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Factstamp Bulk Verification
x402
Factstamp Bulk Verification is a paid API for AI agents from agents.factstamp.dev, paid per call via x402, $0.12/call, status unknown (last checked 2026-10-21).
Batch-verifies up to 12 items (citations, packages, entities) in a single API call at $0.01 per item, returning consistent verdicts from the same underlying verification engine.
Price / call$0.12
Success—
StatusUnknown
How this service works
A whole bibliography or dependency manifest in one round trip, at the point of relying on the list: up to 12 items at a flat US$0.12 — 1 cent an item, against 2 cents for the same lookups one at a time. Every item is answered by the same door that answers a single call, so the verdicts cannot disagree. A list, not prose: a whole document belongs to /document. Pay per call here, or redeem a prepaid pack code (one answer-pack credit per three items, up to 25 items on that rail).
Output
A structured list of per-item verdicts covering validity, status (e.g. verified, stale, retracted, flagged), and relevant metadata for each submitted item — all answered by the same verification engine for consistency across the batch.
Example use cases
Academic bibliography pre-submission check
“I'm about to submit my research paper — can you run a bulk verification on all 12 citations in my reference list and flag any that are retracted, stale, or invalid?”
Software dependency manifest audit
“Before we deploy, can you batch-check all the package versions in our requirements.txt and tell me which ones have known issues or are outdated?”
Compliance screening of multiple entities
“I have a list of 8 company names and need to verify their registrations and screen them against sanctions lists in one go — can you do that?”
Technical details
Endpoint
POSThttps://agents.factstamp.dev/bulk?utm_source=zero.xyzWhen to prefer
Use this endpoint when you have 2–12 items to verify and want consistent, cost-efficient verdicts in a single round trip ($0.01/item vs $0.02/item for individual calls). Prefer it over the single-item endpoints when verifying a whole bibliography, dependency manifest, or entity list. Use the /document endpoint instead if you have unstructured prose text with embedded claims. Use the subscription/monitoring endpoint if you need ongoing re-checks rather than a one-time verification.
Side effects
- More than 12 items submitted (exceeds flat-rate limit)
- Invalid item format (unrecognized DOI, arXiv ID, or package name)
- Payment failure or invalid prepaid pack code
- Mixed item types that cannot all be resolved in one batch
- Rate limiting or service unavailability returning 402 or 5xx
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| outputrequired | object |
Tags
x402
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