FOR WRITERS, EDITORS & RESEARCH AGENTS

Check the claim.
See the evidence.

Before you publish a newsletter, article, or research note, check one factual statement and get a dated answer with source links you can inspect. $2 per Standard report. No subscription.

Verify a claim · $2 ↗ Read a free real sample ↗

API · MCP · A2A x402 · MPP USDC · USD

Start here / Standard report

One claim. A source-linked answer.

Enter a factual statement you want checked against current web evidence. $2 per report, paid securely with Stripe. No account required.

Inspect the free archived sample before paying ↗

Check public, factual statements. We may return uncertainty or insufficient evidence. This is a research aid; review sources before relying on a report. If a paid report cannot be delivered, contact contact@aisoup.net with your order or Checkout reference for help or a refund review.

Standard depth · Up to 8 cited sources · Stored snapshots where available. Reports can contain uncertainty or conflicting evidence.

01 / Output

One claim in.
A verifiable record out.

The result separates what the search provider surfaced, what the model cited, and what the service independently preserved.

Conclusion

A bounded verdict with conflicts and limitations, rather than a free-form answer.

Sources

Every provider-reported source, with citations mapped to individual evidence items.

Snapshots

Stored HTML, capture timestamps, and raw plus normalized SHA-256 hashes.

Receipt

A signed commercial record tying the request, payment, and delivered result together.

02 / Request

A small contract
for a hard problem.

Choose a research depth. Send one claim plus optional source, freshness, language, or jurisdiction constraints.

Read the complete OpenAPI specification ↗

POST /web-evidence/v1/claims/verify

curl -X POST \
  https://web-evidence.aisoup.net/api/v1/claims/verify \
  -H "Content-Type: application/json" \
  -d '{
    "claim": "The Base mainnet chain ID is 8453.",
    "sourcePolicy": "authoritative",
    "minimumSources": 2,
    "includeConflicts": true
  }'