and no
trial countdown running in the background. Building with the AI, saving slips and
tracking how they settle need a free account — which is also free to keep.
Generate a parlay with AI, from a daily allowance of AI actions
Save your slips and track how they settle against the box scores
A 7-day trial of the full board and every tool, no card needed
One prop, all the way through
A real player, a real market, and the games the number is counted from — the same record every prop on the board carries. Tonight’s line, the price at each sportsbook we carry and the market’s own fair estimate load live on the page, because a price cached overnight would be wrong by morning.
A'ja Wilson — Las Vegas Aces · WNBA Assists
A'ja Wilson cleared 2.5 assists in 6 of the last 10 games. That threshold is derived from this player’s own distribution rather than posted by a sportsbook, so it stays true as this page ages; on the live page the same game log is counted against whatever number the books are on today.
Average over the same games: 3.2.
The games behind it — assists, game by game
2026-09-17 @ Seattle Storm — 5
2026-08-28 vs TOR — 2
2026-08-23 @ TOR — 7
2026-08-20 vs Connecticut Sun — 4
2026-08-18 vs Atlanta Dream — 3
2026-08-15 vs Minnesota Lynx — 1
2026-08-13 vs Washington Mystics — 4
2026-08-11 vs Washington Mystics — 2
2026-08-08 @ Minnesota Lynx — 1
2026-08-06 @ Indiana Fever — 3
Measured from official box scores through 2026-09-17.
NFL and WNBA leagues on the board · 386 games scheduled ahead · 149 props scored and priced · 11 min before this snapshot last odds refresh
Six things you can ask it
The chat is not a prompt wrapped around a model. Retrieval, scoring and phrasing are ordinary code reading the same tables the board reads, so an answer arrives as a card with its source attached rather than as a paragraph that might be inventing one.
Find — Rank tonight’s board on measured history against the posted price.
Your saved slips, graded against the final official box score. Losses stay on the record with the wins. Needs a free account.
What powers this, league by league
Every figure below was counted, not estimated. A dataset that could not be measured is left off rather than guessed at, and a league with no live prices says so.
NBA — between seasons: full history, no live prices
Historical game logs — 56,682 player games (2,629 games · through 13 Jun 2026). Official per-player box scores. One row per player per game, and the thing every hit rate on the site is counted from.
Current prop lines — Nothing posted (No games priced. Books post this league’s props when its season is running.). Player prop markets a sportsbook has actually posted for an upcoming game.
Sportsbook pricing — No live quotes (No books quoting this league right now.). The books quoting those markets, line-shopped so the best available price is the one shown.
Model scoring — Idle (Nothing to score until the board has prices on it.). Every posted prop scored against the player’s own log — hit rate, sample, shrunk edge and a letter grade.
Team markets — Nothing posted (No team markets priced in the last day.). Moneyline, spread and totals pricing for the same slate, scored the same way.
Matchup and trend history — 98,958 derived rows (Rest-day splits and per-opponent history, rebuilt nightly from the log.). Form, consistency, streaks, days of rest and performance against a specific opponent, all derived from the game log.
Settlement — Graded on the box score (Same official log the hit rates are counted from.). Saved slips graded against the final official box score. Losses stay on the record beside the wins.
NFL — in season
Historical game logs — 5,062 player games (587 games · through 18 Sept 2026). Official per-player box scores. One row per player per game, and the thing every hit rate on the site is counted from.
Current prop lines — 65 priced props (7 markets · priced 11 min before this snapshot). Player prop markets a sportsbook has actually posted for an upcoming game.
Sportsbook pricing — BetMGM, BetRivers, DraftKings, FanDuel, Hard Rock Bet and theScore Bet (6 of the books we collect are quoting this league.). The books quoting those markets, line-shopped so the best available price is the one shown.
Model scoring — Every posted prop (Scored the moment the price lands — no queue, no subset.). Every posted prop scored against the player’s own log — hit rate, sample, shrunk edge and a letter grade.
Team markets — 1,632 priced sides (Posted in the last 24 hours.). Moneyline, spread and totals pricing for the same slate, scored the same way.
Matchup and trend history — 600 derived rows (Rest-day splits and per-opponent history, rebuilt nightly from the log.). Form, consistency, streaks, days of rest and performance against a specific opponent, all derived from the game log.
Settlement — Graded on the box score (Same official log the hit rates are counted from.). Saved slips graded against the final official box score. Losses stay on the record beside the wins.
MLB — in season, and priced — but no player props posted right now
Historical game logs — 388,078 player games (7,254 games · through 20 Sept 2026). Official per-player box scores. One row per player per game, and the thing every hit rate on the site is counted from.
Current prop lines — Nothing posted (The books have posted player props for this league — we have not scored this slate yet, so it is not on the board.). Player prop markets a sportsbook has actually posted for an upcoming game.
Sportsbook pricing — No live quotes (No books quoting player props here right now.). The books quoting those markets, line-shopped so the best available price is the one shown.
Model scoring — Idle (Prices are posted and this slate has not been scored yet.). Every posted prop scored against the player’s own log — hit rate, sample, shrunk edge and a letter grade.
Team markets — 1,670 priced sides (Posted in the last 24 hours.). Moneyline, spread and totals pricing for the same slate, scored the same way.
Matchup and trend history — 80,455 derived rows (Rest-day splits and per-opponent history, rebuilt nightly from the log.). Form, consistency, streaks, days of rest and performance against a specific opponent, all derived from the game log.
Settlement — Graded on the box score (Same official log the hit rates are counted from.). Saved slips graded against the final official box score. Losses stay on the record beside the wins.
