Sources & methodology
Where the transactions come from, how we count them, and what the data can tell you.
30-day report · Oct 2, 2026–Nov 1, 2026
- Completed trades
- 6,785
- Leagues with trades
- 2,244
- Dynasty leagues sampled
- 3,549
- League-weeks fetched
- 31,941
Counts describe the leagues we have fetched, including leagues with no trades in this window. They do not represent all of Sleeper. Stored league-week fetches range from 2026-10-31 21:12 UTC to 2026-11-01 19:48 UTC; the newest fetch does not mean every league is current. Read the coverage notes.
Source and collection
Leaguefolio collects public NFL league settings and transactions from Sleeper’s API. Discovery follows a connected network of leagues and managers; this is a convenience sample, not a random sample or a platform-wide census. The crawler’s private database is never shipped to the browser.
Dynasty and format definitions
Only NFL leagues explicitly marked as dynasty (settings.type = 2) are included. Redraft and keeper leagues are excluded. Superflex / 2QB includes a SUPER_FLEX slot or at least two QB slots. 1QB requires exactly one QB slot and no SUPER_FLEX slot. Other or missing QB configurations appear only in All dynasty. Managed and best ball leagues are included and labeled on examples.
Counting rules
Only transactions with type trade and status complete count. Identity is league + season + transaction ID, so a trade observed in multiple week feeds counts once. Each distinct transferred player counts once per trade; player counts are not additive. Picks-only and multi-team trades count in the total. The selected season is Sleeper’s league season, not the calendar year of the event.
Dates and freshness
The event window is 2026-10-02 20:30 UTC inclusive to 2026-11-01 20:30 UTC exclusive. We use status_updated when present, otherwise created; 0 trades use that fallback. Fetch times describe when stored week feeds were retrieved, not the source’s publication time. A new export does not refresh old league-week feeds. Missing or failed fetches are not evidence of zero activity. Coverage includes fetched league-weeks across the selected season, not only weeks inside the event window.
Trade examples and player pages
The explorer searches all collected completed dynasty transactions in the selected season, including multi-team and incomplete records. Its date windows end at the displayed snapshot cutoff; custom dates use inclusive UTC calendar days. Every match can be reached through pagination. The published 30-day reports retain 24 recent examples per format and five per featured player. All transferred assets must resolve to the two participants; unresolved players and incomplete transfers exclude the example, not the activity count. FAAB amounts are preserved in league budget units. Initial player pages feature the 12 most active QB/RB/WR/TE players with at least five distinct leagues and three examples. Previously published player pages are retained on refresh, including zero-activity windows.
Return summaries
For a selected player, return percentages use only complete two-team exchanges where that player was the sole outgoing asset. Trades with additional outgoing players, picks, or FAAB are counted separately, as are multi-team and incomplete records. Categories are mutually exclusive: players only, picks only, FAAB only, or mixed asset types. Common return packages preserve all incoming assets. Picks are grouped by season and round, not eventual position or original team. Sample sizes below ten standalone exchanges are flagged. We do not estimate fair values or assign values to individual pieces of a package.
Interpretation and limitations
Transaction frequency is not a player valuation, directional buy/sell signal, or prediction. A trade can reflect roster needs, scoring quirks, mistakes, or collusion. Displayed settings summarize team count, reception scoring, TE reception bonus, starting lineup size, and lineup mode; other scoring rules are not shown. Settings are observed at collection time, not necessarily at trade time. Compare equivalent formats and inspect full context before acting. Changing sample membership makes raw period-to-period comparisons unreliable.
Privacy and attribution
Public snapshots contain player names, package assets, event dates, aggregate counts, and selected league settings. Manager names, account IDs, league names, league IDs, and transaction IDs are omitted. This limits direct identification but distinctive trades may still be recognizable. Attribute the analysis to Leaguefolio and the underlying transaction source to Sleeper; cite the page URL and snapshot date.
Underlying source: Sleeper transaction API documentation. Research prepared by Leaguefolio.