Address check

POST /v1/check/quick answers "is this address safe to pay?" Use it before sending money to a wallet or a contract. Under half a second; $0.01 over x402.

The request

The same fields as the token check, without amount_usd: chain, address, and optionally context.

What is checked

• SanctionsThe US sanctions list (OFAC), refreshed daily, and the Chainalysis sanctions oracle.
• Scam labelsAddresses known as scams, drainers, phishing or exploiters.
• Sweeper walletsA wallet that has handed its code to a known sweeper contract (EIP-7702): anything sent to it goes straight to a thief.
• Address poisoningA look-alike wallet planted to be mistaken for an address you have dealt with: the same first and last characters, put into your history with fake "USDC" or "USDT" transfers or transfers of nothing, so that you copy it next time. We block a wallet that has never sent anything yet appears to have, or that imitates an address its counterparty really paid; and wallets set up as poisoners through known contracts.
• Where its money came fromWhether its first funds came directly from a sanctioned address or a mixer.
• Its historyHow old it is and how much it has been used: a brand-new or barely used wallet is worth knowing about before a large payment.

For a token's contract, the answer says so and points to the token check, which is the one that tells you whether it is safe to buy.

The wallet facts in the answer

Beside the usual fields, a wallet gets wallet, and every answer says what kind of address it is:

• address_typewallet, delegated_wallet (a wallet running contract code under EIP-7702), contract or unknown.
• walletTransactions it has sent, when it was first seen, and its age in days. null where it is not known.