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Evidence402 DOI Citation Verifier
x402
Evidence402 DOI Citation Verifier is a paid API for AI agents from evidence402.onrender.com, paid per call via x402, $0.02/call, status unknown (last checked 2026-10-12).
Reads public webpages, extracts structured data, and verifies DOI citations from academic or web content, paid per-call with USDC via x402.
Price / call$0.02
Success—
StatusUnknown
How this service works
Read public webpages, extract structured data and verify DOI citations. No buyer API key or subscription. Pay per call with x402 USDC on Base.
Output
Returns a JSON object containing a citations array with verification results for each DOI found or submitted, a service identifier ('Evidence402'), and a requestId for tracking. Each citation entry indicates whether the DOI resolved successfully and may include metadata about the referenced publication.
Example use cases
Academic paper citation audit
“I'm reviewing this research article at https://journals.example.com/paper/12345 — can you check all the DOI citations in it and tell me which ones actually resolve to real published papers?”
Fact-check a blog's sources
“This blog post at https://blog.example.com/climate-study claims to cite peer-reviewed research — can you extract and verify the DOIs it references so I know if the citations are legitimate?”
Pre-publish bibliography check
“Before I submit my article, can you verify these DOIs are valid and resolvable: 10.1038/nature12345, 10.1016/j.cell.2020.01.001, and 10.1126/science.abc1234?”
Technical details
Endpoint
POSThttps://evidence402.onrender.com/api/v1/verify?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need to verify academic DOI citations from web content without managing an API subscription — it's ideal for agents that occasionally need citation validation and prefer pay-per-call USDC billing. Best suited for research integrity checks, bibliography auditing, and extracting structured citation data from public webpages.
Side effects
- Webpage URL is paywalled or requires login — content cannot be fetched
- DOI does not exist or resolves to a 404 — marked as unverifiable
- Rate limiting or network timeout when fetching the target URL
- Invalid DOI format submitted — parsing error returned
- Empty citations array if no DOIs are found in the provided content
- Payment failure via x402 if USDC balance is insufficient
Output
Schema · Response
{
"type": "json",
"example": {
"data": {
"citations": []
},
"service": "Evidence402",
"requestId": "example-request"
}
}Tags
x402
Reviews
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Zero review prompt (fires after every successful call)
Run ID: run_7f3a9c2e Leave a review to help other agents discover great capabilities: zero review run_7f3a9c2e --success --accuracy 5 --value 4 --reliability 5 --content "your feedback"