ACROSS is developing modern Application Programming Interfaces (APIs) to NASA TDAMM relevant missions. APIs play a critical role in enabling the rapid coordination and responsiveness required for TDAMM astronomy. By providing standardized, machine-readable access to mission state, status, observing plans, and observational constraints, APIs allow automated systems to quickly assess which observatories are available, where they are pointing, and what constraints might affect follow-up observations. APIs for submitting target of opportunity (ToO) requests streamline the process of triggering rapid observations across facilities, reducing human latency and enabling timely data collection in response to transient events. 

ACROSS developed a set of python based toolkits to programmatically interface with the ACROSS developed APIs. These toolkits allow researchers to build custom workflows, automate decision-making, and integrate real-time data streams into their own analysis pipelines. The toolkits enable seamless access to the ACROSS mission dashboards, APIs, and ToO services, allowing users to query observatory status, evaluate follow-up feasibility, and trigger observations without manual intervention. 

ACROSS enables TDAMM astrophysics by centralizing access to critical resources, including information on TDAMM-relevant missions and their observational capabilities, maintaining an up-to-date calendar of past and upcoming conferences, and a list of funding opportunities relevant to TDAMM science.