YC Spring 2026 (P26) founder

Antonin Parrot

Founder of River Markets, Prime brokerage for prediction markets

River Marketsfintech1 public signals

Company

Antonin Parrot is listed as a founder of River Markets. River Markets is the prime brokerage for prediction markets. We aggregate every major event-contract venue into one account, giving professional traders best execution, portfolio and order management systems, and a unified API.

Founder traction evidence

Public posts and activity attributed directly to this founder.

  1. LinkedIn

    Antonin Parrot LinkedIn post about River Markets

    Referral fee for first founding engineer Founder says River Markets is YC P26 and is hiring a founding engineer. Post describes the company as prime brokerage infrastructure for prediction markets. Public LinkedIn page shows 79 reactions and 11 comments.