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Ethereum Foundation and OA Launch zkAPI for Private AI Payment

zkAPI keeps prompts awayy from payment servers, but AI providers can read submitted content and may connect sessions through repeated details.

Wayne JonesCryptoPotato · October 2, 2026 · 13h ago

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Key points

  • The Ethereum Foundation and Open Anonymity Project launched zkAPI, a zero-knowledge protocol on Ethereum mainnet letting users pay for AI and other APIs without linking identity.
  • Users deposit ETH into the ZkAPIVault contract, generate zero-knowledge proofs of sufficient funds, and receive a capped API key, with nullifiers preventing double-spending.
  • The article notes zkAPI hides payment links but not prompts, IP addresses or timing patterns, and developers suggest using Tor with fresh circuits per session.

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