This is worth a serious examination (and I realize it may have been all the pills on the interface that led me to that medical metaphor).
ticTOCs is a newly-reworked scholarly table of contents (TOCs) service that covers 11,416 (as of today) journals from 420 publishers. And if your personal/institutional subscriptions allow it, direct links to 295K articles.  The ticTOCs consortium is: the University of Liverpool Library (lead), Heriot-Watt University, CrossRef, ProQuest, Emerald, RefWorks, MIMAS, Cranfield University, Institute of Physics, SAGE Publishers, Inderscience Publishers, DOAJ (Directory of Open Access Journals), Open J-Gate, and Intute.
Have to search around when I have a bit more time to see if they’ve added an API. This could be a big help on our research portals project…