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Sign a message with any Ethereum address (EOA) — nothing goes on-chain, no gas, no network switch. Smart-contract wallets such as Safe aren't supported yet.

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New accounts get 30,000,000 CU sign-up credits (refilled up to 30,000,000 CU every 30 days); once they run out, requests return HTTP 402.

Every month you get 1 reset chance to refill your balance to 30,000,000 CU.