Mergent FISD (Fixed Income Securities Database) is a U.S. Bond database covering more than 140,000 securities with over 550 data items. Data includes issuer-specific, issue-specific, and transaction information. Further information can be found on the WRDS website (see links below).
Mergent FISD data is accessible through query pages on the WRDS website, and as SAS datasets in the WRDS cloud, wrds.wharton.upenn.edu.