Current Position
Gaku Saito is Co-CEO and a representative director of pafin, a Tokyo-based company providing cryptocurrency portfolio and transaction tools. Its current company page names Saito alongside fellow Co-CEO Amin Azmoudeh. Japan is recorded as the professional operating market of the Tokyo team, not as a statement about Saito’s nationality or residence.
Background & Biography
Saito’s WebX 2025 biography describes twelve years at Goldman Sachs, including portfolio management in proprietary investing and a company-operated hedge fund. The same historical biography identifies his involvement with the Japan Cryptoasset Business Association’s taxation working group. That event-era committee title is not presented as a separately verified current appointment.
Notable Contributions
pafin operates cryptact, which calculates cryptocurrency gains and losses, and defitact, which helps users view and analyze decentralized-finance transactions. In July 2026 the company announced the completed acquisition of competing calculation service Gtax and a planned October integration under the cryptact brand. This profile records the announcement, not an independently verified completion of the subsequent migration. These are collective company developments rather than achievements credited to Saito alone.
Why Katharos.ai Is Following Them
Katharos.ai follows Saito because transaction accounting is an important practical layer of digital-asset infrastructure. Tools that organize fragmented records can affect how individuals, professional advisers and businesses understand their activity. His investment-management background provides context for this operational focus without establishing that a product’s calculations are correct in every case.
Areas to Follow
Areas to follow include transaction-data coverage, reconciliation, user migration and the handling of decentralized-finance activity. Katharos.ai will distinguish announced capabilities from independently documented outcomes and avoid treating a calculation tool as a substitute for applicable professional advice. Updates to product documentation and clearly attributed company statements will guide coverage.
Reporting Scope
This profile covers public professional activity and company disclosures. It makes no claim about personal citizenship or private residence. Source attribution is not an endorsement, investment recommendation or Katharos.ai guarantee of every source’s authenticity. Current company leadership and the Tokyo operating base were checked on 21 October 2026.
Sources for Further Reading
WebX 2025: Gaku Saito biography and portrait — https://2025.webx-asia.com/tokyo/speaker/295
pafin: Company and leadership — https://www.pafin.com/en
pafin: Gtax acquisition announcement, July 2026 — https://www.pafin.com/en/news/cryptact-gtax-integration-en