01 · Overview
What is Whalefax?
Whalefax reconstructs prediction-market trades into portfolio P&L, FIFO cost basis, tax-style records, trader histories and whale leaderboards across Polymarket, Kalshi and Robinhood Prediction Markets. Its accounting-oriented workflow includes losing positions and fees, but reconstructed records still depend on the source history available from each venue. Users should verify any exported tax treatment for their own jurisdiction.
02 · Best for
Who is Whalefax best for?
Best for
Prediction-market traders who need defensible P&L, FIFO cost basis, tax-style reporting or a reconstructed view of trader performance rather than headline win rates.
Not ideal for
Users looking for trade execution, automated copying or tools that forecast market outcomes.
Reconstructed records depend on available market and trade history, and users must verify tax treatment for their own jurisdiction.
03 · Access & execution
How do access and execution work?
04 · Data provenance
What supports the product's data?
05 · Sources & review
How was Whalefax reviewed?
Official product sources were checked for documented identity, scope, access, pricing and limitations. This is not a security audit, performance test or endorsement.