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Fills Only Mode

For participants who only need fill notifications (not the complete order lifecycle), the drop copy session can be configured in “fills only” mode. When enabled:
  • Only ExecutionReport messages with ExecType = F (Trade) are sent
  • Order acknowledgements, cancellations, modifications, and rejections are not included
  • Reduces message volume for participants focused solely on trade reconciliation
To enable fills only mode, request this configuration when setting up your drop copy session with the exchange operator.

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Comparing FIX Drop Copy vs gRPC DropCopy

Polymarket Exchange offers drop copy feeds via both FIX and gRPC protocols:
FeatureFIX Drop CopygRPC DropCopy
ProtocolFIX 5.0 SP2gRPC streaming
Message FormatFIX tag-valueProtobuf
Session ManagementFIX logon/logoutgRPC connection
ReconnectionFIX resendResume tokens
Use CaseTraditional FIX integrationsModern API integrations
Choose FIX Drop Copy if you have existing FIX infrastructure. Choose gRPC if you prefer modern streaming APIs with protobuf messages.
For more information on gRPC DropCopy streaming, see the DropCopy Stream documentation.