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Penny Army Reference Metadata Comparator
x402
Penny Army Reference Metadata Comparator is a paid API for AI agents from penny-army-reference-mainnet.spruceboundgranitestudio.workers.dev, paid per call via x402, $0.05/call, status down (last checked 2026-10-13).
Compares up to 10 DOI-bearing academic references against Crossref metadata, returning field-level agreements, discrepancies, and ambiguities for title, authors, and year.
Price / call$0.05
Success—
StatusDown
How this service works
Compare 1-10 DOI-bearing references against Crossref metadata: supplied title, ordered authors and/or year. Returns field agreements, discrepancies, ambiguities and provenance; does not verify scientific claims. 0.05 native USDC per completed batch on Base. Failed retrieval prevents settlement. Original-result recovery lasts 24 hours. Purchases require X-Penny-Mainnet-Key and an explicitly opened bounded window; sales are paused by default. Examples are saved fixtures.
Output
Returns a structured batch result containing per-reference comparisons: for each submitted reference, indicates whether the supplied title, author list (with family/given names), and year agree with or differ from the Crossref record for that DOI. Includes field-level agreement flags, discrepancy details, and ambiguity notes, along with provenance information about the Crossref data source.
Example use cases
Catching citation errors before journal submission
“Before I submit my paper, can you compare these 5 references against Crossref? DOI 10.1016/j.cell.2019.02.012 titled 'A Unified Theory of Aging' by Zhang et al. (2019), DOI 10.1038/s41586-020-2649-2 titled 'Array Programming with NumPy' by Harris et al. (2020), DOI 10.1126/science.aax9350 titled 'Climate sensitivity' by Sherwood et al. (2020), DOI 10.1093/nar/gkaa1074 titled 'UniProt 2021' by UniProt Consortium (2020), and DOI 10.1371/journal.pcbi.1007128 titled 'Ten simple rules' by Wilson et al. (2019) — flag any title, author, or year mismatches.”
Auditing auto-imported bibliography for accuracy
“My reference manager auto-imported 8 citations and I'm worried about metadata errors. Can you verify them against Crossref? The DOIs are 10.1103/PhysRevLett.116.061102 (listed as Abbott et al. 2016, 'Observation of Gravitational Waves'), 10.1007/s10955-016-1511-3 (Bertini et al. 2016, 'Exact solution'), 10.1088/1742-5468/2016/06/064002 (Essler et al. 2016, 'Quench dynamics'), 10.1103/PhysRevX.6.041065 (Kaufman et al. 2016, 'Quantum thermalization'), 10.1038/nature20168 (Zhang et al. 2016, 'Observation'), 10.1126/science.aad9480 (Barends et al. 2016, 'Digitized adiabatic'), 10.1103/PhysRevLett.117.210801 (Hinkley et al. 2016, 'Optical clock'), and 10.1038/nphys3783 (Labuhn et al. 2016, 'Tunable two-dimensional arrays') — tell me which fields agree or disagree.”
Verifying co-author order in collaborative manuscript
“My collaborators disagree about the correct author order for 2 references in our shared draft. Can you check DOI 10.1145/3290605.3300233 listed as 'Brown, A. and Smith, J. (2019)' with title 'Mixed Reality Interfaces', and DOI 10.1145/3313831.3376358 listed as 'Smith, J., Brown, A., and Lee, K. (2020)' with title 'Inclusive Design Patterns' — tell me if the author order and names match what Crossref has?”
Technical details
Endpoint
POSThttps://penny-army-reference-mainnet.spruceboundgranitestudio.workers.dev/v1/compare-reference-metadata?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need to programmatically verify bibliographic metadata accuracy for DOI-bearing academic references against the authoritative Crossref registry. It is ideal for pre-submission citation auditing, bulk reference validation in academic writing tools, and detecting metadata drift in imported bibliographies. Prefer this over manual Crossref lookups when processing 1-10 references in a single automated batch. Note: this endpoint validates bibliographic metadata only — it does not verify scientific claims, full-text availability, or retraction status.
Side effects
- DOI not found in Crossref — failed retrieval prevents batch settlement and payment
- DOI malformed or invalid format — request rejected before processing
- Batch exceeds 10 references — request rejected
- Reference missing required id or doi fields — validation error
- Crossref service unavailable — retrieval failure blocks completion
- Result recovery window expired (after 24 hours) — original results no longer accessible
- Missing X-Penny-Mainnet-Key header — payment/authentication failure
- Sales paused — service temporarily unavailable
- Reference missing at least one of title, authors, or year — schema validation error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| references | array |
Tags
x402
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