{"id":"75f013e7-eea4-4c89-baad-d4dd5ac12445","arxiv_id":"2507.13883","paper_version":1,"verdict":"CONDITIONAL","confidence":"MODERATE","novelty_score":4.0,"correctness_risk":"medium","formal_verification":"none","parameter_count":0,"one_line_summary":"A structured review of stablecoin research identifies 26 recurring research questions, synthesizes methods and data sources, and flags underexplored areas such as security, privacy, governance, and accounting treatment.","lead":"This paper is a systematic survey of 209 academic stablecoin studies, organized into 26 research questions spanning economics, technical design, and regulation. It maps what researchers have measured, which methods they used, and where the literature is still thin.","discovery_kind":"review","skeptic_critique":{"model":"deepseek-v4-flash","headline":"The central map of 26 research questions is built on an unvalidated, single-coder classification of 209 papers; the reported research gaps may be artifacts of that subjective coding.","rationale":"The reader's conditional verdict already identifies the search and coding assumptions as the weak point. My stress-test focuses on the coding step as the single most load-bearing element because the paper's novel deliverable is the 26-question taxonomy and the gap analysis built on per-question counts. Even a perfect search would not rescue the central claim if the classification of papers into questions is subjective and unrepeatable. The paper provides no evidence of coding reliability: no second coder, no agreement statistic, no codebook, and no release of the assignment of each of the 209 papers to its research question. The sum of the counts in Table II exactly equals 209, which suggests each paper was assigned to exactly one primary question, but multi-topic papers are common in this literature, so the single-label coding could materially distort the apparent gaps. The proposed inter-rater reliability test directly settles whether the taxonomy is a reproducible instrument. The reader's call for supplementary data, a full list of included studies, and a formal coding procedure is exactly right, and my concern does not move the verdict away from CONDITIONAL; it reinforces the condition. If the test passed, the map would be credible; if it failed, the gap claims would need substantial qualification. No fraud or misconduct is implied; the issue is missing methodological evidence for a subjective classification task.","tokens_in":45335,"tokens_out":3585,"duration_ms":48580,"concrete_test":"Have two independent coders, blind to the authors' assignments, code a random sample of 50 papers from the 209-document set using the Table II taxonomy and a written codebook derived from the paper's research-question definitions; compute Cohen's kappa. If kappa is below 0.6, the 26-question categorization is not reproducible, and the derived research-gap claims lack a reliable basis.","verdict_should_be":"UNCHANGED","load_bearing_attack":"The paper's central contribution is a taxonomy: 26 research questions organized into 10 sub-categories and 3 macro-categories (Table II), with each of the 209 papers assigned to exactly one question (the per-question counts sum to 209). Section III gives the Scopus query and filtering steps but provides no coding protocol, no codebook, no inter-rater reliability check, and no list of the individually included or excluded studies. The Google Scholar supplement is described only as 'integrated', with no search strings, inclusion criteria, or exclusion log. Consequently, the headline finding—that security/privacy, governance, failure analysis, and accounting treatment are 'significant research gaps'—rests entirely on the authors' private categorization decisions. If another researcher applying the same taxonomy to the same corpus would assign papers differently, the gap claims, and even the counts in Table II, change. The 'comprehensiveness' of the review is therefore not independently checkable as reported.","agreement_with_reader":"partial"},"referee_report":{"model":"deepseek-v4-flash","summary":"This paper presents a systematic literature review of stablecoin research. The authors query Scopus with a reported search string, supplement the results with Google Scholar searches and selected technical reports, and filter the corpus to 209 English-language documents. They identify 26 research questions, organize them into 10 sub-categories and 3 macro-categories (Economic Analysis, Technical Analysis, Position and Policy Papers), and assign each document to exactly one research question; Table II reports per-question counts that sum to 209. The body of the paper synthesizes findings, methodologies, and open questions under each research question, and the discussion identifies research gaps in areas such as security and privacy, governance, failure analysis, and accounting treatment. The paper also includes original data visualizations of stablecoin prices, market shares, and crisis episodes.","tokens_in":45572,"tokens_out":6624,"duration_ms":78612,"significance":"If the taxonomy and gap analysis are sound, the paper provides a useful map of a large and fragmented literature and a concrete agenda for future research. It is one of the most comprehensive stablecoin surveys to date in terms of corpus size, and it explicitly documents the search query, the filter steps, and the aggregate category counts. The authors also transparently position the paper as