Several APIs are available, where one can input unit ids or loop ids or chain ids and get back useful information.RNA APIs

Example 1
Watson-Crick-Franklin basepair from the spliceosome. Only the unique sequences will be shown.They are usually U*A but sometimes U*U
Visualize the coordinate at this link

Example 2
E. coli has GC basepair, other bacteria have AU or UA or CG
Visualize the coordinates at this link

Example 3
Hairpin loop from Helix 95 of archaeal LSU in fasta format
Visualize the cordinates at this link

Example 4
Eukaryotic internal loop with intercalated nucleotide
Visualize the coordinates at this link