Pendar

Walk the citation graph around a paper and assess its impact: who cited it, what it cited, and how those papers connect to each other. Returns whether citations are accelerating or declining (from the exact per-year history), which research fields the citing work comes from, which kinds of institution are citing (universities, industry, hospitals, government labs), and the authors citing it most. Use this to judge whether a paper is still influential, which fields picked it up, and who is building on it. Takes about a second.

Survey the published literature on a topic and return the shape of the field alongside the most relevant papers. Gives the exact number of papers that exist, how many were published each year and whether output is growing or fading, which sub-areas the work divides into, which disciplines and countries it comes from, the institutions publishing most of it and the journals or repositories it appears in, how much is peer-reviewed versus preprints or theses, and how many papers are retracted. Every count is exact over the whole corpus rather than estimated from a sample. Use it to size and characterise a research area, to judge whether a field is active before entering it, or to find papers on a subject. Pass a short noun phrase, not a question. Takes about two seconds.

Verify that a cited paper actually exists and return its canonical metadata, DOI, and retraction status. Accepts a DOI, a Pendar paper ID, a title, or a full citation string. When the input is too ambiguous to resolve, returns candidates instead of guessing. Takes about a second.