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Re:Ask HN : Is there a free API or database for academic pub... by dozzie on Wednesday August 16, 2017 @03:09PM (#15030226)
This API is free, though somewhat incomplete:

  int publish(const char *document, size_t doc_size, const char *type);
  int obtain(char **document, size_t *doc_size, const char *doc_id);
HTH.