Fact check, verify a claim: against live web sources

$0.01 per call · failed calls are never charged · no account or API key needed

Check a claim against the live web in one call: a Brave search, the top pages read, and a verdict from Llama 4 Scout using those sources only (supported, contradicted, mixed or unverified) with a short explanation, [n] citations and the sources. A model's reading of a few search results, not an editorial fact-check. Results are for immediate use only (Brave API terms). Use to screen a statement before an agent repeats or acts on it.

Buy credits by card (from $5) Example result (JSON)

Inputs

NameTypeDescription
claim (required)stringThe claim to check, at most 400 characters

Request

Over HTTP, with a card key from /credits:

curl -H "Authorization: Bearer adt_…" "https://agent-data-tools.revmesh2074.workers.dev/ai/fact-check?claim=The%20x402%20protocol%20uses%20the%20HTTP%20402%20Payment%20Required%20status%20code."

Without a key, the same URL answers 402 Payment Required with x402 and MPP terms, so an agent with a wallet pays per call in USDC (Base, Polygon, Arbitrum or Solana over x402; Base or Tempo over MPP) and retries.

Example result

{
  "claim": "The x402 protocol uses the HTTP 402 Payment Required status code.",
  "verdict": "supported",
  "explanation": "The protocol's own documentation describes servers answering 402 Payment Required with payment terms [1].",
  "sources": [
    {
      "n": 1,
      "title": "x402: an open payment protocol",
      "url": "https://www.x402.org/"
    }
  ],
  "model": "@cf/meta/llama-4-scout-17b-16e-instruct",
  "terms": "Results are for the caller's immediate use…"
}

From an AI agent (MCP)

Add the MCP server to Claude, Cursor or any MCP client. This tool is ai_fact_check, and the first 25 successful calls are free:

https://agent-data-tools.revmesh2074.workers.dev/mcp

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