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You can access the tools via the following links:
Betting API API - https://developer.betfair.com/visualisers/api-ng-sports-operations/
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Heartbeat API - https://developer.betfair.com//visualisers/api-ng-heartbeat-operations/
This visualiser is used by the API developers to allow quick experimentation with the API. As new features become available in API-NG, our aim is to extend the visualiser to support these new features to help with rapid adoption of the added functionality.
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