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Polymarket Institutional supports block trades for entities that qualify as Eligible Contract Participants (ECPs). Block trades are negotiated off-platform, then booked and confirmed by the Polymarket team. Trades settle and clear on the exchange. Every block must be at least 100,000 contracts. Prices are quoted in cents from 0.5¢ to 99.5¢, in half-cent ticks.
Only approved ECPs can be party to a block trade. Complete onboarding before trading.

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Onboard for Block Trading

Every entity that will transact completes the institutional application. That includes both counterparties to a block. See Onboarding for the full application, including the documents to prepare. For block trading:
  • Introducing brokers select Introducing Broker as the participant type. They complete a shorter application and upload only the IB Participation Agreement - Block Trades.
  • Counterparties select the participant type that describes their business, such as Market Maker, Hedge Fund, or FCM. They complete the standard application.
  • ECP status is required. During review, the onboarding team confirms that the entity qualifies as an ECP.
After approval, the Polymarket Institutional team coordinates a test trade with you.

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Book a Block Trade

1

Negotiate off-platform

The two counterparties agree the trade directly, or an introducing broker arranges it on behalf of its clients.
2

Confirm both parties are onboarded

Both counterparties must be approved exchange participants. If either is not, they must onboard first.
3

Send the trade to your Polymarket contact

Contact your Polymarket representative or blocks@polymarket.com with the agreed terms:
  • Both counterparties (Party A and Party B) and the side each one takes. One party buys and the other sells.
  • The market and outcome
  • The size, at least 100,000 contracts
  • The price, from 0.5¢ to 99.5¢ in half-cent ticks
If the market you need isn’t listed yet, ask your Polymarket representative to list it.
4

Polymarket books and confirms the trade

The Polymarket team confirms the terms with both counterparties and books the trade to the exchange.

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After the Trade Books

  • Settlement and clearing occur on the exchange.
  • An end-of-day report is generated for each participant that had a block trade.

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Glossary

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Contacts