https://forum.developer.betfair.com/ Discussion about the Betfair Exchange historical data service offered via https://historicdata.betfair.com en Fri, 04 Sep 2026 09:08:03 GMT vBulletin 60 https://forum.developer.betfair.com/images/misc/rss.png https://forum.developer.betfair.com/ https://forum.developer.betfair.com/forum/developer-program/historical-data/42979-best_avail_back_sched_off-best_avail_lay_sched_off-diescrepency Fri, 28 Aug 2026 04:21:30 GMT I have downloaded the AU+NZ historical files and find there are over 800 records with the lay price less than the back price. Has anyone else come...
Thank you]]> Historical Data billborric https://forum.developer.betfair.com/forum/developer-program/historical-data/42979-best_avail_back_sched_off-best_avail_lay_sched_off-diescrepency https://forum.developer.betfair.com/forum/developer-program/historical-data/42949-new-field-betdelaymodels-added-to-historical-data-files-from-17th-august-2026 Thu, 20 Aug 2026 09:29:12 GMT The new field betDelayModels will be available in the Betfair Historical Data service market files after the date 17/08/26 Please note that... The new field betDelayModels will be available in the Betfair Historical Data service market files after the date 17/08/26

Please note that following field will be available on all messages where publish time is greater than or equal to 17/08/26 10:00 BST

Also note that files for markets that span across the point 17/08/26, 10:00 BST will contain market definition messages without this new field up until 17th of August 2026 10:00 BST and with the new field after17th of August 2026 10:00 BST

• "betDelayModels": [] or absence of this field, indicates - Only traditional model of bet delay enabled
• "betDelayModels": [PASSIVE] - Passive Delay enabled for the market
• "betDelayModels": [DYNAMIC] - Dynamic Delay enabled for the market
• "betDelayModels": [PASSIVE,DYNAMIC] - Both Passive and Dynamic delays enabled for the market

Please see the latest Betfair Historical Data feed specification document attached.

Kind Regards

Betfair Developer Program]]> Historical Data Betfair Developer Program https://forum.developer.betfair.com/forum/developer-program/historical-data/42949-new-field-betdelaymodels-added-to-historical-data-files-from-17th-august-2026