Brock Purdy and Justin Herbert have been on opposite sides of 33 real dynasty trades.
Not simulations and not a calculator lining up two numbers. Every one of them is a completed trade from a public Sleeper league, graded at the player values that were current on the day it happened.
Most of those were larger deals with other pieces attached. 1 of them were straight up: Brock Purdy for Justin Herbert, nothing else changing hands.
This is the part a calculator cannot tell you. In 10 of these deals exactly one side had to attach something extra, and 10 of those 10 times it was the Brock Purdy side (0 the other way). The side that keeps having to add is the side holding the lesser asset, so the market has been treating Justin Herbert as the more valuable of the two.
Everything above is priced on the day each deal happened, which is the only honest way to grade a completed trade. It is not what they cost now. Today Brock Purdy prices at 2,114 and Justin Herbert at 3,160, so the market currently rates Justin Herbert about 1.5x the other. A pair can lean one way across its history and price the opposite way now; that gap is the whole reason to check the deal in front of you rather than the deal someone made in 2023.
Values as of 2026-07-24.
| Date | Margin | Went with Brock Purdy | Went with Justin Herbert |
|---|---|---|---|
| 2026-06-30 | +8% | Rashee Rice, 1 2nd | Xavier Worthy |
| 2026-06-24 | -16% | Mike Evans | — |
| 2026-05-10 | -34% | 1 1st, 1 2nd | Ashton Jeanty, 1 later pick |
| 2025-10-18 | +5% | 1 1st | — |
| 2025-09-24 | -20% | Troy Franklin, 1 2nd, 1 3rd | — |
| 2025-09-02 | -9% | Stefon Diggs, Cooper Kupp, George Kittle, 1 3rd | Xavier Legette, Tory Horton, Colston Loveland, 1 2nd |
| 2025-07-22 | -34% | — | — |
| 2025-06-20 | -38% | Oronde Gadsden | — |
| 2025-06-19 | -17% | Ja'Marr Chase | Justin Jefferson |
| 2024-11-24 | -14% | Jordan Whittington, Rashid Shaheed, 2 3rds | Darnell Mooney, Jaylen Warren |
Read each row as: Brock Purdy, plus anything in the third column, was traded for Justin Herbert plus anything in the fourth. An em dash means that side sent nobody else. Margin is the value gap at that day’s prices from the side that received Brock Purdy; positive means that side came out ahead.
Across all 33, the whole-deal value gap runs -8.6% from the side that received Brock Purdy, so the side ending up with Justin Herbert has generally come out ahead on face value. That measures the entire trade, every piece included, not these two players against each other.
A calculator answers “is Brock Purdy for Justin Herbert fair” by subtracting one number from another, and it gives every manager in your league the same answer. That tells you nothing about whether the trade closes. What closes it is whether one side has to attach a piece, and which side that usually is. The 33 deals above are the record of what leagues actually agreed to when these two were on the table together.
How trade fairness actually works →
Every Brock Purdy trade · Every Justin Herbert trade
All players with real trade data →