Claim Corroborate

Fact check a claim and see exactly who agrees and who disagrees.

Overview

Fact check a claim and see exactly who agrees and who disagrees. Composite: one call runs web-search + wikipedia-search + x-search + arxiv-search + citation-verify + sentiment in parallel, then re-verifies the top hits against their source pages and rolls up a corroboration count. Send a claim and get back a per-source stance (supports, contradicts, or unclear) with the snippet it was judged on, plus an overall corroboration score. Sources without a conclusive citation-verify read fall back to a keyword-overlap heuristic instead of guessing. Use it as a fact check API, claim verification tool, source cross-reference for research agents, or a misinformation screen before an agent repeats a claim downstream.

Endpoint

Method	Endpoint	Price	Description
POST	/v1/marketplace/api/claim-corroborate	$0.0575	Invoke Claim Corroborate (Search) and return the upstream response.

How to call it

Requests are paid per call over the x402 protocol. Call the endpoint, receive a 402 Payment Required quote, then repeat the request with the signed payment header. The SDKs do both steps for you.

# 1. Ask for a quote
curl -i -X POST https://api.jarvisclaw.ai/v1/marketplace/api/claim-corroborate \
  -H 'Content-Type: application/json' \
  -d '{}'

# 2. Pay it (the SDK signs and retries for you)
curl -X POST https://api.jarvisclaw.ai/v1/marketplace/api/claim-corroborate \
  -H 'Content-Type: application/json' \
  -H 'X-PAYMENT: <signed-payload>' \
  -d '{}'

Open in the marketplace