What is Ethereum zkAPI? A zero-knowledge proof is not a payment authorization

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What is Ethereum zkAPI? A zero-knowledge proof is not a payment authorization On October 1, 2026, the Ethereum Foundation and the Open Anonymity Project launched zkAPI — live on Ethereum mainnet. Deposit ETH or USDC into a vault, sign a zero-knowledge proof, receive a temporary API key with a predetermined spending cap, and pay for AI models and metered APIs without revealing who you are. "Every AI API call today carries an identity," the announcement post said. "Your API key points to an account, the account to a payment method, and every prompt you send joins the record attached to both.

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