Check the bet before you place it.
Rate your parlay, free. Paste up to six MLB, NFL or NBA player props from any sportsbook. ET checks each leg against the data, grades the slip, and shows you what deserves a second look.
Slip Check is also an app for NFL slips, with screenshot scanning and a recap the morning after.
Track record: how accurate have these grades been?
On September 10, 2026, ET started lowering the numbers it shows to what its record supports. Since then it has graded 1,278 MLB board reads written before first pitch, through September 27, 2026. Misses stay in the count. Under three weeks of regular-season games is a short record, so treat each row as a first look.
One market at a time, because a home run and a hit are different bets with different odds. Each row is what the model said, how many reads it said it on, and how often they landed.
Home runs · 329 reads
| ET said | Reads | Average | Landed |
|---|---|---|---|
| 10 to 20% | 292 | 17% | 20% |
| 20 to 30% | 30 | 22% | 3% |
Total bases · 345 reads
| ET said | Reads | Average | Landed |
|---|---|---|---|
| 30 to 40% | 324 | 38% | 41% |
One or more hits · 285 reads
| ET said | Reads | Average | Landed |
|---|---|---|---|
| 60 to 70% | 282 | 63% | 61% |
Hits plus runs plus RBIs · 319 reads
| ET said | Reads | Average | Landed |
|---|---|---|---|
| 40 to 50% | 308 | 49% | 49% |
Average is what the model said on average inside each band. Bands with fewer than 30 graded reads aren’t shown, because a number built on twelve outcomes isn’t a number.
The postseason, counted on its own
From late September the board ran on one to four games a day instead of fifteen, and it still filled the same number of spots. So the top of the board was most of a few rosters, and pitchers and hitters with no batting data sat there on the model’s default numbers. Those reads said more than landed.
On October 13 we changed the board to score only hitters with a real batting line this season. The reads below were shown to people, so they are in the record, in their own table, instead of folded into the regular season or left out.
987 postseason reads graded between September 29, 2026 and October 24, 2026, each written before its game started.
| Market | Reads | Said, on average | Landed |
|---|---|---|---|
| Home runs | 272 | 12% | 9% |
| Total bases | 309 | 35% | 27% |
| One or more hits | 184 | 58% | 50% |
| Hits plus runs plus RBIs | 222 | 43% | 38% |
One row per market, because a postseason market has too few reads to split into bands.
Before September 10 the numbers ran high, most of all at the top of each market. See every graded read since April 14, market by market →
Questions
Can you rate my parlay?
Yes, free, with no account. Paste your parlay above, up to 6 MLB, NFL or NBA player props. Each leg shows how often it lands and where that number comes from, the slip shows what it pays against what it needs to land, and the weakest leg is named when one sits clearly below the rest. Every number on it comes with ET’s track record, misses included.
How do I check if my parlay will hit?
No tool can tell you it will. What you can check is how likely each leg is, which leg is weakest, and how much the whole slip needs to go right. Paste your legs above. Each shows how often it lands and where that number comes from, and the legs combine into one chance for the slip. Add the slip’s total odds to see what it needs to land to break even.
Is this parlay checker free?
Yes. You need no account and no card. You can paste up to 6 MLB, NFL or NBA player props per check, 5 checks a day per connection. It is not a sportsbook and takes no bets.
What is ET’s track record? How accurate have its grades been?
Since September 10, 2026, ET has graded 1,278 MLB board reads written before first pitch. In the biggest group, total bases rated 30 to 40%, it said about 38% and 41% landed. Before that date the numbers ran high, most of all at the top of each market. You can see every graded read since April 14, market by market, on the page about whether betting prediction apps are accurate.
Which leg of my parlay is the weakest?
Slip Check names a leg only when it sits clearly below every other leg on your slip, by the chance each leg shows: ET’s number for MLB legs, the books’ price for NFL and NBA legs. If none of your legs stands out, it tells you so instead of guessing. Usually your weakest leg is the one with the longest price.
Is this an AI parlay analyzer?
No. ET uses statistical models graded against what actually happened, and it shows how often its numbers have landed, misses included.
Why does one of my legs show no number?
The free checker covers the top of each MLB market on today’s board, NFL player props before kickoff and NBA player props before tip-off. An NFL or NBA leg shows the books’ price at your exact line, so a line no book in ET’s odds feed is offering shows no number unless you paste its price next to it. A game that has started shows none either. When you sign in as a member, you get the full MLB pool.