Name: claim-corroborate
Price: 0.05 USDC
Availability: InStock

$ man claim-corroborate

agentutility / compose / claim-corroborate

PRICE / CALL

$0.05

USDC · base mainnet · scheme: exact

METHOD

POST

CLUSTER

compose

CATEGORY

uncategorized

STATUS

● live

NAME

claim-corroborate — fact check a claim and see exactly who agrees and who disagrees

SYNOPSIS

POST https://x402.agentutility.ai/claim-corroborate
     Content-Type: application/json
     X-PAYMENT:    <signed-transferWithAuthorization>

     { ... }

↳ first call → 402 Payment Required. Sign USDCtransferWithAuthorization, retry with theX-PAYMENT header.

DESCRIPTION

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.

INPUT — request schema

property	type	description	req?
claim	string	The factual claim to check, e.g. 'the Great Wall of China is visible from space'. Max 500 chars.	required
lang	string	Optional 2-8 character language code for the Wikipedia search leg, e.g. 'en' or 'es'. Default 'en'.	optional
max_sources	number	Max results pulled per corpus (web, Wikipedia, X, arXiv) before dedup. Default 5, range 1-10.	optional

OUTPUT — response shape

field	type	description
claim	string	—
corroboration	string	—
sources	string	—
sentiment	string	—
composed_of	string	—
components	string	—
degraded	string	—

EXAMPLES — two ways to call

EXAMPLE 1 · curl

curl -X POST https://x402.agentutility.ai/claim-corroborate \
  -H 'Content-Type: application/json' \
  -d '{ }'

first response = 402 Payment Required with payment requirements; sign + retry with X-PAYMENT.

EXAMPLE 2 · mcp

# Install the MCP package for this endpoint's cluster
npx -y @agentutility/mcp-<cluster>

# Required: EVM private key with USDC on Base
export X402_PRIVATE_KEY=0x...

# Then call the claim-corroborate tool from your MCP-aware agent.

MCP server handles payment automatically — your coding agent just calls the tool by name.

METADATA

tags: composeclaimcorroborateclaim-corroborate
methods: POST
cluster: compose
price: $0.05 USDC per call

ADJACENT — other endpoints in compose

endpoint	description	price
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company-dossier	Builds a company research dossier in one call: firmographic profile, domain intelligence, WHOIS registration, TLS, and tech stack.	$0.05
content-trust-check	Trust screen for a block of text in one call: is it AI-generated, is it safe (content moderation), and is it a near-duplicate of a refere…	$0.05
contract-terms-brief	Pull SLA terms, named entities, PII flags, and a plain-language summary out of a contract or policy document in one call.	$0.05
course-study-kit	Turn a course syllabus into a study kit in one call: a parsed outline, a sequenced reading/study plan, flashcards, and a bullet summary.	$0.05
cross-border-ops-brief	Cross-border operating brief for a country: the FX rate, country profile, visa requirements, upcoming public holidays, and current local…	$0.05
crypto-signal-scan	Structured, informational signal brief for a token or crypto topic: X/Twitter sentiment, recent web coverage, and (when a fiat quote curr…	$0.05
destination-arrival-pack	On-arrival brief for a city or airport: this is the arrival pack, destination brief, and local conditions check a travel agent pulls righ…	$0.05