an extension of their earlier 111-paper survey, and they draw attention to several understudied topics that deserve further work. The main limitation is that the central contribution—the assignment of 209 documents to 26 research questions—rests on a single-coder categorization without a published codebook, inter-rater reliability check, or item-level audit trail; this makes the headline gap claims vulnerable to coding choices. The paper also contains several internal numeric inconsistencies between Table II and the prose. Neither issue is fatal, but both must be resolved for the survey to serve as a reliable reference.","major_comments":[{"comment":"The central categorization is not reproducible as reported. The manuscript gives the Scopus query and the aggregate exclusion counts, but it provides no codebook defining the 26 research questions, no documented decision rules for borderline papers, no inter-rater reliability assessment, and no list of which of the 209 documents are assigned to which research question. The Google Scholar integration is described only as \"integrated\" without search strings, inclusion criteria, or an exclusion log, and the 14 papers removed for \"not focusing significantly on Stablecoins\" are not enumerated. Because the headline research-gap claims (security and privacy, governance, failure analysis, accounting standards) are derived from the per-question counts in Table II, readers cannot independently verify the taxonomy or the counts. I recommend adding a supplementary appendix containing the full coding protocol, the list of included and excluded documents with their research-question assignments, and a flow diagram of the search and screening process; if a second coder is not feasible, a self-coding audit trail or a sensitivity analysis showing how plausible alternative assignments would affect the gap claims would substantively increase confidence.","section":"Section III, Table II"},{"comment":"Several per-question counts in Table II are inconsistent with the prose. For research question 4 (\"How do external crises impact stablecoins?\"), Table II lists 5 papers but Section IV.A.4 says \"The research question ... is addressed by four papers.\" For research question 5 (\"What are the economic, financial, and policy impacts of adopting stablecoins?\"), Table II lists 4 papers but Section IV.B twice refers to \"three papers.\" For research question 17 (\"What are the characteristics of stabilization mechanisms used in stablecoins?\"), Table II lists 14 papers but Section V.B states \"Fifteen papers analyze the stabilization mechanisms.\" In addition, Section VII.A says the first research question (price/volume correlation) is \"the focus of more than 30% of the papers analyzed in this study,\" yet Table II gives 37/209 ≈ 18% overall (or 37/111 ≈ 33% of the economic category, which is not what the sentence says). These mismatches directly undercut the paper's systematic, count-based claims and should be reconciled, with a complete citation list for each research question provided either in the text or in the supplementary material.","section":"Section IV.A.4, Section IV.B, Section V.B, Table II; Section VII.A"},{"comment":"The sampling strategy is not auditable enough to support the paper's comprehensiveness claim. The search stops in September 2024, excludes non-English and paywalled works, and the Google Scholar supplement is described only as \"searches ... to include novel contributions from peer-reviewed venues—not yet indexed on Scopus—and potentially other relevant documents from trusted sources, e.g., technical reports from the European Central Bank.\" No list is given of the documents added from Google Scholar, the search strings used, or the reasons for including or excluding particular items. As a result, the identified research gaps (e.g., the scarcity of work on security, privacy, governance, and accounting treatments) could be artifacts of the sampling scheme rather than properties of the literature. I ask that the authors provide a complete list of the Scopus-derived documents and the Google Scholar-derived documents, with their dates and venues, and a transparent account of any inclusion/exclusion decisions beyond the stated language and paywall filters.","section":"Section III (Methodology)"}],"minor_comments":[{"comment":"Several figure captions and surrounding text contain garbled placeholder strings (e.g., sequences of \"/uni00000013/...\") that appear to be rendering artifacts; these should be removed or regenerated before publication.","section":"Figures throughout"},{"comment":"There is a typo in the discussion of ref. [9]: \"stabecloin-related literature\" should read \"stablecoin-related literature.