River Markets
YC X26 · Active · Prime brokerage for prediction markets
Competitors
| Company | Category | Status | Program |
|---|---|---|---|
 DomeShared: prediction market, unified apiInactiveDevtools | Devtools | Inactive | YCF25 |
 ValenceShared: prediction market, trader, aggregateActiveDevtools | Devtools | Active | YCW26 |
 OddpoolShared: prediction market, systemActiveDevtools | Devtools | Active | YCX26 |
 LettuceShared: order management, management systemNot statedDevtools | Devtools | Not stated | 500 Global2012 |
 KomboShared: unified api, systemActiveDevtools | Devtools | Active | YCS22 |
Adjacent
| Company | Category | Status | Program |
|---|---|---|---|
 BirkelandShared: prediction market, eventNot statedOther | Other | Not stated | EF2023 |
 TotalisShared: prediction marketActiveOther | Other | Active | YCX26 |
 SelfinShared: prediction market, eventActiveOther | Other | Active | YCF25 |
 Sequence MarketsShared: prediction market, trader, venueActiveOther | Other | Active | YCW26 |
 ValCtrlShared: prediction market, venue, contractActiveOther | Other | Active | YCX26 |
Also from X26 in Developer tools
All of X26| Company | Category | Status |
|---|---|---|
 Dreachstaffing firms with dreach grow revenue faster.ActiveDevtools | Devtools | Active |
 smol machinesShip software faster with portable, self contained virtual machines.ActiveDevtools | Devtools | Active |
Founders
- Oscar LevyFounder/CEO
- Antonin ParrotFounder/CTO
About 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.
- YC batch
- X26 · Spring 2026
- Status, per YC
- Active
- Category
- Developer tools
- Team size
- 2
- Location
- San Francisco, CA, USA
- Founded
- 2026
- Checked
- 1h ago
River Markets: questions
Which YC batch was River Markets in?
River Markets was in Y Combinator's Spring 2026 batch (X26).
Is River Markets still active?
Y Combinator lists River Markets as active.
Who founded River Markets?
River Markets's founders, as listed on its YC page: Oscar Levy (Founder/CEO), Antonin Parrot (Founder/CTO).
Where is River Markets based?
River Markets lists San Francisco, CA, USA as its location on YC's directory.
Sources: each program's public company list, read twice a week. Not affiliated with Y Combinator or any other program. Logos via logo.dev; trademarks belong to their owners.