{"uid":"cap_DFr2jUCd4EvHi6VQWbs7q","slug":"citation-verifier-doi-arxiv-isbn-f6b5aa6c","name":"Citation Verifier (DOI, arXiv, ISBN)","description":"Checks up to 5 references against public registries: DOI through Crossref, arXiv ids through the arXiv API, ISBN-10/13 through Open Library (checksum first). Returns title, year, venue and a BibTeX entry plus an APA-style string for each verified one; unknown ones come back as not_found. Authors are given for DOI and arXiv only.","url":"https://api.fadeandco.workers.dev/api/agent-intel/citation-verifier?utm_source=zero.xyz","method":"POST","headers":{},"bodySchema":{"type":"object","properties":{"references":{"type":"array","items":{"type":"string"},"description":"1 to 5 DOIs, arXiv ids (arXiv:1706.03762) or ISBNs"}}},"responseSchema":{"type":"json","example":{"source":"Crossref, arXiv, Open Library","results":[{"id":"10.1038/nature14539","apa":"LeCun, Bengio, Hinton (2015). Deep learning. Nature, 521, 436-444. https://doi.org/10.1038/nature14539","type":"doi","year":2015,"input":"10.1038/nature14539","title":"Deep learning","venue":"Nature","bibtex":"@article{lecun2015,\n  title = {Deep learning},\n  author = {Yann LeCun and Yoshua Bengio and Geoffrey Hinton},\n  journal = {Nature},\n  year = {2015},\n  volume = {521},\n  pages = {436-444},\n  doi = {10.1038/nature14539}\n}","source":"https://api.crossref.org/works","status":"verified","authors":["Yann LeCun","Yoshua Bengio"],"publisher":"Springer Science and Business Media LLC"},{"id":"1706.03762","apa":"Vaswani, Shazeer, Parmar, Uszkoreit, Jones, Gomez, Kaiser, Polosukhin (2017). Attention Is All You Need [Preprint]. arXiv. https://arxiv.org/abs/1706.03762","type":"arxiv","year":2017,"input":"arXiv:1706.03762","title":"Attention Is All You Need","venue":"arXiv","bibtex":"@misc{vaswani2017,\n  title = {Attention Is All You Need},\n  author = {Ashish Vaswani and Noam Shazeer and Niki Parmar and Jakob Uszkoreit and Llion Jones and Aidan N. Gomez and Lukasz Kaiser and Illia Polosukhin},\n  year = {2017},\n  eprint = {1706.03762},\n  archivePrefix = {arXiv}\n}","source":"https://export.arxiv.org/api/query","status":"verified","authors":["Ashish Vaswani","Noam Shazeer"]}],"checkedAt":"2026-10-23T09:35:17.408Z"}},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.002","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"probe","requiresHandshake":false,"reviewCount":0,"rating":{"score":"0.00","successRate":"0.00","reviews":0,"stars":null,"state":"unrated"},"availabilityStatus":"unknown","priceObserved":null,"sessionDeposit":null,"pricing":{"kind":"static","summary":"$0.002/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.002","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.002","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_sVOJTQVw7UyDbF6nRiDwR","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.002","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Verifies up to 5 academic references (DOIs, arXiv IDs, or ISBNs) against public registries and returns BibTeX entries, APA citations, title, year, venue, and authors for each.","exampleAgentPrompt":"Can you verify these three references and give me BibTeX and APA citations for each: 10.1038/nature14539, arXiv:1706.03762, and ISBN 9780262035613?","exampleUseCases":[{"title":"Bibliography check before paper submission","prompt":"I'm about to submit my paper — can you verify these DOIs are real and give me properly formatted BibTeX entries for all of them: 10.1145/3292500.3330919, 10.1038/s41586-021-03819-2, and 10.1126/science.aar3284?"},{"title":"Cite an arXiv preprint in APA format","prompt":"I need an APA citation and BibTeX entry for the Attention Is All You Need paper — the arXiv ID is arXiv:1706.03762."},{"title":"Validate ISBNs for a reading list","prompt":"Can you check whether these ISBNs are valid books and get me their titles and years: 9780262035613 and 9780374533557?"}],"resultDescription":"A JSON object with a results array where each entry includes the original input ID, its type (doi/arxiv/isbn), verification status (verified or not_found), title, year, venue/journal, authors (for DOI and arXiv), publisher, a formatted APA citation string, a BibTeX entry, and the source registry URL used. Also includes a checkedAt timestamp.","failureModes":["Reference not found in public registry — returned as status: not_found","Invalid ISBN checksum — rejected before lookup","Malformed DOI or arXiv ID format — may return not_found or error","More than 5 references submitted — request rejected","Upstream registry (Crossref, arXiv, Open Library) unavailable — may cause partial or failed response","Rate limits from upstream public APIs may cause transient failures"],"whenToPreferThis":"Choose this endpoint when you need to validate or format citations for DOIs, arXiv IDs, or ISBNs in batch (up to 5 at once) and want both BibTeX and APA output in a single call. It is ideal for academic writing assistants, bibliography validators, and research agents that need to confirm references are real before citing them. Prefer this over general-purpose web search when you have structured identifiers and need structured citation output from authoritative registries.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-29T00:34:09.217Z","isFirstParty":false,"canonicalSlug":"citation-verifier-doi-arxiv-isbn-f6b5aa6c"}