\" The text also repeatedly renders \"Silicon Valley\" as \"Silicon V alley\" (e.g., in Fig. 4 and Section IV.A.4), which should be corrected in a proofreading pass.","section":"Section II (Related Work)"},{"comment":"The Scopus query as printed, with \"LOAD-DATE < 20240917\" and the formatting of the LIMIT-TO clauses, should be double-checked against Scopus's current search syntax; if LOAD-DATE is not a valid field, the query will not reproduce the reported results.","section":"Section III (Methodology)"},{"comment":"The sentence \"only two papers analyze security concerns related to stablecoins\" should be clarified: according to Table II, the Security and Privacy sub-category contains four papers across three research questions (privacy, security threats, and market manipulation), so the statement should specify which questions count as \"security concerns\" and which do not.","section":"Section VII.A (Research Trends)"}],"recommendation":"major_revision","confidential_remarks":"The paper's central claim is a reproducible taxonomy of the stablecoin literature, but the methodology as reported does not currently provide enough transparency to make that taxonomy independently checkable. Given that the authors have already published a related 111-paper survey, the incremental contribution here is real but depends on the credibility of the 26-question coding. With a supplementary codebook, item-level assignments, and reconciliation of the count inconsistencies, the paper could be a valuable reference; without those additions, the gap analysis rests on assertions. I would not recommend rejection because the issues are fixable within the manuscript's scope."},"author_rebuttal":null,"desk_editor":{"model":"deepseek-v4-flash","letter":"The paper is worth a serious look. It does something genuinely useful: it takes a fragmented literature and gives it a structured map, expanding the authors' earlier survey from 111 to 209 papers and from 13 to 26 research questions, with a new policy category. The organization by research question is practical, the search strategy and filtering steps are transparent, and the authors do a fair job of summarizing conflicting findings—their discussion of the Tether/Bitcoin manipulation debate is balanced and methodologically aware. The figures are a nice addition, and the per-question counts at least give readers a sense of where the field has concentrated.\n\nThe soft spot is real, and it is the load-bearing one. The entire taxonomy is a single-coder exercise: no codebook, no inter-rater reliability check, no list of the 209 included or excluded studies, and the Google Scholar supplement is described only as 'integrated.' That means the headline claims—that security/privacy, governance, failure analysis, and accounting treatment are significant research gaps—rest entirely on the authors' private categorization decisions. Another researcher applying the same scheme could plausibly assign papers differently, and the counts in Table II would shift. The comprehensiveness claim is therefore not independently verifiable as reported. The search restriction to English and Scopus plus informal supplements also tempers the word 'comprehensive.' These are fixable problems, not fatal ones: a supplementary file with the full list of papers, a description of the coding protocol, and ideally a second coder or a sensitivity analysis would turn this from a plausible map into a reliable reference.\n\nI don't see problems with the math or data—there is no derivational claim to check, and the internal consistency of the counts is good. The self-citation is disclosed and the current work genuinely extends the earlier one, so that is not a concern.\n\nWho is this for? Researchers new to stablecoin literature, policymakers wanting a quick landscape, and anyone looking for an entry point to specific research questions. It deserves a serious referee, but the referee should push on the reproducibility of the coding. I would not desk-reject it; I would send it back with a request for the supplementary materials that make the taxonomy checkable.","headline":"A useful organizing map of stablecoin research, but its headline gap claims rest on a single-coder taxonomy that isn't independently checkable as reported.","tokens_in":45978,"tokens_out":1536,"would_cite":true,"duration_ms":20823,"reading_group":"maybe","serious_thinker":"yes","would_accept_peer_review":true},"rs_alignment":null,"lean_confirmation":null,"pith_extraction":{"msc":[],"pacs":[],"model":"deepseek-v4-flash","headline":"A systematic review of 209 stablecoin papers organizes the field into 26 research questions and exposes its gaps.","keywords":["stablecoin","systematic literature review","research taxonomy","cryptocurrency","central bank digital currency","Decentralized Finance (DeFi)","research gaps","regulatory challenges"],"falsifier":"Have two independent raters code the same 209 documents with the paper's taxonomy and measure inter-rater agreement, or re-run the search on a second database (e.g., Web of Science) and count how many additional stablecoin papers do not fit any of the 26 questions. Low agreement or many non-fitting papers would show that the taxonomy and gap list are not stable features of the literature.","tokens_in":45087,"feed_emoji":"📊","tokens_out":4666,"duration_ms":54565,"temperature":0.7,"pith_summary":"This paper claims that stablecoin research, though growing fast, is fragmented and that a systematic review can fix that. Analyzing 209 Scopus-indexed documents, the authors identify 26 research questions spanning economic, technical, and policy dimensions. The resulting map shows where the field is crowded—price correlation and stability studies dominate—and where it is nearly empty, notably security, privacy, governance, failure analysis, and accounting treatment. The paper matters because a reliable map lets researchers and policymakers see what is known, what is contested, and what remains unstudied.","feed_headline":"26 questions map stablecoin research and expose the gaps","feed_subtitle":"A 209-paper systematic review shows what stablecoin science knows and what it leaves unstudied.","key_machinery":"The