For Developers

78.0.0+85732.1673256 - 27/01/2026

Production Release - 07/02/2026

Service Changes

• Outsourced Liquidity Solutions Business - Post Trade [in progress]
• MarketAxess Muni Taker - Inquiry - MNPrice NC List [complete]
• MarketAxess Muni Taker - Inquiry - Yield NC List [in progress]
• MarketAxess US - RFQ - Support InquiryNegotiatedAwayFromTransficcApi [complete]
• E-Trading Platform Core Etrading - Support CAT Trades [in progress]
• E-Trading Platform Core Etrading - Support Bond Yield Trades [in progress]
• Jane Street - Taker Trading [in progress]

Library Changes

Inquiry Protocol

• Remove CounterpartyFirm.isUsPerson from QuoteRequestEvent. This has different meaning across venues, and is now present in venue specific information instead.
• Add isUSEntity to QuoteRequestEvent.eventLeg.venueSpecificInfo for Tradeweb IRS/DSWP/YSWP/EUCDS/USCDS
• Add isUSPerson to QuoteRequestEvent.eventLeg.venueSpecificInfo for Bloomberg IRS/CDS

Taker Inquiry Protocol

• Add NegotiationInformationAction, NegotiationInformationResponseEvent and NegotiationInformationActionFailureEvent
• Add PriceConfirmationAgreedEvent
• Add quoteCompetitiveStatus to CancelQuoteRequest.venueSpecificData
• Add PENDING_PRICE_CONFIRMATION to State

Post Trade Protocol

• Add rollConvention and restructuringType to TradeEvent.venueSpecificInfo

Clearing Protocol

• Add tradeExecutionTimestampNanos to AllegeTradeAction

eTrading Changes

On Demand Pricer Protocol

• Add YIELD to price-type enum
• Add customerPackagePrice to request-for-stream message

Historic Data Service Protocol

• Add YIELD to price-type enum

76.0.0+85028.7203673 – 05/01/2026
Production Release – 10/01/2026

Service Changes

* Tradeweb AUGV – Market Data [in progress]
* MarketAxess Muni – Inquiry – RFQ [complete]
* MarketAxess Muni Taker – Inquiry – Price NC List [in progress]
* MarketAxess Muni Taker – Inquiry – MNPrice BIN [in progress]
* MarketAxess Muni Taker – Post Trade [complete]
* Bloomberg US CDS – Post Trade [complete]
* Tullett EU Bonds – Post Trade – Credit [complete]
* E-Trading Platform Core Etrading – Remove IRS Dock [in progress]
* E-Trading Platform Core Etrading – Support Process Trades [complete]
* Outsourced Liquidity Solutions Business – GBP markup [complete]
* Outsourced Liquidity Solutions Business – Post Trade [in progress]
* Tradeweb EURP/IRS/DSWP/YSWP/UST/CDS – Remove changes around HitLiftSubjectEvent crosses with an action [complete]

Library Changes

* Add venue enum TRADEWEB_AUGV_MARKET_DATA

IOI Contribution Protocol

* Add IOIAction.venueSpecificData.marketaxessMinQuantity for MarketAxess Muni IOI Contributions

Inquiry Protocol

* Add QuoteRequestEvent.venueSpecificInfo.rfqMinDealerExceptionReason for Bloomberg CDS
* Add QuoteRequestEvent.venueSpecificInfo.maturityDate for Tradeweb IRS, DSWP, and YSWP

Taker Inquiry Protocol

* Add CancelListAction and CancelListActionFailureEvent
* Add NewQuoteRequestResponseEvent.newQuoteRequestVenueSpecificData.marketAxessTradingProtocol and DealerQuoteEvent.QuoteLeg.venueSpecificInfo.spotNegotiationModel for MarketAxess Muni Trading Taker

Post Trade Protocol

* Add contractualMatrixTerm, seniority, affirmationPlatform, interestAccrualDate, initialPaymentPayer, initialPaymentReceiver, restructuringType, and uniqueTradeIdNameSpace to TradeEvent.venueSpecificInfo for GBX CDS Post Trade

eTrading Changes

On Demand Pricer Protocol

* add venue field to request-for-stream.json
* add isProcessTrade field to request-for-stream.json

Historic Data Service Protocol

* add voiceTradeTimestampNanos field to inquiry-snapshot.json