WNBA — in season
Historical game logs — 16,964 player games (883 games · through 19 Sept 2026). Official per-player box scores. One row per player per game, and the thing every hit rate on the site is counted from.
Current prop lines — 84 priced props (7 markets · priced 29 min before this snapshot). Player prop markets a sportsbook has actually posted for an upcoming game.
Sportsbook pricing — BetRivers, Caesars, DraftKings, FanDuel, Hard Rock Bet and theScore Bet (6 of the books we collect are quoting this league.). The books quoting those markets, line-shopped so the best available price is the one shown.
Model scoring — Every posted prop (Scored the moment the price lands — no queue, no subset.). Every posted prop scored against the player’s own log — hit rate, sample, shrunk edge and a letter grade.
Team markets — 852 priced sides (Posted in the last 24 hours.). Moneyline, spread and totals pricing for the same slate, scored the same way.
Matchup and trend history — 21,412 derived rows (Rest-day splits and per-opponent history, rebuilt nightly from the log.). Form, consistency, streaks, days of rest and performance against a specific opponent, all derived from the game log.
Settlement — Graded on the box score (Same official log the hit rates are counted from.). Saved slips graded against the final official box score. Losses stay on the record beside the wins.
Measured against the live database at 20 Sept 2026, 23:55 UTC, when this page was built.
Ask your own AI about tonight’s board
Parlay Builder publishes an MCP connector, so Claude or ChatGPT can read the research directly instead of you reading it out to them.
The board, in your chat
Tonight’s ranked props, a player’s hit rate across five windows, two props compared, the graded record — asked for in plain English, answered from the same data the site reads.
Read-only, and scoped to you
Seven tools, all reads. It cannot place a bet, move money or change anything in your account, and the key reaches no other subscriber’s data.
Our research, not a price feed
It carries measured history and the board’s own ordering. Sportsbook prices stay on the site, where our licence permits showing them.
No user total, no testimonials, no star rating — those are claims about other people. These are operational figures, measured against the live database when this page was built, each with its definition attached.
466,786 player game logs counted. One row per player per game, from official box scores, across the 4 leagues on offer. Every hit rate here is measured over it.
11,353 games on record. Team box-score rows halved. The one-row-per-team invariant is re-checked every build, and the tile drops rather than halve a count that failed it.
1,639,752 sportsbook prices held. Player-prop prices in the odds tables right now. A live inventory, not a running total — a settled slate ages out of it.
7 sportsbooks line-shopped. DraftKings, FanDuel, BetMGM, Caesars, BetRivers, theScore Bet and Hard Rock Bet. Every price comes from one of these; the ingest drops any other book before it lands.
149 props scored on the current board. Across 14 prop markets priced at the coverage snapshot. Moves with the slate; zero for a league that is not playing.
96,155 props in the published replay. Graded offline on 9 August 2026, published whole. Calibration is accuracy about a probability, not an edge over a price. The same replay found the board tracking the market to within the margin it charges, with no configuration tested clearing that margin — so what these figures support is numbers you can check, not an edge.
These are coverage figures, and none of them is a claim of an edge over the market. Measured over 96,155 graded props, the board hit 50.9% where 52.4% is break-even at −110, against a 3.49-point margin — historical testing showed calibration alone is not enough to overcome sportsbook pricing. What the eligibility gate did buy is calibration itself: expected calibration error fell from 0.2319 to 0.0552, and Brier from 0.3217 to 0.2527.
Free AI parlay generator, answered
Is Parlay Builder a free AI parlay builder?
Yes. You can open the board and read the day’s top 3 market-ranked props, with their measured hit rates, without paying and without creating an account. Generating a parlay with the AI is also free, but it needs a free account — it runs against a daily allowance of AI actions. Paid plans raise that allowance and unblur the rest of the board, and they add the bet-slip analyzer and full player research.
Can I use the free AI parlay generator without an account?
Browsing tonight’s board and viewing prop hit rates needs no signup at all. Generating a parlay does need a free account — the first click in the builder opens the sign-up prompt. The account is free, costs nothing to keep, and also lets you save bets to track them later.
How does the AI pick props for a parlay?
Every prop on the board is scored on measured history rather than opinion: how often the player has cleared that line recently and across the season, how the line compares to the implied probability in the current odds, and how consistent the underlying games have been. When you ask for a parlay, the generator searches that scored board for the combination that best fits your leg count, risk level and target payout — so each leg arrives with the games behind it attached.
What does the free plan include?
The day’s top 3 market-ranked props across NBA, NFL, MLB and WNBA, with their historical hit rates and live odds comparison, plus a small daily allowance of AI actions — chat, parlay builds or slip reads, out of one shared budget. The full track record of how past picks did is public to everyone, free or not. Signing up starts a 7-day trial of the full product — the whole board, the bet-slip analyzer, deep player research and 60 AI actions a day — with no card and nothing to cancel. Paid plans unblur the whole board, add the bet-slip analyzer and full player research, and raise the daily AI allowance; hit rates, the model edge against the posted price, correlation and prop history are on every plan, including free.
Does the parlay generator guarantee winning bets?
No — and any tool that claims otherwise is lying to you. Parlay Builder is a research tool. It surfaces bets where the measured probability looks better than the price, which is how you win over the long run, but every individual bet can lose. Bet responsibly; if gambling stops being fun, call 1-800-GAMBLER.
Which sports does the AI parlay builder cover?
NBA, NFL, MLB and WNBA, for both player props and team markets, with odds compared across the major US sportsbooks so you can line-shop before you bet.
Odds and lines come from licensed data feeds and refresh on a schedule; hit rates, edges and grades are Parlay Builder’s own calculations.