carrying mechanism is a hand-built classification scheme. A Scopus query for 'stablecoin*' or 'stable coin*' in titles, abstracts, and keywords, restricted to English articles, proceedings, and reviews and cut off in September 2024, yielded 236 documents; after removing paywalled, non-English, and off-topic items, 209 papers were coded into 26 research questions. The taxonomy does the argument's work: it converts a scattered literature into comparable slots, exposes overcrowded and empty slots, and supports per-question summaries of findings, methodologies, and data sources.","core_discovery":"The central claim is that the stablecoin literature can be organized into 26 research questions grouped into three macro-categories, and that this organization reveals a lopsided field. Price and volume correlation studies account for the largest share of papers, while privacy (one paper), security, governance, and failure analysis are severely underrepresented. The review also surfaces conflicting results—such as whether Tether issuance moves Bitcoin prices—and traces the disagreements to differences in data granularity and model choice. It presents itself as the first systematic review that covers economic, technical, and regulatory research in one framework.","pith_inferences":["A natural extension the authors do not pursue is a comparative autopsy of the listed but unstudied failed stablecoins (Basis Cash, NuBits, BeanStalk, Acala USD), which could turn failure analysis from two cases into a proper taxonomy.","The review's September 2024 cutoff means its gap list will age quickly; the same coding scheme could be maintained as a living index.","The paper observes that over 99% of stablecoins are USD-pegged; a testable policy-adjacent inference is that US regulatory choices about stablecoin reserves and issuance will effectively determine whether dollarization spreads in smaller economies.","Given that only one paper studies privacy, one could test whether stablecoin privacy features systematically affect adoption; the review's data sources do not yet support this."],"forward_implications":["Future researchers get a ready-made list of underexplored topics, including stablecoin security, privacy, governance, non-Terra failures, and accounting standards.","New empirical work on stablecoin prices should take the documented non-linearity, regime-switching, and heavy tails into account rather than defaulting to VAR or GARCH models.","The identified data-source gap points to high-frequency and on-chain transaction data as the main unmet data need.","The taxonomy can serve as an updating scheme: new papers can be slotted into the 26 questions as the literature grows.","Conflicting findings in the literature are attributed to methodology and data differences, which sets an agenda for replication studies."],"supporting_citations":[{"why":"The 22-study empirical review that this paper defines itself against and extends.","marker":"[7]"},{"why":"The survey of stabilization mechanisms and payment applicability whose narrower scope motivates the broader taxonomy.","marker":"[8]"},{"why":"The economic-only survey whose general research directions this paper expands into 26 concrete questions.","marker":"[14]"},{"why":"The authors' earlier 111-paper survey with 13 research questions that this 209-paper study extends.","marker":"[15]"}],"fun_headline_variants":["Stablecoin review finds research skewed to price, ignoring security","209-paper survey reveals stablecoin research blind spots","26 questions chart stablecoin studies, exposing missing areas","Stablecoin literature lopsided: security and privacy ignored","Systematic review: stablecoin research has major gaps"],"cache_read_input_tokens":3200,"weakest_assumption_plain":"The map's validity rests on the sample: if the Scopus query plus Google Scholar additions missed large parts of relevant work, or if the authors' hand-coding into 26 questions is not reproducible, the described gaps could be artifacts of sampling and subjective categorization rather than real properties of the field.","fun_headline_variants_meta":{"raw":{"variants":["Stablecoin review finds research skewed to price, ignoring security","209-paper survey reveals stablecoin research blind spots","26 questions chart stablecoin studies, exposing missing areas","Stablecoin literature lopsided: security and privacy ignored","Systematic review: stablecoin research has major gaps"]},"model":"deepseek-v4-flash","effort":"low","cost_usd":0.000219,"raw_usage":{"total_tokens":1418,"prompt_tokens":896,"completion_tokens":522,"prompt_tokens_details":{"cached_tokens":384},"prompt_cache_hit_tokens":384,"prompt_cache_miss_tokens":512,"completion_tokens_details":{"reasoning_tokens":442}},"tokens_in":512,"tokens_out":522,"duration_ms":6615,"temperature":1.0,"reasoning_tokens":442,"cache_read_input_tokens":384,"cache_creation_input_tokens":0},"cache_creation_input_tokens":0},"created_at":"2026-08-06T16:13:48.712564+00:00","model_set":{"reader":"deepseek-v4-flash"},"falsifier":"Have two independent raters code the same 209 documents with the paper's taxonomy and measure inter-rater agreement, or re-run the search on a second database (e.g., Web of Science) and count how many additional stablecoin papers do not fit any of the 26 questions. Low agreement or many non-fitting papers would show that the taxonomy and gap list are not stable features of the literature.","supporting_citations":[],"review_version":1}