Everything
behind the
number

League platforms

Public, read-only league context: rosters, settings, drafts, matchups, transactions.

• ESPN - protected active - 5 capabilities: public league context, live draft picks, historical draft results, league settings, roster rules.
• SLEEPER - protected active - 8 capabilities: public league context, live draft picks, historical draft results, league settings, rosters, transactions, matchups, trending players.
• YAHOO - protected active - 5 capabilities: public league context, league settings, rosters, weekly player projections, external league benchmarks.

NFL performance data

Official-style box scores, weekly player stats and season summaries feeding team and player DaD numbers.

• nflverse_play_by_play - open project with underlying rights caveat - football input
• nflverse_rosters_schedules - open project with underlying rights caveat - football input
• nflverse_next_gen_weekly - public summary with underlying rights caveat - football input
• nflverse_depth_charts - open project with provider change history - football input
• nflverse_snap_counts_advanced - open project with underlying provider caveat - football input
• nflverse_ftn_charting - open charting subset share alike - football input
• ffopportunity_expected_points - open model and derived data share alike - derived football input
• nws_forecast_vintages - official government public domain unless annotated - football input
• fantasyfootballcalculator_adp - documented public api - context only
• sleeper_public_context - documented read only api noncommercial - context only
• collegefootballdata_api - documented commercial api - football input
• official_nfl_injury_reports - official public evidence manual or approved adapter - football input
• nfl_big_data_bowl_tracking - competition data noncommercial restricted - research method
• historical_market_lines_research - market data rights caveat - external baseline

Trade and valuation markets

Real-trade-derived prices and pick values. Market price is what people pay; it is never presented as what a player will produce.

• DraftADynasty first-party observations - accepted_or_rejected_recommendations,consented_player_comparisons,model_feedback,proprietary_market_signal
• FantasyCalc - external_market_benchmark,trade_comparison_baseline
• Fantasy Football Calculator ADP - redraft_draft_market_rank,public_adp_context,opponent_pick_timing
• DynastyProcess open data - open_dynasty_value_benchmark,multi_source_trade_consensus,future_pick_value_benchmark
• FTN charting via nflverse - offensive_scheme_features,play_level_charting,pressure_and_receiver_context
• nflverse core data - historical_play_by_play,player_and_team_statistics,player_identity_bridge,rosters_and_schedules
• Sleeper documented read-only API - draft_and_transaction_context,league_scoring_and_format,rosters_and_matchups,sleeper_player_identity
• SportsDataIO NFL API - commercially_licensed_injuries,commercially_licensed_player_statistics,depth_charts,production_data_fallback
• Sportradar NFL API - commercial_provider_candidate,injuries_and_depth_charts,official_statistics_candidate

Draft-cost and expert evidence

Mock-draft ADP and published expert boards. Draft cost and expert consensus stay separate from player value and from projections.

• Fantasy Football Calculator - Public mock-draft ADP by format and team count.
• Captured expert boards - Published expert rankings captured with dates inside the draft-evidence dataset.
• Sleeper trending adds - Public trending-reads context for league-wide demand.

Free public data feeds

Documented free sources with attribution, access mode, product use and cache windows. Live connectivity is monitored separately.

• Sleeper - fantasy platform - public no key
• nflverse - open football data - public no key
• National Weather Service - weather - public no key
• Kalshi - prediction market - authorization required
• Polymarket - prediction market - public no key
• The Odds API - sportsbook aggregator - free key optional

Prediction markets

Team win-probability quotes with vig removed where both sides are quoted. Research context; never a ranking input.

• Polymarket - exchange
• Kalshi - exchange
• Robinhood - broker_router
• Approved prediction-market partners - exchange_or_aggregator

Press and news feeds

League and team press registries (1 league entries plus team feeds) for availability and injury context. A report is an attributed observation, never a model fact by itself.

• League and team press registry - Verified feeds with authority class and ingestion state; see the press-sources dataset for the full list.

What the sources feed

• Player value consensus - real-trade markets combined into one format-aware board, with every raw source kept visible.
• Weekly stat forecasts - published projections joined to observed box scores, scored by your league's rules.
• Value versus draft cost - where the trade market and the draft room disagree, both numbers named.
• Graded track record - every published board snapshotted before outcomes and graded after.

The fine print that never moves

• Missing data stays unavailable; it is never silently treated as zero.
• Draft numbers are likely and unlikely outcomes with the evidence shown - not guarantees.
• Research visibility never promotes a signal into public rankings by itself.
• Random variation is labeled as noise; patterns must survive backtests before they change a number.
• No provider write access, no account records in public data.