To cite package ‘ecb’ in publications use:

  Persson E (2025). _ecb: Programmatic Access to the European Central
  Bank's Data Portal_. R package version 0.4.3,
  <https://CRAN.R-project.org/package=ecb>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {ecb: Programmatic Access to the European Central Bank's Data Portal},
    author = {Eric Persson},
    year = {2025},
    note = {R package version 0.4.3},
    url = {https://CRAN.R-project.org/package=ecb},
  }