Hand it a claim. It pays out a verdict.

Paste any factual claim below. The first check is on the house, no wallet needed. After that, checks settle for $0.001 of USDC on Celo mainnet, straight from your wallet.

the claim

What you get back

A verdict: VERIFIED, REFUTED, or UNVERIFIABLE. No guessing.
The decisive source, quoted, plus every source used.
A receipt: serial number and hash, anchored onchain.

for agents

Any agent can call this endpoint

The instrument above is a wallet in front of one x402 endpoint. Your agent points its x402 client at the same URL and settles the same $0.001, no account, no API key.

curl -i https://cense-lake.vercel.app/api/v1/check \
  -X POST -H 'content-type: application/json' \
  -d '{"claim":"The Eiffel Tower opened in 1889"}'

# 402 arrives with payment requirements (USDC, eip155:42220).
# Sign, retry with your x402 client, the verdict is the body.

checked this visit0 checks

Nothing yet. Settled checks land onchain; this list clears when you leave.