SAVERVerifier For agents
FACT-CHECKING API · AGENT RESEARCH

Your report’s numbers.
A second check.

Verify a material statistic, date or source attribution before it enters an agent’s report. Get a separate web-research assessment with evidence linked to cited sources.

Read the agent workflow Inspect the tool contract
0.20 USDC / completed checkBase · x402 v2No signup or API key
WHERE THE EXTRA CHECK MATTERS

The figure can be right.
The interpretation can be wrong.

Claim verification for research reports: check whether a cited source supports a factual claim, including its measurement, reporting period, population and scope. Use a separately cited assessment when these remain unresolved.

These are the same three stored, operator-funded, source-guided paid reports. Reading them is free and runs no verification. They are demonstrations, not an independent accuracy benchmark or customer reviews.

A CHECKPOINT BEFORE PUBLICATION

One claim in.
Sources with the assessment.

  1. 01

    Select the material claim.

    Keep the exact figure, year, unit and qualification. Add the original source URL and definitions in context when available.

  2. 02

    Authorize one bounded check.

    Send JSON to POST /v2/verify. A valid unsigned request returns 402. An authorized x402 v2 wallet signs and retries under its existing spending policy.

  3. 03

    Inspect the evidence.

    Resolve each source ID, read the cited findings and distinguish supported, contradicted, mixed and unresolved material.

  4. 04

    Keep the scope explicit.

    Save the assessment and receipt with the selected claim. One checked claim does not certify an entire report.

REQUEST FROM A STORED PAID REPORT
POST https://api.saververify.com/v2/verify
Content-Type: application/json

{
  "claim": "IRENA's Renewable Capacity Statistics 2024 shows that renewables generated 86% of global electricity in 2023.",
  "context": "An energy-sector briefing cites https://www.irena.org/News/pressreleases/2024/Mar/Record-Growth-in-Renewables-but-Progress-Needs-to-be-Equitable . Independently check the attributed statistic against the original publication, including the year, measured quantity and denominator."
}

Send only claim and optional context. Inspect the live payment challenge before signing. GET on the verification route returns 405.

Read the live OpenAPI contract
DECIDE WITH THE RIGHT SCOPE

Know what the check buys.

When does claim verification help?

SAVER performs a separate research pass and returns cited findings. That can be useful for a material claim whose interpretation remains uncertain. If your existing workflow has already resolved the source and scope, reuse that evidence when adequate.

What does source verification cover?

Here, source verification means assessing whether web evidence supports a factual claim and its attribution. Use specialist tools for DOI existence and retraction checks, arithmetic, wallet risk and transaction simulation. SAVER is a factual-claim assessment, not an execution approval or a whole-report certification.

What does a completed check cost?

0.20 USDC on Base through x402 v2. A valid insufficient_evidence assessment is also a completed paid result. Reading the stored examples and inspecting discovery is free.

What if a response is lost?

Save an optional recovery token before the first request. Retained settled results can be recovered for 24 hours without a new payment. Do not blindly sign another payment after an uncertain outcome.

READY FOR AN AUTHORIZED AGENT

Keep the claim.
Check its foundation.

Open the agent workflow Use the existing report adapter